当地pH的直接成像揭示了CO2电解仪中的泡诱导混合
Lorenz M Baumgartner1, Aron Kahn1, Maxime Hoogland1
1Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.
ACS sustainable chemistry & engineering
|July 21, 2023
概括
这项研究可视化了二维二氧化碳电解器中的2D pH 概况,揭示了泡诱导的混合会影响效率. 研究结果表明,带有双极膜的气体电解剂对高电流作业充满希望.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 电化学二氧化碳 (CO2) 减少是可持续燃料和化学品生产的关键技术.
- 气体扩散电极通过优化二氧化碳质量转移来提高二氧化碳转化效率.
- 催化剂表面的局部pH极大地影响了二氧化碳减排中的产品选择性.
研究的目的:
- 为了可视化气体供应CO2电解器的二维pH档案,在一个气体供应的CO2电解器的催解体通道内.
- 调查泡诱导混合对pH值和法拉第效率的作用.
- 评估二氧化碳缓冲对催化剂层pH稳定性的影响.
主要方法:
- 运行光终身成像显微镜 (FLIM) 使用pH敏感染料.
- 在带有双极膜的气体供应CO2电解器中直接2DpH映射.
- 在不同电流密度的电化学测量 (-10到-100 mA cm-2).
主要成果:
- 气泡诱导的混合通过影响局部pH而显著影响法拉代的效率.
- 催化剂表面的pH值在较高电流密度 (-100 mA cm-2) 时仍然较低,这是由于向导.
- 从气体和溶解的CO2中缓冲CO2,防止气体扩散电极中的极端性条件.
结论:
- 带有双极膜和流动性阴解体的气体供应CO2电解器,可在高电流密度下稳定运行.
- 了解和控制当地的pH值对于优化二氧化碳减排效率和选择性至关重要.
- 这项工作提供了pH动态的直接可视化,为未来的电解器设计提供了可扩展的信息.
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