在催化剂层中构建强大的3D离子体网络,以实现稳定的水电解,用于生产绿色气
Han Liu1,2, Yang Yang1,2, Jiawei Liu1,2
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.
质子交换膜水电解器 (PEMWE) 的寿命受到阳极催化剂层 (ACL) 降解的限制. 我们通过在ACL中创建3D离子体网络来提高PEMWE的耐用性,提高机械稳定性和质量转移.
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:
- 质子交换膜水电解器 (PEMWE) 对于绿色生产至关重要.
- 由于阳极催化剂层 (ACL) 的寿命有限,PEMWE的广泛采用受到阻碍.
- 一个关键的降解机制涉及离子体迁移和ACL内的胀,阻断质量转移通道.
研究的目的:
- 识别和理解PEMWE ACLs中的一个关键降解机制.
- 制定一种提高ACL机械稳定性和耐用性的策略.
- 改善小微企业的运营寿命.
主要方法:
- 液相原子力显微镜 (AFM) 用于直接观察ACL内的离子体分布和行为.
- 在不同的水/温度环境中使用交替处理来修改ACL微观结构.
- 经过处理的ACL的机械性能和运行性能在50平方厘米的PEMWE中进行了评估.
主要成果:
- 观察到离子体在ACL中随机分布,由于胀和迁移而占据质量转移通道.
- 交替处理成功形成了三维离子体网络 (3D INs),使微观结构的机械强度增加了三倍.
- 在ACL中开发的3D INs导致PEMWE寿命提高了19倍.
- 实现了低降解率 (3.0μV/h在80°C) 和高电流密度 (2.0A/cm2).
- 预计寿命为8万小时,接近2026年能源部的目标.
结论:
- 该ACL的机械稳定性对于PEMWE的耐用性至关重要.
- 形成3D离子体网络是提高ACL机械强度和防止离子体迁移的有效策略.
- 这种方法为设计和开发高耐久性PEMWE提供了一条通往高效气生产的通道.
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