Effect of La0.6Sr0.4Co0.2Fe0.8O3-δ microstructure on oxygen surface exchange kinetics

被引：17

作者：

Develos-Bagarinao, Katherine ^{[1
]}

Kishimoto, Haruo ^{[1
]}

De Vero, Jeffrey ^{[1
]}

Yamaji, Katsuhiko ^{[1
]}

Horita, Teruhisa ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Res Inst Energy Conservat, AIST Cent 5,1-1-1 Higashi, Tsukuba, Ibaraki 3058565, Japan

来源：

SOLID STATE IONICS | 2016年 / 288卷

基金：

日本科学技术振兴机构;

关键词：

Solid oxide fuel cells; Thin films; Pulsed laser deposition; La0.6Sr0.4Co0.2Fe0.8O3-delta; Oxygen surface exchange; Gd2O3-doped CeO2; IONIC-CONDUCTIVITY; SEGREGATION; INTERFACES; YSZ;

D O I：

10.1016/j.ssi.2016.01.008

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：

La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) is a mixed ionic-electronic conducting perovskite (ABO(3)) material which has attracted significant research interest in recent years as a cathode for solid oxide fuel cell (SOFC) applications at intermediate temperatures (500 C-750 degrees C). Fundamental understanding of the oxygen surface exchange kinetics and diffusion in LSCF cathodes is necessary to optimize the cell performance at the required operating temperatures. In this study, we controlled the surface microstructure and crystalline orientation of LSCF thin films on (100) Gd2O3-doped CeO2 thin films (GDC) prepared by pulsed laser deposition on yttria-stabilized zirconia (YSZ) single crystal substrates. Tailoring of the LSCF microstructure was achieved by modifying the underlying GDC thin film surface morphology and microstructure. To clarify the effect of the LSCF microstructure on its oxygen surface exchange kinetics, we employed the O-18/O-16 oxygen isotope exchange technique in conjunction with secondary ion mass spectroscopy (SIMS) depth profile analysis. Comparison of the qualitative features of the measured concentration of the O-18 profile and evaluation of the oxygen surface exchange coefficient k* were performed and the results correlated to the LSCF microstructure. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：6 / 9

页数：4

共 18 条

[1]

[Anonymous], THESIS

[2]

[Anonymous], 1980, MATH DIFFUSION

[3] Determination of Surface Exchange Coefficients of LSM, LSCF, YSZ, GDC Constituent Materials in Composite SOFC Cathodes [J].

Armstrong, E. N. ;

Duncan, K. L. ;

Oh, D. J. ;

Weaver, J. F. ;

Wachsman, E. D. .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2011, 158 (05) :B492-B499

[4] Nanoscale effects on ion conductance of layer-by-layer structures of gadolinia-doped ceria and zirconia [J].

Azad, S ;

Marina, OA ;

Wang, CM ;

Saraf, L ;

Shutthanandan, V ;

McCready, DE ;

El-Azab, A ;

Jaffe, JE ;

Engelhard, MH ;

Peden, CHF ;

Thevuthasan, S .

APPLIED PHYSICS LETTERS, 2005, 86 (13) :1-3

[5]

Brandon D., 1999, MICROSTRUCTURAL CHAR, P59

[6]

Develos-Bagarinao K., 2015, ECS Transactions, V68, P1003, DOI 10.1149/06801.1003ecst

[7] Evidence for enhanced oxygen surface exchange reaction in nanostructured Gd2O3-doped CeO2 films [J].

Develos-Bagarinao, Katherine ;

Kishimoto, Haruo ;

Yamaji, Katsuhiko ;

Horita, Teruhisa ;

Yokokawa, Harumi .

NANOTECHNOLOGY, 2015, 26 (21)

[8] Surface segregation and poisoning in materials for low-temperature SOFCs [J].

Druce, John ;

Tellez, Helena ;

Hyodo, Junji .

MRS BULLETIN, 2014, 39 (09) :810-815

[9] Colossal ionic conductivity at interfaces of epitaxial ZrO2:Y2O3/SrTiO3 heterostructures [J].

Garcia-Barriocanal, J. ;

Rivera-Calzada, A. ;

Varela, M. ;

Sefrioui, Z. ;

Iborra, E. ;

Leon, C. ;

Pennycook, S. J. ;

Santamaria, J. .

SCIENCE, 2008, 321 (5889) :676-680

[10] Visualization of oxide ionic diffusion at cathode/interlayer/electrolyte interfaces in real flat-tube SOFC cells-stack [J].

Horita, Teruhisa ;

Cho, DoHyung ;

Shimonosono, Taro ;

Kishimoto, Haruo ;

Yamaji, Katsuhiko ;

Brito, Manuel E. ;

Yokokawa, Harumi .

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 2013, 121 (1410) :195-199

← 1 2 →