Among the numerous transition metal catalysts,manganese-based compounds are considered as promising peroxymonosulfate(PMS)catalysts due to their low cost and environmental friendliness,such as cryptomelane manganese o...Among the numerous transition metal catalysts,manganese-based compounds are considered as promising peroxymonosulfate(PMS)catalysts due to their low cost and environmental friendliness,such as cryptomelane manganese oxide(K_(2-x)Mn_(8)O_(16):abbreviation KMnO).However,the limited catalytic performance of KMnO limits its practical application.In this work,iron-doped KMnO(Fe-KMnO)was prepared by one-step hydrothermal method to optimize its catalytic performance.Compared with KMnO/PMS system,Fe-KMnO/PMS system possessed more excellent removal efficiency of tetracycline(TC).Meanwhile,the Fe-KMnO/PMS system also exhibited good practical application potential and excellent stability.The mechanism of Fe-KMnO activation of PMS was further analyzed in detail.It was found that Fe participated in the redox of high-valent Mn,which promoted the activation of PMS.Moreover,The Fe site as an adsorption site enhanced the TC enrichment ability of the catalyst,reducing the mass transfer resistance and further enhancing the TC removal ability of Fe-KMnO/PMS system.This work not only provides an excellent PMS catalyst,but also offers new insights into the mechanism of PMS activation by bimetallic manganese-based catalysts.展开更多
Iron-doped titania nanoparticles exhibit a higher photocatalytic activity than pure TiO_2 for the degradation of nitrite. The optimum Fe-doped content in terms of activity is approximately 0.5%. The increase in photoa...Iron-doped titania nanoparticles exhibit a higher photocatalytic activity than pure TiO_2 for the degradation of nitrite. The optimum Fe-doped content in terms of activity is approximately 0.5%. The increase in photoactivity is probably due to the higher adsorption and the inhibition of electron-hole recombination. The photocatalytic oxidation reaction of nitrite over the Fe-doped TiO_2 catalyst follows zero-order kinetics, which is different from that over pure TiO_2. The reaction rate decreases linearly with the increase of the pH of the solution.展开更多
Thispaperisconcerned withthe preparation ofcerium doped yttrium iron garnet which areknown to be an oxide withlarge magneto opticaleffect. Usingtheimproved flux method wesuccessfully grew the bulksinglecrystalsofiron...Thispaperisconcerned withthe preparation ofcerium doped yttrium iron garnet which areknown to be an oxide withlarge magneto opticaleffect. Usingtheimproved flux method wesuccessfully grew the bulksinglecrystalsofiron garnet doped by Ce 3 + ions with maximum substitution upto0 349. Here weinvestigatedthedifferentcomposition ofsolution for maxi mum Ce3 + substitution. Thespectra ofthe Faraday rotation andtheoptical absorption were measured inthenearinfrared region fordifferentCe3 + ionsdopediron garnets. The Cesub stitution prominentlyenhancesthe Faradayeffect,andthe Yb and Euionssubstitutefor Yinthe dodecahedralsitesof YIGcanincreasetheconcentration of Ce3 + ions, depresstheforma tion of nonmagnetic Ce4 + ionsbythechargecompensation.展开更多
We report an iron covalent doping approach capable of effectively facilitating the hydrogen evolution reaction(HER)activity of tungsten boride(WB_(2)).The results demonstrated that Fe-doped WB_(2)(Fe-WB_(2))can delive...We report an iron covalent doping approach capable of effectively facilitating the hydrogen evolution reaction(HER)activity of tungsten boride(WB_(2)).The results demonstrated that Fe-doped WB_(2)(Fe-WB_(2))can deliver high current densities of 10,100 and 200 mA cm^(−2)at low HER overpotentials of 68,265 and 320 mV in 0.5 M H_(2)SO_(4),respectively.The theoretical calculations unveiled that Fe doping provides highefficiency HER activity sites,namely,Fe sites in Fe-WB_(2)(001)with the lowest H^(*)adsorption free energy value of 0.324 eV and the lowest thermodynamic limiting potential of−1.102 V.Additionally,it was found that Fe-WB_(2)is also electrocatalytically active toward the nitrogen reduction reaction(NRR),with an NH_(3)yield rate of 35.5μg h^(−1)mg^(−1)at−0.15 V(vs.RHE)in 0.05 M H_(2)SO_(4).This is ascribed to Fe doping in WB_(2)(001)decreasing the reaction free energy of the first hydrogenation reaction of the NRR from 0.837 to 0.732 eV and thus boosting the NRR activity of W sites,but the NRR selectivity is lower(faradaic efficiency of 0.78%)due to the superior HER of Fe-WB_(2).展开更多
