An Oxofluoride Catalyst Comprised of Transition Metals and a Metalloid for Application in Water Oxidation

作者：Svengren Henrik; Hu Shichao; Athanassiadis Ioannis; Laine Tanja M; Johnsson Mats^*

来源：Chemistry - A European Journal, 2015, 21(37): 12991-12995.

DOI：10.1002/chem.201501452

• cobalt
• nickel
• oxofluorides
• solid solutions
• water oxidation catalysts

The application of the recently discovered oxofluoride solid solution (CoxNi1-x)(3)Sb4O6F6 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 Co3Sb4O6F6 compound proved to be capable of catalyzing 2H(2)OO(2)+4H(+)+4e(-) at 0.33V electrochemical and 0.39V chemical overpotential with a TOF of 4.410(-3), whereas Ni3Sb4O6F6 needs a higher overpotential. Relatively large crystal cubes (0.3-0.5mm) are easily synthesized and readily handled as they demonstrate both chemical resistance to wear after repeated insitu tests under experimental conditions, and have a mechanical hardness of 270V0.1 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.

• 出版日期2015-9-7