The electrodeposition of CdSe from alkaline electrolytes

St Kutzmutz, G. Láng, K. E. Heusler

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Polarization curves of CdSe electrodeposited from aqueous ammonia solutions containing selenosulfate and the EDTA complex of cadmium ions follow Tafel lines for current densities smaller than cathodic and anodic reaction limited current densities. Reaction orders for electrodeposition are one with respect to selenosulfate and zero with respect to cadmium ions. At high flow velocities of the electrolyte, only thin layers of CdSe are obtained. Very small effective diffusion coefficients determined from diffusion limited currents indicate diffusion into the electrolyte of a reaction product formed in an equilibrium reaction. Three-dimensional nucleation on the thin layer occurs at low flow velocities. A mechanism modeling the nucleation and growth kinetics is proposed. The Gibbs energy of formation of CdSe is calculated using measurements of the equilibrium potential of CdSe.

Original languageEnglish
Pages (from-to)955-965
Number of pages11
JournalElectrochimica Acta
Volume47
Issue number6
DOIs
Publication statusPublished - Dec 14 2001

Keywords

  • CdSe
  • Electrochemical kinetics
  • Electrocrystallization
  • Mechanism
  • Morphology

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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