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Electron Transport in Electrodes Modified With Synthetic Clays Containing Electrochemically Active Transition Metal Sites

Gilles Villemure
Gilles Villemure
Department of Chemistry, University of New Brunswick, P.O. Box 45222, Fredericton, New Brunswick E3B 6E2, Canada
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January 01, 2002


Clay-modified electrodes (CMEs) are one type of chemically modified electrode. They are prepared by depositing thin films of clays on conductive substrates (Macha and Fitch 1998; Baker and Senaratne 1993; Bard and Mallouk 1992; Fitch 1990). The aim is to make use of the physical and chemical properties of the clay coatings to control the electron transfer processes occurring at the electrode solution interface.

Clay minerals have many desirable properties as electrode surface modifiers: high thermal and chemical stabilities, well defined layered structures with large surface area, wide adsorption capabilities and potential as catalysts and/or catalyst supports (Newman and Brown 1987). CMEs have been used in selective analysis (Zen et al. 1996a; Zen and Chen 1997), in catalysis (Oyama and Anson 1986; Ouyang and Wang 1998) or as support matrices for catalysts (Ghosh et al. 1984; Gobi and Ramaraj 1998), in the fabrication of electrochemical (Rong and Mallouk 1993) and photoelectrochemical devices (Gobi and Ramaraj 1994; Shyu and Wang 1997) etc. CMEs are also useful devices for the study of mass transport in clay films. For example, Fitch and coworkers (Stein and Fitch 1996) have discussed the use of CMEs for the study of the diffusion of pollutants through clay beds. Since the clay films used in CMEs are very thin, transport of probe species through the films occurs on a

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Clay Minerals Society Workshop Lectures

Electrochemical Properties of Clays

Alanah Fitch
Alanah Fitch
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Clay Minerals Society
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Publication date:
January 01, 2002




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