The electrochemical nitrogen reduction reaction(NRR)is an environmentally friendly and sustainable approach for NH_(3)synthesis at mild pressure and temperature,but the implementation depends on efficient electrocatal...The electrochemical nitrogen reduction reaction(NRR)is an environmentally friendly and sustainable approach for NH_(3)synthesis at mild pressure and temperature,but the implementation depends on efficient electrocatalysts.Herein,iron-doped ceria multishelled hollow microspheres are explored as an efficient and robust electrocatalyst for the NRR in 0.1 M Na_(2)SO_(4),achieving a high NH_(3)yield of 34.79μg h^(-1)mg_(cat)^(-1)with a considerable faradaic efficiency of 36.66%at-0.4V versus reversible hydrogen electrode(RHE),surpassing the pure ceria catalyst.展开更多
Hydrogen production via electrocatalytic water splitting is an efficient strategy to achieve carbon neutrality.However,the slow reaction kinetics of the oxygen evolution reaction(OER)hinders its large-scale industrial...Hydrogen production via electrocatalytic water splitting is an efficient strategy to achieve carbon neutrality.However,the slow reaction kinetics of the oxygen evolution reaction(OER)hinders its large-scale industrial application.Therefore,it is crucial to construct efficient,stable,and scalable OER electrocatalysts.This work used a two-step hydrothermal method to prepare cobalt and iron dual-doped NiS_(2) nanosheet arrays(Co,Fe–NiS_(2))on nickel foam.Theoretical and experimental studies demonstrate that the introduction of Co and Fe can modify the space charge redistribution of NiS_(2),optimizing the Gibbs free energy of the OER intermediate and accelerating water splitting kinetics.The catalyst Co,Fe–NiS_(2) exhibits excellent OER performance in alkaline media,achieving a large current density of 500 mA cm^(−2) at an overpotential of only 242 mV due to the synergistic effect of the two dopants.It can maintain its durability for 100 hours at 700 mA cm^(−2) without significant degradation.This study offers valuable insights into the impact of cation dual-doping modulation on catalytic activity and presents a possible pathway for effective industrial water splitting.展开更多
Ordered mesoporous Fe/TiO2 was prepared by an evaporation-induced self-assembly method. The iron ions were in situ embedded in the pore wall of the TiO2 framework. The catalyst has excellent light-assisted Fenton cata...Ordered mesoporous Fe/TiO2 was prepared by an evaporation-induced self-assembly method. The iron ions were in situ embedded in the pore wall of the TiO2 framework. The catalyst has excellent light-assisted Fenton catalytic performance under UV and visible light irradiation. X-ray diffraction and transmission electron microscopy results showed that the TiO2 samples have an ordered two-dimensional hexagonal pore structure and an anatase phase structure with high crystallinity. The ordered pore structure of the TiO2 photocatalyst with a large specific surface area is beneficial to mass transfer and light harvesting. Furthermore, iron ions can be controlled by embedding them into the TiO2 framework to prevent iron ion loss and inactivation. After five cycles, the reaction rate of the ordered mesoporous Fe/TiO2 remained unchanged, indicating that the material has stable performance and broad application prospects for the purification of environmental pollutants.展开更多
The development of porous metal phosphides with abundant active sites is of great importance for efficient electrocatalytic water splitting.In this work,three-dimensional(3D)-ordered mesoporous irondoped cobalt phosph...The development of porous metal phosphides with abundant active sites is of great importance for efficient electrocatalytic water splitting.In this work,three-dimensional(3D)-ordered mesoporous irondoped cobalt phosphide(meso-Co_(2-x)Fe_(x)P)was prepared by a nanocasting strategy using SBA-15 as the hard template combined with a subsequent phosphidation.The unique mesoporous structure of the meso-Co_(2-x)Fe_(x)P electrocatalyst