天然气中温SOFCs阳极材料钴掺杂氧化铈的制备与性能研究

Preparation and Properties of Cobalt-Doped Ceria(CDC) for IT-SOFCs Anodes in Natural Gas

采用溶胶-凝胶法合成了新型中温固体氧化物燃料电池（IT-SOFCs）阳极材料Ce1-xCoxOy（x=0.10,0.15,0.20,0.25,0.30）（CDC）,并采用共压-共烧结法制备了以NiO-CDC复合阳极为支撑、以Ce0.8Gd0.2O2-δ（GDC）为电解质、以La0.8Sr0.2Co0.8Fe0.2O3-δ（LSCF）-GDC为复合阴极的单电池.利用XRD和SEM等方法对阳极材料进行了晶相结构、微观形貌和化学相容性等分析.在400~700℃范围内,以加湿天然气（3%H2O）为燃料气,氧气为氧化气测试了电池的电化学性能.结果表明：CDC阳极材料具有良好的孔道结构;八种不同阳极组成的单电池中50wt%NiO-50wt%Ce0.8Co0.2Oy（C20C80）阳极支撑的单电池具有最佳的电化学性能,在650℃时其最大电流密度为148.84mA/cm2,最大比功率为30.91mW/cm2.

Ce1-xCoxOy（x =0.10, 0. 15, 0.20, 0. 25, 0. 30）（CDC） powders as the anode materials of intermediate temperature solid oxide fuel cells （IT-SOFCs） were prepared by sol-gel method. The NiO-CDC anode-supported cells were fabricated by dry-pressing process using Ce0.8 Gd0.2O2-δ （GDC） as electrolyte and La0.8Sr0.2Co0.8Fe0.2O3-δ（LSCF）-GDC as cathode. The crystal structure, morphology and chemical stability were investigated by XRD and SEM respectively. The performances of single ceils were tested by using humidified natural gas （3% H2O ） as fuel and oxygen as oxidant in the temperature range from 400℃ to 700℃;. The results show that the anode of the cell has good open-framework; The 50wt%NiO-50wt%Ce0.8Co0.2Oy（C20C80）anode-supported cell shows the best electrochemical performance among the eight cells composed of different anodes. The maximum current density and power density are 148.84mA/cm2 and 30.91mW/cm2 tested at 650℃ , respectively.