钙钛矿型La1-xCaxCoO3纳米孔材料在Al-H2O2半燃料电池中的应用

摘要

Perovskite-type series of compounds La1-xCaxCoO3 (x=0.2,0.4,0.5) were synthesized by a modified amorphous citrate precursor method.Their catalytic activities for hydrogen peroxide electroreduction in 3.0 mol· dm-3 KOH at room temperature were evaluated by cyclic voltammetry and galvanostatic measurements.The influences of annealing temperature and the molar ratio of La to Ca of La1-xCaxCoO3 on catalytic performance were investigated.Among the series of compounds,La0.6Ca0.4CoO3calcined at 650 ℃ exhibited the highest catalytic activity.An aluminum-hydrogen peroxide semi fuel cell using La0.6Ca0.4CoO3 as cathode catalyst achieved a peak power density of 201 mW· cm-2 at 150 mA·cm-2and 1.34 V running in 0.4 mol·dm-3 H2O2.%通过改进的无定形柠檬酸前驱体法制备钙钛矿型La1-xCaxCoO3(x=0.2,0.4,0.5)系列化合物.使用循环伏安法和恒电流测试La1-CaCoO3系列化合物对于过氧化氢的电催化还原性能.同时也检测了La1-xCaxCoO3化合物中La与Ca的摩尔比及煅烧温度对其催化性能的影响.在La1-xCaxCoO3系列化合物中,650℃煅烧的La0.6Ca0.4CoO3展现出最佳的催化活性.在含有0.4 mol·dm-3 H2O2的3.0 mol·dm-3 KOH水溶液中,使用这种材料作为铝-H2O2半燃料电池的阴极催化剂,在150 mA· cm-2电流密度下该电池的电压为1.34 V,能量密度为201 mW·cm-2.