Study On The Preparation Of Graphitic Carbon Materials For Electrochemical Energy Storage

The aim of this research is to explore the use of cheap raw materials and novelsynthetic methods for preparing graphitic mesoporous carbon, which are used as theelectrode materials of super-capacitors. Various characterization methods areemployed to analyze their morphology, structure and performance. The majorcontents can be summarized as follows:(1) Graphitic mesoporous carbon materials are synthesized by using Ni-Fe(Ni/Fe=2) layered double hydroxide (LDH) and the layered double oxide (LDO) astemplate, followed by carbonize under a relatively low pyrolysis temperature and theremoval of impurities by HCl. After the structure characterization, the synthesismechanism is discussed. The results show that the GC-LDH possesses a highergraphitization degree than GC-LDO, which may be caused by the nanoscale catalysisperformance of LDH. Meanwhile, these graphitic carbons exhibit mesoporousstructure.(2) A graphitic ordered mesoporous carbon (G-OMC) has been synthesized forthe first time using mesoporous nickel oxide as a template and catalyst and dopamineas a carbon source. The probable formation mechanism for the preparation of G-OMCis also proposed. Characterization by X-ray diffraction, Raman spectroscopy and highresolution transmission electron microscopy indicate that the as-prepared mesoporouscarbon has a high degree of graphitization. The supercapacitor application of thecarbon material is also researched. The electrochemical performance of G-OMC isvisibly superior to typical CMK-3D in alkalic media, involving fast kinetic transfer,anti-corrosion, a capacitance of68μF/cm~2at0.1A/g. The results demonstrate thatgraphitic ordered mesoporous carbon have good electrochemical performances.(3) Metal-organic frameworks are conducted to synthesize graphiticmesoporous carbon materials. Graphitic mesoporous carbon materials are synthesizedby using terephthalic acid (PTA) as precursor. The resulting graphitic carbon showshigh crystallinity, large surface area (up to894cm~2/g) and pore volume (up to0.78cm~3/g). The electrochemical measurements indicate that the specific capacitance of G-carbon is as high as127F/g at5mV/s. Meanwhile, graphitic mesoporous carbonmaterials are obtained by PVP as carbon resources, which show uniform morphology.