Sputter Deposition of Multi-Element Nanoparticles as Electrocatalysts for Methanol Oxidation
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概要
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Fabrication of multi-element nanoparticles on noncatalyzed gas diffusion electrodes (GDEs) by radio frequency sputter deposition was reported. X-ray diffraction analysis of the as-deposited films indicated crystalline fcc phases while energy dispersive X-ray spectroscope confirmed their composition as Pt50Fe11Co10Ni11Cu10Ag8. Scanning electron microscopy images revealed nanoparticulate nodules growing on the carbon particles. Cyclic voltammetry (CV) was employed to analyze their methanol oxidation abilities for direct methanol fuel cells. The CV responses improved upon cycling and became stabilized after 70 cycles. The areas under the CV curves were proportional to the amount of nanoparticles deposited. In mass activities the GDE with 5 nm nanoparticles demonstrated the highest values of 400–600 mA/mg. In comparing with Pt and Pt43Ru57, the Pt43Ru57 exhibited the lowest onset potential with the highest mass activities. Our work presents preliminary information on the catalytic behaviors of multi-element nanoparticles which is likely to bring new directions in catalyst design.
- 2008-07-25
著者
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Wu Pu-wei
Department Of Materials Science And Engineering National Tsing Hua University
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Lin Pang
Department Of Materials Science And Engineering National Chiao Tung University
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Yeh Kung-Yu
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.
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Tsai Chih-Fang
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.
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Chao Cheun-Guang
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.
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Wu Pu-Wei
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.
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Chao Cheun-Guang
Department of Management Information System, Chin Min Institute of Technology, Miaoli County 351 Taiwan, R.O.C.
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