Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 36, Issue 20, Pages 13089-13095Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2011.07.025
Keywords
Fuel cell; Alkaline-acid direct ethanol fuel cell; Bi-functional structure; Impregnation-reduction method; Hydrogen peroxide decomposition; Nickel-chromium foam
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Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [623010]
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An issue associated with the use of hydrogen peroxide as the oxidant in the so-called alkaline-acid direct ethanol fuel cell (AA-DEFC) is the problem of H2O2 decomposition, which causes a significant decrease in the cathode potential. The present work addresses this issue by developing a bi-functional cathode structure that is composed of the nickel-chromium (Ni-Cr) foam (functioning as the diffusion layer) with a highly dispersed gold particles (functioning as the catalyst layer) deposited onto the skeleton of the foam. This integrated cathode structure allows not only a reduction in H2O2 decomposition, but also an enhancement in the species transport in the cathode of the AA-DEFC. The fuel cell performance characterization shows that the use of the bi-functional cathode structure in the AA-DEFC enables the peak power density to be increased to 200 mW cm(-2) from 135 mW cm(-2) resulting from the use of the conventional cathode. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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