Molten carbonate fuel cell program. Composition gradients induced by current flow in Li/sub 2/CO/sub 3/-K/sub 2/CO/sub 3/ mixtures. Progress report, July 1-December 31, 1978
In a molten carbonate fuel cell current flow can cause gradients in the Li/K ratio of a LiKCO/sub 3/ electrolyte if the cation mobilities are, as in most binary molten salt mixtures, unequal. A one-dimensional model predicts 10 to 20 percent composition gradients from estimated values of mobility, activity and diffusivity, none of which is well known. Predictions from a similar model for a system of known properties have been confirmed experimentally by electrolysis-relaxation experiments. The model calculations for carbonates appear consistent with electrolysis-relaxation measurements on fuel cell tiles, but clearly indicate the need for additional specific physical property data, especially the transference number. This report is based on the material presented at the EPRI-DOE sponsored Molten Carbonate Fuel Cell Workshop, held at Oak Ridge National Lab., October 31-November 2, 1978.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5835352
- Report Number(s):
- ORNL/TM-7061
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HIGH-TEMPERATURE FUEL CELLS
MASS TRANSFER
CATIONS
DIFFUSION
ELECTRIC CURRENTS
ELECTROLYSIS
ELECTROLYTES
ELECTROMOTIVE FORCE
ION MOBILITY
LITHIUM CARBONATES
MATHEMATICAL MODELS
MIGRATION
MOLTEN SALTS
POLARIZATION
POTASSIUM CARBONATES
RELAXATION
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHARGED PARTICLES
CURRENTS
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
FUEL CELLS
IONS
LITHIUM COMPOUNDS
LYSIS
MOBILITY
OXYGEN COMPOUNDS
PARTICLE MOBILITY
POTASSIUM COMPOUNDS
SALTS
300505* - Fuel Cells- Electrochemistry
Mass Transfer & Thermodynamics