2006 Fiscal Year Final Research Report Summary
Reaction mechanism of methanol and carbon monoxide electrooxidation by using gold nanoparticles based electrocatalysts
| Project/Area Number |
17350099
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Kyoto University |
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Principal Investigator |
OGUMI Zempachi Kyoto University, Graduate School of Engineering, Professor, 工学研究科, 教授 (60110764)
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| Co-Investigator(Kenkyū-buntansha) |
IRIYAMA Yasutoshi Kyoto University, Graduate School of Engineering, Assistant Professor, 工学研究科, 助手 (30335195)
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| Project Period (FY) |
2005 – 2006
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| Keywords | fuel cells / electrocatalyst / anode / gold nanoparticles / methanol oxidation / CO oxidation |
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| Research Abstract |
In this work, we aimed the fabrication of gold nanoparticles based electrocatalysts for methanol and carbon monoxide electrooxidation and then the oxidation mechanism was also discussed. Gold nanoparticles of ca. 4 nm in diameter were deposited on a Pt-Ru/C catalyst by the gas-phase grafting method, and the electrocatalytic activities of Pt-Ru/C and gold nanoparticles deposited on a Pt-Ru/C catalyst in the electrooxidation of methanol and CO were studied. The deposition of gold nanoparticles on Pt-Ru/C enhanced its electrocatalytic activity for methanol oxidation at a lower potential region (<450 mV). In addition, the promotion of CO oxidation by gold nanoparticles on Pt-Ru/C was confirmed by CO stripping voltammetry. In addition, gold nanoparticles supported on Pt-Sn/C and Pt/C were also prepared by gas-phase grafting method and their catalytic activities for methanol oxidation were evaluated by a steady-state polarization measurement. Based on the result from X-ray photoelectron spectroscopy, gold nanoparticles deposited on Pt-Sn/C and Pt/C were in the zero-oxidation state. Electrochemical measurements performed in an aqueous solution of 1 mol dm^<-3> (M) HClO_4 and 1 M CH_3OH demonstrated that the addition of gold nanoparticles on Pt-Sn/C catalyst exhibited higher catalytic activities for methanol oxidation compared with Pt-Sn/C catalyst without gold nanoparticles. In contrast, nano-Au/Pt/C and Pt/C showed the almost identical catalytic activities. The results showed that the catalytic activities of gold nanoparticles were influenced by supporting materials. In addition, the supporting materials were found to give a supplemental influence on the ability of gold nanoparticles to oxidize CO.
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Research Products
(4 results)
