以硝酸镧、硝酸锶、硝酸锰为原料,采用超声波辅助溶胶-凝胶法制备了纳米钙钛矿La_(1-x)Sr_xMnO_3(x=0、0.1、0.2、0.3、0.4、0.5),并与石墨烯进行了掺杂改性。利用XRD、SEM-EDS和DLS对La_(1-x)Sr_xMnO_3及石墨烯/La_(1-x)Sr_xMnO_3复合材料进行结构表征,考察了煅烧温度、p H值对La_(1-x)Sr_xMnO_3晶型和尺寸的影响,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℃、p H=10时制备的La_(1-x)Sr_xMnO_3分散性良好、粒径均匀,平均粒径为210 nm。XRD结果表明:石墨烯掺杂未改变La_(1-x)Sr_xMnO_3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4 300 m Ah/g升高至7 900 m Ah/g。
The title compound(C12H16N2)was synthesized by the reaction of o-phenylenediamine(I)and acetone(II)which was accelerated by microwave irradiation and catalyzed by acetic acid under solvent-free condition.The optimal conditions are as follow:n(I):n(II)=1:1.2(I 1.08g,II 1.22 g),acetic acid 2 mL,time of microwave irradiation 10 min,and microwave power 320 W.The title compound was characterized by IR spectrogram and NMR spectra.The crystal structure was determined by X-ray single crystal diffraction.The title compound belongs to orthorhombic system with space group Pna2(1),Mr=189.28,a=1.22502(14),b=0.73344(8),c=1.20112(14)nm,V=1.0792(2)nm3,Z=4,Dc=1.165 g/cm3,F(000)=412,μ=0.070 mm-1,GOF =0.999,R1=0.0358,wR2 = 0.1087(I > 2σ(I)).
