La_(1-x)Sr_xMnO_3的制备及其电催化性能

The Study on Synthesis and Electrocatalytic Properties of La_(1-x)Sr_xMnO_3

为了改善空气扩散电极的电催化性能,提高锌空气电池的放电电流,采用溶胶-凝胶法制备了分子式为La1- SrxMnO3 的锌空气电池用电催化剂。通过X 射线衍射(XRD)、稳态电流-电压极化曲线等方法研究了La1- SrxMnO3 x x催化剂的结构与电催化性能,并将其作为锌空气电池催化剂装配成AA 型锌空气电池进行恒流放电测试。研究结果表明,当分子式中的x=0.3、热处理温度为700℃时,所合成催化剂La0.7Sr0.3MnO3具有最优的电催化活性;XRD 的分析证实,该催化剂的结构为完美的钙钛矿型晶体结构;分别以La0.7Sr0.3MnO3和LaMnO3为催化剂的AA 型锌空气电池的放电容量分别为4 800 mAh 和4 200 mAh,前者比后者的放电比能量有显著的提高。该催化剂的研制成功将有助于加快锌空气电池的实用化进程。

To improve catalytic activity of gas diffusion electrode and discharging current of zinc-air batteries, La1-xSrxMnO3 catalysts for zinc-air batteries were prepared by a improved sol-gel method. XRD was employed to characterize the catalyst, and catalytic activity of La1-xSrxMnO3 prepared at different temperature and with different x values were investigated by steady polarization curves. Also discharging properties of AA type zinc-air batteries were tested by a constant discharging test. The results show that the product La0.7Sr0.3MnO3 has maximal catalytic activity, when x values of La1-xSrxMnO3 is 0.3 and synthetical temperature is 700 degrees C. Also, the product La0.7Sr0.3MnO3 possesses a perfect perovskite structure. The results also show a discharging capacity of AA type zinc-air batteries with LaSrMnO3 and La0.7Sr0.3MnO3 catalyst which is 4 800 mAh and 4 200 mAh respectively. The discharging specific energy of the latter had a obvious increase than that of the former.