International Journal of Hydrogen Energy, Vol.36, No.20, 13089-13095, 2011
A bi-functional cathode structure for alkaline-acid direct ethanol fuel cells
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 H(2)O(2) 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 H(2)O(2) 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.
Keywords:Fuel cell;Alkaline-acid direct ethanol fuel cell;Bi-functional structure;Impregnation-reduction method;Hydrogen peroxide decomposition;Nickel-chromium foam