Periodic electrodeposition of alloys
An experimental and theoretical investigation of periodic alloy electrodeposition is presented. A mathematical model is developed for the electrodeposition of alloys by an arbitrarily specified cell-current or electrode-potential waveform. Transient, convective mass transfer, Butler-Volmer electrode kinetics, and individual component activities in the electrodeposit are considered. Theoretical predictions are compared with experimental results for electrodeposition of cadmium telluride onto a rotating disk electrode. Analytical techniques clearly illustrated the efffect of the cell-current waveform on the electrodeposit morphology and physical properties. A series solution is presented for the ionic concentrations during triangular current-sweep chronopotentiometry at a rotating disk electrode, and at a stationary, planar electrode in the absence of free convection. The treatment is valid for electrode processes with one electrochemical reaction of uniform rate along the electrode surface. The advantages of controlled-current processes, relative to controlled-potential processes, for obtaining kinetic, thermodynamic, and transport information are elucidated. Theoretical predictions are compared with results obtained for the deposition of cadmium from a dilute, equeous, cadmium-sulfate/potassium-sulfate electrolyte. The cadmium telluride material electrodeposited in the alloy study is photovoltaic and semiconducting.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6197723
- Report Number(s):
- LBL-20500; ON: DE86006269
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CADMIUM
ELECTRODEPOSITION
CADMIUM TELLURIDES
MATHEMATICAL MODELS
ELECTROLYTES
VISIBLE RADIATION
CADMIUM COMPOUNDS
CHALCOGENIDES
DEPOSITION
ELECTROLYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
LYSIS
METALS
RADIATIONS
SURFACE COATING
TELLURIDES
TELLURIUM COMPOUNDS
360601* - Other Materials- Preparation & Manufacture
400400 - Electrochemistry