Unraveling of cocatalysts photodeposited selectively on facets of BiVO(4) to boost solar water splitting.
Unraveling of cocatalysts photodeposited selectively on facets of BiVO(4) to boost solar water splitting.
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解开选择性光沉积在 BiVO4 面上的助催化剂以促进太阳能水分解
DOI：
10.1038/s41467-022-28146-6
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发表时间：
2022-01-25
影响因子：
16.6
通讯作者：
Zhang F
中科院分区：
文献类型：
--
作者：
Qi Y;Zhang J;Kong Y;Zhao Y;Chen S;Li D;Liu W;Chen Y;Xie T;Cui J;Li C;Domen K;Zhang F
钒酸铋(BiVO4)作为太阳能分解水的光催化剂或光阳极已被广泛研究，但其活性受到低效助催化剂和对其基本机理的有限了解的阻碍。在这里，我们展示了显着增强颗粒BiVO4光催化剂上的水氧化，通过原位面选择光沉积的双助催化剂，分别以金属Ir纳米颗粒和FeOOH和CoOOH纳米复合材料(记为FeCoOx)存在，正如先进技术所揭示的那样。从实验和理论上揭示了双助催化剂促进水氧化的机理，主要归因于空间分离的双助催化剂(Ir，FeCoOx)对界面电荷分离和表面催化的协同作用。结合析氢光催化剂，我们最终构建了以[Fe(CN)6]3−/4−为氧化还原介体的Z方案整体裂水体系，其420nm处的表观量子效率和光氢转换效率分别为12.3%和0.6%。
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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影响因子：
16.6
作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
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发表时间：
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作者：
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