Stability and characterization of oxygen species in alkali molten carbonated: A thermodynamic and electrochemical approach
- Ecole Nationale Superieure de Chimie, Paris (France). Lab d'Electrochimie
The study of the chemical and electrochemical properties of molten carbonate has been widely discussed in the last 20 years because of the necessity for optimizing molten carbonate fuel cell (MCFC) performance. The stability and electrochemical behavior of reduced oxygen species were investigated in several alkali molten carbonates at different oxoacidity levels and temperatures. Theoretical predictions and experimental results were in good agreement and show that, in Na-K, Li-Na, Li-K, and Li-Na-K melts, peroxide species can only be stabilized in basic media. Superoxide species, unstable in lithium-containing carbonate, can be stabilized in Na-K under slightly basic conditions. Peroxide/oxide and superoxide/oxide redox systems were characterized by voltammetric and convolution potential sweep techniques. It was shown that CO[sub 2] does not participate in the rate-determining reduction mechanisms of both superoxide and peroxide species. Electrochemical parameters relative to the cited systems (D, [delta], E[sup 0], E[sub 1/2]), as well as the solubility of reduced oxygen species were determined.
- OSTI ID:
- 5693619
- Journal Information:
- Journal of the Electrochemical Society; (United States), Vol. 140:11; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTROLYTES
ELECTROCHEMISTRY
THERMODYNAMICS
MOLTEN CARBONATE FUEL CELLS
OXYGEN COMPOUNDS
LITHIUM CARBONATES
POTASSIUM CARBONATES
SODIUM CARBONATES
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHEMISTRY
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
FUEL CELLS
HIGH-TEMPERATURE FUEL CELLS
LITHIUM COMPOUNDS
POTASSIUM COMPOUNDS
SODIUM COMPOUNDS
300505* - Fuel Cells- Electrochemistry
Mass Transfer & Thermodynamics