Synthesis and characterization of La0.6Sr0.4Fe0.8Cu0.2O3
; oxide as cathode for Intermediate Temperature Solid Oxide Fuel Cells

S. VÁZQUEZ ; J. BASBÚS; A. SOLDATI; F. NAPOLITANO; A. SERQUIS; L. SUESCUM

JOURNAL OF SOLID STATE CHEMISTRY

ACADEMIC PRESS INC ELSEVIER SCIENCE

Lugar: Amsterdam; Año: 2015 vol. 228 p. 208 - 213

0022-4596

NanocrystallineLa0.6Sr0.4Fe0.8Cu0.2O3δ LSFCu) material was synthetized by combustion method using EDTA as fuel/chelating agent andNH4NO3 as combustion promoter. Structural characterization using thermodiffraction data allowed to determine a reversible phase transition a t425 1C from a lowtemperature R-3c phase to a high temperature Pm-3m phase and to calculate the thermal expansion coefficient (TEC) of both phases. Important characteristics for cathode application as electronic conductivity and chemical compatibility with Ce0.9Gd0.1O2δ (CGO) electrolyte were evaluated. LSFCupresent edap-type conductor behavior with maximum conductivity of 135S cm1 at 275 1C and showed a good stability with CGO electrolyte at high temperatures. This work confirmed that as prepared LSFCu has excellent microstructural characteristics and an electrical conductivity between 100 and 60S cm1in the500?700 1C range which is sufficiently high to work as intermediate temperature Solid Oxide Fuel Cells (IT-SOFCs) cathode. However a change in the thermal expansion coefficient consistent with a small oxygen loss process may affect the electrode-electrolyte interface during fabrication and operation of a SOFC.