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The Aurivillius Compound CoBi2O2F4 - an Efficient Catalyst for Electrolytic Water Oxidation after Liquid Exfoliation
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-4319-1540
Number of Authors: 32019 (English)In: ChemCatChem, ISSN 1867-3880, E-ISSN 1867-3899, Vol. 11, no 24, p. 6105-6110Article in journal (Refereed) Published
Abstract [en]

Investigation of new high-efficiency catalysts for the oxygen evolution reaction (OER) is important for propelling the practical applications of water splitting. Here we report the Aurivillius compound CoBi2O2F4 to be a novel catalyst for catalytic OER. After liquid exfoliation of CoBi2O2F4 crystals in isopropanol, the resulting thin sheets deliver a low overpotential of 334 mV and a small Tafel slope of 47 mV dec(-1) for catalytic OER, exhibiting substantially higher activity and faster kinetics compared with as-synthesized crystals. This attributes to the increase in accessible surface area and dangling bonds on the edges providing more active sites exposed on the surface after exfoliation. The positive effects of F- anions to benefit OH- adsorption/combination and p-block Bi3+ cations to direct reactants to preferred sites are proposed to synergistically improve the Co-active centers for catalysis; based on this, the OER reaction mechanism on this new catalyst is discussed.

Place, publisher, year, edition, pages
2019. Vol. 11, no 24, p. 6105-6110
Keywords [en]
cobalt, bismuth, fluoride, liquid exfoliation, oxygen evolution
National Category
Chemical Sciences
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-176562DOI: 10.1002/cctc.201901561ISI: 000494506500001OAI: oai:DiVA.org:su-176562DiVA, id: diva2:1379622
Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2020-02-21Bibliographically approved

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Yu, XiaowenMitoudi-Vagourdi, EleniJohnsson, Mats
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