Impact of Sintering Mechanism Evolution on Electrochemical Performance of Cathode Support Tubular Solid Oxide Fuel Cells

摘要

Cathode-supported tubular solid oxide fuel cells (CS-T-SOFCs) are regarded as promising energy conversion devices; however, their commercialization is blocked by high manufacturing cost. We have been researching dip-coating and co-sintering techniques for fabricating CS-T-SOFCs in order to reduce e cost. In this paper, we improved the sintering process and found that the degree of co-sintering has significant effects on the microstructure of electrodes and the electrolyte. The co-sintering temperature is limited by the reaction between (La_(0.8)Sr_(0.2))_(0.95)MnO_(3+δ) (LSM95) cathode and Zr_(0.89)Sc_(0.1)Ce_(0.01)O_(2+δ) ( SSZ ) electrolyte; however, by changing the co-firing temperature of the cathode-supported electrolyte tube, the relative density of electrolyte and the connection of anode particles to CS-T-SOFC could be improved. As a result, the maximum power density of a CS-T-SOFC reached 740, 635and 489 rnWcm~(-2) at 850, 800 and 750°C, respectively, with hydrogen as fuel. The long-term stability of the improved CS-T-SOFC was also investigated.