Electrode arrays containing 91 combinations of Pt-Sn-M (M = Fe, Ni, Pd, and Ru) were prepared by borohydride reduction of aqueous metal salts on carbon paper, and screened by fluorescence assay for activity as ethanol eletrooxidation catalysts. Catalysts that showed high activity for this reaction were identified as being Pt( 80)Sn( 10)Fe(10), Pt( 80)Sn( 10)Ni(10), Pt( 70)Sn( 20)Pd( 10), and Pt( 70)Sn( 10)Ru(20) (numbers in parenthesis indicate atomic percent). These were significantly more active than Pt or PtSn catalysts, also present in the electrode arrays. These 4 compositions were synthesized as nanoparticles and characterized physically and electrochemically. X-ray diffraction showed a Pt face-centered cubic (fcc) structure with an average crystallite
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