定制催化剂/离子体接口,用于高耐久性电极的质子交换膜燃料电池
Dongqing Zhang1,2, Ke Ye1, Xiaojin Li1,2,3
1Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences, Qingdao ,Shandong 266101, China.
ACS applied materials & interfaces
|September 25, 2023
概括
优化催化剂油墨粘度可以提高质子交换膜燃料电池电极的耐用性. 调整异醇和二甘溶剂比率可以增强催化剂/离子体接口,减少降解.
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:
- 由于电极耐用性问题,质子交换膜燃料电池 (PEMFC) 面临商业化障碍.
- 催化剂油墨配方,特别是催化剂/离子体接口,对于提高电极寿命至关重要.
研究的目的:
- 为了研究溶剂粘度和催化剂/离子体接口特性之间的定量关系,以提高PEMFC电极耐用性.
- 为了确定催化剂油墨的最佳溶剂组成,最大限度地提高电极寿命.
主要方法:
- 使用不同粘度 (η) 的异醇 (IPA) 和二烯糖醇 (DPG) 的非水性混合物.
- 在使用不同溶剂比率制造的电极上进行加速应力测试 (AST).
- 采用分子动力学 (MD) 模拟和19F核磁共振 (NMR) 光谱来分析离子体分散和接口结构.
主要成果:
- 观察到溶剂粘度对电极耐用性的值效应.
- 2:6的最佳IPA:DPG比 (η = 27.00cP) 产生了最高的电极耐用性,最大限度地减少ECSA损失和细胞潜在衰变.
- 优化的粘度促进了有利的催化剂/离子体接口,减少了碳腐蚀和溶解.
结论:
- 溶剂粘度是调整PEMFC电极中的催化剂/离子体接口的一个关键参数.
- 调节粘度会影响离子体的分散和移动性,从而提高电极的耐用性.
- 这些发现为设计更强大的PEMFC电极提供了途径,通过精确控制催化剂油墨特性.
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