Title

Decreasing Membrane Degradation through Heteropolyacid Sub-layers

Authors

Authors

R. P. Brooker; L. J. Bonville;D. K. Slattery

Comments

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Abbreviated Journal Title

J. Electrochem. Soc.

Keywords

POLYMER-ELECTROLYTE MEMBRANES; PEM FUEL-CELLS; DODECATUNGSTOPHOSPHORIC; ACID CRYSTALS; ION-EXCHANGE MEMBRANE; DODECAMOLYBDOPHOSPHORIC ACID; ELECTROCHEMICAL-BEHAVIOR; HUMIDITY RANGES; DURABILITY; PLATINUM; CARBON; Electrochemistry; Materials Science, Coatings & Films

Abstract

Heteropolyacids (HPAs) were adsorbed onto high surface area carbon, and incorporated in polymer electrolyte membrane fuel cells (PEMFCs) between the electrodes and membrane, forming "sub-layers." The addition of HPAs to these sub-layers significantly decreased membrane degradation in cells subjected to accelerated stress tests, as evidenced by a 50% reduction in fluoride emission rate (FER) and open circuit voltage (OCV) decay. Evidence of increased HPA and platinum concentration within the sub-layer indicates substantial HPA mobility. Modeling of the voltage profile through the sub-layer and membrane indicated that platinum precipitation was possible within the sub-layer, and that this is dependent on both the reduction potential and concentration of the HPA. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.017302jes] All rights reserved.

Journal Title

Journal of the Electrochemical Society

Volume

160

Issue/Number

1

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

F75

Last Page

F80

WOS Identifier

WOS:000313578400053

ISSN

0013-4651

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