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Titolo:
Oxygen reduction sites and diffusion paths at La0.9Sr0.1MnO3-x/yttria-stabilized zirconia interface for different cathodic overvoltages by secondary-ion mass spectrometry
Autore:
Horita, T; Yamaji, K; Sakai, N; Yokokawa, H; Kawada, T; Kato, T;
Indirizzi:
Natl Inst Mat & Chem Res, Ibaraki, Osaka 3058565, Japan Natl Inst Mat & Chem Res Ibaraki Osaka Japan 3058565 Osaka 3058565, Japan Tohoku Univ, Res Inst Sci Measurements, Aoba Ku, Sendai, Miyagi 9808577, Japan Tohoku Univ Sendai Miyagi Japan 9808577 Ku, Sendai, Miyagi 9808577, Japan ETL, Electrotech Lab, Ibaraki, Osaka 305, Japan ETL Ibaraki Osaka Japan 305 L, Electrotech Lab, Ibaraki, Osaka 305, Japan
Titolo Testata:
SOLID STATE IONICS
fascicolo: 1-2, volume: 127, anno: 2000,
pagine: 55 - 65
SICI:
0167-2738(200001)127:1-2<55:ORSADP>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHEMICAL THERMODYNAMIC CONSIDERATIONS; IMPEDANCE SPECTROSCOPY; ELECTRODE-KINETICS; AIR ELECTRODE; NONSTOICHIOMETRY; REACTIVITY; STABILITY; LA; ZR;
Keywords:
(La, Sr)MnO3 mesh; YSZ; SOFC; SIMS; oxygen reduction; oxygen diffusion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Horita, T Natl Inst Mat & Chem Res, 1-1 Higashi, Ibaraki, Osaka 3058565, Japan Natl Inst Mat & Chem Res 1-1 Higashi Ibaraki Osaka Japan 3058565
Citazione:
T. Horita et al., "Oxygen reduction sites and diffusion paths at La0.9Sr0.1MnO3-x/yttria-stabilized zirconia interface for different cathodic overvoltages by secondary-ion mass spectrometry", SOL ST ION, 127(1-2), 2000, pp. 55-65

Abstract

Oxygen reduction active sites were investigated at the interface of O-2/La-0.9,Sr-0.1,MnO3-x (LSM)/yttria-stabilized zirconia (YSZ) for three different overvoltages of cathodic polarization (n = - 0.336 V, n = - 0.185 V, andn = - 0.090 V versus reference electrode). Isotopic oxygen (O-16/O-18) exchange under cathodic polarization and secondary ion mass spectrometry (SIMS) technique were examined to visualize the oxygen incorporation/reduction active sites. The LSM mesh pattern electrode was prepared to define the areaand length of contact between LSM mesh and YSZ. Under cathodic polarization of n = - 0.336 V, oxide ions can diffuse through the LSM to take part in the electrode reaction. From the SIMS images of YSZ surface, the active sites for oxygen reduction/incorporation are distributed in spots at the position where the LSM mesh was attached. Especially, O-2/LSM/YSZ three phase boundary (TPB) is the main active site for oxygen incorporation/ reduction, although some spots of high O-18 concentration were observed at the center of the LSM mesh part. Under the lower polarization (n = - 0.185 V, and n = -0.090 V), oxide ions did not diffuse through the LSM mesh. SIMS imaging analysis of YSZ surface showed high O-18 concentration spots around the center of the LSM mesh part. The distribution of ionic currents at the surface of YSZ affects the distribution of active sites for oxygen incorporation. (C) 2000 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 29/09/20 alle ore 20:39:44