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Influence of morphology on the behaviour of electrodes in a proton-conducting Solid Oxide Fuel Cell

Lookup NU author(s): Professor Ian Metcalfe

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Abstract

SrCe0.95Yb0.05O3 (SCY) and related materials are under consideration as a proton conductors for Solid Oxide Fuel Cell (SOFC) electrolytes. Sintered pellets of SCY are used to perforin impedance spectroscopy (IS) Studies and fuel cell tests on cells with Pt electrodes of two different morphologies. Electrodes are applied to the SCY pellets by two routes: either by firing on a layer of Pt paint (denoted electrode P) or by magnetron Sputtering (electrode S). In impedance spectra recorded over a wide temperature range under humidified hydrogen, in symmetrical cell conditions, cells with S electrodes give rise to a Much smaller low frequency impedance feature than the cells with P electrodes. This is tentatively attributed to faster diffusion-related processes taking place at the S electrodes. The behaviour of working fuel cells with S and P electrode morphologies is evaluated in terms of maximum power output and Area Specific Resistance in two-atmosphere tests. The fuel cell anode with the S morphology results in superior fuel cell performance, in agreement with the impedance study. The influence of the two different electrode morphologies oil the behaviour of the cells is discussed with reference to their morphology, as determined by SEM and AFM. (C) 2009 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Baker RT, Salar R, Potter AR, Metcalfe IS, Sahibzada M

Publication type: Article

Publication status: Published

Journal: Journal of Power Sources

Year: 2009

Volume: 191

Issue: 2

Pages: 448-455

ISSN (print): 0378-7753

ISSN (electronic): 1873-2755

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.jpowsour.2009.02.039

DOI: 10.1016/j.jpowsour.2009.02.039

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