光电流
析氧
氧化剂
氧气
化学工程
材料科学
催化作用
图层(电子)
分解水
金属
薄膜
纳米技术
化学
光催化
光电子学
冶金
电化学
电极
物理化学
有机化学
工程类
生物化学
作者
Jinbo Pan,Binghao Wang,Jin‐Bo Wang,Hongzhi Ding,Wei Zhou,Xuan Liu,Jinrong Zhang,Sheng Shen,Jun‐Kang Guo,Lang Chen,Chak‐Tong Au,Lilong Jiang,Shuang‐Feng Yin
标识
DOI:10.1002/anie.202012550
摘要
Abstract The introduction of oxygen vacancies (Ov) has been regarded as an effective method to enhance the catalytic performance of photoanodes in oxygen evolution reaction (OER). However, their stability under highly oxidizing environment is questionable but was rarely studied. Herein, NiFe‐metal–organic framework (NiFe‐MOFs) was conformally coated on oxygen‐vacancy‐rich BiVO 4 (Ov‐BiVO 4 ) as the protective layer and cocatalyst, forming a core–shell structure with caffeic acid as bridging agent. The as‐synthesized Ov‐BiVO 4 @NiFe‐MOFs exhibits enhanced stability and a remarkable photocurrent density of 5.3±0.15 mA cm −2 at 1.23 V (vs. RHE). The reduced coordination number of Ni(Fe)‐O and elevated valence state of Ni(Fe) in NiFe‐MOFs layer greatly bolster OER, and the shifting of oxygen evolution sites from Ov‐BiVO 4 to NiFe‐MOFs promotes Ov stabilization. Ovs can be effectively preserved by the coating of a thin NiFe‐MOFs layer, leading to a photoanode of enhanced photocurrent and stability.
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