在BiVO4光电极中解脱和补偿表面空缺,通过水热扩散策略进行增强的光电化学水氧化
Xiaokang Wan1, Xiaoqian Luo1, Gezhong Liu1
1School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China.
ACS applied materials & interfaces
|January 21, 2026
概括
在米瓦纳酸盐 (BiVO4) 光电极中的表面空缺导致电荷重组. 一种新的热水法弥补了这些缺陷,大大提高了太阳能燃料应用的光电化学性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 光催化作用的光催化
背景情况:
- BiVO4的光电化学 (PEC) 性能通常由可催化剂增强.
- 这些增强背后的精确机制 (电荷重组与氧气演变反应动力学) 和表面缺陷的作用仍然不清楚.
研究的目的:
- 调查BiVO4.4中PEC性能提升的主要原因.
- 在BiVO4.4中制定补偿表面空缺的战略.
- 为太阳能燃料应用设计一种高性能光电极.
主要方法:
- 水热扩散策略构建一个混合BVO (V) /VOx光电极.
- 在VOx沉积过程中同时将V5+引入BiVO4网格.
- 通过解决空缺的表面缺陷补偿.
主要成果:
- 混合的BVO (V) /VOx光电极有效地补偿了表面的空缺.
- PEC增强主要归因于抑制的表面电荷重组,而不仅仅是改善了氧气演化反应动力学.
- 优化的BVO(V) /VOx/FeNiOx光电极实现了5.82mA cm-2的光电密度,在1.23V与RHE (比原始BiVO4高5.18倍) 时达到5.82mA cm-2.
- 观察到近单位的电荷分离效率和优异的长期耐用性.
结论:
- 表面空缺是BiVO4.4中界面电荷再组合的主要原因.
- 水热V源扩散是补偿缺陷和提高光电极性能的一种可行的策略.
- 这项工作为BiVO4表面缺陷状态提供了洞察力,并为太阳能燃料光电极提供了强大的表面工程方法.
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