Electrodeposition of zinc on glassy carbon from ZnCl/sub 2/ and ZnBr/sub 2/ electrolytes
Abstract
The initial stages of the electrocrystallization of zinc from 3M ZnCl/sub 2/ and 3M ZnBr/sub 2/ on glassy carbon has been investigated using cyclic voltametry, the potential step method, and scanning electron microscopy. Particular care was taken to ensure electrolyte purity and to eliminate resistance effects in the measurements. The nucleation overvoltage in 3M ZnCl/sub 2/ was about 17 and about 12 mV in 3M ZnBr/sub 2/. In 3M ZnCl/sub 2/, the current transients from the potential step measurements could be fitted to a simple model that assumes instantaneous nucleation followed by growth of three dimensional centers under kinetic control. A similar mechanism is operative for 3M ZnBr/sub 2/ at low overvoltages. At higher overvoltages, the current transient is governed by mixed kinetic and diffusion control and cannot be fitted to a simple model. The lower nucleation overvoltage and the faster kinetics in 3M ZnBr/sub 2/ is correlated with the lower stability constants for the zinc bromide complexes. Erroneous results are obtained when resistance effects are not accounted for.
- Authors:
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory, Department of Energy and Environment, Upton, New York
- OSTI Identifier:
- 5473936
- DOE Contract Number:
- AC02-76CH00016
- Resource Type:
- Journal Article
- Journal Name:
- J. Electrochem. Soc.; (United States)
- Additional Journal Information:
- Journal Volume: 130:8
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 25 ENERGY STORAGE; 36 MATERIALS SCIENCE; CARBON; ELECTRODEPOSITED COATINGS; ZINC; CRYSTALLIZATION; ELECTRODEPOSITION; ZINC BROMIDES; ELECTROCHEMISTRY; ZINC CHLORIDES; DATA COVARIANCES; DIFFUSION; ELECTRICAL TRANSIENTS; ELECTROLYTES; IMPURITIES; KINETICS; NUCLEATION; OVERVOLTAGE; SCANNING ELECTRON MICROSCOPY; STABILITY; THREE-DIMENSIONAL CALCULATIONS; VOLTAMETRY; BROMIDES; BROMINE COMPOUNDS; CHEMISTRY; CHLORIDES; CHLORINE COMPOUNDS; COATINGS; DEPOSITION; ELECTROLYSIS; ELECTRON MICROSCOPY; ELEMENTS; HALIDES; HALOGEN COMPOUNDS; LYSIS; METALS; MICROSCOPY; NONMETALS; PHASE TRANSFORMATIONS; SURFACE COATING; TRANSIENTS; VOLTAGE DROP; ZINC COMPOUNDS; ZINC HALIDES; 400400* - Electrochemistry; 250903 - Energy Storage- Batteries- Materials, Components, & Auxiliaries; 360104 - Metals & Alloys- Physical Properties
Citation Formats
McBreen, J, and Gannon, E. Electrodeposition of zinc on glassy carbon from ZnCl/sub 2/ and ZnBr/sub 2/ electrolytes. United States: N. p., 1983.
Web. doi:10.1149/1.2120059.
McBreen, J, & Gannon, E. Electrodeposition of zinc on glassy carbon from ZnCl/sub 2/ and ZnBr/sub 2/ electrolytes. United States. https://doi.org/10.1149/1.2120059
McBreen, J, and Gannon, E. 1983.
"Electrodeposition of zinc on glassy carbon from ZnCl/sub 2/ and ZnBr/sub 2/ electrolytes". United States. https://doi.org/10.1149/1.2120059.
@article{osti_5473936,
title = {Electrodeposition of zinc on glassy carbon from ZnCl/sub 2/ and ZnBr/sub 2/ electrolytes},
author = {McBreen, J and Gannon, E},
abstractNote = {The initial stages of the electrocrystallization of zinc from 3M ZnCl/sub 2/ and 3M ZnBr/sub 2/ on glassy carbon has been investigated using cyclic voltametry, the potential step method, and scanning electron microscopy. Particular care was taken to ensure electrolyte purity and to eliminate resistance effects in the measurements. The nucleation overvoltage in 3M ZnCl/sub 2/ was about 17 and about 12 mV in 3M ZnBr/sub 2/. In 3M ZnCl/sub 2/, the current transients from the potential step measurements could be fitted to a simple model that assumes instantaneous nucleation followed by growth of three dimensional centers under kinetic control. A similar mechanism is operative for 3M ZnBr/sub 2/ at low overvoltages. At higher overvoltages, the current transient is governed by mixed kinetic and diffusion control and cannot be fitted to a simple model. The lower nucleation overvoltage and the faster kinetics in 3M ZnBr/sub 2/ is correlated with the lower stability constants for the zinc bromide complexes. Erroneous results are obtained when resistance effects are not accounted for.},
doi = {10.1149/1.2120059},
url = {https://www.osti.gov/biblio/5473936},
journal = {J. Electrochem. Soc.; (United States)},
number = ,
volume = 130:8,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 1983},
month = {Mon Aug 01 00:00:00 EDT 1983}
}