The construction of crystalline/amorphous g-C_(3)N_(4)homojunctions presents a versatile strategy to obtain all-organic homojunction photocatalysts with better interface matching and lower interface charge carrier mov...The construction of crystalline/amorphous g-C_(3)N_(4)homojunctions presents a versatile strategy to obtain all-organic homojunction photocatalysts with better interface matching and lower interface charge carrier movement resistance for optimized photocatalytic activity.However,the process entails a complex multi-step workup,which compromises its feasibility.To overcome this challenge,this work provided an innovative Na_(2)CO_(3)-induced crystallinity modulation strategy to construct a Na-doped crystalline/amorphous g-C_(3)N_(4)S-scheme homojunction photocatalyst in a single step.The approach involves the initial pre-assembling of melamine and cyanuric acid molecules,and subsequent introduction of Na_(2)CO_(3)before the calcination.Na_(2)CO_(3)plays key roles to induce in-situ crystallinity modulation during the calcination and as a source for Na-doping.The prepared g-C_(3)N_(4)S-scheme homojunction photocatalyst demonstrated a prominent H_(2)O_(2)-production rate of 444.6μmol·L^(-1)·h^(-1),which is 6.1-fold higher than that of bulk g-C_(3)N_(4).The enhanced activity was attributed to the synergistic effect of charge carrier separation induced by the S-scheme homojunction system,and the optimized interfacial H_(2)O_(2)generation kinetics.The latter was fostered by the Na-doping.This study provides an innovative approach for the one-step construction of g-C_(3)N_(4)S-scheme homojunction and its integration in photocatalytic applications.展开更多
This study was designed to prepare silver, zinc and gold nanoparticles (NPs), AgNPs, ZnNPs and AuNPs, by biosynthesis technique using methanolic extract of </span><i><span style="font-family:Verdan...This study was designed to prepare silver, zinc and gold nanoparticles (NPs), AgNPs, ZnNPs and AuNPs, by biosynthesis technique using methanolic extract of </span><i><span style="font-family:Verdana;">Rhanterium</span></i><span style="font-family:Verdana;"> <i>epapposum</i></span><span style="font-family:Verdana;"> flowers using AgNO</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">, Zn (CH</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">CO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">)</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;"> and HAuCl</span><sub><span style="font-family:Verdana;">4</span></sub><span style="font-family:Verdana;">·3H</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">O as starting materials. The physical properties of the formed NPs were characterized by ultraviolet spectroscopy (UV), X-ray diffraction (XRD), transmission electron microscopy and Fourier transformed infrared spectroscopy (FTIR). The results revealed that, AgNPs were homogeneous and spherical in shape, with average diameter 16.3 nm. While, ZnNPs were approximately triangle and hexagonal shaped, with average diameter 23.5 nm. Most of the synthesized AuNPs were spherical in shape with average diameter 17.9 nm. The antifungal activity of different concentrations of the formed AgNPs, ZnNPs and AuNPs was tested against two human </span></span><span style="font-family:Verdana;">pathogens</span><span style="font-family:Verdana;">:</span><span style="font-family:""> </span><i><span style="font-family:Verdana;">Candida albicans</span></i><span style="font-family:""><span style="font-family:Verdana;"> and </span><i><span style="font-family:Verdana;">Aspergillus</span></i><span style="font-family:Verdana;"> <i>melleus</i></span><span style="font-family:Verdana;"> and one plant pathogenic fungus</span></span><span style="font-family:Verdana;">:</span><span style="font-family:""> <i><span style="font-family:Verdana;">Phoma</span></i><span style="font-family:Verdana;"> <i>exigua</i></span><span style="font-family:Verdana;">, using agar diffusion assay. The best results recorded by 120 μg/ml AgNPs against the human pathogen</span></span><span style="font-family:Verdana;">:</span><span style="font-family:Verdana;"> <i>C</i></span><i><span style="font-family:Verdana;">.</span></i><span style="font-family:Verdana;"> <i>albicans</i></span><span style="font-family:Verdana;"> where the inhibition zone was 23.5 mm. Additionally, the cytotoxicity of the tested NPs was evaluated against Breast adenocarcinoma (MCF-7)</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> Hepatocellular carcinoma (HepG-2) and colorectal carcinoma (HCT 116) human cell lines. The most toxic was AuNPs where the IC50 against MCF-7, HepG2 and HCT116 was 55.02, 66.44 and 169.87 μg/mL respectively.展开更多
