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Volume 188, 2016
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A transition metal oxofluoride offering advantages in electrocatalysis and potential use in applications

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Abstract

The recently described solid solution (Co,Ni,Mn)3Sb4O6F6 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, O2 and H2 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.

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Publication details

The article was received on 16 Nov 2015, accepted on 02 Dec 2015 and first published on 03 Dec 2015


Article type: Paper
DOI: 10.1039/C5FD00169B
Citation: Faraday Discuss., 2016,188, 481-498
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    A transition metal oxofluoride offering advantages in electrocatalysis and potential use in applications

    H. Svengren, N. Torapava, I. Athanassiadis, S. I. Ali and M. Johnsson, Faraday Discuss., 2016, 188, 481
    DOI: 10.1039/C5FD00169B

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