在中介温度 (80°C-120°C) 的质子交换膜燃料电池中对氧气运输的实验和数值模拟研究
Jian Zhang1,2, Yunfei Zhang1, Zhengrui Xiao1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Membranes
|April 26, 2024
概括
通过了解在中间温度下氧气运输,提高了燃料电池效率. 温度上升会增加局部电阻,但会降低总电阻,反压会减轻性能损失.
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:
- 优化燃料电池性能需要了解膜电极组件 (MEA) 中的氧气运输机制.
- 中间温度操作 (80-120°C) 为燃料电池效率带来了独特的挑战和机会.
- 精确的氧气运输建模对于预测和改进燃料电池行为至关重要.
研究的目的:
- 在中介温度下调查MEA内的氧气运输规律.
- 分析影响氧气运输电阻的因素.
- 开发一种模型,以减轻由于氧气运输而导致的性能损失.
主要方法:
- 利用限制电流密度和电化学阻抗光谱来分析氧气传输电阻.
- 开发了一个三维多物理场稳定状态模型.
- 研究了温度,压力和奥斯瓦尔德成熟对运输现象的影响.
主要成果:
- 温度升高导致局部氧气运输阻力 (Rlocal) 因奥斯瓦尔德成熟而上升34%.
- 随着温度的上升,总运输阻力 (Rtotal) 降低了27.8%,至37.5%.
- 较高的逆压有效地减轻了氧气部分压力的下降,确保了细胞的性能.
结论:
- 温度通过奥斯瓦尔德成熟和扩散和反应性变化显著影响MEA内的氧气运输阻力.
- 随着温度的增加,MEA内的液态水积累量会减少,这对运输产生了积极的影响.
- 增加逆压是一种可行的策略,通过管理氧气部分压力,在中间温度下保持燃料电池性能.
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