The development of catalysts that can efficiently separate both bulk and interface charges is crucial for conversion and utilization of solar energy.In this study,a homo-heterojunction was fabricated by combin-ing twi...The development of catalysts that can efficiently separate both bulk and interface charges is crucial for conversion and utilization of solar energy.In this study,a homo-heterojunction was fabricated by combin-ing twinned-Cd_(0.5)Zn_(0.5)S(T-CZS)and Ni_(3)(PO_(4))_(2)with crystalline water(NiPO)using a solvent evaporation strategy for efficient photocatalytic H_(2)evolution in water containing degradable plastics.The bulk phase of T-CZS consists of wurtzite Cd_(0.5)Zn_(0.5)S(WZ-CZS)and zinc blende Cd_(0.5)Zn_(0.5)S(ZB-CZS),they exhibit a slight difference in energy range and can form S-scheme homojunction,while NiPO and T-CZS constitute the S-scheme heterojunction,they work together to promote the separation of bulk and interface charges.This double S-scheme homo-heterojunction achieves a hydrogen evolution rate(rH_(2))of 73.2 mmol h−1 g−1 over 8%NiPO/T-CZS in a solution mainly composed of polylactic acid(PLA),which exhibits an in-crease by factors of 243.0 and 4.5 compared to NiPO and T-CZS individually.Meanwhile,PLA plastics are degraded into organic chemicals including formic acid,acetic acid,and pyruvic acid.Moreover,NiPO ex-hibits(localized surface plasmon resonance)LSPR effect,which can broaden the light absorption range of the system,reduce the H_(2)evolution overpotential,and enhance electron utilization efficiency.Based on electron capture experiments and band theory analysis,the introducing of plastic as an electron donor further accelerates the evolution process of H_(2),while alkaline sodium hydroxide(NaOH)solution pro-motes the PLA dissociation and enhances oxidation driving force,indirectly promoting the H_(2)evolution kinetics of this system.The present research offers prospective solutions for engineering solar-powered H_(2)evolution to tackle energy challenges.展开更多
Available online Further oxidation of NH3produced via photocatalytic N_(2)fixation represents a promising strategy to enhance the economic value of N_(2)fixation.This work employs first-principles density functional t...Available online Further oxidation of NH3produced via photocatalytic N_(2)fixation represents a promising strategy to enhance the economic value of N_(2)fixation.This work employs first-principles density functional theory(DFT)calculations to demonstrate that incorporating Co into Ni O improves both N_(2)adsorption and activation as well as M-N electron exchange intensity.Guided by these predictions,a novel Co single-atom photocatalyst supported by nanoconfined Ni O@C nanosheets was synthesized using a direct metal atomization method,achieving high HNO_(3)production(60.54%).NH_(4)^(+)and NO_(3)^(-)production rates during N_(2)photofixation reached 67.97μmol g_(cat)^(-1)h^(-1)and 104.28μmol g_(cat)^(-1)h^(-1),respectively.The overall N_(2)→NH_(3)→HNO_(3)photofixation pathway was validated through in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)and^(15)N isotopic labeling.Mechanistic studies reveal that Co single-atom introduction serves as an electron trap,enhancing photogenerated electron accumulation with a five-fold increase in carrier density compared to Ni O@C,as observed via in-situ X-ray photoelectron spectroscopy(XPS).This synergistic effect between electron traps and N2adsorption/activation sites at Co single-atom centers supports rapid N_(2)reduction kinetics.Additionally,nanoconfined ink-bottle pores in the carbon layer impede NH_(3)desorption,further boosting NO_(3)-production.This work offers a comprehensive approach to optimizing N_(2)photofixation through electron regulation and surface reaction kinetics.展开更多
Effective separation of bulk phase and surface charges is crucial for maximizing charge utilization in the process of photocatalytic energy conversion.In this study,SnS_(2) nanoflowers and twinned Mn_(0.5) Cd_(0.5) S ...Effective separation of bulk phase and surface charges is crucial for maximizing charge utilization in the process of photocatalytic energy conversion.In this study,SnS_(2) nanoflowers and twinned Mn_(0.5) Cd_(0.5) S solid solution(T-MCS)nanoparticles were fabricated by a one-step solvothermal method respectively,fol-lowed by the formation of SnS_(2)/T-MCS nanohybrids through a facile physical solvent evaporation process for high-efficiency photocatalytic hydrogen(H_(2))production.The T-MCS crystal structure consists of alter-nating wurtzite Mn_(0.5) Cd_(0.5) S(WZ-MCS)and zinc blende Mn_(0.5) Cd_(0.5) S(ZB-MCS),forming a twin structure within the semiconductor.The charge migration mechanism between WZ-MCS and ZB-MCS follows the S-scheme pathway owing to slight differences in energy levels within their respective crystal structures,resulting in exceptional bulk phase charge separation capacity of T-MCS.Additionally,SnS_(2) enhances the electrochemical performance of the catalysts by providing more active sites,reducing charge transfer re-sistance and H_(2) production overpotential,thereby facilitating faster reaction kinetics.The photoelectro-chemical tests,radical trapping experiments,density functional theory(DFT),and electron paramagnetic resonance spectroscopy(EPR)confirm that the charge transfer path between SnS_(2) and T-MCS follows an S-type route that accelerates interfacial photo-induced electrons and holes separation while preserving useful charges.The synergistic impact of twinned homojunction and S-type heterojunction in 10 wt.%SnS_(2)/T-MCS composite contributes to a remarkable H_(2) production rate of 182.82 mmol h^(-1) g^(-1),which is 761.8 times higher than that achieved with SnS_(2) alone(0.24 mmol h^(-1) g^(-1)),as well as 5.8 times higher than that achieved with T-MCS alone(31.54 mmol h^(-1) g^(-1)).This study offers novel insights into design-ing highly efficient sulfide photocatalysts specifically targeting solar-driven H_(2) evolution through a dual S-scheme transfer pathway.展开更多
