钒酸铋
纳米孔
光电流
析氧
分解水
光催化
材料科学
化学
无机化学
化学工程
纳米技术
催化作用
电极
电化学
光电子学
生物化学
工程类
物理化学
作者
Taotao Wang,Hongyun Cao,Jiadi Wu,Mohsen Golbon Haghighi,Roya Sedghi,Pingwu Du
标识
DOI:10.1021/acs.jpcc.2c03482
摘要
Bismuth vanadate is an excellent photoanode material for photoelectrocatalytic water oxidation due to the good light absorption and sufficiently positive valence band. However, bare BiVO4 undergoes poor charge separation and transport and slow kinetics of oxygen evolution reaction. Herein, a dual-cocatalyst-modified photoanode is prepared by depositing Ni-(oxy)hydroxide/borate (Ni-OEC) and molecular cobaloxime on a nanoporous BiVO4 photoanode. The optimized BiVO4 photoanode shows an excellent photocurrent density under AM 1.5 G illumination (5.1 mA cm–2 at 1.23 V vs RHE), which is among the highest values using cocatalyst-modified BiVO4 photoanodes for PEC water oxidation. Furthermore, the maximum surface charge injection efficiency and incident photon-to-current efficiency of the ultimate composite photoanode are 85.6% (at 1.23 V vs RHE) and 83.6%, respectively. These results indicate that surface-modified Ni-OEC and molecular cobaloxime can highly improve the photoelectrocatalytic performance of bare BiVO4.
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