Fe_(3)O_(4)/石墨烯的制备及其电化学性能研究

Preparation and electrochemical properties of Fe_(3)O_(4)/graphene

以六水氯化铁和氧化石墨烯为原料,通过水解法制备Fe_(3)O_(4)/石墨烯复合材料。用X射线衍射光谱法(XRD)、热重分析法(TG)和扫描电子显微镜法(SEM)等进行形貌和结构分析;用交流阻抗谱、恒流充放电等进行电化学性能测试。在20°~28°可以看到石墨烯微弱的衍射包,意味着石墨烯与Fe_(3)O_(4)成功复合;随着石墨烯掺杂量的增加,在石墨烯表面的Fe_(3)O_(4)颗粒逐渐减少,这是由于石墨烯含量增加时,石墨烯片发生了堆叠;当氧化石墨烯掺杂量为500 mg时,所制备的材料组装的超级电容器具有相对最大的比电容,为252 F/g,以1 A/g的电流循环2000次后,电容保持率高达92.3%,并且其也表现出了相对较小的内阻。

With ferric chloride hexahydrate and graphene oxide as raw materials,Fe_(3)O_(4)/graphene composite materials were prepared by hydrolysis method.XRD,TG and SEM were used for morphology and structure analysis.The electrochemical performance was tested by AC impedance spectroscopy,constant current charge and discharge,etc.The weak diffraction packet of graphene can be seen at 20°-28°,which means that the graphene and Fe_(3)O_(4) are successfully combined;as the doping amount of graphene increases,the Fe_(3)O_(4) particles on the surface of the graphene gradually decrease,which is due to the stacking of the graphene sheets when the graphene content increases;when the doping amount of the graphene oxide is 500 mg,the supercapacitor assembled by the prepared material has the relatively maximum specific capacitance of 252 F/g,the capacitance retention is as high as 92.3%at 1 A/g after 2000 cycles,and it shows the relatively small internal resistance.