Metal selenides for photocatalytic Z-scheme pure water splitting mediated by reduced graphene oxide

作     者：Shanshan Chen Takashi Hisatomi Guijun Ma Zheng Wang Zhenhua Pan Tsuyoshi Takata Kazunari Domen 陈闪山;久富隆史;马贵军;王征;潘振华;高田刚;堂免一成

作者机构：Center for Energy & Environmental Science Shinshu University 4-17-1 Wakasato Nagano-shi Nagano 380-8553 Japan Department of Chemical System Engineering School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan 

出 版 物：《Chinese Journal of Catalysis》 (催化学报（英文）)

年 卷 期：2019年第40卷第11期

页      面：1668-1672页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：financially supported by the Artificial Photosynthesis Project of the New Energy and Industrial Technology Development Organization (NEDO) and Grant-in-Aids for Scientific Research(A)(No.16H02417) Young Scientists(A)(No.15H05494)from the Japan Society for the Promotion of Science(JSPS) 

主　　题：Hydrogen production Photocatalysis Selenide Water splitting Z-scheme 

摘      要：Exploration of novel narrow bandgap semiconductors for overall water splitting is vital for the realization of practical solar H2 production. In the work, solid solutions of zinc selenide and copper gallium selenide with absorption edge wavelengths ranging from 480 to 730 nm were developed. Using these metal selenides as H2-evolving photocatalysts, CoOx/BiVO4 as the O2-evolving photocatalyst, and reduced graphene oxide as the electron mediator, all-solid-state Z-scheme overall pure water splitting systems were constructed. The rate of photocatalytic H2 evolution from aqueous solutions containing Na2S and Na2SO3 as the electron donors was evaluated while employing these selenide photocatalysts at various Zn/(Zn+Cu) and Ga/Cu molar ratios. The data demonstrate that efficient Z-scheme overall water splitting was significantly correlated to the photoelectrochemical performance of the selenide photocatalysts acting as photocathodes, rather than the photocatalytic activities of these materials during the sacrificial H2 evolution.