天然气中温SOFCs阳极材料钴掺杂氧化铈的制备与性能研究

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Ce_1-xCo_xO_y（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Ce_0.8Gd_0.2O_2-δ(GDC)为电解质、以La_0.8Sr_0.2Co_0.8Fe_0.2O_3-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%Ce_0.8Co_0.2O_y（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.

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

Ce1_-xCo_xO_y（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 Ce_0.8Gd_0.2O_2-δ(GDC) as electrolyte and La_0.8Sr_0.2Co_0.8Fe_0.2O_3-δ(LSCF)-Ce_0.8Gd_0.2O_2-δ(GDC) as cathode. The crystal structure, morphology and chemical stability were investigated by XRD and SEM respectively. The performances of single cells 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 50％NiO-50%Ce_0.8Co_0.2O_y（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.