For the efficient harnessing of solar energy and mitigation of environmental pollution,the develop-ment and application of semiconductor photocatalysis technology is paramount.Herein,a novel SubPc-Br/CdS supramolecula...For the efficient harnessing of solar energy and mitigation of environmental pollution,the develop-ment and application of semiconductor photocatalysis technology is paramount.Herein,a novel SubPc-Br/CdS supramolecular array with an S-scheme heterojunction was synthesized through the intermolecu-larπ-stacked self-assembly of subphthalocyanine(SubPc-Br)and nanometer cadmium sulfide(CdS).This self-assembly system features a highly structured architecture and excellent stability.Experiments and ground-state differential charge calculations demonstrate that SubPc-Br and CdS form a built-in electric field during the self-assembly process,a critical factor in promoting the dissociation of electrons and holes.Additionally,this study utilized time-dependent density functional theory(TDDFT)to simulate the dynamic adsorption behavior of excited oxygen molecules on the SubPc-Br/CdS interface for the first time.The analysis of molecular charge differential density under different excited states proved that the addi-tion of SubPc-Br molecules not only improves the photocorrosion resistance of CdS in an O2 adsorption environment but also enhances the production of advanced reactive oxygen species under the synergistic action of h+and·O2-.When subjected to visible light,the degradation efficiency of minocycline(MC)achieved 96.8%within 60 min and maintained 80.3%after 5 cycles.In summary,this study highlights the feasibility of creating advanced S-scheme heterojunction photocatalysts through the strategic incor-poration of organic supramolecules with semiconductor catalysts.展开更多
The design and construction of heterojunction photocatalysts,which possess a staggered energy band structure and appropriate interfacial contact,is an effective way to achieve outstanding photocatalytic performance.In...The design and construction of heterojunction photocatalysts,which possess a staggered energy band structure and appropriate interfacial contact,is an effective way to achieve outstanding photocatalytic performance.In this study,2D/2D BiOBr/g‐C_(3)N_(4)heterojunctions were successfully obtained by a convenient in situ self‐assembly route.Under simulated sunlight irradiation,99%of RhB(10 mg·L–1,100 mL)was efficiently degraded by 1.5‐BiOBr/g‐C_(3)N_(4)within 30 min,which is better than the performance of both BiOBr and g‐C_(3)N_(4),and it has superior stability.In addition,the composite also exhibits enhanced photocatalytic activity for H2 production.The enhanced activity can be attributed to the intimate interface contact,the larger surface area,and the highly efficient separation of photoinduced electron–hole pairs.Based on the experimental results,a novel S‐scheme model was proposed to illuminate the transfer process of charge carriers.This study presents a simple way to develop novel step‐scheme photocatalysts for environmental and related applications.展开更多
Two-dimensional mesoporous ultrathin Cd0.5Zn0.5S nanosheets with a thickness of~1.5 nm were fabricated using a multistep chemical transformation strategy involving inorganic–organic hybrid ZnS-ethylenediamine(denoted...Two-dimensional mesoporous ultrathin Cd0.5Zn0.5S nanosheets with a thickness of~1.5 nm were fabricated using a multistep chemical transformation strategy involving inorganic–organic hybrid ZnS-ethylenediamine(denoted as ZnS(en)0.5)as a hard template.Inorganic–organic hybrid ZnS(en)0.5,Cd0.5Zn0.5S(en)x,and Cd0.5Zn0.5S nanosheets were sequentially fabricated,and their transformation processes were analyzed in detail.The fabricated Cd0.5Zn0.5S nanosheets exhibited high photocatalytic hydrogen evolution reaction activity in the presence of a sacrificial agent.The Cd0.5Zn0.5S nanosheets exhibited remarkably high H2 production activity of~1395μmol∙h^−1∙g^−1 in pure water with no co-catalyst,which is the highest value reported thus far for bare photocatalysts,to the best of our knowledge.The high activity of these nanosheets is attributed to their distinct nanostructure(e.g.,short transfer distance of photoinduced charge carriers,large number of unsaturated surface atoms,and large surface area).Moreover,ternary NiCo2S4 nanoparticles were employed to facilitate the charge separation and enhance the surface kinetics of H2 evolution.The H2 production rate reached~62.2 and~2436μmol∙h^−1∙g^−1 in triethanolamine and pure water,respectively,over the NiCo2S4/Cd0.5Zn0.5S heterojunctions.The result indicated that the Schottky junction was critical to the enhanced activity.The proposed method can be used for fabricating other highly efficient CdZnS-based photocatalysts for solar-energy conversion or other applications.展开更多
In this work,a novel plasmon-assisted UV-vis-NIR-driven W_(18)O_(49)/Cd_(0.5)Zn_(0.5)S heterostructure photocatalyst was obtained by a facile ultrasonic-assisted electrostatic self-assembly strategy.The hybrid exhibit...In this work,a novel plasmon-assisted UV-vis-NIR-driven W_(18)O_(49)/Cd_(0.5)Zn_(0.5)S heterostructure photocatalyst was obtained by a facile ultrasonic-assisted electrostatic self-assembly strategy.The hybrid exhibits extraordinary H2 evolution activity of 147.7 mmol·g^(-1)·h^(-1) at room temperature due to the efficient charge separation and expanded light absorption.Our investigation shows that the unique Step-scheme(S-scheme)charge transfer and the‘hot electron’injection are both responsible for the extraordinary H2 evolution process,depending on the wavelength of the incident light.Moreover,by accelerating the surface reaction kinetics,the activity can be further elevated to 306.1 mmol·g^(-1)·h^(-1),accompanied by a high apparent quantum yield of 45.3% at 365±7.5 nm.This work provides us a potential strategy for the highly efficient conversion of the solar energy by elaborately combining a nonstoichiometric ratio plasmonic material with an appropriate active photocatalyst.展开更多
Ag nanoparticles (NPs) were deposited on the surface of g-C3N4 (CN) by an in situ calcination method. NiS was successfully loaded onto the composites by a hydrothermal method. The results showed that the 10 wt%-NiS/1....Ag nanoparticles (NPs) were deposited on the surface of g-C3N4 (CN) by an in situ calcination method. NiS was successfully loaded onto the composites by a hydrothermal method. The results showed that the 10 wt%-NiS/1.0 wt%-Ag/CN composite exhibits excellent photocatalytic H2 generation performance under solar-light irradiation. An H2 production rate of 9.728 mmol·g^-1·h^-1 was achieved, which is 10.82-, 3.45-, and 2.77-times higher than those of pure g-C3N4, 10 wt%-NiS/CN, and 1.0 wt%-Ag/CN composites, respectively. This enhanced photocatalytic H2 generation can be ascribed to the co-decoration of Ag and NiS on the surface of g-C3N4, which efficiently improves light harvesting capacity, photogenerated charge carrier separation, and photocatalytic H2 production kinetics. Thus, this study demonstrates an effective strategy for constructing excellent g-C3N4-related composite photocatalysts for H2 production by using different co-catalysts.展开更多
