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An Oxofluoride Catalyst Comprised of Transition Metals and a Metalloid for Application in Water Oxidation
Author(s) -
Svengren Henrik,
Hu Shichao,
Athanassiadis Ioannis,
Laine Tanja M.,
Johnsson Mats
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201501452
Subject(s) - overpotential , metalloid , catalysis , materials science , transition metal , indentation , vickers hardness test , chemical engineering , metallurgy , electrochemistry , metal , chemistry , composite material , organic chemistry , microstructure , electrode , engineering
The application of the recently discovered oxofluoride solid solution (Co x Ni 1−x ) 3 Sb 4 O 6 F 6 as a catalyst for water oxidation is demonstrated. The phase exhibits a cubic arrangement of the active metal that forms oxo bridges to the metalloid with possible catalytic participation. The Co 3 Sb 4 O 6 F 6 compound proved to be capable of catalyzing 2H 2 O→O 2 +4H + +4e − at 0.33 V electrochemical and ≤0.39 V chemical overpotential with a TOF of 4.4⋅10 −3 , whereas Ni 3 Sb 4 O 6 F 6 needs a higher overpotential. Relatively large crystal cubes (0.3–0.5 mm) are easily synthesized and readily handled as they demonstrate both chemical resistance to wear after repeated in situ tests under experimental conditions, and have a mechanical hardness of 270 V0.1 using Vickers indentation. The combined properties of this compound offer a potential technical advantage for incorporation to a catalytic interface in future sustainable fuel production.