纳米钙钛矿La1-xSrxMnO3的制备及石墨烯改性

Preparation And Graphene Modification of Nano Perovskite La1-xSrxMnO3

摘要:

以硝酸镧、硝酸锶、硝酸锰为原料，采用超声波辅助溶胶-凝胶法制备纳米钙钛矿La1-xSrxMnO3，并与石墨烯进行掺杂改性。利用XRD、SEM-EDS和DLS对La1-xSrxMnO3及石墨烯/La1-xSrxMnO3复合材料进行结构表征，考察了煅烧温度、pH值对La1-xSrxMnO3晶型、尺寸的影响，并测试了石墨烯改性对复合材料性能的影响。结果表明：超声波辅助条件下，650℃、pH=10时制备的La1-xSrxMnO3分散性良好、粒径均匀,平均粒径为210nm。XRD结果表明：石墨烯掺杂未改变La1-xSrxMnO3晶相。首次充放电实验结果表明：与改性前相比，石墨烯掺杂改性后复合材料作为催化剂的锂空气电池首次放电容量从4300mAh/g升高至7900mAh/g。

Abstract:

The perovskite La1-xSrxMnO3 was prepared by sol-gel method under ultrasonic assistant with lanthanum nitrate, strontium nitrate and manganese nitrate as raw materials and doped with grapheme. The La1-xSrxMnO3 and Graphene/La1-xSrxMnO3 composites were characterized by XRD, SEM-EDS, DLS. The effects of calcination temperature and pH on the crystal structure were investigated. We also have investigated the effect of graphene modification on properties of materials. The results show that the La1-xSrxMnO3 prepared by the sol-gel method under ultrasonic assistant have good dispersibility, uniform particle size about 210nm. XRD analysis that Graphene doping does not change the La1-xSrxMnO3 metallography. The first charge and discharge results show that: Compared with pre-modification, the discharge capacity of the Li-air battery with the composite modified by graphene as catalyst was improved to 7900mAh/g from 4300mAh/g.