NiO晶粒尺寸对SOFC阳极电化学性能的影响

用溶胶凝胶法合成了具有高比表面积的纳米粒子NiO,用固相合成法制备了NiO-YSZ复合材料.阻抗谱测试表明,含纳米尺寸NiO的复合材料的极化电阻更小,电导率更高.以质量分数为55%的NiO-YSZ为阳极材料,并将其封接成单电池.结果表明,含纳米尺寸NiO的复合阳极制成的单电池,其输出功率更高,短路电流更大.通过减小NiO晶粒尺寸,可增大阳极三相反应界面长度,并获得性能优良的阳极材料.

Influence of Size of NiO on the Electrochemical Properties for SOFC Anodes

Nanometric NiO with a high specific surface area was synthesized by sol gel method. NiO YSZ anode materials were prepared by solid state reaction and their impedance spctra were measured. The analysis results show that NiO YSZ anode materials with nanometric oxide NiO have a smaller polarization resistance R p, higher conductivity than those with original powder NiO. The single cell with the anode of nanometric NiO YSZ in 55% mass fraction has a higher power density and higher current density than that of the cell with the anode of original power NiO YSZ in the same mass fraction. These demonstrate that the optimization of the anode can be obtained by increasing the three phase boundary(TPB) line among Nickel, YSZ and Hydrogen, which can be achieved by decreasing the size of the NiO.