腐植酸/石墨烯复合材料的制备及其电化学性能

Preparation and electrochemical performance of humic acid/graphene composites

采用从褐煤中提取的腐植酸和天然石墨制得的氧化石墨烯为原料,通过水合肼加热还原法合成腐植酸/石墨烯复合材料。利用XRD、Raman、SEM和电化学测试对复合材料的形貌、微观结构和电化学性能进行表征。结果表明腐植酸均匀分散在石墨烯片层间形成夹心多孔骨架结构,可缩短电解质传播和运输路径。复合材料HRGO-0.1在电流密度为50 mA/g时表现出高的比电容(185 F/g),低的电阻率,良好的电容倍率。

The humic acid/graphene composite material was produced by heating reduction method with hydrazine hydrate using humic acid extracted from lignite and graphene oxide prepared from natural graphite. The morphology and microstructure of the composites were characterized by X-ray diffraction (XRD),Raman spectroscopy (Raman),scanning electron microscopy (SEM) and electrochemical tests. The results show that the humic acid was uniformly dispersed in the graphene sheet to form a sandwich porous framework structure,which could shorten the path of electrolyte propagation and transportation. When the current density was 50 mA/g,the composite material HRGO-0.1 exhibited high specific capacitance (185 F/g) as an electrode material with low resistivity and a good capacitance ratio.