Abstract
ABSTRACT: Controlled electrodeposition of dendritic nano-structured gold-platinum (AuPt) alloy onto an elec-trochemically pretreated carbon paper substrate was conducted in an attempt to improve catalystutilization and to secure an electronic percolation network toward formic acid (FA) fuel cell appli-cation. The AuPt catalysts were obtained by potentiostatic deposition. AuPt catalysts synthesizedas bimetallic alloys with 60% Au content exhibited the highest catalytic activity towards formicacid electro-oxidation. The origin of this high activity and the role of Au were evaluated, in par-ticular, by XPS analysis. Polarization and stability measurements with 1 mg cm −2 AuPt catalyst(only 0.4 mg cm −2 Pt) showed 52 mW cm −2 and sustainable performance using 3 M formic acid anddry air at 40 o C.Keywords : electrodeposition, AuPt alloy, dendritic nanostructure, formic acid fuel cells. Received August 23, 2010 : Accepted September 7, 2010 1. Introduction Small organic molecules (SOM) such as methanol,formic acid, formate, and ethanol have great potentialas possible fuels in direct small organic fuel cells.
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