Electrode heat balances of electrochemical cells: Application to water electrolysis
Irreversible thermodynamics has been used to describe electrode heat balances of electrochemical cells. The specific example of electrolysis of water in molten sodium hydroxide is chosen for the purpose of illustration. Experimental data are presented for this system. The importance of a distinction between time and chargedependent changes in entropy is pointed out. Only changes of the last type contribute to cell EMF's. The relation between EMF of thermocells, the temperature coefficient of an isothermal cell, and the electrode heat balances are discussed particularly. Results show a reasonably good agreement between theoretical predictions and experimental observations. With partial pressures of hydrogen and water vapor in the cathodic compartment of 0.8 and 0.2 atm, respectively, 63 kJ is evolved, and with partial pressures of oxygen and water vapor in the anodic compartment of 0.8 and 0.2 atm, respectively, 72 kJ is absorbed during the passage of 1F of current at 623 K.
- Research Organization:
- Department of Nuclear Engineering, Faculty of Engineering, Kyoto University, Sakyo-ku, Kyoto
- OSTI ID:
- 6017536
- Journal Information:
- J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 131:11; ISSN JESOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
300505* -- Fuel Cells-- Electrochemistry
Mass Transfer & Thermodynamics
ALKALI METAL COMPOUNDS
CALCULATION METHODS
DATA
DIRECT ENERGY CONVERTERS
ELECTRIC CHARGES
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROLYSIS
ENTROPY
EXPERIMENTAL DATA
FLUIDS
FUEL CELLS
GASES
HIGH TEMPERATURE
HIGH-TEMPERATURE FUEL CELLS
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
LYSIS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
TEMPERATURE DISTRIBUTION
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
VAPORS
WATER
WATER VAPOR