沉淀法合成NiO及NiO-YSZ阳极性能

Performance of NiO-YSZ anode with NiO powder synthesized by precipitation method

用硝酸盐-氨水沉淀法合成了NiO纳米粉体,X-射线粉末衍射结果表明样品为面心立方结构,颗粒的平均粒径为23nm。以此纳米NiO为原料,制备NiO-YSZ阳极,阳极的高温烧结收缩比YSZ电解质小6%。高温H2还原电阻测量表明该阳极在700℃时10min完成还原,电导率为570S/cm。在NiO-YSZ阳极上用离心沉积方法制备了一层厚12μmYSZ薄膜,扫描电子显微镜测试结果表明阳极和电解质薄膜之间的接触良好。采用Sm0.2Ce0.8O1.9浸渍的La0.7Sr0.3MnO3阴极,单电池在750℃时的最大比功率为0.52W/cm2,测试结果还表明该阳极具有合理的孔隙率:说明采用硝酸盐-氨水沉淀法合成的NiO可以应用于制备固体氧化物燃料电池的阳极。

NiO nano-powder was synthesized by a nitrate-ammonia precipitation method. The XRD pattern showed that it was a face-centered cube and the average particle size was 23 nm.The nano-NiO-YSZ anode was subsequently prepared, and the sintering shrinkage of the anode （13.6%） was 6% lower than that of the YSZ electrolyte. Hydrogen reduce resistance at high temperature measurement showed that the anode can be reduced at 700℃ in 10 min, with a conductivity of 570 S/cm. A YSZ film of about 12 μ m thick was deposited on the anode by centrifugal casting,and SEM result showed that the film was well adhered to the anode.With Sm0.2Ce0.8O1.9 impregnated La0.7Sr0.3MnO3 cathodes, the cell produced a maximum power density of 0.52 W/cm^2 at 750℃. The cell performance showed that the anode had reasonable porosity, indicating that NiO synthesized by the nitrate-ammonia precipitation method can be applied in the anode preparation of SOFC.