Department of Mechanical Engineering, Tokyo Metropolitan University, 1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan; HySA/Catalysis, Department of Chemical Engineering, University of Cape Town, Private Bag X3, Rondebosch, Cape Town 7701, South Africa
Tanaka, S., Department of Mechanical Engineering, Tokyo Metropolitan University, 1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan, HySA/Catalysis, Department of Chemical Engineering, University of Cape Town, Private Bag X3, Rondebosch, Cape Town 7701, South Africa; Shudo, T., Department of Mechanical Engineering, Tokyo Metropolitan University, 1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan
Flooding at the cathode is the greatest barrier to increasing the power density of polymer electrolyte fuel cells (PEFCs) and using them at high current densities. Previous studies have shown that flooding is caused by water accumulation in the gas diffusion layer, but only a few researchers have succeeded in overcoming this issue. In the present study, microcoils are used as the gas flow channel as well as the gas diffuser directly on the microporous layer (MPL), without using a conventional carbon-fiber gas diffusion layer (GDL), to enable flood-free performance. The current-voltage curves show flooding-free performance even under low air stoichiometry. However, the high-frequency resistance (HFR) in this case is slightly higher than that in grooved flow channels and GDLs. This is due to the differences in the electron conduction path, and the in-plane electron conductivity in the MPL is the key to enhancing the microcoil fuel cell performance. © 2013 Elsevier B.V. All rights reserved.
Cathode flooding; Current voltage curve; Electron conductivity; Fuel cell performance; Gas diffusion layers; High current densities; Microcoil; Polymer electrolyte fuel cells; Cathodes; Channel flow; Data communication equipment; Diffusion in gases; Flow fields; Flow of gases; Forced convection; Fuel cells; Polyelectrolytes; Polymers; Stainless steel; Water management; Floods