期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 46, 期 35, 页码 18615-18629出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.03.029
关键词
Proton exchange membrane fuel cell& nbsp; (PEMFC); Gas diffusion layer (GDL); Substrate; Microporous layer (MPL); MPL penetration; Capillary pressure gradient
资金
- KOSEF/SNU-IAMD
- Industrial Strategic Technology Development Program e Development of high durability, high rigid gas diffusion layer for medium and large commercial vehicles - Ministry of Trade, Industry & Energy (MOTIE, Korea) [20011688]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [NRF-2019R1A4A1025848]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20011688] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigated the effects of ratio variation in the substrate and MPL penetration region on PEMFC performance, finding the optimal ratios for MPL penetration and overall performance. An excessively low substrate ratio can lead to water flooding and hinder gas supply.
A gas diffusion layer (GDL) facilitates the diffusion of reactant gas and the discharge of the generated water. The GDL performs various functions, such as conducting heat and electrons generated by electrochemical reactions and providing mechanical support for the catalyst layer. In this study, the effects of ratio variation in the substrate and microporous layer (MPL) penetration region on the proton exchange membrane fuel cell (PEMFC) performance were investigated. Furthermore, the reasons for these performance tendencies are explained based on the thermogravimetric analysis, contact angle, scanning electron microscopy, mercury porosimetry, electrical resistance, electrochemical impedance spectroscopy, and capillary pressure gradient. The experimental results indicate that the MPL penetration ratio within 15-20% of the total GDL thickness and the combined ratio of the MPL and MPL penetration within 35-40% is the best for the overall PEMFC performance. In addition, when the substrate ratio is excessively low, water flooding substantially occurs in the substrate, and this accumulated water functions as a back pressure, causing severe capillary condensation in the MPL penetration region and thus depriving the supply of the reactant gas. (c) 2021 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
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