具有梯度孔尺寸结构的两级微孔层,用于提高质子交换膜燃料电池的性能
Chongxue Zhao1, Haihang Zhang1, Zheng Huang1
1College of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China.
Polymers
|June 28, 2023
概括
这项研究开发了一种新的气体扩散层 (GDL),用于质子交换膜燃料电池 (PEMFCs). 这项创新通过优化水和气体管理,显著提高了燃料电池的性能.
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:
- 质子交换膜燃料电池 (PEMFC) 需要高效的气体扩散层 (GDL) 以获得最佳性能.
- 控制微孔层 (MPL) 的孔隙结构对于在GDL中管理水和气体运输至关重要.
研究的目的:
- 准备和描述具有渐变孔径结构的GDL,使用不同数量的二碳酸 (NaHCO3) 作为孔隙形成剂.
- 调查两阶段MPL及其梯度孔结构对PEMFC性能的影响.
主要方法:
- 在MPL中使用NaHCO3.3制造具有受控孔结构的GDL.
- 评估GDL属性,包括导电性和水接触角度.
- 孔径分布和毛细血管压力的分析.
- 在各种湿度条件下对PEMFCs与开发的GDL进行性能测试.
主要成果:
- 开发的GDL显示出出色的导电性和疏水性.
- 引入NaHCO3修改的孔径分布,增加毛细血管压力和改善水/气体传输稳定性.
- 与商业GDL相比,GDL03样本显示最大功率密度显著增加 (40%湿度为37.1%,60%湿度为38.9%,100%湿度为36.5%).
- 梯度MPL设计促进了孔径尺寸的平稳过渡,提高了水和气体管理.
结论:
- 在MPL中的渐变孔径结构有效地提高了PEMFC的性能.
- 有梯度孔结构的优化GDL提供了增强的水和气体管理,导致更高的功率密度.
- 这种方法为开发用于燃料电池应用的先进GDL提供了一个有希望的策略.
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