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Titolo:
Impedance of solid oxide fuel cell LSM/YSZ composite cathodes
Autore:
Jorgensen, MJ; Mogensen, M;
Indirizzi:
Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark Riso Natl Lab Roskilde Denmark DK-4000 at Res, DK-4000 Roskilde, Denmark
Titolo Testata:
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
fascicolo: 5, volume: 148, anno: 2001,
pagine: A433 - A442
SICI:
0013-4651(200105)148:5<A433:IOSOFC>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
YTTRIA-STABILIZED ZIRCONIA; SR-DOPED LAMNO3; OXYGEN REDUCTION; ELECTRODE-KINETICS; AIR ELECTRODE; SOFC CATHODES; INTERFACE; SPECTROSCOPY; MICROSTRUCTURE; DIFFUSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Jorgensen, MJ Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark Riso Natl Lab Roskilde Denmark DK-4000 0 Roskilde, Denmark
Citazione:
M.J. Jorgensen e M. Mogensen, "Impedance of solid oxide fuel cell LSM/YSZ composite cathodes", J ELCHEM SO, 148(5), 2001, pp. A433-A442

Abstract

A number of lanthanum strontium manganate/yttria-stabilized zirconia (LSM/YSZ) composite electrodes are produced with varying composition and processing parameters. The composites are investigated using impedance spectroscopy. General trends related to the oxygen reduction process are extracted from the impedance data. Literature concerning kinetic studies of LSM/YSZ electrodes and related systems is reviewed and compared to new experimental data. From this it is found that at least five processes affect the impedance. Going from high to low frequency, these processes are (i), (ii) two geometry-related contributions interpreted as transport across LSM/YSZ interfacesand through the YSZ of the composite, (iii) a process reflecting competitive reaction steps such as bond breaking and surface diffusion, (iv) gas diffusion in a stagnant gas layer above the electrode structure, and (v) an activation process (inductive) presumably located at the triple phase boundary of electrode, electrolyte, and gas phase. (C) 2001 The Electrochemical Society.

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Documento generato il 24/09/20 alle ore 11:07:45