Study on Preparation and Properties of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-Δ-mGd_0.2Ce_0.8O₂ (M=0,30,40 and 50) Composite Cathode

Solid Oxide Fuel Cells (SOFCs) can convert chemical energy into electrical energy, with high conversion rate, safe operation, no pollutant emissions, and is one of the most potential new power generation devices in future. However, at low medium temperature (below 800℃), cathode impedance SOFCs will increase sharply, resulting adverse effects on cell performance. Finding materials that work key to realize large-scale commercial application SOFCs. LSCF material commonly used for solid oxide fuel cells because its excellent electronic ionic conductivity. performance cannot meet requirements applications. At temperature, solid-state reactions are easy occur between electrolyte such as YSZ, SSZ LSGM, formation an intermediate phase not conducive Oxygen Reduction Reaction (ORR). In this paper, Gd 0.2 Ce 0.8 O 2 (GDC) were combined by ball milling prepare composite cathode. XRD test found two powders mixed did produce substances, good compatibility. The conductivity showed decreased significantly from 227 Sꞏcm -2 650℃ 115, 90 77 550℃, respectively. a ratio 6:4 has lowest polarization impedance, only 0.10 Ωꞏcm 800℃. discharge shows mass GDC best performance, density 328 256 mW/cm 800 750℃, stability after working 50h.