使用比醇作为电解质添加剂来控制电化学CO2中的界面环境2 减少银
Anil Kumar Sihag1,2, Florian Altmann1, Alper T Celebi1
1Institute of Applied Physics, Vienna University of Technology, 1040 Vienna, Austria.
概括
将醇添加到电解质溶液中,通过提高二氧化碳选择性和减少演变来增强二氧化碳 (CO2RR) 的电化学减排. 分子动力学模拟显示,比醇改变了电极接口,有利于CO2RR性能.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 计算化学计算化学
背景情况:
- 电解质添加剂对于优化二氧化碳 (CO2RR) 的电化学减排至关重要.
- 了解添加效应的分子机制,特别是气体扩散电极 (GDE),仍然具有挑战性.
- 醇对电极/电解质接口上的CO2RR的影响需要进一步研究.
研究的目的:
- 通过使用GDE,研究位醇作为电解质添加剂对CO2RR的影响.
- 阐明索比对CO2RR和演化反应 (HER) 的影响背后的分子机制.
- 探索比醇对电极/电解质接口组成和结构的影响.
主要方法:
- 电化学减少二氧化碳 (CO2RR) 实验使用气体扩散电极 (GDE) 与银纳米粒子催化剂.
- 将100mM索尔比托尔添加到水性电解质中.
- 分子动力学 (MD) 模拟用于分析电极/电解质接口组成和离子-分子相互作用.
主要成果:
- 添加醇增加了CO法拉代克效率从79%提高到90%,并将HER从15%降低到5%在98mA·cm-2.2时.
- MD模拟显示,在电极接口附近的二碳酸盐度与sorbitol的度下降.
- 观察到K+离子和CO2分子之间的加强协调,可能稳定CO中间体.
结论:
- 醇有效地提高了CO2RR的性能,并抑制了GDE中的HER.
- 这些有益效应归因于sorbitol对电极/电解质接口的影响,减少二碳酸盐和促进CO2激活.
- 这项研究突出了非离子添加剂在调整电催化接口以改善二氧化碳转化中的潜力.
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