Effective bulk phase and surface charge separation is critical for charge utilization during the photo-catalytic energy conversion process.In this work,the ternary Ni_(2)P-NiS/twinned Mn_(0.5)Cd_(0.5)S(T-MCS)nanohybri...Effective bulk phase and surface charge separation is critical for charge utilization during the photo-catalytic energy conversion process.In this work,the ternary Ni_(2)P-NiS/twinned Mn_(0.5)Cd_(0.5)S(T-MCS)nanohybrids were successfully constructed via combining Ni_(2)P-NiS with T-MCS solid solution for visible light photocatalytic H_(2)evolution.T-MCS is composed of zinc blende Mn_(0.5)Cd_(0.5)S(ZB-MCS)and wurtzite Mn_(0.5)Cd_(0.5)S(WZ-MCS)and those two alternatively arranged crystal phases endow T-MCS with excellent bulk phase charge separation performance for the slight energy level difference between ZB-MCS and WZ-MCS.S-scheme carriers transfer route between NiS and T-MCS can accelerate the interfacial charge separation and retain the active electrons and holes,meanwhile,co-catalyst Ni_(2)P as electron receiver and proton reduction center can further optimize the H_(2)evolution reaction kinetics based on the surface Schottky barrier effect.The above-formed homo-heterojunctions can establish multiple charge transfer channels in the bulk phase of T-MCS and interface of T-MCS and Ni_(2)P-NiS.Under the synergistic effect of twinned homojunction,S-scheme heterojunction,and Schottky barrier,the ternary Ni_(2)P-NiS/T-MCS com-posite manifested an H_(2)production rate of 122.5 mmol h^(-1)g^(-1),which was 1.33,1.24,and 2.58 times higher than those of the NiS/T-MCS(92.4 mmol h^(-1)g^(-1)),Ni_(2)P/T-MCS(98.4 mmol h^(-1)g^(-1)),and T-MCS(47.5 mmol h^(-1)g^(-1)),respectively.This work demonstrates a promising strategy to develop efficient sul-fides photocatalyst toward targeted solar-driven H_(2)evolution through homo-heterojunction engineering.展开更多
Constructing of heterojunction was identified as a feasible way to improve photocatalytic activity of pho-tocatalyst.In this work,a n-p type Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction was successfully prepared for ...Constructing of heterojunction was identified as a feasible way to improve photocatalytic activity of pho-tocatalyst.In this work,a n-p type Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction was successfully prepared for organic pollutants degradation.This Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction exhibited much higher pho-tocatalytic activity towards Rhodamine B(92.24%,expose to visible light for 60 min),norfloxacin(81.73%,expose to visible light for 90 min)and levofloxacin(87.46%,expose to visible light for 90 min)than pure Bi_(2)WO_(6)and pure AgInS_(2).Toxicity analysis indicated the low environmental toxicity of Rhodamine B degradation intermediates for Rye seeds and Sudangrass seeds germination and growth.Mechanism study displayed that AgInS_(2)and Bi_(2)WO_(6)work as the primary photocatalyst to form·O_(2)−and ·OH,respectively.The improved photocatalytic activity of the Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction was due to the im-proved light response range and intensified carrier separation capability.Additionally,a S-scheme charge transfer mechanism including multiple charge transfer channels was proposed.This work could provide an effective strategy for organic pollutants degradation in wastewater.展开更多
The development of an efficient artificial H_(2)O_(2) photosynthesis system is a challenging work using H_(2)O and O_(2) as starting materials.Herein,3D In_(2.77)S_(4) nanoflower precursor was in-situ deposited on K^(...The development of an efficient artificial H_(2)O_(2) photosynthesis system is a challenging work using H_(2)O and O_(2) as starting materials.Herein,3D In_(2.77)S_(4) nanoflower precursor was in-situ deposited on K^(+)-doped g-C_(3)N_(4)(KCN)nanosheets using a solvothermal method,then In_(2.77)S_(4)/KCN(IS/KCN)het-erojunction with an intimate interface was obtained after a calcination process.The investigation shows that the photocatalytic H_(2)O_(2) production rate of 50IS/KCN can reach up to 1.36 mmol g^(-1)h^(-1)without any sacrificial reagents under visible light irradiation,which is 9.2 times and 4.1 times higher than that of KCN and In_(2.77)S_(4)/respectively.The enhanced activity of the above composite can be mainly attributed to the S-scheme charge transfer route between KCN and In_(2.77)S_(4) according to density functional theory calculations,electron paramagnetic resonance and free radical capture tests,leading to an expanded light response range and rapid charge separation at their interface,as well as preserving the active electrons and holes for H_(2)O_(2) production.Besides,the unique 3D nanostructure and surface hydrophobicity of IS/KCN facilitate the diffusion and transportation of O_(2) around the active centers,the energy barriers of O_(2) protonation and H_(2)O_(2) desorption steps are ef-fectively reduced over the composite.In addition,this system also exhibits excellent light harvesting ability and stability.This work provides a potential strategy to explore a sustainable H_(2)O_(2) photo-synthesis pathway through the design of heterojunctions with intimate interfaces and desired reac-tion thermodynamics and kinetics.展开更多
