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Titolo:
The mechanism of porous Sm0.5Sr0.5CoO3 cathodes used in solid oxide fuel cells
Autore:
Koyama, M; Wen, CJ; Masuyama, T; Otomo, J; Fukunaga, H; Yamada, K; Eguchi, K; Takahashi, H;
Indirizzi:
Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, Japan Univ Tokyo Tokyo Japan 1138656 yst Engn, Bunkyo Ku, Tokyo 1138656, Japan Shinshu Univ, Dept Fine Mat Engn, Nagano 3868567, Japan Shinshu Univ Nagano Japan 3868567 t Fine Mat Engn, Nagano 3868567, Japan
Titolo Testata:
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
fascicolo: 7, volume: 148, anno: 2001,
pagine: A795 - A801
SICI:
0013-4651(200107)148:7<A795:TMOPSC>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
YTTRIA-STABILIZED ZIRCONIA; SR-DOPED LAMNO3; OXYGEN REDUCTION; REACTION-KINETICS; ELECTRODE; DEPENDENCE; EXCHANGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Koyama, M Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, JapanUniv Tokyo Tokyo Japan 1138656 Bunkyo Ku, Tokyo 1138656, Japan
Citazione:
M. Koyama et al., "The mechanism of porous Sm0.5Sr0.5CoO3 cathodes used in solid oxide fuel cells", J ELCHEM SO, 148(7), 2001, pp. A795-A801

Abstract

Overpotential and ac impedance spectra were measured to construct a model to describe porous Sm1-xSrxCoO3 (SSC) cathodes for solid oxide fuel cells (SOFCs). Analysis of the impedance spectra revealed that there art: three processes involved in the overall electrochemical reaction: (i) the adsorption/desorption process on the surface of the electrode, (ii) the ionic conduction in the bulk SSC, and (iii) the diffusion of oxygen in the gas phase. It was found that in air atmosphere, the reaction processes (i) and (ii) were dominant, while the diffusion process of gaseous oxygen was fast enough not to limit the overall reaction rate. A reaction model for the porous SSC cathodes used in SOFCs was proposed to determine the electrode resistance by taking processes (i) and (ii) into account. It was found that our model explained the experimental results well. These results suggested the possibility of using our model to describe the cathodes with high ionic conductivity and to design the high-performance cathode systematically. The validity of the analysis by conventional equivalent circuit was also discussed. (C) 2001 The Electrochemical Society.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 10:08:58