Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Effect of sintering temperature on microstructure and performance of LSM-YSZ composite cathodes
Autore:
Jorgensen, MJ; Primdahl, S; Bagger, C; 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:
SOLID STATE IONICS
fascicolo: 1-2, volume: 139, anno: 2001,
pagine: 1 - 11
SICI:
0167-2738(200101)139:1-2<1:EOSTOM>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
YTTRIA-STABILIZED ZIRCONIA; OXIDE FUEL-CELLS; SR-DOPED LAMNO3; IMPEDANCE SPECTROSCOPY; ELECTRODE PROPERTIES; KINETICS; ZRO2; SOFC;
Keywords:
lanthanum strontium manganate; yttria stabilised zirconia; sintering; microstructure; performance; solid oxide fuel cell;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Jorgensen, MJ Riso Natl Lab, Dept Mat Res, POB 49, DK-4000 Roskilde, Denmark Riso Natl Lab POB 49 Roskilde Denmark DK-4000 ilde, Denmark
Citazione:
M.J. Jorgensen et al., "Effect of sintering temperature on microstructure and performance of LSM-YSZ composite cathodes", SOL ST ION, 139(1-2), 2001, pp. 1-11

Abstract

The correlation between sintering temperature, microstructure and performance of composite electrodes comprising lanthanum strontium manganate (LSM) and yttria stabilised zirconia (YSZ) with a current collector of LSM has been studied at 1000 degreesC in air. The microstructure was found to be lessdense and to contain smaller grains as the sintering temperature was decreased in the range 1300-1150 degreesC. This increased the active triple phase boundary line (TPBL) between electrode, electrolyte and gas phase, leading to a decrease in the polarisation resistance with decreasing sintering temperature. When keeping the sintering temperature of the composite structure constant at 1300 degreesC the performance was found to improve when lowering the sintering temperature of the current collector, This may suggest that a large part of the sites, which are active to oxygen reduction, are situated at the interface between the composite and the current collector. This interface is assumed to become more important with respect to oxygen reduction as the sintering temperature of the composite layer is increased, dueto loss of porosity in this layer. An experiment with in-situ sintering ofthe composite and the current collector was performed in the temperature range 600-1050 degreesC with regular measurements during heat-up and sintering. When measuring at a reference temperature of 850 degreesC the lowest polarisation resistance was found for sintering temperatures of 950-1000 degreesC. When increasing the sintering temperature to 1050 degreesC the increase in the polarisation resistance was counterbalanced by a decrease in the series resistance, The optimum sintering temperature with respect to the initial performance is assumed to be where good physical and electrical contact between LSM and YSZ is obtained in addition to a long TPBL, When the optimum sintering temperature for obtaining high initial performance is found,the next step is to study the long term stability of the electrode structure during operation. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 08:06:20