resulted in the exposure of abundant active sites and favorable mass transfer for the electrocatalytic process.Due to the synergy effects of the mesoporous structure and ternary component,the meso-Co_(2-x)Fe_(x)P exhibited outstanding electrocatalytic activity with low overpotentials of 93.7 mV and 266.4 mV at a current density of 10 mA cm^(-2) for HER and OER,respectively.In addition,meso-Co_(2-x)Fe_(x)P showed excellent overall water splitting activity with an external voltage of 1.58 V at a current density of 10 mA cm^(-2),superior to the electrolytic cell consisting of 20%Pt/C and RuO_(2),demonstrating it has great potential for practical application in overall water splitting.展开更多
Nitrate-methanol co-electrolysis involving the cathodic nitrate reduction reaction(NO_(3)RR)combined with the anodic methanol oxidation reaction(MOR)is a viable way to synchronously produce ammonia(NH_(3))and formate ...Nitrate-methanol co-electrolysis involving the cathodic nitrate reduction reaction(NO_(3)RR)combined with the anodic methanol oxidation reaction(MOR)is a viable way to synchronously produce ammonia(NH_(3))and formate via gentle,sustainable and energy-saving“E-refining”and“E-reforming”means.An efficient bifunctional catalyst for the NO_(3)RR and MOR is pivotal to achieve such a goal.In this work,a nitrogen-doped carbon-encapsulated nickel iron phosphide hybrid(Ni_(2)FeP@NC)was prepared as a bifunctional catalyst for the NO_(3)RR and MOR,and its electrochemical performance for nitrate-methanol co-electrolysis was investigated.The Ni_(2)FeP@NC catalyst exhibited a high NH_(3) yield(0.47 mmol h^(-1) cm^(-2) at-0.35 V)and faradaic efficiency(FE,93%at-0.15 V)for the NO_(3)RR and simultaneously demonstrated high MOR efficiency for formate production(yield of 1.62 mmol h^(-1) cm^(-2) at 1.7 V and FE of around 95%).The bifunctional catalytic features of the nitrate-methanol co-electrolysis system enabled the concurrent production of NH_(3) and formate at low input voltage.This work provides a viable paradigm for pairwise electrosynthesis of valuable chemicals via“E-refining”and“E-reforming”through the rational design of bifunctional catalysts.展开更多
Fe-doped ZrO2 compounds were prepared by a co-precipitation method.The compounds were characterized by X-ray diffraction,N2 adsorption-desorption,ultraviolet diffuse reflectance infrared Fourier transform spectroscopy...Fe-doped ZrO2 compounds were prepared by a co-precipitation method.The compounds were characterized by X-ray diffraction,N2 adsorption-desorption,ultraviolet diffuse reflectance infrared Fourier transform spectroscopy,scanning electron microscopy-energy-dispersive X-ray spectroscopy,transmission electron microscopy,NH3 temperature-programmed desorption,X-ray photoelectron spectroscopy,and in situ Fourier transform infrared spectroscopy.The incorporation of Fe into ZrO2 lattice favored and effectively stabilized the formation of purely ZrO2 tetragonal phase.Subsequently,the catalytic activity of the Fe-doped ZrO2 compounds was evaluated toward vapor phase methylation of phenol.The catalytic activity was governed by Fe content and related to the Lewis acidity of the prepared catalyst.展开更多
Pure TiO2 thin films and iron doped TiO2 thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer （XRD）, thermo-gravimetric analysis （TG-DSC）, high resolution transm...Pure TiO2 thin films and iron doped TiO2 thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer （XRD）, thermo-gravimetric analysis （TG-DSC）, high resolution transmission electron microscope （HRTEM）, scanning electron microscope （SEM） and UV-Vis spectroscopy, respectively. The experimental results show that the pure TiO2 thin films and iron doped TiO2 thin films can destroy most of the escherichia coli and bacillus subtillis under the irradiation of 365 nm UV-light. However, the iron doped TiO2 thin film is a better photocatalyst than pure TiO2 thin film. The ultrastructural studies provide direct evidences for understanding the bactericidal mechanism of the TiO2 photocatalyst.展开更多
