Electrochemical Properties of Nanocrystalline Cadmium Stannate Films
Open Access
- 1 January 2001
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 148 (8), E341-E347
- https://doi.org/10.1149/1.1379742
Abstract
Electrochemical properties of sol-gel nanocrystalline cadmium tin oxide electrodes (CTO) were investigated in 0.2 M potassium chloride buffered at pH 7.4 with phosphate. Films were found to be n-type degenerate semiconductors with charge carrier levels from 10191019 to 10221022 cm−3cm−3 depending on the thermal aftertreatment. X-ray diffraction analysis was used to reveal the appearance of the cubic cadmium stannate (Cd2SnO4)(Cd2SnO4) phase at annealing temperatures above 600°C, and to indicate the extent of this dominant phase above 750°C. The flatband potential (EFB,)(EFB,) of the film electrodes, as determined from capacitance measurements, was found to be around +0.25 V at pH 7.4. Electrochemical activity toward ten redox processes in the range −0.45V<E<0.45−0.45V(Eo′)(Eo′) from the CTO flatband potential. The slowest rates (≈10−5(≈10−5 cm s−1)s−1) were found for redox couples where Eo′≈EFB.Eo′≈EFB. For charge transfer from redox couples where Eo′Eo′ is away from EFB,EFB, the rates can be several orders of magnitude greater and it is thought that the density of states in the conduction band is rate limiting. © 2001 The Electrochemical Society. All rights reserved.Keywords
This publication has 34 references indexed in Scilit:
- Ferredoxin-Mediated Electrocatalytic Dehalogenation of Haloalkanes by Cytochrome P450camJournal of the American Chemical Society, 2000
- Synthesis and spectroscopic characterisation of Ydoped Cd2SnO4Journal of Materials Chemistry, 1999
- X‐ray Photoelectron Spectroscopy of Cadmium Tin Oxide Ceramics in As‐Fired and Electrochemically Reduced FormsJournal of the American Ceramic Society, 1991
- A novel method of producing dicadmium stannate in thin film formJournal of Materials Science, 1989
- Characterization of electrochemically reduced dicadmium stannateJournal of Materials Science, 1988
- Dicadmium Stannate as a Novel Electrode Material for Battery ApplicationsJournal of the Electrochemical Society, 1987
- Reduction of Cd2SnO4 and Cd2SnO4 / CdO Thin Film Electrodes in Sulfuric Acid ElectrolytesJournal of the Electrochemical Society, 1980
- Properties of Cadmium Stannate Thin Film Electrodes and Their Use in Photogalvanic CellsJournal of the Electrochemical Society, 1977
- Optical and Electrical Properties ofSn: A Defect SemiconductorPhysical Review B, 1972
- Electrochemical Properties of Polycrystalline Tin OxideJournal of the Electrochemical Society, 1970