在酸性CO2减少中通过并联电催化剂有效的多碳形成
Yuanjun Chen1, Xiao-Yan Li1, Zhu Chen1
1Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada.
Nature nanotechnology
|November 23, 2023
概括
研究人员开发了一种双催化剂系统,以高效的电化学方法将二氧化碳 (CO2) 减少为多碳产品. 这种并行方法提高了选择性,并实现了可持续化学合成的高单通碳效率.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 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:
- 在酸性介质中电化学减少二氧化碳 (CO2) 提供高单通碳效率.
- 进化反应 (HER) 与二氧化碳减少竞争,降低选择性.
- 多碳 (C2+) 产品的形成需要产生CO和随后的C-C合,需要不同的催化剂特性.
研究的目的:
- 将CO2到C2+反应分成两个不同的步骤:CO2到CO和CO到C2+.
- 开发一个双层的双联催化剂系统,以实现高选择性和高效率的二氧化碳电还原.
- 为了克服在单一催化剂中实现二氧化碳减排和C-C合所需的独特催化剂性质的挑战.
主要方法:
- 设计了一种两层并联电极系统.
- 第一个层使用原子分散的甲酸来选择性减少CO2到CO.
- 第二层采用Cu纳米催化剂与Cu-ionomer接口进行增强的C-C合.
主要成果:
- 协奏电极在800 mA cm−2.2.2时实现了61%的C2H4和82%的C2+法拉代效率.
- 该系统针对单通用利用进行了优化,并证明了90%±3%的单通用碳效率.
- 同时达到55%±3%的C2H4和76%±2%的C2+法拉代效率在800 mA cm−2时,二氧化碳的流速为2毫升min−1.1,同时达到55%±3%的C2H4和76%±2%的C2+法拉代效率.
结论:
- 将CO2-to-C2+反应解成使用双联催化剂的连续步骤是一个有效的策略.
- 原子分散的酸和Cu纳米催化剂系统显著提高了选择性和效率.
- 这种方法可以实现高单通碳效率和大量的C2+产品产量,用于二氧化碳的电还原.
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