采用凝胶注模工艺制备固体氧化物燃料电池(SOFC)阳极材料NiO/YSZ是目前的研究热点之一.本文主要研究了凝胶注模工艺中引发剂和催化剂的加入量对凝胶固化时间的影响,干燥温度对坯体失重的影响,固相含量、造孔剂的种类及用量对瓷体收缩率的影响,并对还原后瓷体的电性能进行了表征.采用SEM、EDS方法分析表征样品.实验结果表明:在实验选定的100 mL浆料中,浓度为5wt%引发剂的加入量为2.0 mL,浓度为0.5vol%催化剂的加入体积量为1.0 mL,凝胶时间可以控制在20 min以内.NiO/YSZ阳极材料最佳干燥温度是25 ℃,固相含量为45vol%、采用15wt%石墨作为造孔剂,在1350 ℃烧成的NiO/YSZ阳极与固体电解质YSZ收缩率相匹配,氢气还原后NiO/YSZ阳极在600～800 ℃电导率达到800 S/cm,符合SOFC阳极材料电导率的要求.
The NiO/YSZ anode materials made by gel-casting process is one of the hot-spot in the areas of solid oxide fuel cell (SOFC). The effects of initiator and catalyst related to gelation time, temperature to weight loss of green, solid loading percent, type and amount of pore former to the shrinkage of samples and the conductivity of reduced anode were investigated in this paper. The samples were characterized by SEM and EDS. The results show that with 5wt% initiator 2.0 mL and 0.5vol% catalyst 1.0 mL in the 100 mL slurry, the gel time of samples could be controlled within 20 minutes. The best suitable drying temperature of green is 25 ℃. The 45vol% solid loading percent, 15wt% graphite as a pore former, sintering at 1350 ℃, the shrinkage of anode green is matched to that of YSZ. The conductivity of Ni/YSZ anode reduced is 800 S/cm at 600-800 ℃, which could meet the requirement of the conductivity as anode in SOFC.
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