The Development of Surface-Modified La_(0.2)Sr_(0.7)TiO3 as Anode Current Collector for IT-SOFC

摘要

This study deals with the use of the A-site deficient La_xSr_(1-3x/2)TiO3 (LST_(A-)) perovskite in relation to its potential use as IT-SOFC anode or anode current collector material. The role of the preparation procedure and controlled porosity introduction is investigated related to the crystalline structure and electrical properties of the material. Cells comprising 150 microns thick YSZ screen printed with controlled porosity pre-reduced LST, impregnated with Gd-CeO2 and Cu and La_(0.6)Sr_(0.4)CoO3 as thin film cathode were produced. A single cell polarisation resistance of 0.55 Ω cm~2 was obtained using this modified material as anode at 600°C after 12 hours in fuel cell conditions, the cell maximum power density being 0.146 W/cm~2 at 600°C, using humidified hydrogen as fuel and oxygen as oxidant. Based on these results a redox stable, surface modified (support) anode can be developed for IT-SOFC.^