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Effect of carbon loading in microporous layer on PEM fuel cell performance

Authors
Journal
Journal of Power Sources
0378-7753
Publisher
Elsevier
Publication Date
Volume
163
Issue
1
Identifiers
DOI: 10.1016/j.jpowsour.2006.09.020
Keywords
  • Proton Exchange Membrane Fuel Cell
  • Gas Diffusion Layer
  • Microporous Layer
  • Carbon Loading
  • Water Management
Disciplines
  • Chemistry

Abstract

Abstract The effect of carbon loading in the microporous layer on the PEM fuel cell performance was investigated using mercury porosimetry, electrochemical polarization techniques and electrochemical impedance spectroscopy. When air was used as an oxidant, a maximum fuel cell performance was obtained for a carbon loading of 0.5 mg cm −2. The ac-impedance properties were analyzed based on the thin film/flooded-agglomerate dynamics in the catalyst layer and the oxygen diffusion kinetics in the gas diffusion layer. The ac-impedance study indicated that the optimized microporous layer results in an effective water management (i.e. a balancing of water saturations in the catalyst layer and the gas diffusion layer), thereby improving the oxygen diffusion kinetics.

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