| Project/Area Number |
08650781
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
SATO Kazunori Nagaoka University of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20143828)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | anode / solid electrolyte / fuel cell / layred oxides / proton-exchange / methane / transition metals / valence state |
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| Research Abstract |
New anode materials capable of the direct electrochemical oxidation of methane have been investigated. The LiMn_2O_4 spinel can be converted to HMn_2O_4, which shows a high catalytic activity for the gaseous oxidation of methane and butane. The high activity is caused by the specific valence state of teh surface Mnions due to the desorption of protons as hydrogen. The specific surface valence state of transition metal ions was found to be effective for the catalytic and electrocatalytic oxidation of fuels. Electrocatlytic reactions was investigated for the cells using a number of oxygen ion conductive electrolyte combined with the new anode materials. The proton desorption from the proton-exchanged transition metal oxideds and the combination 3d and 4d metals enhance the electrocatalytic activity for the anodic oxidation reaction of hydrogen by HCoO_2 and HCrO_2 and methane by PdCoO_2. The valence states of the transition metal ions allow hydrogen and methane to react efficiently with the oxygem ions transported through the electrolytes. This property of the layred transition metal oxides as the anode results in the genaration of high power density at alower temperatures below about 900ﾟC.
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