Abstract
Cathodic electrodes based on electrodeposited Pt–WO 3 material for proton exchange membrane fuel cells (PEMFC) were studied in single cell configuration. Preparation of the electrodes was carried out by electrodeposition of Pt and WO 3 on commercial gas diffusion layer substrates (microporous carbon black layer on carbon cloth, ELAT E-TEK). The process of simultaneous electrodeposition of Pt and WO 3 is first analyzed from voltammetric curves. It is observed that the deposition of Pt is enhanced when WO 3 is present. Compositional analysis of the electrodes shows metallic platinum and WO 3 in variable proportions. The electrodeposited electrodes were characterized in single PEMFC. Membrane–electrode assemblies were prepared with Nafion ® 117 electrolyte membrane and a standard Pt/C anode. Pt–WO 3 electrodes showed enhanced stability and good response in single cell up to 1500 h. Performance degradation is attributed to a decrease in Pt electroactive area and increase of the internal resistance of the cell. These effects are possibly a consequence of the production of mobile tungsten species, like soluble WO 2 at high current demands and low cathode potentials.
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