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The identification of the mechanism of electrocatalytic ozone generation on Ni/Sb-SnO₂

Lookup NU author(s): Professor Paul ChristensenORCiD, Dr Pierrot Attidekou, Professor Russ Egdell, Supandee Maneelok, Professor David ManningORCiD

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).

Abstract

This paper reports a systematic study of the co-doping of SnO₂ with Sb and Ni in order to identify the mechanism responsible for the electrocatalytic generation of ozone on Ni/Sb-SnO₂. Based on interpretation of a combination of X-ray diffraction, BET surface area measurements (N₂) and thermal analysis, the formation of ozone appears to take place on particle surfaces of composite Sb-SnO₂ grains, and is controlled by diffusion of OH along internal crystallite surfaces within the grain. Sb-doped SnO₂ is inactive with respect to ozone evolution in the absence of Ni, demonstrating a synergic interaction between nickel and antimony. From XPS investigations, Sb(V) ions substitute for Sn(IV) in the lattice, with a preference for centrosymmetric coordination sites whilst the Sb(III) ions occur at grain surfaces or boundaries. Ni was not detected by XPS being located in the subsurface region at concentrations below the detection limit of the instrument. In addition to identifying a possible mechanism for ozone formation, the study resulted in the production of active nanopowders which will allow the fabrication of high surface-area anodes with the potential to exceed the space-time yields of -PbO₂ anodes, permitting the application the Ni/Sb-SnO₂ anodes in the treatment of real waters.

Publication metadata

Author(s): Christensen PA, Attidekou PS, Egdell RG, Maneelok S, Manning DAC, Palgrave R

Publication type: Article

Publication status: Published

Journal: Journal of Physical Chemistry C

Year: 2017

Volume: 121

Issue: 2

Pages: 1188-1199

Online publication date: 20/12/2016

Acceptance date: 20/12/2016

Date deposited: 20/12/2016

ISSN (print): 1932-7447

ISSN (electronic): 1932-7455

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/acs.jpcc.6b10521

DOI: 10.1021/acs.jpcc.6b10521

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