气体诱导的前向偏差双极膜的结构损伤 CO2 电解通过快速X射线断层学研究
Robert Fischer1, Matthieu A Dessiex1,2, Federica Marone3
1Electrochemistry Laboratory, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
ACS applied energy materials
|May 17, 2024
概括
前向偏倚的双极膜 (BPM) CO2合电解显示出有希望的结果,但受到不稳定的影响. 气态二氧化碳的形成会导致膜和催化剂层受损,影响长期生存能力.
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:
- 前向偏差双极膜 (BPM) CO2合电解 (CO2ELY) 为离子交换膜CO2ELY提供了替代方案,旨在解决盐沉和CO2交叉问题.
- 提高BPM-CO2ELY的运行稳定性对于其实际实施和广泛采用至关重要.
研究的目的:
- 研究BPM-CO2ELY电化学电池在运行过程中的结构动力学和降解机制.
- 阐明二氧化碳气体在损伤膜和阳极催化剂层 (CL) 的作用.
主要方法:
- 利用时间分辨率的X射线断层显微镜观察现场结构变化.
- 采用先进的4D机器学习细分来进行膜和CL损伤的定量分析.
- 将实验观察结果与二氧化碳运输模型进行比较.
主要成果:
- 鉴定了由于碳酸盐离子重组作为主要损伤源的BPM交叉点的气态CO2形成.
- 观察到CL中不可逆转的孔形成和BPM结处的膜分层,特别是在更高的电流密度下.
- 降解发生的速度很快,在几十分钟内,在整个活跃区域.
结论:
- 气态二氧化碳的积累和压力增加是BPM-CO2ELY降解的主要驱动因素.
- 尽管观察到结构损坏,但对电化学性能的直接影响并没有立即明显.
- 对于BPM-CO2ELY长期稳定性不佳的根本原因需要进一步调查.
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