改进的阶梯电压方法研究LSM-YSZ阴极的极化活化

Study of LSM-YSZ cathode activation with modified potential stair step method

改进的阶梯电压测试方法用来测试用LSM-YSZ作为阴极的NiO-YSZ阳极支撑SOFC的性能,从电池开路电压开始测试,电压台阶为0.1 V,在每一个电压台阶保持的时间为30 min,在OCV-1V结束测试。对每一个电压台阶的电流密度和功率密度曲线进行线性拟合,拟合曲线的斜率表示了在此电位下电流通过电池时对电池的活化作用。选择电池在OCV-0.7 V恒压条件活化电池,通过10 h活化后,电池在700℃的最大功率密度由活化前的184 mW/cm2提高到326 mV/cm2。

Modified potential stair step method is used to measure the performance of NiO-YSZ anode supported SOFC with LSM-YSZ cathode. Measurement starts from open circuit voltage at 0.1 V potential step, keeps at each step with for 30 mins, and ends at OCV-1V. Slopes of fitted line for current density and power density are considered as the activation index of cell performance. The cell is activated under optimized activation condition, at OCV-0.7 V for 10 hours. After the activation, the maximum power density of the cell increases from 184 mW/cm^2 to 326 mW/cm^2 at 700 ℃ with 97% H2＋3%H2O fueled.