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Titolo:
Electrochemical properties of Pt-modified nano-honeycomb diamond electrodes
Autore:
Honda, K; Yoshimura, M; Rao, TN; Tryk, DA; Fujishima, A; Yasui, K; Sakamoto, Y; Nishio, K; Masuda, H;
Indirizzi:
Univ Tokyo, Sch Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan UnivTokyo Tokyo Japan 1138656 ppl Chem, Bunkyo Ku, Tokyo 1138656, Japan Tokyo Metropolitan Univ, Fac Engn, Dept Ind Chem, Tokyo 1920397, Japan Tokyo Metropolitan Univ Tokyo Japan 1920397 d Chem, Tokyo 1920397, Japan
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 514, anno: 2001,
pagine: 35 - 50
Fonte:
ISI
Lingua:
ENG
Soggetto:
POROUS CARBON-FILMS; OXYGEN REDUCTION; ELECTROCATALYTIC OXIDATION; PLATINUM-ELECTRODES; METHANOL OXIDATION; ALKALINE-SOLUTION; THIN-FILMS; IMPEDANCE; TEMPERATURE; BEHAVIOR;
Keywords:
nano-honeycomb diamond; Pt nanoparticles; alcohol oxidation; oxygen reduction; Ac impedance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Fujishima, A Univ Tokyo, Sch Engn, Dept Appl Chem, Bunkyo Ku, 7-3-1 Hongo,Tokyo 1138656, Japan Univ Tokyo 7-3-1 Hongo Tokyo Japan 1138656 yo 1138656, Japan
Citazione:
K. Honda et al., "Electrochemical properties of Pt-modified nano-honeycomb diamond electrodes", J ELEC CHEM, 514(1-2), 2001, pp. 35-50

Abstract

The electrocatalytic behavior of boron-doped nanoporous honeycomb diamond films modified with Pt nanoparticles (10-150 nm) was examined with cyclic voltammetry (CV) and electrochemical impedance spectroscopy in acid solution. For two such films as well as an as-deposited film, the average number ofexposed surface Pt atoms was estimated from CV to be 1.07(+/-0.05) x 10(15) cm(-2) (real area, as estimated by SEM). These electrodes exhibited high electroactivity for hydrogen adsorption and oxidation of several alcohols, The current density (geometric basis) in the CV for methanol oxidation at aPt-modified porous film with a pore diameter of 400 nm and a pore depth of3 mum, was greatly enhanced, by a factor of 16, in comparison to the values obtained with a bulk Pt electrode. This enhancement is attributed to boththe high surface area of the nano-honeycomb structure and the high electrocatalytic activity of Pt nanoparticles dispersed inside the pores. The electrocatalytic activities of the Pt-modified nano-honeycomb films were found to be dependent on the structural parameters of the honeycomb pores and themolecular sizes of the alcohols. Interestingly, ac impedance measurements have indicated a decrease in the penetration depths for a Pt-modified porous film with a pore diameter of 60 nm with increasing alcohol size, and an increase in the reaction resistances for ethanol oxidation with decreasing pore diameter. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 03/07/20 alle ore 16:18:35