电离体诱导的界面疏水微环境 促进电化学CO2降低中的C-C合
Xinzhe Yang1, Haowen Ding1, Shunning Li1
1School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518000, China.
Journal of the American Chemical Society
|February 16, 2024
概括
金属离子和界面水显著影响电化学二氧化碳降解 (CO2RR) 到C2产物. 较大的阴离子通过创建疏水环境来促进C-C合,抑制不必要的C1通路.
科学领域:
- 电化学
- 材料科学
- 计算化学
背景情况:
- 电化学二氧化碳减排反应 (CO2RR) 对二氧化碳产品至关重要.
- 优化电双层 (EDL),特别是接口水和离子类型,是增强C-C合的关键.
- 对这些对CO2RR的界面影响的原子层次理解落后于实验发现.
研究的目的:
- 在CO2RR过程中研究表面水和金属离子对C-C合的联合影响.
- 阐明控制Cu(100) 电极/电解质界面上的阴离子-水-吸附物相互作用的原子机制.
主要方法:
- 使用初始分子动力学 (AIMD) 模拟.
- 采用受约束的MD和缓慢增长的C-C合模式.
- 聚焦在Cu 100) 电极/电解质接口上.
主要成果:
- 通过键稳定水-吸附物和减少的C-C合自由能量之间观察到直接的相关性.
- 较大的阴离子 (例如,K+) 溶解并与*CO+*CO中间体协调,部分取代了水的稳定作用.
- 较大的离子会形成局部的疏水区域,阻碍水接近吸附的*CO,并抑制C1副产品的形成.
结论:
- 该研究显示,较大的子主要通过防止CO化到C1产物来促进CO2RR中的C-C合.
- 对阴离子-水-吸附物相互作用的原子洞察为优化电解质和EDL提供了有效的CO2RR的途径.
- 这项工作弥合了实验观测和对CO2RR界面效应的原子层次理解之间的差距.
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