Publication

Use of Ti/IrO2/SnO2-Sb2O5 electrodes for ozone production

Christos Comninellis, Paul Bowen
1998
Conference Papers

Abstract

Ozone prodn. in 5M H2SO4 with Ti/IrO2/SnO2 - Sb2O5 electrodes was studied. Electrodes were prepd. at 550 Deg by spray pyrolysis of a soln. of precursors contg. tin and antimony chlorides. The aim of this work was to elucidate the mechanism of activation and deactivation of Ti/IrO2/SnO2-Sb2O5 electrodes for ozone prodn. Under galvanostatic conditions the anodic potential and O3 prodn. increases firstly reaching a max. then suddenly decrease. The authors explain this observation by considering that the SnO2 layer prepd. by spray pyrolysis is under stoichiometric for oxygen. During the activation SnO2 becomes stoichiometric. This condition is necessary for ozone prodn. XRD anal. showed no modification of the structure of the bulk during ozone prodn. Nevertheless XRF anal. revealed an inhomogeneity of the at. Sb/Sn ratio on the surface of the electrode leading to pitting corrosion which is responsible of the deactivation of the electrode. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/a7314de6-3738-4b10-b48a-828260533172

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Christos Comninellis, Paul Bowen
1998
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a7314de6-3738-4b10-b48a-828260533172

About this result

Related concepts (32)

Electrode

An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte, a vacuum or air). Electrodes are essential parts of batteries that can consist of a variety of materials depending on the type of battery. The electrophore, invented by Johan Wilcke, was an early version of an electrode used to study static electricity. Electrodes are an essential part of any battery. The first electrochemical battery made was devised by Alessandro Volta and was aptly named the Voltaic cell.

Corrosion

Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual deterioration of materials (usually a metal) by chemical or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and preventing corrosion. In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen, hydrogen or hydroxide. Rusting, the formation of iron oxides, is a well-known example of electrochemical corrosion.

Standard electrode potential

In electrochemistry, standard electrode potential , or , is a measure of the reducing power of any element or compound. The IUPAC "Gold Book" defines it as: "the value of the standard emf (electromotive force) of a cell in which molecular hydrogen under standard pressure is oxidized to solvated protons at the left-hand electrode". The basis for an electrochemical cell, such as the galvanic cell, is always a redox reaction which can be broken down into two half-reactions: oxidation at anode (loss of electron) and reduction at cathode (gain of electron).

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Thermodynamics of Electrolytic Corrosion

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The sections in this article are

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Nernst Equation
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Pourbaix Diagrams
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Wiley2007

Use of Ti/IrO2/SnO2-Sb2O5 electrodes for ozone production

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Thermodynamics of Electrolytic Corrosion