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Direct Synthesis of Two Inorganic Catalysts on Carbon Fibres for the Electrocatalytic Oxidation of Water
Author(s) -
Svengren Henrik,
Jansson Kjell,
Grins Jekabs,
Wan Wei,
Torapava Natallia,
Johnsson Mats
Publication year - 2017
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.201603085
Subject(s) - overpotential , catalysis , electrolyte , carbon fibers , inorganic chemistry , chemical engineering , materials science , chemistry , anode , electrode , electrochemistry , organic chemistry , composite material , composite number , engineering
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, Co 3 Sb 4 O 6 F 6 and the new compound CoSbO 4 . The compounds express large differences in their morphology: CoSbO 4 grows as thin needles whereas Co 3 Sb 4 O 6 F 6 grows as larger facetted crystals. Despite the smaller surface area the latter compound shows a better catalytic performance. When the compound Co 3 Sb 4 O 6 F 6 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.