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来自9R-BaIrO3电催化剂的活性层结构的鉴定
Na Li1, Liang Cai1,2, Chao Wang1
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P.R. China.
Journal of the American Chemical Society
|October 25, 2021
概括
在 9R-氧化物上高活性的氧化物纳米粒子促进了酸中的氧化演化反应 (OER). 这种新催化剂的质活性比基准值高16倍,使酸性OER催化成为可能.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 基于的矿在酸性介质中显示出氧化演化反应 (OER) 催化的前景.
- 然而,低质活性和未确定的活性层结构限制了它们的应用.
- 开发高效稳定的酸性OER电催化剂对于能源转化技术至关重要.
研究的目的:
- 合成和表征高活性基酸OER的催化剂.
- 阐明在催化过程中的结构-活性关系和活性位点的演变.
- 提供对OER工程先进电催化剂的见解.
主要方法:
- 通过溶液化和酸处理在9R-BaIrO3 (IrO2/9R-BaIrO3) 上结的1nm IrO2纳米颗粒的合成.
- 电化学测量包括OER活动和超电位的测定.
- 使用扫描传输电子显微镜 (STEM),X射线吸收光谱 (XAS) 和X射线光电子光谱 (XPS) 的高级表征.
主要成果:
- 该IrO2/9R-BaIrO3催化剂达到168 A gIr-1的高质活性,比IrO2高16倍.
- 要达到10 mA cm-2的地球催化电流密度,需要230 mV的低超电位.
- 现场表征揭示了活性位点的演变为无形的Ir5+Ox物种,来自IrO6八面体剪切器,增强金属导电性.
结论:
- 由于具有高含量的无形Ir5+Ox物种和增强的导电性,设计的IrO2/9R-BaIrO3催化剂对酸性OER表现出卓越的性能.
- 这项研究提供了对矿电催化剂活性位点的动态演变的关键见解.
- 这项工作展示了设计高活性纳米催化剂的有希望的策略.
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