In this insight,we highlighted the emergence of a plasmonic response over ZnO/CuInS_(2)S-scheme heterojunction,which has been recently reported by Meng et al.(Adv.Mater.2024,36,2406460).The surface plasmon resonance(S...In this insight,we highlighted the emergence of a plasmonic response over ZnO/CuInS_(2)S-scheme heterojunction,which has been recently reported by Meng et al.(Adv.Mater.2024,36,2406460).The surface plasmon resonance(SPR)effect is widely acknowledged in plasmonic metal nanoparticles or defective nanocrystals.In their work,Meng et al.proposed another approach to generate a plasmonic response in S-scheme heterojunction photocatalysts.By virtue of the SPR effect,the obtained ZnO/CuInS_(2)photocatalyst exhibited supreme photocatalytic activity for H_(2)O_(2)production under near-infrared(NIR)light.This heterojunction-induced plasmonic response is mainly concentrated in the IR regime thus extending the photocatalytic activity beyond the visible light limit and opening new avenues for boosting the development of heterojunctions in artificial photosynthesis.展开更多
In recent years,photocatalytic technology,driven by solar energy,has been extensively investigated to ease energy crisis and environmental pollution.Nevertheless,efficiency and stability of photocatalysts are still un...In recent years,photocatalytic technology,driven by solar energy,has been extensively investigated to ease energy crisis and environmental pollution.Nevertheless,efficiency and stability of photocatalysts are still unsatisfactory.To address these issues,design of advanced photocatalysts is important.Cadmium sulphide(CdS)nanomaterials are one of the promising photocatalysts.Among them,hollow-structured CdS,featured with enhanced light absorption ability,large surface area,abundant active sites for redox reactions,and reduced diffusion distance of photogenerated carriers,reveals a broad application prospect.Herein,main synthetic strategies and formation mechanism of hollow CdS photocatalysts are summarized.Besides,we comprehensively discuss the current development of hollow-structured CdS nanomaterials in photocatalytic applications,including H2 production,CO2 reduction and pollutant degradation.Finally,brief conclusions and perspectives on the challenges and future directions for hollow CdS photocatalysts are proposed.展开更多
The use of gas diffusion electrode(GDE)based flow cell can realize industrial-scale CO_(2) reduction reactions(CO_(2)RRs).Controlling local CO_(2) and CO intermediate diffusion plays a key role in CO_(2)RR toward mult...The use of gas diffusion electrode(GDE)based flow cell can realize industrial-scale CO_(2) reduction reactions(CO_(2)RRs).Controlling local CO_(2) and CO intermediate diffusion plays a key role in CO_(2)RR toward multi-carbon(C_(2+))products.In this work,local CO_(2) and CO intermediate diffusion through the catalyst layer(CL)was investigated for improving CO_(2)RR toward C_(2+)products.The gas permeability tests and finite element simulation results indicated CL can balance the CO_(2) gas diffusion and residence time of the CO intermediate,leading to a sufficient CO concentration with a suitable CO_(2)/H_(2)O supply for high C_(2+)products.As a result,an excellent selectivity of C_(2+)products~79%at a high current density of 400 mA·cm^(-2) could be obtained on the optimal 500 nm Cu CL(Cu500).This work provides a new insight into the optimization of CO_(2)/H_(2)O supply and local CO concentration by controlling CL for C_(2+)products in CO_(2)RR flow cell.展开更多
文摘The construction of crystalline/amorphous g-C_(3)N_(4)homojunctions presents a versatile strategy to obtain all-organic homojunction photocatalysts with better interface matching and lower interface charge carrier movement resistance for optimized photocatalytic activity.However,the process entails a complex multi-step workup,which compromises its feasibility.To overcome this challenge,this work provided an innovative Na_(2)CO_(3)-induced crystallinity modulation strategy to construct a Na-doped crystalline/amorphous g-C_(3)N_(4)S-scheme homojunction photocatalyst in a single step.The approach involves the initial pre-assembling of melamine and cyanuric acid molecules,and subsequent introduction of Na_(2)CO_(3)before the calcination.Na_(2)CO_(3)plays key roles to induce in-situ crystallinity modulation during the calcination and as a source for Na-doping.The prepared g-C_(3)N_(4)S-scheme homojunction photocatalyst demonstrated a prominent H_(2)O_(2)-production rate of 444.6μmol·L^(-1)·h^(-1),which is 6.1-fold higher than that of bulk g-C_(3)N_(4).The enhanced activity was attributed to the synergistic effect of charge carrier separation induced by the S-scheme homojunction system,and the optimized interfacial H_(2)O_(2)generation kinetics.The latter was fostered by the Na-doping.This study provides an innovative approach for the one-step construction of g-C_(3)N_(4)S-scheme homojunction and its integration in photocatalytic applications.
