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Boosting the catalytic activity of a step-scheme In_(2)O_(3)/ZnIn_(2)S_(4) hybrid system for the photofixation of nitrogen

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Chinese Journal of Catalysis 2022年第2期43卷 265-275页

作者： Jin Zhang Zi-Hao Pan Ying Yang Peng-Fei Wang Chen-Yang Pei Wei Chen Guo-Bo Huang School of Pharmaceutical and Materials Engineering Taizhou UniversityTaizhou 318000ZhejiangChina

In this study,a step-scheme photocatalytic system comprising one-dimensional In_(2)O_(3)nanorods and two-dimensional ZnIn_(2)S_(4)nanosheets was developed for the catalytic photofixation of *** effects of the combination of In_(2)O_(3)with ZnIn_(2)S_(4)on the crystallinity,microstructure,optical absorption,and charge transfer behavior of the In_(2)O_(3)/ZnIn_(2)S_(4)hybrid photocatalysts were *** from the synergistic effects of the photogenerated vacancies and a step-scheme charge separation mechanism,the In_(2)O_(3)/ZnIn_(2)S_(4)hybrid photocatalyst exhibited significantly enhanced catalytic activity compared to those of bare In_(2)O_(3)and pure ZnIn_(2)S_(4),and an optimized 50 wt%In_(2)O_(3)/ZnIn_(2)S_(4)hybrid sample was found to exhibit superior catalytic activity for the photofixation of N2,fixing 18.1±0.77 mg·L-1 of ammonia after exposure to simulated sunlight for 2 ***,the results of trapping experiments and electron paramagnetic resonance investigation to identify the active species confirmed that the catalytic nitrogen photofixation performance was highly correlated with the presence of·CO_(2)-radicals rather than photogenerated electrons,especially when methanol was used as a hole *** summary,the reported In_(2)O_(3)/ZnIn_(2)S_(4)hybrid photocatalysts exhibit both stability and high activity for the photofixation of N_(2),making them promising catalysts for sunlight-driven artificial N_(2)fixation.

关键词： In_(2)O_(3) ZnIn_(2)S_(4) step-scheme Nitrogen photofixation

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In_(2)O_(3-)x(OH)y/Bi_(2)MoO_(6) S-scheme heterojunction for enhanced photocatalytic performance

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Journal of Materials Science & Technology 2020年第21期56卷 151-161页

作者： Zhongfu Li Zhaohui Wu Rongan He Long Wan Shiying Zhang College of Materials Science and Engineering Hunan UniversityChangsha410082China Hunan Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha410005China

Surface heterojunction engineering has been extensively studied to promote efficient charge separation in semiconductor *** an effective heterojunction system to optimize the separation and transport of photo-induced charges is an appealing strategy to enhance the photocatalytic *** this work,In_(2)O_(3)-x(OH)y in situ decorated Bi_(2)MoO_(6) two-dimensional step-scheme heterojunctions were synthesized through a controlled dehydroxylation process of indium-based *** charge transfer mechanism of this step-scheme heterojunctions was confirmed by the characterization of electron structures,reactive species,photoelectric properties and DFT theoretical *** band bending and the internal electric field caused by the charge transfer upon hybridization can effectively promote the separation of charges and present the optimal redox *** addition,surface residual hydroxyl groups can regulate the surface energy state and optimize the interfacial charge transfer kinetics of the prepared step-scheme ***,the step-scheme heterojunction exhibits superior performance in photocatalytic reduction of hexavalent chromium and degradation of organic pollutants under visible light *** work provides an innovative perspective to construct photocatalyst with superior activity.

关键词： step-scheme Heterojunction Bi_(2)MoO_(6) Photocatalyst

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Organic amine surface modified one-dimensional CdSe_(0.8)S_(0.2)-diethylenetriamine/two-dimensional SnNb_(2)O_(6) S-scheme heterojunction with promoted visible-light-driven photocatalytic CO_(2) reduction

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Chinese Journal of Catalysis 2022年第2期43卷 255-264页

作者： Hui Yang Jin feng Zhang Kai Dai Key Laboratory of Green and Precise Synthetic Chemistry and Applications Ministry of EducationSchool of Physics and Electronic InformationHuaibei Normal UniversityHuaibei 235000AnhuiChina

Achieving a strong redox ability and high visible-light absorption ability in a single semiconductor material is *** a heterojunction between two semiconductor materials is a feasible *** new step(S-scheme)heterojunction can effectively promote the separation and trans-fer of photogenerated electron-hole pairs and retain strong redox *** designed and pre-pared a Cd Se_(0.8)S_(0.2)-diethylenetriamine(DETA)/Sn Nb_(2)O_(6)heterostructure material via the sol-vothermal *** Cd Se_(0.8)S_(0.2)-DETA and Sn Nb_(2)O_(6)form an S-scheme heterojunction,30%Cd Se_(0.8)S_(0.2)-DETA/Sn Nb_(2)O_(6)exhibits the highest CO production rate(17.31μmol·g^(-1)·h^(-1)),which is factors of 2.8 and 4.8 higher than that of traditional solvothermal Sn Nb_(2)O_(6)(6.2μmol·g^(-1)·h^(-1))and Cd Se_(0.8)S_(0.2)-DETA(3.6μmol·g^(-1)·h^(-1)),respectively.X-ray photoelectron spectroscopy characterization data provided evidence that the transfer pathway of space charge in the CO_(2)reduction process was in accordance with the *** research provides a simple strategy through which one can optimize the band structure to promote the separation of photogenerated carriers and achieve a high efficiency of CO_(2)reduction.

关键词： Photocatalysis CdSexS1–x-DETA SnNb_(2)O_(6) step-scheme CO_(2)reduction

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