Nowadays,energy and environmental problems are becoming increasingly prominent in society,the de-velopment of clean and environmentally friendly energy is in line with the construction of ecological civilization and e...Nowadays,energy and environmental problems are becoming increasingly prominent in society,the de-velopment of clean and environmentally friendly energy is in line with the construction of ecological civilization and energy,which have attracted the attention of many researchers over the past decades.Narrow band gap semiconductor Sb_(2)S_(3)is widely used in the area of solar cells because of its high light absorption coefficient and suitable bandgap width.However,numerous deep-level defects provide plen-tiful photogenerated carrier recombination sites,which restricts the improvement of photoelectrochem-ical properties seriously.In this work,S-scheme Sb_(2)S_(3)@CdSe_(x)S_(1-x)core-shell quasi-one-dimensional het-erojunction photoanodes were prepared on the FTO substrate by a two-step vapor transport deposition(VTD)method,chemical bath deposition(CBD)and in-situ selenization method.The results showed that CdSe_(x)S_(1-x)nanoparticles(NPs)were tightly coated on the Sb_(2)S_(3)nanorods(NRs).The photocurrent den-sity of the Sb_(2)S_(3)@CdSe_(x)S_(1-x)photoanodes was 1.61 mA cm^(-2)under 1.23 VRHE.Compared with the Sb_(2)S_(3)photoanodes(0.61 mA cm^(-2)),Sb_(2)S_(3)@CdSe_(x)S_(1-x)photoanodes obtained a 2.64-fold improvement,and the dark current was effectively reduced.It showed excellent stability and fast photocurrent response in a 600 s optical stability test.It was concluded that:(1)The charge transfer mechanism of the S-scheme can avoid the problem of high recombination rate of photogenerated charge carriers due to the defects of Sb_(2)S_(3)effectively,and realized spatial separation of photogenerated carriers.(2)The[hk 1]oriented Sb_(2)S_(3)NRs and the formed quasi-one-dimensional heterostructures promote efficient carrier transport.(3)The introduction of Se effectively regulated the band structure of CdS,slowed down the photocorrosion of S,and improved the stability of the photoelectrodes significantly.展开更多
In this work,a novel biochar decorated Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)S-scheme heterojunction was successfully prepared for Norfloxacin(NOR)degradation,and it was found that the 5%-Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)/C hete...In this work,a novel biochar decorated Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)S-scheme heterojunction was successfully prepared for Norfloxacin(NOR)degradation,and it was found that the 5%-Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)/C heterojunction exhibited the excellent photocatalytic degradation activity toward NOR,degrading 92.5%of NOR within 72 min under visible light irradiation.The effects of pH,dosage,and concentration of the NOR on the photocatalytic activity were also systematically investigated.The mechanism studies revealed that the active species like hole(h+),hydroxyl radical(·OH),and superoxide radical(·O2-)play a predominant role in the NOR degradation,and the enhanced removal rate of Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)/C heterojunction can be attributed to the synergistic effect of adsorption and photocatalytic process.In addition,an S-scheme transfer channel in the interface of the Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)/C heterojunction is proposed,which can effectively improve the separation of the photogenerated carriers and enhance the photocatalytic performance.This research provides inspiration for designing S-scheme heterojunction for wastewater treatment.展开更多
In this work,bimetallic NiCoP nanoparticles(NPs)were firstly prepared by a solvothermal method using red phosphorus(RP)as P source,and it was combined with RP nanosheets via a physical grinding process.Investigation i...In this work,bimetallic NiCoP nanoparticles(NPs)were firstly prepared by a solvothermal method using red phosphorus(RP)as P source,and it was combined with RP nanosheets via a physical grinding process.Investigation indicates that NiCoP has better charge transfer ability and faster H_(2)releasing kinetics than the corresponding single metal phosphides alone.6 wt%NiCoP/RP exhibits an excellent H_(2)evolution activity in 20 vol.%triethanol-amine/water solution under a 300W Xe-lamp irradiation,and the corresponding H_(2)production rate is 1535.6μmol·g^(-1)·h^(-1),which is 7.4,3.2 and 2.6 times higher than those of pure RP,6 wt%Co_(2)P/RP and 6 wt%Ni_(2)P/RP,respectively.In addition,we demonstrate that K_(2)HPO_(4)can further enhance the H_(2)evolution kinetics by inducing a new H^(+)reduction path,when appropriate K_(2)HPO_(4)is introduced into the reaction solution.The H_(2)production rate of 6 wt%NiCoP/RP is boosted from 1535.6 to 2793.9μmol·g^(-1)·h^(-1) due to the easier combination between H^(+)and electrons with the assistance of HPO_(4)^(2-).It is 13.4 times higher than that of pure RP.This work demonstrates that bimetallic phosphides with suitable electrolytes can greatly enhance the photocatalytic H_(2)evolution efficiency.展开更多
Solar energy is the most important clean and renewable energy in the world.However,the unpredictability,seasonal variation day and night,uneven distribution and low energy density limit its practical application.Photo...Solar energy is the most important clean and renewable energy in the world.However,the unpredictability,seasonal variation day and night,uneven distribution and low energy density limit its practical application.Photocatalysis technology has a very broad application prospect in solving energy and environmental problems.展开更多
硒化锑(Sb_(2)Se_(3))属于窄带隙半导体材料,具有良好的光吸收特性,已逐渐应用于光电催化领域.独特的一维(Sb_(4)Se_(6))_(n)带状结构单元连接方式,使其载流子传输具有高度各向异性.本文通过气相输运沉积法和原位水热法成功构建了还原...硒化锑(Sb_(2)Se_(3))属于窄带隙半导体材料,具有良好的光吸收特性,已逐渐应用于光电催化领域.独特的一维(Sb_(4)Se_(6))_(n)带状结构单元连接方式,使其载流子传输具有高度各向异性.本文通过气相输运沉积法和原位水热法成功构建了还原氧化石墨烯(rGO)修饰的准一维Sb_(2)Se_(3)@In_(2)S_(3)光陷阱异质结.研究结果表明,在rGO空间限域效应下,原位生长的非层状In_(2)S_(3)纳米片厚度从30 nm减小到10 nm,显著增加了光电极的电化学活性比表面积,进一步增强了光陷阱纳米结构对光的捕获能力.rGO和超薄In_(2)S_(3)纳米片共同修饰的准一维毛刷状Sb_(2)Se_(3)@In_(2)S_(3)-rGO纳米棒光电极在0 V(相对于可逆氢电极)的外加偏压下,光电流密度可达1.169 m A cm^(-2),约是Sb_(2)Se_(3)@In_(2)S_(3)和单体Sb_(2)Se_(3)的2倍和16倍,且稳定性良好,在中性条件下平均产氢速率为16.59μmol cm^(-2)h^(-1).实验结果和理论计算均表明,Ⅱ型异质结电荷传输方式是其光电化学增强的物理机制.以上工作为设计基于rGO修饰的复合光电极用于光电化学领域的研究提供了崭新的思路.展开更多
基金financially supported by The Local Science and Development Fund Project Guided by the Central Govern-ment(No.24ZYQM001)the National Natural Science Foundation of China(Nos.22378326,11974276,and22078261)+6 种基金the Natural Science Basic Research Program of Shaanxi Province(No.2023-JC-YB-115)the Shaanxi Key Science and Technology Innovation Team Project(No.2022TD-33)the Qin Chuangyuan project of Shaanxi Province(No.QCYRCXM2022-213)the Basic Science Re-search Program of Shaanxi Basic Sciences Institute(Chemistry,Bi-ology,No.23JHQ081)the Key Research and Development Program of Shaanxi Province(No.2024GX-YBXM-449)the Initial Scientific Research Fund of Northwest University(S.Tao),Excellent Doctoral Dissertation Cultivation Program at Northwestern University(No.YB2024012)the Program of China Scholarship Council(No.202406970056)。
