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Metal oxide coated electrodes for oxygen reduction

Metal oxide coated electrodes for oxygen reduction
Metal oxide coated electrodes for oxygen reduction

The reduction of oxygen in aqueous NaOH has been studied at several cathodes includng carbon, gold, titanium dioxide (TiO2-x) and mixtures of TiO2-x with C or Au; the overall objective was to find improved materials for the preparation of hydrogen peroxide.

TiO2-x coatings on titanium were fabricated by the spraying and thermal decomposition of solutions of titanium n-butoxide in 2-propanol and titanium tetrachloride in methanol/water and the coatings were compared with the oxide layers produced by anodization of titanium. The TiO2-x coatings on titanium show very good chemical and physical stability during electrochemical experiments in several media. Voltammetric experiments show that at negative potentials the surface of TiO2-x undergoes reversible reduction and the potentials for the reduction of ions, oxygen and hydrogen peroxide all appear to be determined by the potential for this surface reduction.

Several procedures for the preparation of gold coatings have been studied (i) spraying solutions of Ti(IV) and Au(III) followed by thermal decomposition (ii) the electrodeposition or vacuum deposition of gold onto TiO2-x layers prepared in various ways. Mixed TiO2-x-C coatings have also been prepared by the spraying and thermal decomposition procedure in which the solution also contains a carbon powder. In all cases, stable coatings can be formed.

All coatings have been characterized using SEM, EDAX, voltammetry of the surface in 1 M NaOH and the kinetics of the Fe(CN)63-/Fe(CN)64- redox couple. It is clear that the morphology and properties reflect strongly the method of preparation.

The rotating ring-disc technique has been used to study the mechanism of oxygen reduction on these electrodes.

University of Southampton
Báez Báez, Victor Antonio
Báez Báez, Victor Antonio

Báez Báez, Victor Antonio (1994) Metal oxide coated electrodes for oxygen reduction. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

The reduction of oxygen in aqueous NaOH has been studied at several cathodes includng carbon, gold, titanium dioxide (TiO2-x) and mixtures of TiO2-x with C or Au; the overall objective was to find improved materials for the preparation of hydrogen peroxide.

TiO2-x coatings on titanium were fabricated by the spraying and thermal decomposition of solutions of titanium n-butoxide in 2-propanol and titanium tetrachloride in methanol/water and the coatings were compared with the oxide layers produced by anodization of titanium. The TiO2-x coatings on titanium show very good chemical and physical stability during electrochemical experiments in several media. Voltammetric experiments show that at negative potentials the surface of TiO2-x undergoes reversible reduction and the potentials for the reduction of ions, oxygen and hydrogen peroxide all appear to be determined by the potential for this surface reduction.

Several procedures for the preparation of gold coatings have been studied (i) spraying solutions of Ti(IV) and Au(III) followed by thermal decomposition (ii) the electrodeposition or vacuum deposition of gold onto TiO2-x layers prepared in various ways. Mixed TiO2-x-C coatings have also been prepared by the spraying and thermal decomposition procedure in which the solution also contains a carbon powder. In all cases, stable coatings can be formed.

All coatings have been characterized using SEM, EDAX, voltammetry of the surface in 1 M NaOH and the kinetics of the Fe(CN)63-/Fe(CN)64- redox couple. It is clear that the morphology and properties reflect strongly the method of preparation.

The rotating ring-disc technique has been used to study the mechanism of oxygen reduction on these electrodes.

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More information

Published date: 1994

Identifiers

Local EPrints ID: 462807
URI: http://eprints.soton.ac.uk/id/eprint/462807
PURE UUID: 1945661b-52b1-4674-9e7c-3567767abbc8

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Date deposited: 04 Jul 2022 20:05
Last modified: 04 Jul 2022 20:05

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Contributors

Author: Victor Antonio Báez Báez

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