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A transition metal oxofluoride offering advantages in electrocatalysis and potential use in applications
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).
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Number of Authors: 5
2016 (English)In: Faraday discussions (Online), ISSN 1359-6640, E-ISSN 1364-5498, Vol. 188, 481-498 p.Article in journal (Refereed) Published
Abstract [en]

The recently described solid solution ( Co,Ni,Mn)(3)Sb4O6F6 has proved stable and efficient as a catalyst for electrocatalytic water oxidation. The end component Co3Sb4O6F6 was found to be most efficient, maintaining a current density of j = 10 mA cm(-2) at an overpotential of 443 mV with good capability. At this current density, O-2 and H-2 were produced in the ratio 1 : 2 without loss of faradaic current against a Pt-cathode. A morphological change in the crystallite surface was observed after 0.5 h, however, even after 64.5 h, the overall shape and size of the small crystallites were unaffected and the electrolyte contained only 0.02 at% Co. It was also possible to conclude from in situ EXAFS measurements that the coordination around Co did not change. The oxofluorides express both hydrophilic and hydrophobic surface sites, incorporate a flexible metalloid element and offer the possibility of a mechanism that differs from other inorganic catalytic pathways previously described.

Place, publisher, year, edition, pages
2016. Vol. 188, 481-498 p.
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Chemical Sciences
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URN: urn:nbn:se:su:diva-133258DOI: 10.1039/c5fd00169bISI: 000380099200027PubMedID: 27064139OAI: oai:DiVA.org:su-133258DiVA: diva2:958256
Available from: 2016-09-06 Created: 2016-09-05 Last updated: 2016-09-06Bibliographically approved

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Svengren, HenrikAthanassiadis, IoannisAli, S. ImranJohnsson, Mats
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