特定地点的金属支相互作用,以切换单个原子的活性,以进行氧气演化反应
Jie Wei1, Hua Tang1, Li Sheng1
1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 230026, Hefei, Anhui, P. R. China.
Nature communications
|January 16, 2024
概括
更强的金属支相互作用 (MSI) 显著提高了氧化演化反应的单原子Ir催化剂性能. 电化学沉积精确控制MSI,通过优化电子特性和中间吸附来增强催化活性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 金属支相互作用 (MSI) 对单原子催化剂 (SAC) 的电子特性和性能至关重要.
- 现有的MSI调方法通常涉及支变化或损害催化剂稳定性.
研究的目的:
- 开发一种方法,用于精确调节位于Ni层双氧化物 (Ni-LDH) 上的Ir SAC中的特定地点的MSI.
- 为了研究受控MSI对氧演化反应 (OER) 活动的影响.
主要方法:
- 电化学沉积 (阴极和阳极) 用于将单个原子固定在Ni-LDH上.
- 描述MSI强度和位置 (例如,三倍空洞与氧气空缺位).
- 用于OER性能评估的电催化测试.
主要成果:
- 阴极沉积导致三倍空心部位的强烈MSI;阳极沉积导致氧空位部位的弱MSI.
- 与MSI较弱的SAC相比,具有强MSI的SAC表现出19.5倍的质量活性和5.2倍的OER内在活性.
- 机制研究表明,强烈的MSI增强了Ir位点的活动,并优化了中间吸附.
结论:
- 电化学沉积提供了一条精确的路线来调整SAC中的特定站点MSI.
- 更强大的MSI通过修改电子结构和优化吸附,显著提高了OER的Ir SACs的催化性能.
- 这项工作为增强的电催化应用提供了对合理催化剂设计的见解.
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