文摘The development of catalysts that can efficiently separate both bulk and interface charges is crucial for conversion and utilization of solar energy.In this study,a homo-heterojunction was fabricated by combin-ing twinned-Cd_(0.5)Zn_(0.5)S(T-CZS)and Ni_(3)(PO_(4))_(2)with crystalline water(NiPO)using a solvent evaporation strategy for efficient photocatalytic H_(2)evolution in water containing degradable plastics.The bulk phase of T-CZS consists of wurtzite Cd_(0.5)Zn_(0.5)S(WZ-CZS)and zinc blende Cd_(0.5)Zn_(0.5)S(ZB-CZS),they exhibit a slight difference in energy range and can form S-scheme homojunction,while NiPO and T-CZS constitute the S-scheme heterojunction,they work together to promote the separation of bulk and interface charges.This double S-scheme homo-heterojunction achieves a hydrogen evolution rate(rH_(2))of 73.2 mmol h−1 g−1 over 8%NiPO/T-CZS in a solution mainly composed of polylactic acid(PLA),which exhibits an in-crease by factors of 243.0 and 4.5 compared to NiPO and T-CZS individually.Meanwhile,PLA plastics are degraded into organic chemicals including formic acid,acetic acid,and pyruvic acid.Moreover,NiPO ex-hibits(localized surface plasmon resonance)LSPR effect,which can broaden the light absorption range of the system,reduce the H_(2)evolution overpotential,and enhance electron utilization efficiency.Based on electron capture experiments and band theory analysis,the introducing of plastic as an electron donor further accelerates the evolution process of H_(2),while alkaline sodium hydroxide(NaOH)solution pro-motes the PLA dissociation and enhances oxidation driving force,indirectly promoting the H_(2)evolution kinetics of this system.The present research offers prospective solutions for engineering solar-powered H_(2)evolution to tackle energy challenges.
基金supported by the National Natural Science Foundation of China(No.62004143)the Key Research and Development Program of Gansu Province-Industrial Project under Grant(No.25YFGA058)+4 种基金the Key Talent Project Foundation of Gansu Province(No.2025RCXM066)the Gansu Provincial Department of Education:Industrial Support Plan Project(No.2025CYZC-005)the Key R&D Program of Hubei Province(No.2022BAA084)the Science and Technology Project of Lanzhou(No.2024-3-42)the Fundamental Research Funds for the Central Universities(No.331920240059)。
文摘Available online Further oxidation of NH3produced via photocatalytic N_(2)fixation represents a promising strategy to enhance the economic value of N_(2)fixation.This work employs first-principles density functional theory(DFT)calculations to demonstrate that incorporating Co into Ni O improves both N_(2)adsorption and activation as well as M-N electron exchange intensity.Guided by these predictions,a novel Co single-atom photocatalyst supported by nanoconfined Ni O@C nanosheets was synthesized using a direct metal atomization method,achieving high HNO_(3)production(60.54%).NH_(4)^(+)and NO_(3)^(-)production rates during N_(2)photofixation reached 67.97μmol g_(cat)^(-1)h^(-1)and 104.28μmol g_(cat)^(-1)h^(-1),respectively.The overall N_(2)→NH_(3)→HNO_(3)photofixation pathway was validated through in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)and^(15)N isotopic labeling.Mechanistic studies reveal that Co single-atom introduction serves as an electron trap,enhancing photogenerated electron accumulation with a five-fold increase in carrier density compared to Ni O@C,as observed via in-situ X-ray photoelectron spectroscopy(XPS).This synergistic effect between electron traps and N2adsorption/activation sites at Co single-atom centers supports rapid N_(2)reduction kinetics.Additionally,nanoconfined ink-bottle pores in the carbon layer impede NH_(3)desorption,further boosting NO_(3)-production.This work offers a comprehensive approach to optimizing N_(2)photofixation through electron regulation and surface reaction kinetics.
基金supported by the National Natural Science Foundation of China(Nos.22378326,11974276,and 22078261)the Northwest University Graduate Student Innovation Project(No.CX2023155)+3 种基金the Natural Science Basic Research Program of Shaanxi Province(No.2023-JC-YB-115)the Shaanxi Key Science and Technology Innovation Team Project(No.2022TD-33)Qin Chuangyuan project of Shaanxi Province(No.QCYRCXM-2022-213)The Key Research and Development Program of Shaanxi Province(No.2024GX-YBXM-449).
文摘Effective separation of bulk phase and surface charges is crucial for maximizing charge utilization in the process of photocatalytic energy conversion.In this study,SnS_(2) nanoflowers and twinned Mn_(0.5) Cd_(0.5) S solid solution(T-MCS)nanoparticles were fabricated by a one-step solvothermal method respectively,fol-lowed by the formation of SnS_(2)/T-MCS nanohybrids through a facile physical solvent evaporation process for high-efficiency photocatalytic hydrogen(H_(2))production.The T-MCS crystal structure consists of alter-nating wurtzite Mn_(0.5) Cd_(0.5) S(WZ-MCS)and zinc blende Mn_(0.5) Cd_(0.5) S(ZB-MCS),forming a twin structure within the semiconductor.The charge migration mechanism between WZ-MCS and ZB-MCS follows the S-scheme pathway owing to slight differences in energy levels within their respective crystal structures,resulting in exceptional bulk phase charge separation capacity of T-MCS.Additionally,SnS_(2) enhances the electrochemical performance of the catalysts by providing more active sites,reducing charge transfer re-sistance and H_(2) production overpotential,thereby facilitating faster reaction kinetics.The photoelectro-chemical tests,radical trapping experiments,density functional theory(DFT),and electron paramagnetic resonance spectroscopy(EPR)confirm that the charge transfer path between SnS_(2) and T-MCS follows an S-type route that accelerates interfacial photo-induced electrons and holes separation while preserving useful charges.The synergistic impact of twinned homojunction and S-type heterojunction in 10 wt.%SnS_(2)/T-MCS composite contributes to a remarkable H_(2) production rate of 182.82 mmol h^(-1) g^(-1),which is 761.8 times higher than that achieved with SnS_(2) alone(0.24 mmol h^(-1) g^(-1)),as well as 5.8 times higher than that achieved with T-MCS alone(31.54 mmol h^(-1) g^(-1)).This study offers novel insights into design-ing highly efficient sulfide photocatalysts specifically targeting solar-driven H_(2) evolution through a dual S-scheme transfer pathway.
