Electrodeposition of zinc on glassy carbon from ZnCl/sub 2/ and ZnBr/sub 2/ electrolytes

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2120059· OSTI ID:5473936

McBreen, J; Gannon, E

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.

• Research Organization: Brookhaven National Laboratory, Department of Energy and Environment, Upton, New York
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5473936
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 130:8; ISSN JESOA
• Country of Publication: United States
• Language: English

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400400* -- Electrochemistry
BROMIDES
BROMINE COMPOUNDS
CARBON
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
COATINGS
CRYSTALLIZATION
DATA COVARIANCES
DEPOSITION
DIFFUSION
ELECTRICAL TRANSIENTS
ELECTROCHEMISTRY
ELECTRODEPOSITED COATINGS
ELECTRODEPOSITION
ELECTROLYSIS
ELECTROLYTES
ELECTRON MICROSCOPY
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
IMPURITIES
KINETICS
LYSIS
METALS
MICROSCOPY
NONMETALS
NUCLEATION
OVERVOLTAGE
PHASE TRANSFORMATIONS
SCANNING ELECTRON MICROSCOPY
STABILITY
SURFACE COATING
THREE-DIMENSIONAL CALCULATIONS
TRANSIENTS
VOLTAGE DROP
VOLTAMETRY
ZINC
ZINC BROMIDES
ZINC CHLORIDES
ZINC COMPOUNDS
ZINC HALIDES