Fe_(2)O_(3)/GR超级电容器电极材料的制备与电化学性质

Preparation and Electrochemical Properties of Fe_(2)O_(3)/GR Electrode Materials for Supercapacitors

超级电容器是一种集长循环稳定性好、充放电速度快、功率密度高、不污染环境等优点于一身的新型储能器件。将石墨烯(GR)与金属有机物框架(MOF)热转化材料Fe_(2)O_(3)相结合,利用石墨烯作为二维片材料的独特电化学性能与Fe_(2)O_(3)颗粒的特点相结合,制备了Fe_(2)O_(3)/GR电极材料。以氧化石墨烯为基底,利用含氧官能团及其表面缺陷部位的吸附作用,在表面生长超小的普鲁士蓝(PB)纳米颗粒,制备出PB/GR复合气凝胶。以PB/GR为前驱体,利用高温限域热转化的方法制备Fe_(2)O_(3)/GR纳米晶复合气凝胶。充分保留了石墨烯优异的导电性和二维片状结构,有效解决了高活性纳米Fe的团聚等问题。Fe_(2)O_(3)/GR作为超级电容器的电极材料,在10 A/g的电流密度下的比电容为184 F/g,具有良好的电化学可逆性。

As a new energy storage device,the supercapacitor has the advantages of long cycle stability,fast charging and discharging speed,high power density and no pollution to the environment.Through the combination of the unique electrochemical properties of graphene(GR)as a two-dimensional sheet material and the characteristics of Fe_(2)O_(3)particles,Fe_(2)O_(3)/GR electrode materials were prepared by combining GR with Fe_(2)O_(3)as a metal organic frame(MOF)thermal conversion material.With graphene oxide as the substrate,Prussian blue(PB)/GR composite aerogels were prepared by using the adsorption of oxygen functional groups and their surface defects to grow extra small PB nanoparticles.Fe_(2)O_(3)/GR nanocrystal composite aerogels were obtained by the high temperature limited range thermal conversion method with PB/GR as the precursor.The excellent conductivity and two-dimensional sheet structure of GR were fully retained,and the agglomeration of highly active nano Fe and other problems were effectively solved.As the electrode material of the supercapacitor,the Fe_(2)O_(3)/GR is of 184 F/g specific capacitance at a current density of 10 A/g and has good electrochemical reversibility.