Developing efficient water-splitting electrocatalysts, particularly for the anodic oxygen evolution reaction （OER）, is an important challenge in energy conversion technologies. In this study, we report the developme...Developing efficient water-splitting electrocatalysts, particularly for the anodic oxygen evolution reaction （OER）, is an important challenge in energy conversion technologies. In this study, we report the development of iron-doped nickel disulfide nanoarray on Ti mesh （Fe0.1-NiS2 NA/Ti） via the sulfidation of its nickel-iron-layered double hydroxide precursor （NiFe-LDH NAFFi）. As a three-dimensional OER anode, Fe0.1NiS2 NA/Ti exhibits remarkable activity and stability in 1.0 M KOH, with the requirement of a low overpotential of 231 mV to achieve 100 mA·cm^-2. In addition, it exhibits excellent activity and durability in 30 wt.% KOH. Notably, this electrode is also efficient for the cathodic hydrogen evolution reaction under alkaline conditions.展开更多
Bismuth vanadate(BiVO_(4))is a promising photoanode material for photoelectrochemical(PEC)water oxidation.However,its performance is greatly hindered by poor bulk and interfacial charge transfer.Herein,to address this...Bismuth vanadate(BiVO_(4))is a promising photoanode material for photoelectrochemical(PEC)water oxidation.However,its performance is greatly hindered by poor bulk and interfacial charge transfer.Herein,to address this issue,iron doped vanadyl phosphate(Fe:VOPO_(4))was grafted on molybdenum doped BiVO_(4)(Mo:BiVO_(4))for significantly enhancing charge transfer and oxygen evolution kinetics simultaneously.Consequently,the resultant Fe:VOPO_(4)/Mo:BVO_(4) photoanode exhibits a remarkable photocurrent density of 6.59 mA cm^(-2) at 1.23 V versus the reversible hydrogen electrode(VRHE)under AM 1.5G illumination,over approximately 5.5 times as high as that of pristine BiVO_(4).Systematic studies have demonstrated that the hopping activation energy of small polarons is significantly reduced due to the Mo doping,resulting in accelerated bulk charge transfer.More importantly,the deposition of Fe:VOPO_(4) promotes the interfacial charge transfer between Mo:BiVO_(4) and Fe:VOPO_(4) via the construction of V-O-V and P-O bonds,in addition to facilitating water splitting kinetics.This work provides a general strategy for optimizing charge transfer process,especially at the interface between photoanodes and cocatalysts.展开更多
基金supported by the National Natural Science Foundation of China (21806115)Sichuan Science and Technology Program (2020YJ0149)+1 种基金the Power Construction of China (P42819,DJ-ZDXM-2019-42)the Supported by Sichuan Science and Technology Program (2021ZDZX0012)。
文摘Among the numerous transition metal catalysts,manganese-based compounds are considered as promising peroxymonosulfate(PMS)catalysts due to their low cost and environmental friendliness,such as cryptomelane manganese oxide(K_(2-x)Mn_(8)O_(16):abbreviation KMnO).However,the limited catalytic performance of KMnO limits its practical application.In this work,iron-doped KMnO(Fe-KMnO)was prepared by one-step hydrothermal method to optimize its catalytic performance.Compared with KMnO/PMS system,Fe-KMnO/PMS system possessed more excellent removal efficiency of tetracycline(TC).Meanwhile,the Fe-KMnO/PMS system also exhibited good practical application potential and excellent stability.The mechanism of Fe-KMnO activation of PMS was further analyzed in detail.It was found that Fe participated in the redox of high-valent Mn,which promoted the activation of PMS.Moreover,The Fe site as an adsorption site enhanced the TC enrichment ability of the catalyst,reducing the mass transfer resistance and further enhancing the TC removal ability of Fe-KMnO/PMS system.This work not only provides an excellent PMS catalyst,but also offers new insights into the mechanism of PMS activation by bimetallic manganese-based catalysts.
基金the National Natural Science Foundation of China.
文摘Iron-doped titania nanoparticles exhibit a higher photocatalytic activity than pure TiO_2 for the degradation of nitrite. The optimum Fe-doped content in terms of activity is approximately 0.5%. The increase in photoactivity is probably due to the higher adsorption and the inhibition of electron-hole recombination. The photocatalytic oxidation reaction of nitrite over the Fe-doped TiO_2 catalyst follows zero-order kinetics, which is different from that over pure TiO_2. The reaction rate decreases linearly with the increase of the pH of the solution.
