Effect of phase transition on high-temperature electrical properties of GdBaCo2O5+x layered perovskite

被引：109

作者：

Tarancon, A. ^{[1
,2
]}

Marrero-Lopez, D. ^{[2
]}

Pena-Martinez, J. ^{[2
]}

Ruiz-Morales, J. C. ^{[2
]}

Nunez, P. ^{[2
]}

机构：

[1] Univ Barcelona, EME CeRMAE UB IN2, Dept Elect, E-08028 Barcelona, Spain

[2] Univ La Laguna, Dept Inorgan Chem, San Cristobal la Laguna 38200, Spain

来源：

SOLID STATE IONICS | 2008年 / 179卷 / 17-18期

关键词：

SOFC; cathode; layered perovskite; GBCO; phase transition;

D O I：

10.1016/j.ssi.2008.04.028

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of the structural phase transition on the electrical and electrochemical properties of GdBaCo2O5+x has been analysed in order to evaluate its suitability as an electrode material for high-temperature applications, in particular as a cathode for Solid Oxide Fuel Cells (SOFCs). X-ray diffraction evolution with the temperature and differential scanning calorimetry were used to determine Structural features of the phase transition, e.g. phases symmetry, thermal expansion coefficients, transition temperatures and enthalpy changes. Four-probe dc-electrical measurements of dense pellets of GdBaCo2O5+x and electrochemical characterization by means of impedance spectroscopy as a part of a symmetrical cell (GdBaCo2O5+x/La0.9Sr0.1Ga0.8Mg0.2O3-delta/GdBaCo2O5+x) were carried out yielding high stability of this material across the mentioned phase transition. The thermal relation of the oxygen stoichiometry with the structural and electrical features revealed the importance of the oxygenation/deoxygenation processes taking place in this material. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：611 / 618

页数：8

共 25 条

[1] Mechanism and kinetics of oxygen reduction on porous La1-xSrxCoO3-δ electrodes [J].

Adler, SB .

SOLID STATE IONICS, 1998, 111 (1-2) :125-134

[2] Oxygen diffusion and transport properties in non-stoichiometric Ln2-xNiO4+δ oxides [J].

Boehm, E ;

Bassat, JM ;

Dordor, P ;

Mauvy, F ;

Grenier, JC ;

Stevens, P .

SOLID STATE IONICS, 2005, 176 (37-38) :2717-2725

[3] Recent advances in materials for fuel cells [J].

Brandon, NP ;

Skinner, S ;

Steele, BCH .

ANNUAL REVIEW OF MATERIALS RESEARCH, 2003, 33 :183-213

[4] Solid oxide fuel cell cathodes: Polarization mechanisms and modeling of the electrochemical performance [J].

Fleig, J .

ANNUAL REVIEW OF MATERIALS RESEARCH, 2003, 33 :361-382

[5] Selective spin-state and metal-insulator transitions in GdBaCo2O5.5 [J].

Frontera, C ;

García-Muñoz, JL ;

Llobet, A ;

Mañosa, L ;

Aranda, MAG .

JOURNAL OF SOLID STATE CHEMISTRY, 2003, 171 (1-2) :349-352

[6]

Johnson D., 2002, ZVIEW ZPLOT SOFTWARE

[7] Anisotropic magnetic, magnetoresistance, and electrotransport properties of GdBaCo2O5.5 single crystals -: art. no. 214421 [J].

Khalyavin, DD ;

Barilo, SN ;

Shiryaev, SV ;

Bychkov, GL ;

Troyanchuk, IO ;

Furrer, A ;

Allenspach, P ;

Szymczak, H ;

Szymczak, R .

PHYSICAL REVIEW B, 2003, 67 (21)

[8] Rapid oxygen ion diffusion and surface exchange kinetics in PrBaCo2O5+x with a perovskite related structure and ordered A cations [J].

Kim, G. ;

Wang, S. ;

Jacobson, A. J. ;

Reimus, L. ;

Brodersen, P. ;

Mims, C. A. .

JOURNAL OF MATERIALS CHEMISTRY, 2007, 17 (24) :2500-2505

[9] Thermoelectric power of HoBaCo2O5.5:: Possible evidence of the spin blockade in cobaltites -: art. no. 026401 [J].

Maignan, A ;

Caignaert, V ;

Raveau, B ;

Khomskii, D ;

Sawatzky, G .

PHYSICAL REVIEW LETTERS, 2004, 93 (02) :026401-1

[10] Structural and magnetic studies of ordered oxygen-deficient perovskites LnBaCo2O5+δ, closely related to the "112" structure [J].

Maignan, A ;

Martin, C ;

Pelloquin, D ;

Nguyen, N ;

Raveau, B .

JOURNAL OF SOLID STATE CHEMISTRY, 1999, 142 (02) :247-260

← 1 2 3 →