原子层面的洞察力,介于子介导的电催化C-N合机制在Cu模型催化剂上的洞察力
Tongwei Wu1, Changlu Zhao1, Wei Chen1,2
1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
The journal of physical chemistry letters
|February 16, 2026
概括
电解质中的离子 (K+) 可实现单步电催化C-N合机制,显著改善尿素的产生. 这与没有K+的两步路径形成鲜明对比,突出了电解质.
科学领域:
- 不同质的催化剂.
- 电触媒溶解是一种电触媒.
- 表面化学 表面化学
背景情况:
- 电催化C-N合对于合成高价值化学品至关重要.
- 电解质在C-N合机制中的作用尚不清楚.
- 优化催化剂活性位点是主要重点,忽视了电解质的影响.
研究的目的:
- 为了研究金属离子 (Li+,Na+,K+) 在Cu/电解质接口上的电催化C-N合的影响.
- 阐明受电解质组成影响的C-N合的机制.
- 通过电解质调节来提高尿素生产效率.
主要方法:
- 缓慢增长的分子动力学模拟与明确的溶解模型.
- 微分电化学质谱 (DEMS) 用于中间检测.
- 电化学测量以确定法拉第克效率和生产率.
主要成果:
- K+ 允许使用 0.68 eV 的屏障进行一阶段的 C-N 合和化机制,形成 *OC-NOH 中间体.
- 在K+的存在下,DEMS检测到*OC-NOH中间体.
- 在没有K+的情况下,观察到具有更高屏障 (1.0 eV) 的两步机制,并且没有检测到中间体.
- K+ 增强丰富和电荷转移,激活 *NO 进行并发合和化.
- 实现了67.25%的法拉代克效率和21.02 mmol g-1 h-1尿素生产率在0.1 M KHCO3.3中的Cu上.
结论:
- 用K+进行简单的电解质调制可以显著提高电催化C-N合效率.
- 由K+促进的一步机制提供了更有效的尿素合成途径.
- 这项研究提供了对异质催化中的电解质效应的基本见解,为优化C-N合反应铺平了道路.
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