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Promotion of Photoelectrochemical Performance of BiVO4 by Binary ZnCo-LDH Co-catalyst
Author NameAffiliationE-mail
LI Na Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China  
WANG Mu-Heng Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China  
ZHAO Yong Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China  
YAO Rui Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China  
LIU Guang Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China liuguang@tyut.edu.cn 
LI Jin-Ping Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Tianyuan University of Technology, Taiyuan 030024, China jpli211@hotmail.com 
Abstract: Bismuth vanadate (BiVO4) is one of the most promising photoanode materials for converting solar energy into hydrogen energy (STH). However, the practical application of BiVO4 is severely hindered by the intrinsically severe electron-hole recombination. Here, we reported bismuth vanadate (BiVO4) photoanode decorated with binary zinc-cobalt LDHs (ZnCo-LDH) co-catalyst by one-step electrodeposition method, which greatly enhances light absorption capacities of bismuth vanadate (BiVO4), accelerates water oxidation kinetics, facilitates efficient hole transfer to the surface and reduces the surface charge recombination. The hybrid photoanode exhibited a high photocurrent density of 2.85 mA·cm-2 at 1.23 V(vs RHE), which corresponds to a 259% increase compared to that of the pristine BiVO4 photoanode. Furthermore, the onset potential (Von) has greatly decreased from 930 to 270 mV, which displays that OER kinetics is improved upon the deposition of ZnCo-LDH. In addition, the BiVO4/ZnCo-LDH composite photoanode showed a high surface charge separation efficiency of 65%, which is 2.17 times that of BiVO4.
Keywords: bismuth vanadate  photoelectrochemical (PEC) properties  zinc-cobalt LDH co-catalyst  charge separation
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LI Na,WANG Mu-Heng,ZHAO Yong,YAO Rui,LIU Guang,LI Jin-Ping.Promotion of Photoelectrochemical Performance of BiVO4 by Binary ZnCo-LDH Co-catalyst[J].Chinese Journal of Inorganic Chemistry,2019,35(10):1773-1780.
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Chinese Journal of Inorganic Chemistry