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The electrode kinetics of oxygen reduction: A case study. The corrosion of copper and its alloys in aqueous chloride solution at a smooth rotating disc electrode

The electrode kinetics of oxygen reduction: A case study. The corrosion of copper and its alloys in aqueous chloride solution at a smooth rotating disc electrode
The electrode kinetics of oxygen reduction: A case study. The corrosion of copper and its alloys in aqueous chloride solution at a smooth rotating disc electrode
The importance of oxygen reduction in corrosion processes is emphasized. The complex mechanism of this electrode process, due to 2- or 4-electron pathways, surface adsorption, and surface oxide formation resulting in possible passivity, is highlighted. Oxygen reduction can be controlled by charge (electron) transfer, mass transport of dissolved oxygen to the electrode surface, or both (mixed control). In practice, mixed control is common. Quantitative studies of the electrode kinetics of oxygen reduction at copper and its alloys and its simulation are illustrated by the use of a rotating disk electrode in aqueous chloride electrolytes at a temperature of 25°C. A variety of techniques is used to calculate the corrosion current density. The diffusion coefficient of dissolved oxygen if estimated via the Levich equation (under complete mass transfer control) and the Koutecky–Levich equation (under mixed control) is 1.9 ± 0.2 × 10−5 cm2 s−1 at 25°C. Other important cases of oxygen reduction in electrochemical technology are indicated, including gas and dissolved oxygen sensors, the negative electrode of metal-air batteries and fuel cell cathode reactions. Areas deserving further research and development are identified while broader subject areas include diverse bifunctional oxygen electrocatalysts for reversible batteries and regenerative fuel cells.
Corrosion, rotating disc electrode, Copper, oxygen reduction reaction, mass transport, Levich equation, koutecky–levich equation, nickel aluminium bronze, nickel aluminium bronze (nab), cupronickel
490-503
Elsevier
Walsh, Frank
309528e7-062e-439b-af40-9309bc91efb2
Arenas Martinez, Luis Fernando
6e7e3d10-2aab-4fc3-a6d4-63a6614d0403
Kear, Gareth
ff3ac962-2240-4535-a240-2394ce16eef0
Di Quarto, Francesco
Walsh, Frank
309528e7-062e-439b-af40-9309bc91efb2
Arenas Martinez, Luis Fernando
6e7e3d10-2aab-4fc3-a6d4-63a6614d0403
Kear, Gareth
ff3ac962-2240-4535-a240-2394ce16eef0
Di Quarto, Francesco

Walsh, Frank, Arenas Martinez, Luis Fernando and Kear, Gareth (2018) The electrode kinetics of oxygen reduction: A case study. The corrosion of copper and its alloys in aqueous chloride solution at a smooth rotating disc electrode. In, Di Quarto, Francesco (ed.) Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry. Elsevier, pp. 490-503. (doi:10.1016/B978-0-12-409547-2.13771-0).

Record type: Book Section

Abstract

The importance of oxygen reduction in corrosion processes is emphasized. The complex mechanism of this electrode process, due to 2- or 4-electron pathways, surface adsorption, and surface oxide formation resulting in possible passivity, is highlighted. Oxygen reduction can be controlled by charge (electron) transfer, mass transport of dissolved oxygen to the electrode surface, or both (mixed control). In practice, mixed control is common. Quantitative studies of the electrode kinetics of oxygen reduction at copper and its alloys and its simulation are illustrated by the use of a rotating disk electrode in aqueous chloride electrolytes at a temperature of 25°C. A variety of techniques is used to calculate the corrosion current density. The diffusion coefficient of dissolved oxygen if estimated via the Levich equation (under complete mass transfer control) and the Koutecky–Levich equation (under mixed control) is 1.9 ± 0.2 × 10−5 cm2 s−1 at 25°C. Other important cases of oxygen reduction in electrochemical technology are indicated, including gas and dissolved oxygen sensors, the negative electrode of metal-air batteries and fuel cell cathode reactions. Areas deserving further research and development are identified while broader subject areas include diverse bifunctional oxygen electrocatalysts for reversible batteries and regenerative fuel cells.

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Encyclopedia of Interfacial Chemistry Revised PURE - Accepted Manuscript
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Published date: 23 April 2018
Keywords: Corrosion, rotating disc electrode, Copper, oxygen reduction reaction, mass transport, Levich equation, koutecky–levich equation, nickel aluminium bronze, nickel aluminium bronze (nab), cupronickel

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Local EPrints ID: 423057
URI: http://eprints.soton.ac.uk/id/eprint/423057
PURE UUID: 56b77b51-98d7-42bb-ab71-9e9aec6b4858

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Date deposited: 13 Aug 2018 16:30
Last modified: 07 May 2020 16:31

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Author: Frank Walsh
Author: Gareth Kear
Editor: Francesco Di Quarto

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