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A comparison of several meso ‐tetraalkyl cobalt porphyrins as catalysts for the electroreduction of dioxygen
Author(s) -
Yuasa M.,
Nishihara R.,
Shi C.,
Anson F. C.
Publication year - 2001
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.136
Subject(s) - cobalt , catalysis , alkyl , adsorption , electrochemistry , molecule , chemistry , graphite , porphyrin , polymer chemistry , medicinal chemistry , photochemistry , electrode , inorganic chemistry , organic chemistry
A set of cobalt porphyrins containing alkyl substituents in their meso sites were synthesized and compared as catalysts for the electroreduction of O 2 when adsorbed on the surface of graphite electrodes. The meso substituents examined included ethyl, propyl, n‐butyl and n‐pentyl. All but the last exhibited high catalytic activity for the electroreduction of O 2 by four electrons. The catalytic activity was attributed to spontaneous aggregation of the porphyrins to produce structures in which pairs of cobalt centers could be bridged by O 2 molecules as previously observed for the unsubstituted and tetramethyl analogs. Copyright © 2001 John Wiley & Sons, Ltd.