通过元素剂工程提高BiVO4的光电化学性能:同时优化带结构和氧气空缺
1State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, People's Republic of China.
Journal of colloid and interface science
|March 10, 2026
概括
兴奋剂通过增加氧气空缺并改善电荷转移以实现高效的水分裂,显著增强了瓦纳酸盐 (BiVO4) 光电极. 这一策略提高了氧气演化反应 (OER) 的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 光催化作用的光催化
- 电化学 电化学 电化学
背景情况:
- 岩瓦纳酸盐 (BiVO4) 具有较差的孔移动性和缓慢的氧演化反应 (OER) 动力学,限制了其在光电化学水分裂中的应用.
- 元素兴奋剂是一种有希望的策略,通过修改电子结构和增强催化活性来克服这些局限性.
研究的目的:
- 研究 (Co) 兴奋剂对BiVO4.4的特性和光电化学性能的影响.
- 探索辅助剂改善OER动力学和电荷载体动力学的机制.
主要方法:
- 合成与合的BiVO4 (Co:BiVO4) 光电极.
- 材料属性的表征,包括氧空度,带结构和工作功能,使用DFT和现场光谱等技术.
- 光电化学测量包括充电注入效率,发生光子对电流效率 (IPCE) 和在AM 1.5G照明下法拉第效率.
主要成果:
- 与未使用剂的BiVO4.4相比,Co:BiVO4的氧空度增加了45.5倍.
- 协同兴奋剂缩小了带隙,减少了工作功能,并增强了内置的电场,抑制了载体重组.
- Co:BiVO4显示了充电注入效率 (51.30%) 和IPCE (22.34%在420nm) 的改进,高于92.7%的Faradaic效率用于H2和O2在催化剂负载时的演变.
结论:
- 化是一种有效的策略,可以同时调节BiVO4.4的带结构和氧空隙度.
- 在现场形成活性氧化物和改进的充电动力学显著提高了OER性能.
- 合理的兴奋剂为开发用于光催化应用的高性能BiVO4光电极提供了途径.
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