基金the National Natural Science Foun-dation of China(No.22278334)。
文摘For the efficient harnessing of solar energy and mitigation of environmental pollution,the develop-ment and application of semiconductor photocatalysis technology is paramount.Herein,a novel SubPc-Br/CdS supramolecular array with an S-scheme heterojunction was synthesized through the intermolecu-larπ-stacked self-assembly of subphthalocyanine(SubPc-Br)and nanometer cadmium sulfide(CdS).This self-assembly system features a highly structured architecture and excellent stability.Experiments and ground-state differential charge calculations demonstrate that SubPc-Br and CdS form a built-in electric field during the self-assembly process,a critical factor in promoting the dissociation of electrons and holes.Additionally,this study utilized time-dependent density functional theory(TDDFT)to simulate the dynamic adsorption behavior of excited oxygen molecules on the SubPc-Br/CdS interface for the first time.The analysis of molecular charge differential density under different excited states proved that the addi-tion of SubPc-Br molecules not only improves the photocorrosion resistance of CdS in an O2 adsorption environment but also enhances the production of advanced reactive oxygen species under the synergistic action of h+and·O2-.When subjected to visible light,the degradation efficiency of minocycline(MC)achieved 96.8%within 60 min and maintained 80.3%after 5 cycles.In summary,this study highlights the feasibility of creating advanced S-scheme heterojunction photocatalysts through the strategic incor-poration of organic supramolecules with semiconductor catalysts.
文摘The design and construction of heterojunction photocatalysts,which possess a staggered energy band structure and appropriate interfacial contact,is an effective way to achieve outstanding photocatalytic performance.In this study,2D/2D BiOBr/g‐C_(3)N_(4)heterojunctions were successfully obtained by a convenient in situ self‐assembly route.Under simulated sunlight irradiation,99%of RhB(10 mg·L–1,100 mL)was efficiently degraded by 1.5‐BiOBr/g‐C_(3)N_(4)within 30 min,which is better than the performance of both BiOBr and g‐C_(3)N_(4),and it has superior stability.In addition,the composite also exhibits enhanced photocatalytic activity for H2 production.The enhanced activity can be attributed to the intimate interface contact,the larger surface area,and the highly efficient separation of photoinduced electron–hole pairs.Based on the experimental results,a novel S‐scheme model was proposed to illuminate the transfer process of charge carriers.This study presents a simple way to develop novel step‐scheme photocatalysts for environmental and related applications.
文摘Two-dimensional mesoporous ultrathin Cd0.5Zn0.5S nanosheets with a thickness of~1.5 nm were fabricated using a multistep chemical transformation strategy involving inorganic–organic hybrid ZnS-ethylenediamine(denoted as ZnS(en)0.5)as a hard template.Inorganic–organic hybrid ZnS(en)0.5,Cd0.5Zn0.5S(en)x,and Cd0.5Zn0.5S nanosheets were sequentially fabricated,and their transformation processes were analyzed in detail.The fabricated Cd0.5Zn0.5S nanosheets exhibited high photocatalytic hydrogen evolution reaction activity in the presence of a sacrificial agent.The Cd0.5Zn0.5S nanosheets exhibited remarkably high H2 production activity of~1395μmol∙h^−1∙g^−1 in pure water with no co-catalyst,which is the highest value reported thus far for bare photocatalysts,to the best of our knowledge.The high activity of these nanosheets is attributed to their distinct nanostructure(e.g.,short transfer distance of photoinduced charge carriers,large number of unsaturated surface atoms,and large surface area).Moreover,ternary NiCo2S4 nanoparticles were employed to facilitate the charge separation and enhance the surface kinetics of H2 evolution.The H2 production rate reached~62.2 and~2436μmol∙h^−1∙g^−1 in triethanolamine and pure water,respectively,over the NiCo2S4/Cd0.5Zn0.5S heterojunctions.The result indicated that the Schottky junction was critical to the enhanced activity.The proposed method can be used for fabricating other highly efficient CdZnS-based photocatalysts for solar-energy conversion or other applications.
文摘In this work,a novel plasmon-assisted UV-vis-NIR-driven W_(18)O_(49)/Cd_(0.5)Zn_(0.5)S heterostructure photocatalyst was obtained by a facile ultrasonic-assisted electrostatic self-assembly strategy.The hybrid exhibits extraordinary H2 evolution activity of 147.7 mmol·g^(-1)·h^(-1) at room temperature due to the efficient charge separation and expanded light absorption.Our investigation shows that the unique Step-scheme(S-scheme)charge transfer and the‘hot electron’injection are both responsible for the extraordinary H2 evolution process,depending on the wavelength of the incident light.Moreover,by accelerating the surface reaction kinetics,the activity can be further elevated to 306.1 mmol·g^(-1)·h^(-1),accompanied by a high apparent quantum yield of 45.3% at 365±7.5 nm.This work provides us a potential strategy for the highly efficient conversion of the solar energy by elaborately combining a nonstoichiometric ratio plasmonic material with an appropriate active photocatalyst.
基金supported by the National Natural Science Foundation of China(21676213,21476183,51372201)the China Postdoctoral Science Foundation(2016M600809)the Natural Science Basic Research Plan in Shaanxi Province of China(2017JM2026)~~
文摘Ag nanoparticles (NPs) were deposited on the surface of g-C3N4 (CN) by an in situ calcination method. NiS was successfully loaded onto the composites by a hydrothermal method. The results showed that the 10 wt%-NiS/1.0 wt%-Ag/CN composite exhibits excellent photocatalytic H2 generation performance under solar-light irradiation. An H2 production rate of 9.728 mmol·g^-1·h^-1 was achieved, which is 10.82-, 3.45-, and 2.77-times higher than those of pure g-C3N4, 10 wt%-NiS/CN, and 1.0 wt%-Ag/CN composites, respectively. This enhanced photocatalytic H2 generation can be ascribed to the co-decoration of Ag and NiS on the surface of g-C3N4, which efficiently improves light harvesting capacity, photogenerated charge carrier separation, and photocatalytic H2 production kinetics. Thus, this study demonstrates an effective strategy for constructing excellent g-C3N4-related composite photocatalysts for H2 production by using different co-catalysts.
