表面固定交叉连接的阴阳性多电解质使CO2通过无金属阴阳的酸性电解质减少
Hai-Gang Qin1, Yun-Fan Du1, Yi-Yang Bai1
1Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong, China.
Nature communications
|September 13, 2023
概括
通过使用无金属离子体的系统,提高了酸性电解质的电化学二氧化碳减排. 这种新的方法提高了效率和稳定性,同时减少了电解质泛滥,推进了二氧化碳利用战略.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 在酸性电解质中的电化学二氧化碳 (CO2) 减少提供了高的CO2利用效率.
- 酸性电解质中的酸虽然有益,但会导致碳酸盐沉,电解质泛滥和气体扩散电极 (GDE) 的pH漂移等问题.
- 现有的方法面临着稳定性和运行问题的挑战,原因是阴离子诱导的副作用反应和电极降解.
研究的目的:
- 开发一种无金属阴离子的酸性电解质系统,用于高效的电化学二氧化碳减排.
- 为了减轻与酸盐相关的问题,如电解质泛滥和pH不稳定.
- 在酸性介质中提高二氧化碳减排催化剂的稳定性和性能.
主要方法:
- 通过对催化剂涂上交联的多二二甲基化物来开发一种无金属阴离子的酸性电解质.
- 这种多电解质涂层提供了固定的阴离子位点来抑制质子 (H+) 运输和调节接口场.
- 在 1.0 pH 电解质的流电池设置中测试了白银 (Ag) 和 (In) 催化剂.
主要成果:
- 使用Ag催化剂实现了95 ± 3%的法拉第效率 (FE) 对于使用Ag催化剂的CO生产.
- 在使用In.催化剂生产甲酸时,获得了76 ± 3%的FE.
- 与电离子电解质相比,通过GDE的电解质洪水显著减少到2.5 ± 0.6%.
- 在 -200 mA·cm−2.2.的36个小时以上的运行中保持了高的CO生产FE (>80%).
结论:
- 无金属阴离子的策略有效地抑制了酸性CO2电还原中的电解质泛滥和pH漂移.
- 催化剂表面的固定电离子位点提高了二氧化碳减排的选择性和运行稳定性.
- 这种方法为稳定和高效的电化学二氧化碳在酸性介质中的利用提供了有希望的途径.
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