La 0.6Sr 0.4Fe 0.8Cu 0.2O 3-δ perovskite oxide as cathode for IT-SOFC
Journal
International Journal of Hydrogen Energy
Journal Volume
37
Journal Issue
16
Pages
11963-11968
Date Issued
2012
Author(s)
Abstract
A La 0.6Sr 0.4Fe 0.8Cu 0.2O 3-δ (LSFCu) perovskite was investigated as a cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFC). The LSFCu material exhibited chemical compatibility with the Sm 0.2Ce 0.8O 1.9 (SDC) electrolyte up to a temperature of 1100 °C. The electrical conductivity of the sintered sample was measured as a function of temperature from 100 to 800 °C. The highest conductivity of about 238 S cm -1 was observed for LSFCu. The average thermal-expansion coefficient (TEC) of LSFCu was 14.6 × 10 -6 K -1, close to that of typical CeO 2 electrolyte material. The investigation of electrical properties indicated that the LSFCu cathode had lower interfacial polarization resistance of 0.070 Ω cm 2 at 800 °C and 0.138 Ω cm 2 at 750 °C in air. An electrolyte-supported single cell with 300 μm thick SDC electrolyte and LSFCu as cathode shows peak power densities of 530 mW cm -2 at 800 °C. ©, 2012 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
SDGs
Type
journal article