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Quasi-single-crystalline CoO hexagrams with abundant defects for highly efficient electrocatalytic water oxidation
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 92018 (English)In: Chemical Science, ISSN 2041-6520, E-ISSN 2041-6539, Vol. 9, no 34, p. 6961-6968Article in journal (Refereed) Published
Abstract [en]

Defects and structural long-range ordering have been recognized as two crucial characters for advanced electrocatalysts. However, these two features have rarely been achieved together. Herein, we report the preparation of single-crystalline CoO hexagrams and demonstrate their exceptional electrocatalytic properties for water oxidation. The quasi-single-crystalline CoO hexagrams, prepared at the critical phase transition point of -Co(OH)(2)/Co(OH)F hexagrams, possess both abundant oxygen vacancies as defects and structural long-range ordering. The matching between the b-axis of Co(OH)F crystals and the a-axis of -Co(OH)(2) crystals is critical for the formation of the CoO hexagram single crystals. The quasi-single-crystalline CoO hexagrams with abundant defects are highly efficient for water oxidation by delivering a 10 mA cm(-2) current density at a low overpotential of 269 mV in a 1 M KOH aqueous solution.

Place, publisher, year, edition, pages
2018. Vol. 9, no 34, p. 6961-6968
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Chemical Sciences
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URN: urn:nbn:se:su:diva-161078DOI: 10.1039/c8sc02294aISI: 000444554100010PubMedID: 30210770OAI: oai:DiVA.org:su-161078DiVA, id: diva2:1260062
Available from: 2018-11-01 Created: 2018-11-01 Last updated: 2018-11-01Bibliographically approved

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