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Received June 4, 2007
Accepted November 21, 2007
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Methanol-tolerant PdPt/C alloy catalyst for oxygen electro-reduction reaction
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Gwanak-gu, Seoul 151-744, Korea 1School of Chemical Engineering & Specialized Graduate School of Hydrogen and Fuel Cell Engineering, Chonbuk National University, Deokjin dong, Deokjin-gu, Jeonju 561-756, Korea 2Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul 139-701, Korea
Korean Journal of Chemical Engineering, July 2008, 25(4), 770-774(5), 10.1007/s11814-008-0126-y
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Abstract
A carbon-supported Pd-based PdPt catalyst (PdPt/C) with a small amount of Pt was prepared by borohydride reduction method and its activity in the oxygen electro-reduction reaction (ORR) was investigated in acidic conditions both with and without methanol. For comparison, carbon-supported Pt (Pt/C) and Pd (Pd/C) catalysts were prepared and the ORR activities were compared. Results revealed that the PdPt/C catalyst showed slightly lower ORR activity in terms of onset potential of oxygen reduction than Pt/C catalyst in 0.1M HClO4. However, PdPt/C catalyst exhibited enhanced activity toward selective ORR with methanol-tolerant characteristics in 0.1M HClO4 in the presence of methanol. The PdPt/C catalyst prepared here is suitable for use as a cathodic electrocatalyst in direct alcohol fuel cells after addition of small amount of expensive Pt metal.
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