在阳极催化剂层中优化离子体分布,以实现稳定的质子交换膜水电解
Han Liu1,2, Xinhui Wang1,2, Kejie Lao1,2
1State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Advanced materials (Deerfield Beach, Fla.)
|April 25, 2024
概括
在质子交换膜水电解 (PEMWE) 中的降解是由阳极催化剂层 (ACL) 中的离子体运动引起的. 优化离子体分布显著减少了PEMWE衰变,为更便宜的气生产铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 质子交换膜水电解 (PEMWE) 对于可持续的生产至关重要,但在成本,效率和耐用性方面面临挑战.
- 贵金属催化剂和有限的运行寿命在很大程度上导致了PEMWE系统的高成本.
研究的目的:
- 确定和阐明PEMWE中关键的降解机制,与阳极催化剂层 (ACL) 内的离子体动力学有关.
- 研究 ACL 微结构随时间的推移而发生的机械降解及其对 PEMWE 性能的影响.
- 建立催化剂油墨特性,离子体分布和ACL降解之间的相关性,以改善PEMWE的寿命.
主要方法:
- 对阳极催化剂层 (ACL) 的微结构分析,以观察离子体迁移和孔隙占用.
- 催化剂油墨配方与由此产生的ACL内的离子体分布之间的相关性研究.
- 在特定操作条件下 (2.0 A cm−2 和 80 °C) 对具有优化离子体分布的 PEMWE 电池进行性能测试.
主要成果:
- 发现了一种新的降解机制:离子体迁移并占据ACL中的微孔,特别是在ACL/PTL接口,阻碍反应物/产物运输.
- 局部胀,爬行和离子体的迁移导致了机械降解的ACL微观结构.
- 优化的离子体分布,在ACL/PTL接口的积累减少,在ACL/PEM接口的丰富,降低了降解率的三倍.
结论:
- 在ACL中的离子体的动态行为是PEMWE降解的关键因素.
- 控制ACL内的离子体分布,受催化剂油墨特性的影响,可以减轻降解.
- 这项研究为实现更持久,更具成本效益的PEMWE系统,以低成本生产气提供了一条道路.
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