Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 153, Issue 8, Pages A1599-A1603Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.2210590
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The nature of platinum dissolution and precipitation in a polymer electrolyte membrane of a membrane electrode assembly (MEA) for a proton-exchange membrane fuel cell (PEMFC) was studied using a potential holding experiment at 1.0 V vs a reversible hydrogen electrode and high-resolution transmission electron microscopy. The electrochemically active surface area decreased depending on the holding time, and platinum deposition was observed in the polymer electrolyte membrane near a cathode catalyst layer. However, platinum dissolution and deposition out of the catalyst layer were greatly reduced when a platinum black electrode was used. In the experiment using a double-layered catalyst layer, platinum redeposited not on the carbon black surface but rather on the platinum black surface. (c) 2006 The Electrochemical Society.
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