碳化离子交换膜燃料电池性能下降的原因
Qihao Li1, Mihail R Krumov1, Meixue Hu1
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, United States.
Journal of the American Chemical Society
|November 25, 2024
概括
在离子交换膜燃料电池 (AEMFC) 中的碳化通过阻碍阳极氧化反应 (HOR) 来显著阻碍性能. 这是由于/离子体界面上的障碍,而不是离子电阻的增加.
科学领域:
- 电化学
- 材料科学
- 能源转换
背景情况:
- 阳离子交换膜燃料电池 (AEMFC) 是传统燃料电池的一个有希望的替代品.
- 环境二氧化碳通过不太了解的机制降低了AEMFC的性能.
- 性聚合物电解质 (APEs) 缓解了一些问题,但没有碳化效应.
研究的目的:
- 阐明AEMFC由于碳化而导致的性能损失的机制.
- 量化碳化对离子电阻和电极运动的影响.
- 在碳化后调查催化剂/离子体界面的变化.
主要方法:
- 包括电化学阻抗光谱和试验在内的多模式检测.
- 控制的阳极和阴极碳化实验.
- 电化学石英晶体微平衡 (EQCM) 分析Pt/离子体接口.
主要成果:
- 增加的离子电阻使电压下降最小,特别是在高电流密度下.
- 碳化显著阻碍了阳极氧化反应 (HOR) 动力学,减少了它们的数量.
- 经过碳化后,EQCM研究揭示了在Pt/离子体接口上的双层重排障,这解释了运动减速.
结论:
- 碳化导致的AEMFC性能损失的主要原因是抑制阳极上的HOR动力学.
- 催化剂/离子体接口上的障碍物显著影响HOR动力学.
- 这些发现为APE提供了基本的见解,并指导了AEMFC未来的材料开发.
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