Fermi Level Pinning at Pyrite (FeS2)/Electrolyte Junctions

K. K. Mishra, K. Osseo-Asare

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29 Scopus citations

Abstract

The photoelectrochemical behavior of n-FeS2 was investigated in aqueous and nonaqueous solvent systems. The value of the photopotential remains approximately constant [between 0.15 to 0.3 V (SCE)] over a redox potential range of 0.22 to 1.1 V (SCE) provided by the redox couples Cl-/Cl2, Br-/Br2, I-/I-3, and Fe(CN)64-/3-. Cyclic-voltammetry studies in acetonitrile electrolyte containing ferrocene and TMPD (N, N, N', N'-tetramethyl-p-phenylenediamine) revealed that pyrite can oxidize the reductants in the presence as well as in the absence of light. The quasi-metallic behavior of pyrite (FeS2) has been ascribed to the presence of surface states resulting in complete Fermi level pinning.

Original languageEnglish (US)
Pages (from-to)749-752
Number of pages4
JournalJournal of the Electrochemical Society
Volume139
Issue number3
DOIs
StatePublished - Mar 1992

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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