Slip-Enhanced Transport by Graphene in the Microporous Layer for High Power Density Proton-Exchange Membrane Fuel Cells,The Journal of Physical Chemistry Letters

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Slip-Enhanced Transport by Graphene in the Microporous Layer for High Power Density Proton-Exchange Membrane Fuel Cells
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2023-08-28 , DOI: 10.1021/acs.jpclett.3c01661
Ye Liu ₁ , Ningran Wu _{1,

2,

3,

4} , Haiou Zeng _{2,

3} , Dandan Hou ₁ , Shengping Zhang _{1,

2,

3,

4} , Yue Qi ₁ , Ruizhi Yang ₅ , Luda Wang _{1,

2,

3,

4}

Affiliation

Proton exchange membrane (PEM) fuel cells are a promising and environmentally friendly device to directly convert hydrogen energy into electric energy. However, water flooding and gas transport losses degrade its power density owing to structural issues (cracks, roughness, etc.) of the microporous layer (MPL). Here, we introduce a green material, supercritical fluid exfoliated graphene (s-Gr), to act as a network to effectively improve gas transport and water management. The assembled PEM fuel cell achieves a power density of 1.12 W cm^–2. This improved performance is attributed to the reduction of cracks and the slip of water and gas on the s-Gr surface, in great contrast to the nonslip behavior on carbon black (CB). These findings open up an avenue to solve the water and gas transport problem in porous media by materials design with low friction and provide a new opportunity to boost high power density PEM fuel cells.

中文翻译：

高功率密度质子交换膜燃料电池微孔层中石墨烯的滑移增强传输

质子交换膜（PEM）燃料电池是一种有前途且环保的装置，可将氢能直接转化为电能。然而，由于微孔层（MPL）的结构问题（裂纹、粗糙度等），水驱和气体传输损失降低了其功率密度。在这里，我们引入了一种绿色材料，超临界流体剥离石墨烯（s-Gr），作为网络有效改善气体运输和水管理。组装好的PEM燃料电池的功率密度达到1.12 W cm ^–2。这种性能的提高归因于 s-Gr 表面裂纹的减少以及水和气体的滑移，这与炭黑 (CB) 上的防滑行为形成鲜明对比。这些发现开辟了一条通过低摩擦材料设计解决多孔介质中水和气体传输问题的途径，并为提高高功率密度质子交换膜燃料电池提供了新的机会。

更新日期：2023-08-28

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