酸性对进化和CO2减少在黄金电极上的竞争的作用
Mariana C O Monteiro1, Federico Dattila2, Núria López2
1Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands.
Journal of the American Chemical Society
|December 28, 2021
概括
多价对黄金的二氧化碳电还原 (CO2RR) 和演变有显著的影响. 酸性和水化影响水的降解和CO2RR活动,特定的酸促进中间稳定,以增强CO的产生.
科学领域:
- 电化学
- 催化剂
- 表面科学
背景情况:
- 二氧化碳电降低 (CO2RR) 提供了可持续的燃料和化学品的途径.
- 金属在CO2RR中的作用至关重要,但对多价物种的理解较少.
- 现有的研究主要集中在金属子上.
研究的目的:
- 研究各种多价金属对CO2RR和的演变的影响.
- 阐明阴离子影响反应路径和动力学的机制.
- 确定促进CO2RR选择性和活动的阳离子特性.
主要方法:
- 在pH3下对多晶金进行电化学研究.
- 金属离子的系统变化 (Li+, Cs+, Be2+, Mg2+, Ca2+, Ba2+, Al3+, Nd3+, Ce3+).
- 具有明确电场的初始分子动力学模拟.
主要成果:
- 在性表面的pH值下通过水解进行第二次质子降解.
- 水还原活性与酸性相关,有利于低化三价酸子.
- 在高超电位下,CO2RR活性取决于离子顺序:Ca2+ < Li+ < Ba2+ < Cs+.
- 在Helmholtz外平面积聚非酸性离子,促进局部效应.
- 酸性离子 (Nd3+,Al3+) 增强了水分离的动力学.
- 特定的 (Cs+, Ba2+, Nd3+) 稳定了*CO2-中间体,促进了CO的形成.
结论:
- 多价离子在CO2RR中起着复杂的作用,影响二氧化碳减少和竞争的演变.
- 酸性,水化和界面积累是控制催化性能的关键因素.
- 优化阴离子选择和电解质条件可以提高CO2RR效率和选择性.
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