文摘Thispaperisconcerned withthe preparation ofcerium doped yttrium iron garnet which areknown to be an oxide withlarge magneto opticaleffect. Usingtheimproved flux method wesuccessfully grew the bulksinglecrystalsofiron garnet doped by Ce 3 + ions with maximum substitution upto0 349. Here weinvestigatedthedifferentcomposition ofsolution for maxi mum Ce3 + substitution. Thespectra ofthe Faraday rotation andtheoptical absorption were measured inthenearinfrared region fordifferentCe3 + ionsdopediron garnets. The Cesub stitution prominentlyenhancesthe Faradayeffect,andthe Yb and Euionssubstitutefor Yinthe dodecahedralsitesof YIGcanincreasetheconcentration of Ce3 + ions, depresstheforma tion of nonmagnetic Ce4 + ionsbythechargecompensation.
基金supported by the National Natural Science Foundation of China(Grant No.51872292,51902312,and 61804154)the Collaborative Innovation Program of Hefei Science Center,CAS(No.2019HSC-CIP009).
文摘We report an iron covalent doping approach capable of effectively facilitating the hydrogen evolution reaction(HER)activity of tungsten boride(WB_(2)).The results demonstrated that Fe-doped WB_(2)(Fe-WB_(2))can deliver high current densities of 10,100 and 200 mA cm^(−2)at low HER overpotentials of 68,265 and 320 mV in 0.5 M H_(2)SO_(4),respectively.The theoretical calculations unveiled that Fe doping provides highefficiency HER activity sites,namely,Fe sites in Fe-WB_(2)(001)with the lowest H^(*)adsorption free energy value of 0.324 eV and the lowest thermodynamic limiting potential of−1.102 V.Additionally,it was found that Fe-WB_(2)is also electrocatalytically active toward the nitrogen reduction reaction(NRR),with an NH_(3)yield rate of 35.5μg h^(−1)mg^(−1)at−0.15 V(vs.RHE)in 0.05 M H_(2)SO_(4).This is ascribed to Fe doping in WB_(2)(001)decreasing the reaction free energy of the first hydrogenation reaction of the NRR from 0.837 to 0.732 eV and thus boosting the NRR activity of W sites,but the NRR selectivity is lower(faradaic efficiency of 0.78%)due to the superior HER of Fe-WB_(2).
基金supported by the Science&Technology Development Fund of Tianjin Education Commission for Higher Education(2019KJ088).
文摘The electrochemical nitrogen reduction reaction(NRR)is an environmentally friendly and sustainable approach for NH_(3)synthesis at mild pressure and temperature,but the implementation depends on efficient electrocatalysts.Herein,iron-doped ceria multishelled hollow microspheres are explored as an efficient and robust electrocatalyst for the NRR in 0.1 M Na_(2)SO_(4),achieving a high NH_(3)yield of 34.79μg h^(-1)mg_(cat)^(-1)with a considerable faradaic efficiency of 36.66%at-0.4V versus reversible hydrogen electrode(RHE),surpassing the pure ceria catalyst.
基金supported by the National Natural Science Foundation of China(21873018)the Education Department of Jilin Province(JJKH20221154KJ).
文摘Hydrogen production via electrocatalytic water splitting is an efficient strategy to achieve carbon neutrality.However,the slow reaction kinetics of the oxygen evolution reaction(OER)hinders its large-scale industrial application.Therefore,it is crucial to construct efficient,stable,and scalable OER electrocatalysts.This work used a two-step hydrothermal method to prepare cobalt and iron dual-doped NiS_(2) nanosheet arrays(Co,Fe–NiS_(2))on nickel foam.Theoretical and experimental studies demonstrate that the introduction of Co and Fe can modify the space charge redistribution of NiS_(2),optimizing the Gibbs free energy of the OER intermediate and accelerating water splitting kinetics.The catalyst Co,Fe–NiS_(2) exhibits excellent OER performance in alkaline media,achieving a large current density of 500 mA cm^(−2) at an overpotential of only 242 mV due to the synergistic effect of the two dopants.It can maintain its durability for 100 hours at 700 mA cm^(−2) without significant degradation.This study offers valuable insights into the impact of cation dual-doping modulation on catalytic activity and presents a possible pathway for effective industrial water splitting.
