在酸性水氧化中稳定格子氧催化剂的氧化场所介导动态氧补充
Shaoxiong Li1, Sheng Zhao1, Sung-Fu Hung2
1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Journal of the American Chemical Society
|September 8, 2025
概括
研究人员开发了一种新的催化剂机制 (DORM),以改善水电解的氧化演化反应 (OER) 催化剂. 这种动态的氧气补充在酸性条件下提高了催化剂的耐用性和效率.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 质子交换膜水电解 (PEMWE) 需要在酸性介质中使用高效且持久的氧化演化反应 (OER) 催化剂.
- 目前的催化剂由于晶格氧耗尽和金属溶解而遭受不稳定.
研究的目的:
- 提出和验证动态补氧机制 (DORM) 用于稳定酸性OER电催化剂.
- 设计一种强大的,无贵金属的催化剂,
主要方法:
- 研究了一种氧性场所介导的动态氧补充机制 (DORM).
- 使用氧化剂来调节电子结构和界面特性.
- 通过在酸性电解质和PEMWE中进行超电位和耐久性测试来评估催化剂的性能.
主要成果:
- 优化的催化剂实现了289mV的低OER超电位.
- 经过证明的特殊耐用性:在酸性电解质中在10 mA cm-2下650小时,在PEMWE中在1 A cm-2下280小时.
- DORM机制积极补充格子中的氧气,增强催化剂的稳定性.
结论:
- 在OER中建立了动态晶格氧氧还原的机制框架.
- 为设计稳定,无贵金属的酸性OER电催化剂提供了合理的策略.
- 在水电解应用中,DORM方法显著提高了催化剂的耐用性.
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