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Highly active electrocatalysis by cobalt tetraphenylporphyrin incorporated in a Nafion membrane for proton reduction
Author(s) -
Abe Toshiyuki,
Taguchi Fumio,
Imaya Hiroshi,
Zhao Feng,
Zhang Jian,
Kaneko Masao
Publication year - 1998
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/(sici)1099-1581(199809)9:9<559::aid-pat818>3.0.co;2-1
Subject(s) - nafion , tetraphenylporphyrin , cobalt , electrocatalyst , catalysis , porphyrin , membrane , aqueous solution , photochemistry , chemistry , polymer chemistry , electron transfer , proton exchange membrane fuel cell , materials science , inorganic chemistry , electrode , electrochemistry , organic chemistry , biochemistry
Electrocatalytic H + reduction was studied with cobalt tetraphenylporphyrin (CoTPP) incorporated in a Nafion membrane coated on a Pt electrode (denoted as Pt/Nf[CoTPP]). It was found that Pt/Nf[CoTPP] shows an efficient catalytic activity to produce H 2 around the theoretical H + /H 2 redox potential (−0.25 V v. Ag/AgCl in a pH 1.01 aqueous solution), and that its catalytic activity is remarkably higher than a neat CoTPP film and a conventional Pt catalyst. The amount of the H 2 produced decreased with increasing CoTPP concentration in the membrane ([CoTPP] Nf ]). The ratio of electroactive Co II TPP was independent of its concentration, showing that the present electron transfer process takes place via physical diffusion of the molecule. The intrinsic turnover number (TN int ) of the CoTPP to produce H 2 , based on the electroactive amounts of the CoTPP, decreased with increasing [CoTPP] Nf . The catalysis was discussed in terms of the characteristic of the Nafion membrane. © 1998 John Wiley & Sons, Ltd.