Xiangwei Meng

BaCo0.7Fe0.2Nb0.1O3 − δ Perovskite Oxide as Cathode Material for Intermediate-Temperature Solid Oxide Fuel Cells

The cathode material BaCo 0.7 Fe 0.2 Nb 0.1 O 3-δ (BCFN) was prepared by the solid-state reaction for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The samples had a cubic perovskite structure. The electrical conductivity was relatively low with a maximum value of 13.89 S cm -1 at about 800°C. The area specific resistance value for the BCFN cathode was as low as 0.014 Ω cm 2 at 800°C. Using BCFN as the cathode, the Ce 0.9 Gd 0.1 O 1.95 electrolyte-supported single cell exhibited peak power intensities of 618 mW cm -2 at 800°C. Preliminary results demonstrated that BCFN is a very promising cathode material for application in IT-SOFCs.

Layered perovskite GdBa0·5Sr0·5CoCuO5+δ as cathode material for intermediate-temperature solid oxide fuel cells

Abstract Layered GdBa0·5Sr0·5CoCuO5+δ(GBSCCu) perovskite oxide is synthesised using an ethylenediaminetetraacetic acid (EDTA)–citrate combined method. Electrochemical performances are investigated as a novel cathode material for intermediate-temperature solid oxide fuel cells. The cathode GBSCCu chemical compatibility with Gd0·1Ce0·9O1·95 (GDC) electrolyte is examined below 950°C. The electrical conductivity value of the GBSCCu sample reaches a maximum of 147 Scm−1 at 750°C in air. The thermal expansion coefficient of the GBSCCu sample is 16·9×10−6 K−1 between 30°C and 900°C. The polarisation resistance of GBSCCu on the GDC electrolyte is 0·102 Ω cm2 at 800°C. The maximum power density of a single cell with a GBSCCu–GDC composite cathode on the 300 μm thick GDC electrolyte reaches 402 mW cm−2. These results indicate that GBSCCu is a potential cathode material for GDC electrolyte intermediate-temperaturte solid oxide fuel cells(IT-SOFCs).