Electroreduction of Fe3+, O2 and Fe(CN)63- at the n-pyrite (FeS2) Surface

K. K. Mishra; K. Osseo-Asare

doi:10.1149/1.2069042

Electroreduction of Fe³⁺, O₂ and Fe(CN)₆^3- at the n-pyrite (FeS₂) Surface

K. K. Mishra, K. Osseo-Asare

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

14 Scopus citations

Abstract

The electroreduction of Fe(CN)₆^3-, Fe³⁺, and O₂, on the pyrite (FeS₂) surface in the dark has been studied with the rotating disk electrode technique. Saturation of the cathodic current density with the concentrations of Fe(CN)₆^3- and Fe^3- and with rotation speed was observed. The potential drop within the solid and the Helmholtz layer varied with the applied potential. The results are interpreted in terms of a charge-transfer model involving mediation by bandgap surface states. Fermi level pinning is ascribed to the presence of surface states and the possible origins of these surface states are discussed.

Original language	English (US)
Pages (from-to)	3116-3120
Number of pages	5
Journal	Journal of the Electrochemical Society
Volume	139
Issue number	11
DOIs	https://doi.org/10.1149/1.2069042
State	Published - 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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1.2069042

Cite this

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abstract = "The electroreduction of Fe(CN)63-, Fe3+, and O2, on the pyrite (FeS2) surface in the dark has been studied with the rotating disk electrode technique. Saturation of the cathodic current density with the concentrations of Fe(CN)63- and Fe3- and with rotation speed was observed. The potential drop within the solid and the Helmholtz layer varied with the applied potential. The results are interpreted in terms of a charge-transfer model involving mediation by bandgap surface states. Fermi level pinning is ascribed to the presence of surface states and the possible origins of these surface states are discussed.",

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AU - Osseo-Asare, K.

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N2 - The electroreduction of Fe(CN)63-, Fe3+, and O2, on the pyrite (FeS2) surface in the dark has been studied with the rotating disk electrode technique. Saturation of the cathodic current density with the concentrations of Fe(CN)63- and Fe3- and with rotation speed was observed. The potential drop within the solid and the Helmholtz layer varied with the applied potential. The results are interpreted in terms of a charge-transfer model involving mediation by bandgap surface states. Fermi level pinning is ascribed to the presence of surface states and the possible origins of these surface states are discussed.

AB - The electroreduction of Fe(CN)63-, Fe3+, and O2, on the pyrite (FeS2) surface in the dark has been studied with the rotating disk electrode technique. Saturation of the cathodic current density with the concentrations of Fe(CN)63- and Fe3- and with rotation speed was observed. The potential drop within the solid and the Helmholtz layer varied with the applied potential. The results are interpreted in terms of a charge-transfer model involving mediation by bandgap surface states. Fermi level pinning is ascribed to the presence of surface states and the possible origins of these surface states are discussed.

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