表面含氧物种的机制促进了电催化CO2的减少
Zhanzhao Fu1, Yixin Ouyang1, Mingliang Wu1
1Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 21189, China.
Science bulletin
|March 13, 2024
概括
氧 (O2) 联合电解通过在铜催化剂上形成表面基 (*OH) 来促进二氧化碳 (CO2RR) 减少为有价值的多碳产物. 这增强了离子 (K+) 吸附,降低了C-C合障碍.
科学领域:
- 电触媒溶解是一种电触媒.
- 表面化学 表面化学
- 计算化学计算化学
背景情况:
- 含氧物种对于电催化CO2降解 (CO2RR) 至关重要,增强了多碳 (C2+) 产品的选择性.
- 氧气促进CO2RR的精确机制仍在争论中,这阻碍了催化剂的优化.
- 铜 (Cu) 催化剂在CO2RR方面受到广泛研究,但了解提高性能的因素是关键.
研究的目的:
- 阐明O2增强CO2RR超过Cu催化剂的机制.
- 为氧气在提高C2+产品选择性中的作用提供一个新的视角.
- 为合理设计基于Cu的催化剂提供洞察力,以实现高效的CO2转化.
主要方法:
- 采用理论模拟来研究CO2和O2对Cu的联合电解.
- 研究了含氧中间体,特别是基 (*OH) 的形成和作用.
- 分析了*OH对K+吸附和随后的反应途径的影响.
主要成果:
- O2联合电解迅速产生表面OH,导致Cu表面在还原条件下部分氧化.
- 表面*OH促进K+离子的准特异性吸附,增加它们的表面度.
- 吸附的K+离子降低C-C合障碍,促进CO化,增强C2+产品的形成.
结论:
- O2联合电解对于稳定表面OH至关重要,这推动了CO2RR中增强的C2+选择性.
- 拟议的机制解释了高电解质pH和氧气残留在氧化物衍生Cu (OD-Cu) 中的积极影响.
- 在还原条件下维持部分表面氧化是一种可行的策略,可以改善Cu催化剂上的C2+产品产量.
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