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Enhancement of Photoelectrochemical Performance in Water Oxidation over Bismuth Vanadate Photoanodes by Incorporation with Reduced Graphene Oxide
Author(s) -
Hu Yingfei,
Su Yao,
Huang Huiting,
Qian Qinfeng,
Guan Zhongjie,
Feng Jianyong,
Li Zhaosheng,
Zou Zhigang
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500485
Subject(s) - bismuth vanadate , graphene , bismuth , oxide , vanadate , materials science , electrolyte , inorganic chemistry , photoelectrochemical cell , photoelectrochemistry , water splitting , chemical engineering , electrode , electrochemistry , photocatalysis , chemistry , nanotechnology , catalysis , metallurgy , biochemistry , engineering
Abstract Bismuth vanadate photoanodes often suffer from poor electron transport, which restricts their photoelectrochemical performance in water oxidation. Here, reduced graphene oxide sheets with excellent electronic conductivity are introduced to bismuth vanadate photoanode films to provide a channel for electron transport. As a result, the charge separation efficiency of the photoanode films increases from 59 to 78 % at 420 nm and 1.23 V (vs. the reversible hydrogen electrode) under back irradiation. In particular, the onset potential for photoelectrochemical water oxidation over reduced graphene oxide–bismuth vanadate photoanode films has a cathodic shift of approximately 120 mV in potassium borate electrolyte compared to bare bismuth vanadate photoanode films.