Optimisation of the Microporous Layer for a Polybenzimidazole‐Based High Temperature PEMFC – Effect of Carbon Content

Fuel Cells - Tập 10 Số 5 - Trang 770-777 - 2010
Justo Lobato1, Pablo Cañizares1, Manuel A. Rodrigo1, Diego Úbeda1, F. Javier Pinar1, José J. Linares1
1Department of Chemical Engineering, University of Castilla‐La Mancha, Av. Camilo Jose Cela, n 12. 13071, Ciudad Real, Spain

Tóm tắt

AbstractThis work aims at studying the role of the microporous layer (MPL) in electrodes prepared for high temperature PBI‐based PEMFC. The two main components of this layer are carbon black and a polymeric binder (Teflon). This work addresses the effect of the MPL carbon amount on the performance of a high temperature PEMFC. Thus, gas diffusion layers (GDLs) containing MPL with different carbon contents (from 0.5 to 4 mg cm–2) were prepared. Firstly, they were physically characterised by Hg‐porosimetry measuring pore size distribution, porosity, tortuosity and mean pore size. Permeability measurements were also performed. The higher the carbon content was the lower both porosity and permeability were. Afterwards, electrodes were prepared with these GDLs and were electrochemically characterised. Electrochemical surface area (ESA) was determined and fuel cell performance was evaluated under different fuel and comburent stoichiometries, supporting these results with impedance spectra. This made it possible to see the benefits of the MPL inclusion in the electrode structure, with a significant increase in the fuel cell performance and ESA. Once the goodness of the MPL was confirmed, result analysis led to an optimum MPL composition of 2 mg cm–2 of carbon for both electrodes, anode and cathode.

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Fuel Cells

Tập 10 Số 5

770-777

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