Journal
APPLIED ENERGY
Volume 149, Issue -, Pages 186-193Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2015.03.072
Keywords
Proton exchange membrane fuel cell; Gas diffusion layer; Substrate; Pore size gradient; Capillary pressure gradient; Water management
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Funding
- New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, Republic of Korea [20143010031880]
- Brain Korea 21 (BK21) PLUS
- SNU-Institute of Advanced Machines and Design (IAMD)
- SNU-Research Institute of Advanced Materials (RIAM)
- Korea Evaluation Institute of Industrial Technology (KEIT) [20143010031880] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The proton exchange membrane fuel cell (PEMFC) is one of the up-and-coming power sources for automotive vehicles. To generate a stable performance during driving, the PEMFC needs to achieve an optimized water management under various humidity conditions. Being the path for the two-phase flow of fuel, air, and water, the gas diffusion layer (GDL) is a critical component, which influences water balance. In this study, a pore size gradient structure is introduced in the substrate of a GDL to control the local capillary pressure gradient, which is the driving force of the water flux inside the PEMFC. Through measurements of steady-state performance, transient response, voltage instability and electrochemical impedance spectroscopy, it was found that the pore size gradient structure improves the cell performance regardless of the relative humidity conditions used (50% and 100%). Furthermore, it is possible to hold the water on the membrane for higher ion conductivity and drain it toward the channel to secure gas supply toward the catalyst layer. In addition, it was also confirmed that the structural change enhances the bending stiffness of the GDL. (C) 2015 Elsevier Ltd. All rights reserved.
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