Deactivation and selectivity for electrochemical ozone production at Ni- and Sb-doped SnO2 / Ti electrodes

Staffan Sandin; Ali Abo Hamad; Maria Cuartero; Roland De Marco; Gaston A Crespo; Joakim Backstrom; Ann Cornell

doi:10.1016/j.electacta.2020.135645

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Deactivation and selectivity for electrochemical ozone production at Ni- and Sb-doped SnO2 / Ti electrodes

Journal article

Peer reviewed

Deactivation and selectivity for electrochemical ozone production at Ni- and Sb-doped SnO2 / Ti electrodes

Staffan Sandin, Ali Abo Hamad, Maria Cuartero, Roland De Marco, Gaston A Crespo, Joakim Backstrom and Ann Cornell

Electrochimica Acta, Vol.335, 135645

2020

DOI: https://doi.org/10.1016/j.electacta.2020.135645

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Abstract

ozone

NATO

tin oxide anode

anode deactivation mechanisms

selectivity

This work reports on a time resolved study of the deactivation of electrochemical ozone production (EOP) active anodes using a novel approach to measure total ozone production. The reproducibility and change of the electrodes over time is investigated using a number of electrochemical and physical techniques. The dissolution of antimony from the surface of the nickel- and antimony-doped tin oxide (NATO) electrode is the main process behind the deactivation of the EOP. When surface antimony is depleted, the continued deactivation seems to be connected to the dissolution of nickel. Despite tin (from the coating) and titanium (from the substrate) continuously dissolving during galvanostatic polarization of the NATO electrode, our experiments point out no connection between these processes and the EOP activity. In addition, the selectivity of the electrode is affected by electrolyte penetration, accessing fresh reaction sites that are active on the EOP. The results indicate that both antimony (III) and nickel present at the surface of the NATO are responsible for the EOP activity.

Details

Title: Deactivation and selectivity for electrochemical ozone production at Ni- and Sb-doped SnO2 / Ti electrodes
Authors: Staffan Sandin (Author)
Ali Abo Hamad (Author)
Maria Cuartero (Author)
Roland De Marco (Author) - University of the Sunshine Coast
Gaston A Crespo (Author)
Joakim Backstrom (Author)
Ann Cornell (Author)
Publication details: Electrochimica Acta, Vol.335, 135645
Publisher: Elsevier Ltd.
Date published: 2020
DOI: 10.1016/j.electacta.2020.135645
ISSN: 0013-4686
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99451330502621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Electrochemistry

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