Preparation Of Novel Carbon Materials And Their Application In Electrochemical Field

Carbon materials, due to their high electrical conductivity and great stability, have been widely used as electrode materials and electrocatalysts.With the emergence of new carbon nanomaterials,their specific surface areas and electrical properties such as electrocatalytic acivities have been significantly improved.In this paper, two graphite materials (graphite nanosheet and graphene) were composite with polymers.The composites were applied in the fields of electrocatalysis and supercapacitors.The contents of the thesis are given as follows:1.Graphite nanosheet (GNS) and Nafion were mixed, and modified on glassy carbon(GC) electrode to fabricate the GNS-Nafion/GCE. Electrochemical study found that the GNS-Nafion/GCE displayed excellent electrocatalytic activity towards dopamine (DA) and ascorbic acid (AA).The GNS-Nafion/GCE could effectively distinguish the anodic peak of AA and DA.In the presence of high concentration of AA, the GNS-Nafion/GCE has a high sensitivity for detection of DA without interference. The proposed electrode has been applied for detecting DA in real samples and satisfactory results were obtained.2.Graphene (G) was prepared material by chemical reduction method and characterized.Multilayer composite films of G and polyaniline (PANI) were fabricated via layer-by-layer self-assembly technique on conductive substrates. In situ UV-vis and quartz crystal microbalance tests showed that PANI/G films increased uniformly with growth layers. Their electrochemical capacitance performances, which were tested as an electrode material of supercapacitors, were evaluated by the cyclic voltammetry and galvanostatic chang/discharge tests in 0.1 M H2SO4. Duing to its high specific capacitance, PANI/G multilayer composite films are potential in the field of thin film micro-power.