The periodic, electrochemical codeposition of cadmium and tellurium

Journal Article · Wed Apr 01 04:00:00 EST 1987 · A.I.Ch.E. J.; (United States)

DOI:https://doi.org/10.1002/aic.690330411· OSTI ID:5522157

Verbrugge, M W; Tobias, C W

A mathematical model is presented for the codeposition of cadmium and tellurium onto a rotating-disk electrode. The treatment incorporates the equation of convective diffusion for liquid phase mass transport, Butler-Volmer expressions for charge-transfer reactions, and a thermodynamic model for individual component activities in the solid state. Because of the formation of CdTe, a compound that has a large negative free energy of formation, the cadmium deposition reaction occurs at potentials substantially positive to its standard electrode potential (U/sup THETA/ = -0.40V). This reaction, along with the deposition of tellurium (U/sup THETA/ = +0.55V), produces an electrodeposit that contains cadmium, tellurium, and cadmium telluride. The model can be used to calculate transient current-potential relationships, ionic concentration profiles, and deposit compositions. Transport and kinetic parameters for cadmium and tellurium deposition are reported; a multidimensional optimization routine is used to evaluate physiochemical parameters from experimental data for the codeposition process.

• Research Organization: Dept. of Chemical Engineering, Univ. of California at Berkeley, and Materials and Molecular Research Div., Lawrence Berkeley Lab., Berkeley, CA 94720
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5522157
• Journal Information: A.I.Ch.E. J.; (United States), Journal Name: A.I.Ch.E. J.; (United States) Vol. 33:4; ISSN AICEA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400400* -- Electrochemistry
CADMIUM
CADMIUM COMPOUNDS
CADMIUM TELLURIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMISTRY
DEPOSITION
DEPOSITS
DIFFUSION
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
KINETICS
MASS TRANSFER
MATHEMATICAL MODELS
METALS
REACTION KINETICS
SEMIMETALS
TELLURIDES
TELLURIUM
TELLURIUM COMPOUNDS
THERMODYNAMICS