基金supported by the National Natural Science Foundation of China(21876114,21761142011,51572174)Shanghai Government(17SG44)+2 种基金International Joint Laboratory on Resource Chemistry(IJLRC)Ministry of Education of China(PCSIRT_IRT_16R49)supported by The Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning and Shuguang Research Program of Shanghai Education Committee~~
文摘Ordered mesoporous Fe/TiO2 was prepared by an evaporation-induced self-assembly method. The iron ions were in situ embedded in the pore wall of the TiO2 framework. The catalyst has excellent light-assisted Fenton catalytic performance under UV and visible light irradiation. X-ray diffraction and transmission electron microscopy results showed that the TiO2 samples have an ordered two-dimensional hexagonal pore structure and an anatase phase structure with high crystallinity. The ordered pore structure of the TiO2 photocatalyst with a large specific surface area is beneficial to mass transfer and light harvesting. Furthermore, iron ions can be controlled by embedding them into the TiO2 framework to prevent iron ion loss and inactivation. After five cycles, the reaction rate of the ordered mesoporous Fe/TiO2 remained unchanged, indicating that the material has stable performance and broad application prospects for the purification of environmental pollutants.
基金supported by National Natural Science Foundation of China(21878130)China Postdoctoral Science Foundation(2018M642180 and 2017T110453).
文摘The development of porous metal phosphides with abundant active sites is of great importance for efficient electrocatalytic water splitting.In this work,three-dimensional(3D)-ordered mesoporous irondoped cobalt phosphide(meso-Co_(2-x)Fe_(x)P)was prepared by a nanocasting strategy using SBA-15 as the hard template combined with a subsequent phosphidation.The unique mesoporous structure of the meso-Co_(2-x)Fe_(x)P electrocatalyst resulted in the exposure of abundant active sites and favorable mass transfer for the electrocatalytic process.Due to the synergy effects of the mesoporous structure and ternary component,the meso-Co_(2-x)Fe_(x)P exhibited outstanding electrocatalytic activity with low overpotentials of 93.7 mV and 266.4 mV at a current density of 10 mA cm^(-2) for HER and OER,respectively.In addition,meso-Co_(2-x)Fe_(x)P showed excellent overall water splitting activity with an external voltage of 1.58 V at a current density of 10 mA cm^(-2),superior to the electrolytic cell consisting of 20%Pt/C and RuO_(2),demonstrating it has great potential for practical application in overall water splitting.
基金supported by NSFC(No.51802084)the 111 Project(No.D17007)Henan Center for Outstanding Oversea Scientists(No.GZS_(2)022017).
文摘Nitrate-methanol co-electrolysis involving the cathodic nitrate reduction reaction(NO_(3)RR)combined with the anodic methanol oxidation reaction(MOR)is a viable way to synchronously produce ammonia(NH_(3))and formate via gentle,sustainable and energy-saving“E-refining”and“E-reforming”means.An efficient bifunctional catalyst for the NO_(3)RR and MOR is pivotal to achieve such a goal.In this work,a nitrogen-doped carbon-encapsulated nickel iron phosphide hybrid(Ni_(2)FeP@NC)was prepared as a bifunctional catalyst for the NO_(3)RR and MOR,and its electrochemical performance for nitrate-methanol co-electrolysis was investigated.The Ni_(2)FeP@NC catalyst exhibited a high NH_(3) yield(0.47 mmol h^(-1) cm^(-2) at-0.35 V)and faradaic efficiency(FE,93%at-0.15 V)for the NO_(3)RR and simultaneously demonstrated high MOR efficiency for formate production(yield of 1.62 mmol h^(-1) cm^(-2) at 1.7 V and FE of around 95%).The bifunctional catalytic features of the nitrate-methanol co-electrolysis system enabled the concurrent production of NH_(3) and formate at low input voltage.This work provides a viable paradigm for pairwise electrosynthesis of valuable chemicals via“E-refining”and“E-reforming”through the rational design of bifunctional catalysts.
