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Titolo:
Oxygen reduction mechanism at porous La1-xSrxCoO3-d cathodes/La0.8Sr0.2Ga0.8Mg0.2O2.8 electrolyte interface for solid oxide fuel cells
Autore:
Horita, T; Yamaji, K; Sakai, N; Yokokawa, H; Weber, A; Ivers-Tiffee, E;
Indirizzi:
Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan Natl Inst Mat & Chem Res Tsukuba Ibaraki Japan 3058565 aki 3058565, Japan Univ Karlsruhe, Inst Werkstoffe Elektrotech, D-76131 Karlsruhe, Germany Univ Karlsruhe Karlsruhe Germany D-76131 ech, D-76131 Karlsruhe, Germany
Titolo Testata:
ELECTROCHIMICA ACTA
fascicolo: 12, volume: 46, anno: 2001,
pagine: 1837 - 1845
SICI:
0013-4686(20010330)46:12<1837:ORMAPL>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNESIUM-DOPED LAGAO3; PEROVSKITE-TYPE OXIDES; ION CONDUCTOR; ELECTRICAL-PROPERTIES; LANTHANUM GALLATE; TEMPERATURE; STRONTIUM; SR; EXCHANGE;
Keywords:
oxygen reduction; interface reaction; polarization resistance; SOFC; cathode reaction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Horita, T Natl Inst Mat & Chem Res, 1-1 Higashi, Tsukuba, Ibaraki 3058565,Japan Natl Inst Mat & Chem Res 1-1 Higashi Tsukuba Ibaraki Japan 3058565
Citazione:
T. Horita et al., "Oxygen reduction mechanism at porous La1-xSrxCoO3-d cathodes/La0.8Sr0.2Ga0.8Mg0.2O2.8 electrolyte interface for solid oxide fuel cells", ELECTR ACT, 46(12), 2001, pp. 1837-1845

Abstract

The oxygen reduction mechanism was investigated at the porous La1-xSrxCoO3-d cathode/ La0.8Sr0.2Ga0.8Mg0.2O2.8, electrolyte interface (x=0.2, 0.3, 0.4). The polarization resistance, measured from the impedance spectra, was compared in the samples of La1-xSrxCoO3-d as functions of x, temperatures, and applied DC voltages. The polarization resistance decreased with an increase of x values in La1-xSrxCoO3-d and with the applied cathodic voltage. The polarization resistance of the higher Sr-concentration in La1-xSrxCoO3-d showed the lower dependence on cathodic overpotential. The values of the activation energy of the interface conductivity (inverse of the polarization resistance) were similar for all La1-xSrxCoO3-d samples (127-143 kJ mol(-1)) at zero applied voltage (E = 0 V). However, under cathodic polarization, the activation energy decreased as the applied voltage became more negative, which indicates a change of the reaction mechanism under cathodic polarization. Under cathodic polarization, oxide ion diffusion in the bulk La1-xSrxCoO3-d can be one of the main factors determining the reaction rates. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

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Documento generato il 10/07/20 alle ore 15:02:19