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Perfluorinated Cobalt Phthalocyanine Effectively Catalyzes Water Electrooxidation
Author(s) -
Morlanés Natalia,
Joya Khurram S.,
Takanabe Kazuhiro,
Rodionov Valentin
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201403015
Subject(s) - chemistry , electrocatalyst , cobalt , phthalocyanine , inorganic chemistry , electrochemistry , catalysis , cobalt oxide , tin oxide , electrolysis , oxide , fluorine , electrode , organic chemistry , electrolyte
Efficient electrocatalysis of water oxidation under mild conditions at neutral pH was achieved by a fluorinated cobalt phthalocyanine immobilized on fluorine‐doped tin oxide (FTO) surfaces with an onset potential at 1.7 V vs. RHE. Spectroscopic, electrochemical, and inhibition studies indicate that phthalocyanine molecular species are the operational active sites. Neither free cobalt ions nor heterogeneous cobalt oxide particles or films were observed. During long‐term controlled‐potential electrolysis at 2 V vs. RHE (phosphate buffer, pH 7), electrocatalytic water oxidation was sustained for at least 8 h (TON ≈ 1.0 × 10 5 ), producing about 4 μmol O 2 h –1 cm –2 with a turnover frequency (TOF) of about 3.6 s –1 and no measurable catalyst degradation.