Ordered silicon nanocones as a highly efficient platinum catalyst support for direct methanol fuel cells |
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| Authors: | Jitendra N. Tiwari Te-Ming Chen Fu-Ming Pan Kun-Lin Lin |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan, ROC;2. Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 0660, Taiwan, ROC |
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| Abstract: | Platinum nanoparticles were electrodeposited on ordered silicon nanocones (SNCs) and used as the catalyst for methanol electro-oxidation in direct methanol fuel cells (DMFCs). Because of uniform dispersion of Pt nanoparticles and the high surface area, the Pt-SNC electrode exhibited superior electrocatalytic properties toward the methanol electro-oxidation, with the onset potential of 0.08 V (vs. SCE). According to chronoamperometric analysis and CO stripping cyclic voltammetric (CV) study, the Pt/SNC electrode had a stable electro-oxidation activity with a very good CO tolerance. The Si surface oxide surrounding the Pt nanoparticles on the SNCs was suggested to play a key role in improving the CO tolerance via the bifunctional mechanism. |
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| Keywords: | Silicon nanocone arrays Pt catalysts Mass activity Methanol oxidation |
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