| Project/Area Number |
63550693
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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 |
化学工学
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| Research Institution | MURORAN INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
KENJO Tadao INSTITUTION : MURORAN INSTITUTE OF TECHNOLOGY, DEPARTMENT : FACULTY OF ENGINEERING, TITLE OF POSITION : PROFESSOR, 工学部, 教授 (00005977)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | proton conductor / solid electrolyte / fuel cell / ポリリン酸 |
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| Research Abstract |
Metaphosphoric acid glasses containing phosphoric acid have been prepared and used as solid electrolytes for fuel cells. After metaphosphoric acid and SiO_2 or V_2O_5 were mixed in a mole ratio of 3 : 1 and melted in the electric furnace at 1000ﾟC, the fused glass was quenched by pouring onto the cold steel plate. The glasses obtained were ground into powder, which was then impregnated with 25-36wt% of phosphoric acid. The proton conductive solid electrolyte thus obtained was pressed into disks and used for the resistivity measurements and cell operations. The resistivity of the electrolytes was found to be the order of 10^2 OMEGAcm at 200ﾟC. This value is low enough for the fuel cell application. The solid electrolytes were set into the hydrogen-oxygen fuel cells and their polarization curves were measured at 200ﾟC. The maximum current density sustained by the solid electrolyte fuel cells was 20 mA/cm^2, which is still lower than that of the phosphoric acid cells. The relatively low performance of the cell was attributed to a poor electrode-electrolyte contact, particularly in the oxygen electrode. To improve the contact, the fuel cell was prepared by pressing the powder materials of the electrode and electrolyte. This preparative method led to a significant improvement in the cell performance. It was found that the electrode-electrolyte contact is an essential factor for the performance of solid electrolyte fuel cells.
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