Direct Synthesis of Two Inorganic Catalysts on Carbon Fibres for the Electrocatalytic Oxidation of Water. Issue 3 (10th November 2016)

• Record Type: Journal Article
• Authors: Svengren, Henrik; Jansson, Kjell; Grins, Jekabs; Wan, Wei; Torapava, Natallia; Johnsson, Mats
• Is Part Of: Chemistry. Volume 23:Issue 3(2017)
• Page Start: 568
• Page End: 575
• Publication Date: 2016-11-10
• Subjects: antimony -- cobalt -- electrochemistry -- inorganic catalysts -- water oxidation; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201603085
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Two electrodes for anodic water oxidation made by direct synthesis of inorganic catalysts onto conductive carbon fibre sheets are evaluated. As catalysts two Co‐ and Sb‐containing phases were tested, that is, Co3 Sb4 O6 F6 and the new compound CoSbO4 . The compounds express large differences in their morphology: CoSbO4 grows as thin needles whereas Co3 Sb4 O6 F6 grows as larger facetted crystals. Despite the smaller surface area the latter compound shows a better catalytic performance. When the compound Co3 Sb4 O6 F6 was used it gave a low increase of +0.028 mV h −1 at an overpotential of η =472 mV after 10 h and a stability of +0.48 mV h −1 at an overpotential of η =488 mV after 60 h. The leakages of Co and Sb were negligible and only <0.001 at % Co and approximately 0.02 at % Sb were detected in the electrolyte. Abstract : Water oxidation catalysts : Electrodes for the anodic water oxidation are made by direct synthesis of the catalysts onto conductive carbon fibre sheets. The use of Co3 Sb4 O6 F6 (see figure) gave a low increase +0.028 mV h −1 at an overpotential of η =472 mV after 10 h and a stability of +0.48 mV h −1 at an overpotential of η =488 mV after 60 h.