1986 Fiscal Year Final Research Report Summary
Stability and the Lattice Defect of Metal Oxides in Molten Carbonate
| Project/Area Number |
60550569
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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
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| Research Institution | Yokohama National University |
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Principal Investigator |
OTA Ken-ichiro Assoc. Prof., Faculty of Engineering,Yokohama National Univ., 工学部, 助教授 (30011216)
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| Project Period (FY) |
1985 – 1986
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| Keywords | Molten carbonate / Fuel cell / Electrode / Ferrite / Nickel oxide / Stability / 溶解度 |
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| Research Abstract |
The solubility of NiO in molten carbonates is one of the key factors for the evaluation of stability of the cathode of the molten carbonate fuel cell. In this study, the solubilities of NiO in carbonate melts (62mol% <Li_2CO_3> -38mol% <K_2CO_3> ,43.5mol% <Li_2CO_3> -31.5mol% <Na_2CO_3> -25.0mol% <K_2CO_3> ) have been measured first as a function of partial pressures of carbon dioxide(0.1-latm) and oxygen (0.1-0.7atm) as well as temperature(823-1023K). The solubility of NiO was independent of the partial pressure of oxygen. The solubility of NiO in both melts increased with increasing <CO_2> pressure and decreased with temperature. The change of the solubility with <CO_2> pressure may be explained in terms of the acid fluxing mechanism. Next, the solubility of the nickel ferrite( <Ni_xFe_(3-x)O_4> ) which is one of the new candidates of the cathode material has been measured. The solubilities of Ni and Fe were found to be almost same. These values were 2 - 5 mol ppm at <CO_2> pressure 1 atm. These values are very small, compared to that of pure NiO(roughly one order of magnitude lower). The solubilities decreased at higher temperatures. The solubilities also increased as the <CO_2> pressure increased.
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Research Products
(4 results)
