1993 Fiscal Year Final Research Report Summary
Proton-Conductive Polyphosphate Electrolytes and their Application to Solid Electrolyte Fuel Cells
| Project/Area Number |
04650718
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業物理化学・複合材料
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| Research Institution | Muroran Institute of Technlogy |
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Principal Investigator |
TADAO Kenji Muroran Institute of Technlogy, Professor, 工学部, 教授 (00005977)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Fuel cell / Solid electrolyte / Proton conductor / Polyphoshate |
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| Research Abstract |
Solid electrolytes are required to solve the life problem of phosphoric acid fuel cells. This study is an attempt to prepare solid proton conductors by a minor modification of polyphosphate. NH_4PO_3 was able to be made proton-conductive by thermal decomposition of NH_4^+ to H^+ + NH_3. The partially decomposed NH_4PO_3, however, melted below 300'C.To increase the melting temperature, (NH_4)_2SiP_4O_<13> was attempted as a starting materials. The heat-treated (NH_4)_2SiP_4O_<13> was thermally more resistive, but its conductivity was lower. To attain a high conductivity and a high melting temperature simultaneously, a composite electrolyte consisting of (NH_4)_2SiP_4O_<13> bound together by NH_4PO_3 was prepared. This material obtained has the maximum conductivity of 0.1S/cm at 400'c, but above this temperature, the conductivity decreases with increasing temperature, probably due to dehydration. The proton conductivity was confirmed by the potential measurement of an H_2 concentration cell installed with this electrolyte.
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