The Application Of Perovskite Functional Materials In The Solar Cells And The Solid Oxide Fuel Cells

Perovskite has the formula AMX₃,it's widely used as the optical and semiconductor materials because of its special properties.The two derivatives of cubic perovskites are the organic-inorganic hybrid perovskites and the metal ceramic oxides.The former materials were used in perovskite solar cells for the A site organic cations which made the material self-assembly and good optical performance.Meanwhile the M site metal cations provided the thermal stabilities?mechanical strength and high mobilities;the latter one was always used as the anode materials of SOFC because its stabilities in high temperature and it was easy to form defects when doping it.In this paper,two lead-free perovskite materials synthsised—were MAPd Cl₃and MAMn I₃.With the characterization of them,it had been proved both materials had good thermal stabilities and optical performance.In addition,the transition in the unit cells was studied when MAPb I₃humidified in the wet atmosphere(90%RH).It had been proved that the Pb I₂came out as soon as the material humidified,and with the humidifying,crystalline hydrates also came out.This kind of hydrates may disappear when the material was dried in the oven.The trend of the humidified MAPb I₃to be noodlelike could be associated with the crystalline hydrates.Anodic performance and power generating properties of the cells using Ni-free oxide La_0.5Sr_0.5Fe_0.8Cu_0.1Ti_0.1O_3-?(LSFCT)were investigated by using 8%yttria-stabilized Zr O₂electrolyte and Pr_0.5Sr_0.5Fe_0.8Cu_0.2O_3-?cathode.It was found that reasonably high power densities were achieved on the cells with various fuels.The maximum power density(MPD)of the cell with wet H₂as fuel is 690,531 and 368mWcm^-2at 800,750 and700°C,respectively,and the MPDs of the cells with wet H₂containing54ppm H₂S and wet syngas(H₂+50%CO)as fuels is 618 and 512 mWcm^-2at 800°C,respectively.Moreover,the cell with wet H₂fuel demonstrated a reasonable stability at 800 ^oC under 0.7 V for 110 h.This work also presented that doping Ti slowed down the structure transformation of LSFCT to its reduced form under reducing atmosphere,decreased the thermal expansion coefficient and suppressed segregation of Sr at the surface of LSFCT,which may account for the improved cell stability comparing with the undoped La_0.5Sr_0.5Fe_0.8Cu_0.2O_3-?anode.