基金supported by the National Natu-ral Science Foundation of China(Nos.22078261,21676213,and 11974276)Natural Science Basic Research Program of Shaanxi(No.2023-JC-YB-115)+1 种基金Shaanxi Key Science and Technology Innovation Team Project(No.2022TD-33)National College Student Inno-vation and Entrepreneurship Training Program(No.202210697069)for the financial support of this work.
文摘Effective bulk phase and surface charge separation is critical for charge utilization during the photo-catalytic energy conversion process.In this work,the ternary Ni_(2)P-NiS/twinned Mn_(0.5)Cd_(0.5)S(T-MCS)nanohybrids were successfully constructed via combining Ni_(2)P-NiS with T-MCS solid solution for visible light photocatalytic H_(2)evolution.T-MCS is composed of zinc blende Mn_(0.5)Cd_(0.5)S(ZB-MCS)and wurtzite Mn_(0.5)Cd_(0.5)S(WZ-MCS)and those two alternatively arranged crystal phases endow T-MCS with excellent bulk phase charge separation performance for the slight energy level difference between ZB-MCS and WZ-MCS.S-scheme carriers transfer route between NiS and T-MCS can accelerate the interfacial charge separation and retain the active electrons and holes,meanwhile,co-catalyst Ni_(2)P as electron receiver and proton reduction center can further optimize the H_(2)evolution reaction kinetics based on the surface Schottky barrier effect.The above-formed homo-heterojunctions can establish multiple charge transfer channels in the bulk phase of T-MCS and interface of T-MCS and Ni_(2)P-NiS.Under the synergistic effect of twinned homojunction,S-scheme heterojunction,and Schottky barrier,the ternary Ni_(2)P-NiS/T-MCS com-posite manifested an H_(2)production rate of 122.5 mmol h^(-1)g^(-1),which was 1.33,1.24,and 2.58 times higher than those of the NiS/T-MCS(92.4 mmol h^(-1)g^(-1)),Ni_(2)P/T-MCS(98.4 mmol h^(-1)g^(-1)),and T-MCS(47.5 mmol h^(-1)g^(-1)),respectively.This work demonstrates a promising strategy to develop efficient sul-fides photocatalyst toward targeted solar-driven H_(2)evolution through homo-heterojunction engineering.
基金supported by the Specialized Research Fund of Education Department of Shaanxi Province(No.22JY015)the College Students Innovation and Entrepreneurship Plan Training Program(No.S202211396006).
文摘Constructing of heterojunction was identified as a feasible way to improve photocatalytic activity of pho-tocatalyst.In this work,a n-p type Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction was successfully prepared for organic pollutants degradation.This Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction exhibited much higher pho-tocatalytic activity towards Rhodamine B(92.24%,expose to visible light for 60 min),norfloxacin(81.73%,expose to visible light for 90 min)and levofloxacin(87.46%,expose to visible light for 90 min)than pure Bi_(2)WO_(6)and pure AgInS_(2).Toxicity analysis indicated the low environmental toxicity of Rhodamine B degradation intermediates for Rye seeds and Sudangrass seeds germination and growth.Mechanism study displayed that AgInS_(2)and Bi_(2)WO_(6)work as the primary photocatalyst to form·O_(2)−and ·OH,respectively.The improved photocatalytic activity of the Bi_(2)WO_(6)/AgInS_(2)S-scheme heterojunction was due to the im-proved light response range and intensified carrier separation capability.Additionally,a S-scheme charge transfer mechanism including multiple charge transfer channels was proposed.This work could provide an effective strategy for organic pollutants degradation in wastewater.
文摘The development of an efficient artificial H_(2)O_(2) photosynthesis system is a challenging work using H_(2)O and O_(2) as starting materials.Herein,3D In_(2.77)S_(4) nanoflower precursor was in-situ deposited on K^(+)-doped g-C_(3)N_(4)(KCN)nanosheets using a solvothermal method,then In_(2.77)S_(4)/KCN(IS/KCN)het-erojunction with an intimate interface was obtained after a calcination process.The investigation shows that the photocatalytic H_(2)O_(2) production rate of 50IS/KCN can reach up to 1.36 mmol g^(-1)h^(-1)without any sacrificial reagents under visible light irradiation,which is 9.2 times and 4.1 times higher than that of KCN and In_(2.77)S_(4)/respectively.The enhanced activity of the above composite can be mainly attributed to the S-scheme charge transfer route between KCN and In_(2.77)S_(4) according to density functional theory calculations,electron paramagnetic resonance and free radical capture tests,leading to an expanded light response range and rapid charge separation at their interface,as well as preserving the active electrons and holes for H_(2)O_(2) production.Besides,the unique 3D nanostructure and surface hydrophobicity of IS/KCN facilitate the diffusion and transportation of O_(2) around the active centers,the energy barriers of O_(2) protonation and H_(2)O_(2) desorption steps are ef-fectively reduced over the composite.In addition,this system also exhibits excellent light harvesting ability and stability.This work provides a potential strategy to explore a sustainable H_(2)O_(2) photo-synthesis pathway through the design of heterojunctions with intimate interfaces and desired reac-tion thermodynamics and kinetics.
基金supported by the National Natural Science Foun-dation of China(No.11804274)the Natural Science Foundation of Shaanxi Province(No.2023-JC-YB-139)the Open Research Fund of State Key Laboratory of Transient Optics and Photonics,Chinese Academy of Sciences(No.SKLST202211).
