两步法制备多孔石墨烯的电化学性能

Electrochemical performance of porous graphene prepared by two-step method

通过两步法,以氧化石墨烯(GO)为前驱体,先采用抗坏血酸(VC)、KMn O4和Na2CO3为还原剂,水热反应还原氧化石墨烯,再分别利用化学刻蚀法和硝酸超声波法,制备多孔石墨烯。通过XRD、SEM、傅里叶转换红外光谱(FT-IR)、拉曼光谱(Raman)和热重(TG)等测试分析材料的表面微观结构和还原程度;采用循环伏安(CV)、恒流充放电及电化学阻抗谱(EIS)测试材料的电化学性能。以VC为还原剂,制得还原程度较好且孔结构明显的石墨烯,用硝酸超声波处理后的石墨烯孔径小而且均匀,以1 A/g的电流在0~0.56 V循环,电极材料的比电容为87.50 F/g。

Porous graphene was prepared with graphene oxide as the precursor by the two step method, first of all, the reduced graphene oxide was synthesized by hydrotherrnal reaction with Vitamin C, KMnO4, Na2CO3 as reducing agents. Porous graphene was prepared by chemical etching and nitric acid ultrasonic processing, respectively. The surface microstructures and reduction degree of the material were characterized by XRD, SEM, Fourier transform infrared spectroscopy （ FT-IR）, Raman spectrum and thermal gravimetry（TG）. The electrochemical performance of porous graphene was tested by cyclic voltammetry （CV）, galvanostatic chargedischarge and electrochemical impedance spectroscopy（EIS）. The graphene with high degree of reduction and obvious pore structure was obtained with VC as reducing agent. The graphene pore size was small and uniform after ultrasonic treatment with nitric acid, when the current was 1 A/g, the specific capacitance of the electrode materials was 87.50 F/g in 0 - 0. 56 V.