文摘This study was designed to prepare silver, zinc and gold nanoparticles (NPs), AgNPs, ZnNPs and AuNPs, by biosynthesis technique using methanolic extract of </span><i><span style="font-family:Verdana;">Rhanterium</span></i><span style="font-family:Verdana;"> <i>epapposum</i></span><span style="font-family:Verdana;"> flowers using AgNO</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">, Zn (CH</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">CO</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">)</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;"> and HAuCl</span><sub><span style="font-family:Verdana;">4</span></sub><span style="font-family:Verdana;">·3H</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">O as starting materials. The physical properties of the formed NPs were characterized by ultraviolet spectroscopy (UV), X-ray diffraction (XRD), transmission electron microscopy and Fourier transformed infrared spectroscopy (FTIR). The results revealed that, AgNPs were homogeneous and spherical in shape, with average diameter 16.3 nm. While, ZnNPs were approximately triangle and hexagonal shaped, with average diameter 23.5 nm. Most of the synthesized AuNPs were spherical in shape with average diameter 17.9 nm. The antifungal activity of different concentrations of the formed AgNPs, ZnNPs and AuNPs was tested against two human </span></span><span style="font-family:Verdana;">pathogens</span><span style="font-family:Verdana;">:</span><span style="font-family:""> </span><i><span style="font-family:Verdana;">Candida albicans</span></i><span style="font-family:""><span style="font-family:Verdana;"> and </span><i><span style="font-family:Verdana;">Aspergillus</span></i><span style="font-family:Verdana;"> <i>melleus</i></span><span style="font-family:Verdana;"> and one plant pathogenic fungus</span></span><span style="font-family:Verdana;">:</span><span style="font-family:""> <i><span style="font-family:Verdana;">Phoma</span></i><span style="font-family:Verdana;"> <i>exigua</i></span><span style="font-family:Verdana;">, using agar diffusion assay. The best results recorded by 120 μg/ml AgNPs against the human pathogen</span></span><span style="font-family:Verdana;">:</span><span style="font-family:Verdana;"> <i>C</i></span><i><span style="font-family:Verdana;">.</span></i><span style="font-family:Verdana;"> <i>albicans</i></span><span style="font-family:Verdana;"> where the inhibition zone was 23.5 mm. Additionally, the cytotoxicity of the tested NPs was evaluated against Breast adenocarcinoma (MCF-7)</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> Hepatocellular carcinoma (HepG-2) and colorectal carcinoma (HCT 116) human cell lines. The most toxic was AuNPs where the IC50 against MCF-7, HepG2 and HCT116 was 55.02, 66.44 and 169.87 μg/mL respectively.
基金supported by the National Natural Science Foundation of China(No.W2433135,52174238 and 52073034).
文摘In this insight,we highlighted the emergence of a plasmonic response over ZnO/CuInS_(2)S-scheme heterojunction,which has been recently reported by Meng et al.(Adv.Mater.2024,36,2406460).The surface plasmon resonance(SPR)effect is widely acknowledged in plasmonic metal nanoparticles or defective nanocrystals.In their work,Meng et al.proposed another approach to generate a plasmonic response in S-scheme heterojunction photocatalysts.By virtue of the SPR effect,the obtained ZnO/CuInS_(2)photocatalyst exhibited supreme photocatalytic activity for H_(2)O_(2)production under near-infrared(NIR)light.This heterojunction-induced plasmonic response is mainly concentrated in the IR regime thus extending the photocatalytic activity beyond the visible light limit and opening new avenues for boosting the development of heterojunctions in artificial photosynthesis.
基金supported by the National Key Research and Development Program of China(2018YFB1502001)the National Natural Science Foundation of China(51932007,51961135303,U1905215,21871217,and U1705251)+1 种基金National Innovation and Entrepreneurship Training Program for College Students(No.201910497026)the Innovative Research Funds of Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory(XHD2020-001).
文摘In recent years,photocatalytic technology,driven by solar energy,has been extensively investigated to ease energy crisis and environmental pollution.Nevertheless,efficiency and stability of photocatalysts are still unsatisfactory.To address these issues,design of advanced photocatalysts is important.Cadmium sulphide(CdS)nanomaterials are one of the promising photocatalysts.Among them,hollow-structured CdS,featured with enhanced light absorption ability,large surface area,abundant active sites for redox reactions,and reduced diffusion distance of photogenerated carriers,reveals a broad application prospect.Herein,main synthetic strategies and formation mechanism of hollow CdS photocatalysts are summarized.Besides,we comprehensively discuss the current development of hollow-structured CdS nanomaterials in photocatalytic applications,including H2 production,CO2 reduction and pollutant degradation.Finally,brief conclusions and perspectives on the challenges and future directions for hollow CdS photocatalysts are proposed.
基金The authors gratefully thank the National Natural Science Foundation of China(No.22002189)Central South University Research Programme of Advanced Interdisciplinary Studies(No.2023QYJC012)+1 种基金Central South University Innovation-Driven Research Program(No.2023CXQD042)the Fundamental Research Funds for the Central Universities of Central South University(No.2023ZZTS0962).
文摘The use of gas diffusion electrode(GDE)based flow cell can realize industrial-scale CO_(2) reduction reactions(CO_(2)RRs).Controlling local CO_(2) and CO intermediate diffusion plays a key role in CO_(2)RR toward multi-carbon(C_(2+))products.In this work,local CO_(2) and CO intermediate diffusion through the catalyst layer(CL)was investigated for improving CO_(2)RR toward C_(2+)products.The gas permeability tests and finite element simulation results indicated CL can balance the CO_(2) gas diffusion and residence time of the CO intermediate,leading to a sufficient CO concentration with a suitable CO_(2)/H_(2)O supply for high C_(2+)products.As a result,an excellent selectivity of C_(2+)products~79%at a high current density of 400 mA·cm^(-2) could be obtained on the optimal 500 nm Cu CL(Cu500).This work provides a new insight into the optimization of CO_(2)/H_(2)O supply and local CO concentration by controlling CL for C_(2+)products in CO_(2)RR flow cell.
