Preparation Of Porous Carbon Nanosheets

Porous carbon nanosheets, as a novel porous material, possess a unique two-dimensional morphology with nanoscale. Its high exposure rate of external surface, shallow channel and shorten path of mass transfer make it outstanding in fields of catalysis, energy storage, etc. This work aims at creating micropore structure in carbon nanosheets. In this study, Zn2+was induced into the carbon precursor via coordination. The transformation process from coordinated Zn2+to ZnO, and then to metallic Zn was supposed to etch carbon atoms to create pore structure, and the volatilization of Zn further create pore channels. The content of this thesis is listed below:1) Basing on the study of synthesis of graphene oxide from this group, Zn2+is introduced to complex with oxygen-containing functional groups on the surface of graphene oxides, and then it created micropore structure in the process of pyrolysis. The results show that the produced nanosheets remained its original morphology, and the surface area increased from62m2g-1to111m2g-1, compared with the one without introduction of Zn2+, which demonstrated that the Zn effectively created pore structure in the pyrolysis process.2) Basing on the study of synthesis of polymer-based carbon nanosheets from the group, Zn2+was introduced into the precursor of carbon nanosheets with the aid of solvent swelling effect, in this case tetrahydrofuran, for the facilitation of Zn2+diffusion. The results show that the carbon nanosheets have a specific surface area of976m2g-1which is remarkably higher than670m2g-1of the one prepared without using Zn2+. This demonstrated that the introduction of Zn can effectively create porosity of carbon nanosheets.