钝化
镍
光电流
钴
硫化钴
材料科学
硫化镍
硫化物
动力学
分解水
重组
析氧
催化作用
化学工程
图层(电子)
无机化学
化学
光催化
电化学
纳米技术
物理化学
冶金
电极
光电子学
生物化学
工程类
物理
基因
量子力学
作者
Yumeng Lu,Jinzhan Su,Jinwen Shi,Di Zhou
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2020-08-31
卷期号:3 (9): 9089-9097
被引量:29
标识
DOI:10.1021/acsaem.0c01474
摘要
The photoelectrochemical (PEC) water splitting performance of BiVO4 is limited by its sluggish surface water oxidation kinetics, which could be addressed by surface modification with oxygen evolution catalysts (OECs) as cocatalysts. Here, an ultrathin layer of cobalt/nickel-based sulfide is successfully deposited on the pyramidal BiVO4 photoanode as a cocatalyst to improve its surface kinetics. An increased photocurrent density and negative shift of onset potential are achieved for this BiVO4/cocatalyst composite, with nearly 99% of surface hole injection yield. The kinetic data based on IMPS show that the presence of a cocatalyst brings about a great decrease in surface charge recombination rate from 150 to 22 s–1 at 0.8 V vs RHE, which reveals that the cobalt/nickel sulfide cocatalyst serves as a passivation layer to suppress recombination at surface states and consequently enhance surface water oxidation kinetics.
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