恒定变化:探索氧气演化反应的动态催化和酸化中物质的转化
Jane Edgington1, Neil Schweitzer1,2, Selim Alayoglu2
1Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3113, United States.
Journal of the American Chemical Society
|June 23, 2021
概括
在质子交换膜 (PEM) 电解剂中用于氧化演化反应 (OER) 的矿具有前景. 这项研究揭示了SrIr0.8Zn0.2O3中OER诱导的金属到绝缘体的转变,影响了水电解的催化剂稳定性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 基于的矿是质子交换膜 (PEM) 电解剂中氧化演化反应 (OER) 的有希望的催化剂.
- 在反应条件下更深入地了解它们的动态行为对于设计稳定和高效的催化剂至关重要.
研究的目的:
- 在酸性OER条件下研究SrIr0.8Zn0.2O3矿的动态性质.
- 阐明其性能和稳定性的机制.
主要方法:
- 电化学实验与现场和现场X射线吸收光谱 (XAS) 结合.
- 在酸性环境中的电化学循环过程中的材料变化分析.
主要成果:
- 循环使用时观察到OER活动的初始改善和Ir氧化状态的增加.
- 由于表面重组和结晶性变化,SrIr0.8Zn0.2O3经历了OER诱导的金属到绝缘体过渡 (MIT).
- 这种MIT与暴露在酸性和氧化条件中有关.
结论:
- 皮质矿中的OER诱导的MIT带来了新的稳定性挑战.
- 这一发现对于在未来设计用于PEM水电解的强大的 iridate 催化剂至关重要,补充已知溶解问题.
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