Fermi Level Pinning at Pyrite (FeS2)/Electrolyte Junctions

K. K. Mishra; K. Osseo-Asare

doi:10.1149/1.2069296

Fermi Level Pinning at Pyrite (FeS₂)/Electrolyte Junctions

K. K. Mishra, K. Osseo-Asare

Research output: Contribution to journal › Article › peer-review

31 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)₆^4-/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 language	English (US)
Pages (from-to)	749-752
Number of pages	4
Journal	Journal of the Electrochemical Society
Volume	139
Issue number	3
DOIs	https://doi.org/10.1149/1.2069296
State	Published - 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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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1149/1.2069296

Cite this

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title = "Fermi Level Pinning at Pyrite (FeS2)/Electrolyte Junctions",

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.",

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T1 - Fermi Level Pinning at Pyrite (FeS2)/Electrolyte Junctions

AU - Mishra, K. K.

AU - Osseo-Asare, K.

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N2 - 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.

AB - 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.

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