Two-Stage Microporous Layers with Gradient Pore Size Structure for Improving the Performance of Proton Exchange Membrane Fuel Cells

• DOI: 10.3390/polym15122740
• Publication Date: 2023-06-20T05:59:30Z
• Authors: Chongxue Zhao; Haihang Zhang; Zheng Huang; Meng Zhao; Haiming Chen; Guangyi Lin
• Keywords: Gaseous diffusion; Water Transport

In this paper, we report the preparation of a gas diffusion layer (GDL) with different gradient pore size structures. The structure microporous layers (MPL) was controlled by amount pore-making agent sodium bicarbonate (NaHCO3). We investigated effects two-stage MPL and structures in on performance proton exchange membrane fuel cells (PEMFC). conductivity water contact angle tests showed that GDL had outstanding good hydrophobicity. results distribution test indicated introducing altered increased capillary pressure difference within GDL. Specifically, there an increase 7–20 μm 20–50 ranges, which improved stability transmission cell. maximum power density GDL03 37.1% at 40% humidity, 38.9% 60% 36.5% 100% humidity when compared to commercial GDL29BC hydrogen-air environment. design ensured between carbon paper changed from initially abrupt state smooth transition state, significantly management capabilities PEMFC.