A molecular cobaloxime cocatalyst and ultrathin FeOOH nanolayers co-modifiedBiVO_(4) photoanode for efficient photoelectrochemical water oxidation  

作　　者：Hongyun Cao Taotao Wang Jiaxing Li Jinbao Wu Pingwu Du 

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale,CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,iChEM(Collaborative Innovation Center of Chemistry for Energy Materials),University of Science and Technology of China,Hefei 230026,Anhui,China [2]National Synchrotron Radiation Laboratory,University of Science and Technology of China,443 Huangshan Road,Hefei 230029,Anhui,China

出　　处：《Journal of Energy Chemistry》2022年第6期497-505,I0014,共10页能源化学（英文版）

基　　金：financially supported by the National Key Research and Development Program of China (2017YFA0402800);the National Natural Science Foundation of China (U1932214, 51772285);the National Synchrotron Radiation Laboratory at USTC。

摘　　要：BiVO_(4) has been attracting a lot of interest in photoelectrochemical (PEC) water oxidation due to its efficient solar absorption and appropriate band positions.So far,sluggish water oxidation kinetics and fast photogenerated charge recombination still hinder the PEC performance ofBiVO_(4) .In this study,a novel PEC photoanode was designed by depositing ultrathin FeOOH nanolayers on the surface of nanoporousBiVO_(4) electrode,followed by modification with a cobaloxime (Co(dmgH)_(2)(4-COOH-py)Cl) molecular cocatalyst.Under irradiation of a 100 mW cm^(-2)(AM 1.5G) Xe lamp,the photocurrent density of the cobaloxime/FeOOH/BiVO_(4) composite photoanode reached 5.1 mA cm^(-2)at 1.23 V vs.RHE in 1.0 M potassium borate buffer solution (pH=9.0).The onset potential of the optimal cobaloxime/FeOOH/BiVO_(4) photoanode exhibited a 460 m V cathodic shift relative to bareBiVO_(4) .In addition,the surface charge injection efficiency of the composite photoanode reached~80%at 1.23 V vs.RHE and the incident photon-to-current efficiency (IPCE) reached~88%at 420 nm.

关 键 词：BiVO_(4) Photoelectrochemical water oxidation COBALOXIME Charge injection efficiency Synergistic effect 

分 类 号：TQ116.21[化学工程—无机化工] O643.36[理学—物理化学]