Plasma-Sprayed YSZ/Ni-LSGM-LSCo Intermediate-Temperature Solid Oxide Fuel Cells

摘要

An intermediate-temperature solid oxide fuel cell based on YSZ/Ni anode, LSGM electrolyte, and lanthanum strontium cobaltite (LSCo) cathode coatings were sequentially deposited onto a porous Ni substrate by atmospheric plasma spraying (APS). The spray parameters for each coating are well selected. The sprayed YSZ/Ni anode having a novel nanostructure with advantageous triple phase boundaries after hydrogen reduction shows a good electrocatalytic activity for hydrogen oxidation reactions. Dense LSGM with a thickness of about 60 μm and a conductivity of about 0.053 S/cm at 800℃shows a good gas tightness and gives an open circuit voltage value > 1 V. The sprayed LSCo cathode with a thickness of 10-20 μm and a porosity of about 25% keeps the right phase structure and good porous network microstructure for conducting electrons and negative oxygen ions after plasma spraying and heat treatment at about 1000℃for 1 h. A maximum output power density of the sprayed cell achieved 365 mW/cm~2 at 800℃V250 mW/cm~2 at 750℃, and 180 mW/cm~2 at 700℃. The results show that the use of APS cell allowed the reduction of the operating temperature to below 750℃.