光电流
咪唑酯
材料科学
沸石咪唑盐骨架
异质结
复合数
可见光谱
光催化
化学工程
金属有机骨架
多孔性
纳米技术
光电子学
化学
催化作用
复合材料
吸附
生物化学
工程类
有机化学
作者
Zhanyuan Yang,Hong Li,Jinke Zhu,Weitao Li,Yanhui Li,Pengfei Zhang
标识
DOI:10.1016/j.jallcom.2023.170926
摘要
BiVO4 is a potentially promising photoanode for photocathodic protection (PCP) of metals. Nonetheless, the fast charge recombination and low electron mobility restrict its further utilization. In this work, a cobalt-based metal-organic frameworks (MOFs), zeolitic imidazolate framework-67 (ZIF-67) is incorporated to form the composite ZIF-67/BiVO4 via a facile electrodeposition method. Results show that the ZIF-67/BiVO4 photoanodes present significantly enhanced PCP performance for 316 stainless steel (SS) in comparison with pure BiVO4. The ZIF-67 modified BiVO4 composites with electrodeposition time of 150 s possess the optimal protection performance. The open circuit potential of 316 SS coupled with ZIF-67/BiVO4 could reach − 0.52 V vs. SCE under visible light irradiation in 3.5 wt% NaCl solution without the hole scavengers. The incorporation of ZIF-67 could enhance the visible light absorption ability (λ > 500 nm). In addition, the sensitization of ZIF-67, the increased specific surface area, and the construction of Z-scheme heterojunctions could dramatically promote the separation of electron-hole pairs and retain the strong redox ability of holes or electrons. The photocurrent density of ZIF-67/BiVO4 could reach 99 μA cm−2, which is about 2.5 times that of pure BiVO4. This work shows that porous ZIF-decorated BiVO4 photoelectrodes can provide highly effective PCP for metals, which suggests a promising idea for designing other BiVO4-based photoelectrodes.
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