碳黑在零间隙CO2电解中支持Ag纳米粒子转化为CO,从而实现了高质量活性
Khaled Seteiz1,2, Josephine N Häberlein1,2, Philipp A Heizmann1,2
1Electrochemical Energy Systems, IMTEK - Department of Microsystems Engineering, University of Freiburg Georges-Koehler-Allee 103 79110 Freiburg Germany severin.vierrath@imtek.uni-freiburg.de.
RSC advances
|June 23, 2023
概括
碳黑上的银纳米粒子以高效率催化二氧化碳的电还原到二氧化碳. 性能独立于碳支,这表明PTFE结合电极的质量传输限制.
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
- 催化剂是一种催化剂.
背景情况:
- 电化学减少二氧化碳 (CO2) 是可再生能源储存和化学生产的一个有希望的途径.
- 开发高效和稳定的催化剂对于推进二氧化碳电还原技术至关重要.
研究的目的:
- 研究在各种碳材料 (Ag/C) 上支的银纳米粒子作为二氧化碳电还原到一氧化碳 (CO) 的催化剂.
- 评估不同碳支物和电解质组合对催化剂性能和稳定性的影响.
主要方法:
- 在Super P,Vulcan和Ketjen黑色碳支上合成Ag/C催化剂,使用氨酸作为链接剂.
- 气体扩散电极的制造和在零间隙电解器中的表征.
- 在不同电流密度和电解质条件下进行电化学测试 (0.1M KOH与0.1M CsOH).
主要成果:
- 所有的Ag/C催化剂都表现出高电压,质量和法拉达效率 (>80%) 到200mA cm-2.
- 使用IrO2阳极,在2.95V时获得了部分CO电流密度为196mA cm-2和质活性为3920mA mg-1.
- 切换到0.1M CsOH电解质使得在300 mA cm-2下对CO的法拉达效率达到90%,其质量活性高达5400 mA mg-1.
- 在0.1M CsOH的长期测试中,在300 mA cm-2.0下,在11小时内保持超过80%的CO法拉达效率.
结论:
- 减少二氧化碳的Ag/C催化剂的电化学性能并不显著依赖于碳支,这表明PTFE结合电极的催化剂动力学而不是质量传输限制.
- 与氧化相比,氧化电解质显著提高了催化剂性能和稳定性.
- 可能需要进一步的研究来探索具有离子体结合剂的电极中催化剂支的依赖性.
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