The intensifying global energy crisis,coupled with environmental degradation from fossil fuels,highlights that photocatalytic hydrogen evolution technology offers a promising solution due to its efficiency and sustain...The intensifying global energy crisis,coupled with environmental degradation from fossil fuels,highlights that photocatalytic hydrogen evolution technology offers a promising solution due to its efficiency and sustainability.In this study,we synthesized CeO_(2)/Cd_(7.23)Zn_(2.77)S_(10)-DETA(diethylenetriamine is abbreviated as DETA,and subsequently CeO_(2)is referred to as EO,Cd_(7.23)Zn_(2.77)S_(10)-DETA is abbreviated as ZCS,and the composite with EO comprising 30%is abbreviated as EO/ZCS)nanocomposites with S-scheme heterojunctions.Under conditions without external co-catalysts and utilizing only visible light as the excitation source,EO/ZCS nanocomposites exhibited outstanding photocatalytic hydrogen evolution activity and remarkable stability,presenting significant advantages over conventional methods that rely on co-catalysts and ultraviolet light.The photocatalytic hydrogen evolution rate of EO/ZCS nanocomposites reached 4.11 mmol/(g·h),significantly surpassing that of EO(trace)and ZCS(2.78 mmol/(g·h)).This substantial enhancement is attributed to the S-scheme charge transfer mechanism at the heterojunctions in EO/ZCS nanocomposites,which effectively facilitates the efficient separation and transfer of photogenerated electron-hole pairs,thereby substantially enhancing photocatalytic hydrogen evolution activity.Through techniques such as X-ray photoelectron spectroscopy(XPS)and theoretical calculations,we confirmed the formation of S-scheme heterojunctions and elucidated their photocatalytic hydrogen evolution mechanism.The results underscore the potential of EO/ZCS nanocomposites as highly efficient and stable photocatalysts for hydrogen production under environmentally benign conditions.展开更多
基金Project(42407636)supported by the National Natural Science Foundation of ChinaProject(2022AH040068)supported by the Major Foundation of the Educational Commission of Anhui Province,China+2 种基金Project(2023AH051861)supported by the Natural Science Research Project for Colleges and Universities in Anhui Province,ChinaProject(SPYJ202201)supported by the Talent Introduction Foundation of Anhui Science and Technology University,ChinaProject(202310879096)supported by the Innovation and Entrepreneurship Training Program for College Students,China。
文摘The intensifying global energy crisis,coupled with environmental degradation from fossil fuels,highlights that photocatalytic hydrogen evolution technology offers a promising solution due to its efficiency and sustainability.In this study,we synthesized CeO_(2)/Cd_(7.23)Zn_(2.77)S_(10)-DETA(diethylenetriamine is abbreviated as DETA,and subsequently CeO_(2)is referred to as EO,Cd_(7.23)Zn_(2.77)S_(10)-DETA is abbreviated as ZCS,and the composite with EO comprising 30%is abbreviated as EO/ZCS)nanocomposites with S-scheme heterojunctions.Under conditions without external co-catalysts and utilizing only visible light as the excitation source,EO/ZCS nanocomposites exhibited outstanding photocatalytic hydrogen evolution activity and remarkable stability,presenting significant advantages over conventional methods that rely on co-catalysts and ultraviolet light.The photocatalytic hydrogen evolution rate of EO/ZCS nanocomposites reached 4.11 mmol/(g·h),significantly surpassing that of EO(trace)and ZCS(2.78 mmol/(g·h)).This substantial enhancement is attributed to the S-scheme charge transfer mechanism at the heterojunctions in EO/ZCS nanocomposites,which effectively facilitates the efficient separation and transfer of photogenerated electron-hole pairs,thereby substantially enhancing photocatalytic hydrogen evolution activity.Through techniques such as X-ray photoelectron spectroscopy(XPS)and theoretical calculations,we confirmed the formation of S-scheme heterojunctions and elucidated their photocatalytic hydrogen evolution mechanism.The results underscore the potential of EO/ZCS nanocomposites as highly efficient and stable photocatalysts for hydrogen production under environmentally benign conditions.
