Promoting efficient carrier separation and transfer can largely enhance photocatalytic performance and inhibit photo-corrosion.In this work,ZnCdS(ZCS)microspheres were obtained by a self-assembly strategy,and the Au/C...Promoting efficient carrier separation and transfer can largely enhance photocatalytic performance and inhibit photo-corrosion.In this work,ZnCdS(ZCS)microspheres were obtained by a self-assembly strategy,and the Au/Co_(3)O_(4)/ZCS composites were synthesized by a modified photo-deposition method(loading Co_(3)O_(4)and Au onto the surface of ZnCdS).The synergistic effect between the S-scheme heterojunction(Co_(3)O_(4)/ZCS)and Schottky junc-tion(Au/ZCS)can effectively promote the generation and separation of photoelectrons and holes,thus enhancing the photocatalytic activity.Under visible light,the efficient photocatalysts showed hydrogen production activities up to 2525μmol g^(-1)h^(-1),which is 2.24 times higher than that of Co_(3)O_(4)/ZCS and 6.92 times higher than that of pure ZnCdS.DFT calculations indicate that the built-in electric field between Co_(3)O_(4)/ZCS provides the driving force for efficient electron-hole separation,and the Au nanoparticles(NPs)act as electron collectors at the interface of ZnCdS to capture the electrons,which effectively prolongs the lifetime of photoelectrons and further enhances the photocatalytic hydrogen production activity.展开更多
基金supported by National Natural Science Foundation of China(Nos.52473327,51802351 and 51572295)National Key R&D Program of China(Nos.2021YFA1501300,2019YFC1907602)Science Foundation of China University of Petroleum,Beijing(No.2462017YJRC048).
文摘Promoting efficient carrier separation and transfer can largely enhance photocatalytic performance and inhibit photo-corrosion.In this work,ZnCdS(ZCS)microspheres were obtained by a self-assembly strategy,and the Au/Co_(3)O_(4)/ZCS composites were synthesized by a modified photo-deposition method(loading Co_(3)O_(4)and Au onto the surface of ZnCdS).The synergistic effect between the S-scheme heterojunction(Co_(3)O_(4)/ZCS)and Schottky junc-tion(Au/ZCS)can effectively promote the generation and separation of photoelectrons and holes,thus enhancing the photocatalytic activity.Under visible light,the efficient photocatalysts showed hydrogen production activities up to 2525μmol g^(-1)h^(-1),which is 2.24 times higher than that of Co_(3)O_(4)/ZCS and 6.92 times higher than that of pure ZnCdS.DFT calculations indicate that the built-in electric field between Co_(3)O_(4)/ZCS provides the driving force for efficient electron-hole separation,and the Au nanoparticles(NPs)act as electron collectors at the interface of ZnCdS to capture the electrons,which effectively prolongs the lifetime of photoelectrons and further enhances the photocatalytic hydrogen production activity.
