Solubilities of nickel oxide in molten carbonate

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2069282· OSTI ID:7041279

Ota, K; Mitsushima, S; Kato, S; Asano, S; Yoshitake, H; Kamiya, N ^[1]

---

1. Dept. of Energy Engineering, Yokohama National Univ., 156 Tokiwadai, Hodogaya-ku, Yokohama 240 (JP)

Cathode dissolution is a major problem for the development of the molten carbonate fuel cell. This paper reports that in order to evaluate the stability of the cathode, the solubility of NiO has been measured for several compositions of molten alkaline carbonates in the CO{sub 2} pressure range from 10{sup {minus} 5} to 1 atm and the temperature range from 873 to 1023 K. The solubility depended on the CO{sub 2} pressure, although the solubility of NiO was independent of either O{sub 2} or H{sub 2}O pressure. In any composition of the Li/K and Li/Na carbonate melts, the acid dissolution has been observed at higher CO{sub 2} pressure and the basic dissolution has been observed at low CO{sub 2} pressure. NiO was found to be more stable in Li rich or Li/Na melts than in the Li/K eutectic melt.

• OSTI ID: 7041279
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 139:3; ISSN JESOA; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300501* -- Fuel Cells-- Design & Development
300503 -- Fuel Cells-- Materials
Components
& Auxiliaries
300505 -- Fuel Cells-- Electrochemistry
Mass Transfer & Thermodynamics
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATHODES
CHALCOGENIDES
CHEMICAL COMPOSITION
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELECTRODES
FABRICATION
FUEL CELLS
HIGH-TEMPERATURE FUEL CELLS
MATERIALS TESTING
MOLTEN CARBONATE FUEL CELLS
NICKEL COMPOUNDS
NICKEL OXIDES
OXIDES
OXYGEN COMPOUNDS
PRESSURE GRADIENTS
SOLUBILITY
STABILITY
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TESTING
TRANSITION ELEMENT COMPOUNDS