Transference numbers of zinc in zinc-chloride battery electrolytes. [The Hittorf method]
Migration of zinc-ion species affects the local zinc chloride concentration and solution density in the electrolyte adjacent to the zinc electrode and thereby influences natural convection at this electrode during both charge and discharge. This work presents experimentally measured transference numbers for ionic-zinc species in aqueous solutions containing 1.5-3m ZnCl/sub 2/+0-4m KCl+0-3m NaCl+0-0.4m HCl at 30/degree/C using the Hittorf method. Negative transference numbers for zinc are obtained in most mixed-salt solutions with minima of -0.2 to -0.3 occurring in the chloride ion concentration range of 6-8m. The transference number of zinc depends generally on the total chloride content. The effect of the cations is small, noticeable only at higher concentration, and follows the order of their ionic mobilities. The data support the presence of anionic zinc complexes such as ZnCl/sub 3//sup -/ and ZnCl/sub 4//sup 2-/, which account for the negative transference numbers. 41 refs.
- Research Organization:
- Wayne State Univ, Detroit, MI, USA
- OSTI ID:
- 6660481
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 129:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ZINC-CHLORINE BATTERIES
ELECTROLYTES
MASS TRANSFER
ION MOBILITY
IONIC CONDUCTIVITY
NATURAL CONVECTION
ZINC
ZINC CHLORIDES
CHLORIDES
CHLORINE COMPOUNDS
CONVECTION
ELECTRIC BATTERIES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
METAL-GAS BATTERIES
METALS
MOBILITY
PARTICLE MOBILITY
PHYSICAL PROPERTIES
ZINC COMPOUNDS
ZINC HALIDES
250903* - Energy Storage- Batteries- Materials
Components
& Auxiliaries