通过原子精确的异原子剂提高过渡金属氧化物的水氧化性能
Zhipu Zhang1,2, Shanshan Lu1,2, Moshuqi Zhu3,4
1State Key Laboratory of Advanced Materials for Intelligent Sensing & Key Laboratory of Organic Integrated Circuits, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China.
Journal of the American Chemical Society
|June 16, 2025
概括
通过稳定活性位并提高催化剂稳定性,对氧化物与进行原子精确的注增强了氧化演变反应 (OER). 这种方法提供了一种可扩展的方法,用于高效,具有成本效益的催化剂开发.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 非高贵过渡金属氧化物对于具有成本效益的氧化演化反应 (OER) 是至关重要的.
- 对于这些氧化物,常规的注方法往往会导致不可预测的注部位和相位分离.
- 精确控制异质原子注对于优化催化剂性能和稳定性至关重要.
研究的目的:
- 开发一个原子精确的3D过渡金属氧化物的注策略.
- 研究均对Fe2O3的OER性能和稳定性的影响.
- 阐明催化活性和耐久性增强背后的机制.
主要方法:
- 基于格子匹配原理的界面扩散策略的开发,以实现均的异质原子兴奋剂.
- 使用Fe2O3作为模型合成原子精确的配合氧化铁 (FeCrO3).
- 在1.0MKOH中对FeCrO3进行OER活性和稳定性测试的电化学表征.
主要成果:
- 与Fe2O3 (438 mV) 相比,FeCrO3的超电位显著降低 (258 mV在10 mA cm-2).
- 催化剂表现出极好的长期稳定性,运行超过1100小时,性能降低最小.
- 订购的Cr兴奋剂诱导了电子流,稳定了活性Fe2+物种,并加速了氧化还原循环,促进了水的激活.
结论:
- 通过界面扩散进行原子精确注是增强OER催化剂的有效策略.
- 通过修改电子结构和反应机制,在Fe2O3中注射Cr提高了催化活性和稳定性.
- 这种可扩展的兴奋剂方法可以扩展到其他过渡金属氧化物,突显了精确的表面工程的重要性.
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