钒酸铋
光催化
分解水
氧化还原
异质结
材料科学
纳米技术
化学工程
纳米复合材料
催化作用
光化学
化学
无机化学
光电子学
生物化学
工程类
作者
Yu Qi,Jiangwei Zhang,Yuan Kong,Yüe Zhao,Shanshan Chen,Li Deng,Wei Liu,Yifan Chen,Tengfeng Xie,Junyan Cui,Can Li,Kazunari Domen,Fuxiang Zhang
标识
DOI:10.1038/s41467-022-28146-6
摘要
Bismuth vanadate (BiVO4) has been widely investigated as a photocatalyst or photoanode for solar water splitting, but its activity is hindered by inefficient cocatalysts and limited understanding of the underlying mechanism. Here we demonstrate significantly enhanced water oxidation on the particulate BiVO4 photocatalyst via in situ facet-selective photodeposition of dual-cocatalysts that exist separately as metallic Ir nanoparticles and nanocomposite of FeOOH and CoOOH (denoted as FeCoOx), as revealed by advanced techniques. The mechanism of water oxidation promoted by the dual-cocatalysts is experimentally and theoretically unraveled, and mainly ascribed to the synergistic effect of the spatially separated dual-cocatalysts (Ir, FeCoOx) on both interface charge separation and surface catalysis. Combined with the H2-evolving photocatalysts, we finally construct a Z-scheme overall water splitting system using [Fe(CN)6]3-/4- as the redox mediator, whose apparent quantum efficiency at 420 nm and solar-to-hydrogen conversion efficiency are optimized to be 12.3% and 0.6%, respectively.
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