Study Of Preparation And Performance On Anode And Electrolyte Of IT-H₂S-SOFC

Six BaZro.5Ceo.5-χYχO3δ(BCZY) electrolytes and Ceo.7Sro.3Cro.5Feo.503-s (CSCF) are preparated by urea nitrate combustion method. The performances of materials are characterized using TG-DSC, SEM, XRD, DC Four Probe methods and electrochemical workstation. Then, three single proton-type H2S-SOFCS are tested, respectively BCZY0.15, BCZY0.17 and BCZY0.20as the electrolyte, La0.7Sr0.3Cr0.5Fe0.5O3-δ(LSCF) as the anode and Ag as the cathode. Finally, the sigle cell of CSCF/BCZY0.15/Ag is installed for researching the application about CSCF in H2S-SOFC.It is sure that BCZY can form typical perovskite structure sintered at 750℃by TG-DTA. And they have good size structure. Six kinds of electrolyte have good conductivity, and increase with temperature increasing under hydrogen environment. The order of the conductivity is BCZY0.13> BCZY0.10> BCZY0.15> BCZY0.00> BCZY0.17> BCZY0.20. BCZY0.13 has the best conductivity which is 3.264×10-3S·cm-1, but has poor chemical stability. The sulfur-tolerant tests show that only three electrolytes, BCZY0.15, BCZY0.17 and BCZY0.20 have good resistance to sulfur at 850℃.The anode catalyst of CSCF fired in Muffle furnace at 1000℃in air, then the required typical perovskite is obtained in 3% H2-N2 at 1300℃. The conductivities are 0.72 S-cm-1 and 1.37 S-cm-1, respectively in 3% H2-N2 and 5% H2S-N2. And there is good resistance to sulfur.Three proton-type H2S-SOFCS tests show that the single fuel cell whose electrolyte is BCZY0.15 has the better battery performance and desulfurization.H2S-SOFC performance is test, CSCF for the anode catalyst. At the test temperature range, cell performance increases with the temperature rising. At 800℃, the maximum ope circuit voltage is 0.75V, the maximum power density and current density are 7.3mW·cm-2 and 51.24 mA-cm-2 when the fuel flow rate is 70 mL-min-1. The maximum hydrogen sulfide removal is up to 72% at a fuel flow rate of 30 mL·min-1.