Key Words:PHOTOCATALYTIC HYDROGEN-PRODUCTION; TOTAL-ENERGY CALCULATIONS; GRAPHITIC CARBON NITRIDE; CATALYSTS; CDS; COCATALYST; NANOSHEETS; NANOWIRES; CD1-XZNXS; SIZE

Abstract:Energy band structure and interfacial compatibility of heterojunctions are crucial for photocatalysts in promoting photogenerated charge separation and transfer. Here, a combined strategy of vacancy engineering and quantum effect via a facile phosphating process is reported, for the first time, to modulate the energy band structure and the interface of ZnxCd1-xS/CoP quantum dots (ZCS(v)/CoP QDs) heterojunction. The combined experimental and theoretical investigation revealed that phosphating process transformed CoOx QDs to CoP QDs, and more importantly, generated considerable amount of sulfur vacancies in ZCS(v). As a result, a Type II ZCS(v)/CoP QDs heterojunction with compatible interfaces was constructed via in-situ generated P-Zn, P-Cd and S-Co bonds, which facilitated the separation and transfer of the photogenerated charge and thus resulted in a high ability towards hydrogen evolution under visible light (17.53 mmol g(-1) h(-1)). This work provides an effective and adaptable strategy to modulate band structure and interfacial compatibility of heterojunctions via vacancy engineering and quantum effect. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

Volume:61

Issue:

Translation or Not:no