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Catalysis of the Oxygen Evolution Reaction by 4–10 nm Cobalt Nanoparticles

Locke, Edward; Jiang, Shan; Beaumont, Simon K.

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Authors

Edward Locke

Shan Jiang



Abstract

Electrolysis of water is key technology, not only for clean energy production, but to ensure a continued supply of hydrogen beyond fossil resources, essential to the manufacture of many chemical goods other than fuels. Cobalt nanomaterials have been widely identified as a promising candidate for the anode (oxygen evolution) reaction in this process, but much work has focused on applied materials or electrode design. Given the importance of oxidation state changes Co(III) → Co(IV) in the accepted reaction mechanism, in this work we look at size effects in small (4–10 nm) cobalt nanoparticles, where the ease of oxidation for lower cobalt oxidation states is known to change with particle size. To discriminate between geometric and chemical effects we have compared the catalysts in this study to others in the literature by turnover frequency (widely used in other areas of catalysis), in addition to the more commonly employed performance metric of the overpotential required to produce a current density of 10 mA cm−2. Comparisons are drawn to key examples of using well defined nanomaterials (where the surface are of cobalt sites can be estimated). This has enabled an estimated intrinsic turnover rate of ~ 1 O2 molecule per surface Co atom per second at an overpotential of 500 mV in the oxygen evolution reaction under typical alkaline reaction conditions (pH 14.0) to be identified.

Citation

Locke, E., Jiang, S., & Beaumont, S. K. (2018). Catalysis of the Oxygen Evolution Reaction by 4–10 nm Cobalt Nanoparticles. Topics in Catalysis, 61(9-11), 977-985. https://doi.org/10.1007/s11244-018-0923-4

Journal Article Type Article
Acceptance Date Dec 28, 2017
Online Publication Date Apr 9, 2018
Publication Date Jun 1, 2018
Deposit Date Apr 9, 2018
Publicly Available Date Apr 10, 2018
Journal Topics in Catalysis
Print ISSN 1022-5528
Electronic ISSN 1572-9028
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 61
Issue 9-11
Pages 977-985
DOI https://doi.org/10.1007/s11244-018-0923-4

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
© The Author(s) 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.






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