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溶剂对离子体自组合的影响:从分子形态学到催化剂层性能
Daozeng Yang1, Tiankuo Chu1, Yuqing Guo1
1School of Automotive Studies and Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China.
ACS applied materials & interfaces
|December 25, 2025
概括
溶剂成分控制燃料电池催化剂中的离子体层结构. 优化的结构提高了性能,并减少了质子交换膜燃料电池 (PEMFC) 中的中毒风险.
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:
- 催化剂结合的离子层 (CBIL) 对于质子交换膜燃料电池 (PEMFC) 的性能至关重要.
- 在CBIL中的离子体表现出复杂的溶解行为和相隔结构.
- 了解溶剂对CBIL架构的影响是优化电极性能的关键.
研究的目的:
- 阐明溶剂的组成和极性如何影响CBIL内的离子体溶解和相位分离.
- 调查这些变化对CBIL架构,泥性质和电极性能的影响.
- 为了将CBIL特征与质子交换膜燃料电池极化性能相关联.
主要方法:
- 在不同的溶剂条件下对离子体溶解直径和相隔结构的分析.
- 在催化剂聚合物和泥网络异质性上对CBIL架构的表征.
- 测量涂层中的孔分布和电极极化性能.
- 测量泽塔电位以评估表面特性和聚合物间的相互作用.
主要成果:
- 富含水的溶剂导致离子体的形态崩,减少排斥体积,并限制了 -SO3H 组的扩展.
- 观察到较密集的CBIL结构具有高度负的泽塔电位 (<-70 mV),从而削弱了集成网络的强度.
- 主链的崩和侧链的卷曲降低了表面硫含量,减轻了中毒.
- 升高的CBIL zeta潜力增强了聚合物间的排斥力,抑制了过度聚合,改善了极化性能.
结论:
- 溶剂组成通过控制离子体溶解和相分离,对CBIL架构和特性进行了批判性调节.
- 优化的CBIL结构,由溶剂选择驱动,显著提高PEMFC电极极化性能.
- 这些发现为缓解中毒和通过定制的离子体层设计提高燃料电池耐用性提供了一条途径.
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