一种多孔石墨烯的制备方法

Preparation method of porous graphene

Abstract

本发明一种多孔石墨烯的制备方法,包括以下步骤:⑴将氧化石墨在pH9-10的水/乙醇混合溶液中剥离后,与化学发泡剂混合均匀,经过滤干燥得到固体混合物;⑵将所述混合物置于还原气氛围中,加热膨胀还原制得膨化石墨烯;⑶将膨化石墨烯与强碱共混,高温活化;⑷经盐酸和去离子水洗涤、干燥得到多孔石墨烯;用本发明的方法制备的多孔石墨烯比表面积能达到2075m2/g,孔容能达到1.8cm3/g,平均孔径在1~7nm;作为超级电容器电极材料在1Ag-1电流密度下比电容能达到155F/g,作为多孔石墨烯电极随着电流密度从0.2Ag-1增大到20Ag-1比电容保持率能达到84.4%;有较高的比电容和循环稳定性;本发明的制备方法工艺简单、成本较低、易于规模化生产。
The invention discloses a preparation method of porous graphene. The method comprises the steps of: (1) stripping graphite oxide in a water/ethanol mixed solution with pH of 9-10, adding a chemical foaming agent and mixing them uniformly, carrying out filtering and drying to obtain a solid mixture; (2) placing the mixture in a reducing atmosphere, and performing heating expansion reduction to obtain expanded graphene; (3) blending the expanded graphene with strong base, and conducting high temperature activation; and (4) washing the product with hydrochloric acid and deionized water, and performing drying so as to obtain porous grapheme. The porous graphene prepared by the method involved in the invention has a specific surface area up to 2075m<2>/g, a pore volume up to 1.8cm<3>/g, and an average pore size of 1-7nm. As a supercapacitor electrode material, the specific capacitance can reach 155F/g under a current density of 1Ag<-1>. As a porous graphene electrode, the specific capacitance can reach 84.4% along with the increase of current density from 0.2Ag<-1> to 20Ag<-1>. The porous graphene has high specific capacitance and cycle stability. The preparation method disclosed in the invention has the advantages of simple process, low cost, and easy scale production.

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