文摘Fe-doped ZrO2 compounds were prepared by a co-precipitation method.The compounds were characterized by X-ray diffraction,N2 adsorption-desorption,ultraviolet diffuse reflectance infrared Fourier transform spectroscopy,scanning electron microscopy-energy-dispersive X-ray spectroscopy,transmission electron microscopy,NH3 temperature-programmed desorption,X-ray photoelectron spectroscopy,and in situ Fourier transform infrared spectroscopy.The incorporation of Fe into ZrO2 lattice favored and effectively stabilized the formation of purely ZrO2 tetragonal phase.Subsequently,the catalytic activity of the Fe-doped ZrO2 compounds was evaluated toward vapor phase methylation of phenol.The catalytic activity was governed by Fe content and related to the Lewis acidity of the prepared catalyst.
基金the National"973"Plan Research Project(No.2004CB619204)Educational Ministry Scientific and Technological Research Key Project(No.02052)
文摘Pure TiO2 thin films and iron doped TiO2 thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer （XRD）, thermo-gravimetric analysis （TG-DSC）, high resolution transmission electron microscope （HRTEM）, scanning electron microscope （SEM） and UV-Vis spectroscopy, respectively. The experimental results show that the pure TiO2 thin films and iron doped TiO2 thin films can destroy most of the escherichia coli and bacillus subtillis under the irradiation of 365 nm UV-light. However, the iron doped TiO2 thin film is a better photocatalyst than pure TiO2 thin film. The ultrastructural studies provide direct evidences for understanding the bactericidal mechanism of the TiO2 photocatalyst.
基金This work was supported by the National Natural Science Foundation of China （No. 21575137）.
文摘Developing efficient water-splitting electrocatalysts, particularly for the anodic oxygen evolution reaction （OER）, is an important challenge in energy conversion technologies. In this study, we report the development of iron-doped nickel disulfide nanoarray on Ti mesh （Fe0.1-NiS2 NA/Ti） via the sulfidation of its nickel-iron-layered double hydroxide precursor （NiFe-LDH NAFFi）. As a three-dimensional OER anode, Fe0.1NiS2 NA/Ti exhibits remarkable activity and stability in 1.0 M KOH, with the requirement of a low overpotential of 231 mV to achieve 100 mA·cm^-2. In addition, it exhibits excellent activity and durability in 30 wt.% KOH. Notably, this electrode is also efficient for the cathodic hydrogen evolution reaction under alkaline conditions.
基金supported by the National Natural Science Foundation of China(52373087,51973235,52173091,22208331 and 62274050)Program for Leading Talents of National Ethnic Affairs Commission of China(MZR21001)+2 种基金Hubei Provincial Natural Science Foundation of China(2021CFA022)Wuhan Science and Technology Bureau(2020010601012198)Zhejiang Provincial Natural Science Foundation of China under Grant No.LZ21E020002.
文摘Bismuth vanadate(BiVO_(4))is a promising photoanode material for photoelectrochemical(PEC)water oxidation.However,its performance is greatly hindered by poor bulk and interfacial charge transfer.Herein,to address this issue,iron doped vanadyl phosphate(Fe:VOPO_(4))was grafted on molybdenum doped BiVO_(4)(Mo:BiVO_(4))for significantly enhancing charge transfer and oxygen evolution kinetics simultaneously.Consequently,the resultant Fe:VOPO_(4)/Mo:BVO_(4) photoanode exhibits a remarkable photocurrent density of 6.59 mA cm^(-2) at 1.23 V versus the reversible hydrogen electrode(VRHE)under AM 1.5G illumination,over approximately 5.5 times as high as that of pristine BiVO_(4).Systematic studies have demonstrated that the hopping activation energy of small polarons is significantly reduced due to the Mo doping,resulting in accelerated bulk charge transfer.More importantly,the deposition of Fe:VOPO_(4) promotes the interfacial charge transfer between Mo:BiVO_(4) and Fe:VOPO_(4) via the construction of V-O-V and P-O bonds,in addition to facilitating water splitting kinetics.This work provides a general strategy for optimizing charge transfer process,especially at the interface between photoanodes and cocatalysts.
