Semiconductor electrochemistry of participate pyrite

Dissolution via hole and electron pathways

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Electrochemical and photoelectrochemical experiments were conducted to investigate the pyrite/aqueous interface reaction by using microparticles of synthetic pyrite as electrodes. The potential of the conduction bandedge of pyrite as a function of pH was estimated to be Ec = 0.34 - 0.059 pH in volts vs. saturated calomel electrode (SCE). The open-circuit potential of pyrite electrode in 1 M HNO3 solution was 0.38 VSCE. Illumination of pyrite microelectrodes increased both the anodic current and the dissolution rate dramatically but had little effect on the cathodic current and the cathodic dissolution. These results indicate that pyrite, as an n-type semiconductor, dissolves anodically through a hole transfer (valence band) pathway, while cathodic dissolution only involves electron reaction (conduction band).

Original languageEnglish (US)
Pages (from-to)3192-3198
Number of pages7
JournalJournal of the Electrochemical Society
Volume143
Issue number10
DOIs
StatePublished - Jan 1 1996

Fingerprint

Pyrites
Electrochemistry
pyrites
electrochemistry
dissolving
Dissolution
Semiconductor materials
Electrons
electrons
Electrodes
electrodes
n-type semiconductors
Microelectrodes
microparticles
Valence bands
Conduction bands
pyrite
conduction bands
Lighting
illumination

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Electrochemical and photoelectrochemical experiments were conducted to investigate the pyrite/aqueous interface reaction by using microparticles of synthetic pyrite as electrodes. The potential of the conduction bandedge of pyrite as a function of pH was estimated to be Ec = 0.34 - 0.059 pH in volts vs. saturated calomel electrode (SCE). The open-circuit potential of pyrite electrode in 1 M HNO3 solution was 0.38 VSCE. Illumination of pyrite microelectrodes increased both the anodic current and the dissolution rate dramatically but had little effect on the cathodic current and the cathodic dissolution. These results indicate that pyrite, as an n-type semiconductor, dissolves anodically through a hole transfer (valence band) pathway, while cathodic dissolution only involves electron reaction (conduction band).",
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Semiconductor electrochemistry of participate pyrite : Dissolution via hole and electron pathways. / Wei, D.; Osseo-Asare, Kwadwo Asare.

In: Journal of the Electrochemical Society, Vol. 143, No. 10, 01.01.1996, p. 3192-3198.

Research output: Contribution to journalArticle

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T2 - Dissolution via hole and electron pathways

AU - Wei, D.

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