Study On The Key Materials Of Solid Oxide Fuel Cell

Solid oxide fuel cell (SOFC) has attracted much attention because of itsenvironmental friendship and high efficient in energy conversion, and has beenregarded as the green power source in the21st century. In recent years, the requirements to reduce costs for high-temperature SOFC technology challenges and market-oriented, the pursuit of the temperature of the SOFC research and development trends of key materials, higher demands. Our laboratory is one of the few units who takes the leading in both Solid Protonic Fuel Cell and new ceramic interconnect materials, also we have made great progressIn this paper, BaZro.7Pr0.1Y0.2O3-δ(BZPY) and BaZro.TPr0.1Y0.16Zn0.04O3-δ (BZPYZn) proton-conducting and Smo.2Ceo.gO1.9(SDC) Oxygen ion-conducting solid oxide fuel cells (SOFC) electrolytes,(Pr0.5Nd0.5)0.7Cao.3Cr1-xCuxO3-δ(PNCCCx, x=0,0.02,0.04,0.05,0.06,0.1,0.15,0.2),and Yo.7Cao.3Cro.9Mo.1O3-δ(YCCM, M=Fe、 Co、Ni、Cu、Zn) interconnect material were synthesized by a citrate-nitrate combustion method. The phase and microstructure of the sintering samples were investigated by X-ray diffraction and scanning electron microscope, respectively. The electrical conductivity of the samples were measured by four-probe technique.The results showed that BZPYZn presented a single perovskite structure after calcinations at1100℃for5h. With increasing of sintering temperatures (1300℃to1400℃), the grain size of BZPYZn ceramic sample increases, and porosity decreases. The BZPYZn sample exhibit high ionic conductivity (10-3to10-2S/cm) at500-800℃. The average TEC of the BZPYZn is9.2×10-6/K1from room temperature up to1000℃, which fits well with those of electrode materials (Ni e.g.). Preliminary results indicate that BZPYZn is a promising candidate as stable and easily sintered electrolyte for intermediate-temperature SOFC.The results indicated that there is no new-phase were detected after co-firing between Cu-doping PNCC and SDC at1350℃for5h. In air or H2atmosphere, the conductivity of the sintering ceramics increasing with temperature, as well as the Cu-doped contents,.At800℃, the conductivity for PNCCC0.06reached69.34S/cm in air and25.38S/cm in H2, respectivity, which is higher obviously than that of the sample for x=0(13.66S/cm in air,12.36S/cm in H2). The average thermal expansion coefficient of the sample close to other material at the RT-1000℃. Our results indicate that the PNCCC compounds is a very promising interconnect material for intermediate solid oxide fuel cellsThe thermoelectric properties by improve the YCCM of series-connecting material increase to improve the the800℃YCCNi achieve a conductivity of of the highest23.25S/cm, using the screen printing method to the anode NiO+YSZ, and NiO+YSZ+YCCNi composite anode as a supportthe body was successfully prepared YCCM,(M=Fe, Co, Ni, Cu, Zn) series-connecting material film.