文摘Nowadays,energy and environmental problems are becoming increasingly prominent in society,the de-velopment of clean and environmentally friendly energy is in line with the construction of ecological civilization and energy,which have attracted the attention of many researchers over the past decades.Narrow band gap semiconductor Sb_(2)S_(3)is widely used in the area of solar cells because of its high light absorption coefficient and suitable bandgap width.However,numerous deep-level defects provide plen-tiful photogenerated carrier recombination sites,which restricts the improvement of photoelectrochem-ical properties seriously.In this work,S-scheme Sb_(2)S_(3)@CdSe_(x)S_(1-x)core-shell quasi-one-dimensional het-erojunction photoanodes were prepared on the FTO substrate by a two-step vapor transport deposition(VTD)method,chemical bath deposition(CBD)and in-situ selenization method.The results showed that CdSe_(x)S_(1-x)nanoparticles(NPs)were tightly coated on the Sb_(2)S_(3)nanorods(NRs).The photocurrent den-sity of the Sb_(2)S_(3)@CdSe_(x)S_(1-x)photoanodes was 1.61 mA cm^(-2)under 1.23 VRHE.Compared with the Sb_(2)S_(3)photoanodes(0.61 mA cm^(-2)),Sb_(2)S_(3)@CdSe_(x)S_(1-x)photoanodes obtained a 2.64-fold improvement,and the dark current was effectively reduced.It showed excellent stability and fast photocurrent response in a 600 s optical stability test.It was concluded that:(1)The charge transfer mechanism of the S-scheme can avoid the problem of high recombination rate of photogenerated charge carriers due to the defects of Sb_(2)S_(3)effectively,and realized spatial separation of photogenerated carriers.(2)The[hk 1]oriented Sb_(2)S_(3)NRs and the formed quasi-one-dimensional heterostructures promote efficient carrier transport.(3)The introduction of Se effectively regulated the band structure of CdS,slowed down the photocorrosion of S,and improved the stability of the photoelectrodes significantly.
基金supported by the Natural Science Foundation of Shaanxi Province(No.2023-JC-QN-0976)the Shaanxi University of Chinese Medicine(No.2021GP28)+2 种基金the higher-level talent project of Shaanxi University of Chinese Medicine(No.303-17102032018)the Sci-Tech Innovation Talent System Construction Program of Shaanxi University of Chinese Medicine(No.303/173000323008)the Education Department of Shaanxi Province(CN)(No.21JK0611).
文摘In this work,a novel biochar decorated Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)S-scheme heterojunction was successfully prepared for Norfloxacin(NOR)degradation,and it was found that the 5%-Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)/C heterojunction exhibited the excellent photocatalytic degradation activity toward NOR,degrading 92.5%of NOR within 72 min under visible light irradiation.The effects of pH,dosage,and concentration of the NOR on the photocatalytic activity were also systematically investigated.The mechanism studies revealed that the active species like hole(h+),hydroxyl radical(·OH),and superoxide radical(·O2-)play a predominant role in the NOR degradation,and the enhanced removal rate of Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)/C heterojunction can be attributed to the synergistic effect of adsorption and photocatalytic process.In addition,an S-scheme transfer channel in the interface of the Bi_(4)O_(5)Br_(2)/g-C_(3)N_(4)/C heterojunction is proposed,which can effectively improve the separation of the photogenerated carriers and enhance the photocatalytic performance.This research provides inspiration for designing S-scheme heterojunction for wastewater treatment.
基金supported by the National Natural Science Foundation of China(Nos.22078261,21676213,and 11974276)the Natural Science Basic Research Program of Shaanxi(No.2020JM-422)。
文摘In this work,bimetallic NiCoP nanoparticles(NPs)were firstly prepared by a solvothermal method using red phosphorus(RP)as P source,and it was combined with RP nanosheets via a physical grinding process.Investigation indicates that NiCoP has better charge transfer ability and faster H_(2)releasing kinetics than the corresponding single metal phosphides alone.6 wt%NiCoP/RP exhibits an excellent H_(2)evolution activity in 20 vol.%triethanol-amine/water solution under a 300W Xe-lamp irradiation,and the corresponding H_(2)production rate is 1535.6μmol·g^(-1)·h^(-1),which is 7.4,3.2 and 2.6 times higher than those of pure RP,6 wt%Co_(2)P/RP and 6 wt%Ni_(2)P/RP,respectively.In addition,we demonstrate that K_(2)HPO_(4)can further enhance the H_(2)evolution kinetics by inducing a new H^(+)reduction path,when appropriate K_(2)HPO_(4)is introduced into the reaction solution.The H_(2)production rate of 6 wt%NiCoP/RP is boosted from 1535.6 to 2793.9μmol·g^(-1)·h^(-1) due to the easier combination between H^(+)and electrons with the assistance of HPO_(4)^(2-).It is 13.4 times higher than that of pure RP.This work demonstrates that bimetallic phosphides with suitable electrolytes can greatly enhance the photocatalytic H_(2)evolution efficiency.
文摘Solar energy is the most important clean and renewable energy in the world.However,the unpredictability,seasonal variation day and night,uneven distribution and low energy density limit its practical application.Photocatalysis technology has a very broad application prospect in solving energy and environmental problems.
基金supported by the National Natural Science Foundation of China(11974276,11804274,and 22078261)。
文摘硒化锑(Sb_(2)Se_(3))属于窄带隙半导体材料,具有良好的光吸收特性,已逐渐应用于光电催化领域.独特的一维(Sb_(4)Se_(6))_(n)带状结构单元连接方式,使其载流子传输具有高度各向异性.本文通过气相输运沉积法和原位水热法成功构建了还原氧化石墨烯(rGO)修饰的准一维Sb_(2)Se_(3)@In_(2)S_(3)光陷阱异质结.研究结果表明,在rGO空间限域效应下,原位生长的非层状In_(2)S_(3)纳米片厚度从30 nm减小到10 nm,显著增加了光电极的电化学活性比表面积,进一步增强了光陷阱纳米结构对光的捕获能力.rGO和超薄In_(2)S_(3)纳米片共同修饰的准一维毛刷状Sb_(2)Se_(3)@In_(2)S_(3)-rGO纳米棒光电极在0 V(相对于可逆氢电极)的外加偏压下,光电流密度可达1.169 m A cm^(-2),约是Sb_(2)Se_(3)@In_(2)S_(3)和单体Sb_(2)Se_(3)的2倍和16倍,且稳定性良好,在中性条件下平均产氢速率为16.59μmol cm^(-2)h^(-1).实验结果和理论计算均表明,Ⅱ型异质结电荷传输方式是其光电化学增强的物理机制.以上工作为设计基于rGO修饰的复合光电极用于光电化学领域的研究提供了崭新的思路.
