Preparation Of Functionalized Graphene Nanomaterials And Their Electrochemical Application

In resent years, synthesis of functionalized graphene nanomaterials with specific structure and excellent property has attracted tremendous attention in the scope of scientists. This dissertation mianly synthsized several functionalized graphene nanomaterials with graphene as a template, and study the application of these nanomaterials in electrochemistry. The main points were described as follows:(1) graphene/AuNPs nanocomposites was firstly fabricated via a one-step method using environmentally benign Hexamethylenetetramine (HMTA) as reducer. This method was more environmentally friendly compared to the other pattern. The AuNPs demonstrate remarkably good dispersion and smaller size on graphene nanosheets. therefore, The resulting grapheme/AuNPs nanocomposites modified GCE, which show high electrocatalytic activity toward both O2and H2O2, exhibited the resulting is an excellent sensing materials and have potential applications in electrochemical sensors.(2) This experiment have reported a facile synthesis of Pt/polyallylamine/reduced graphene oxide (Pt/PAA/RGO) composites,which used PAA as a linker and stabilizer and NaBH4as reducer. PAA as a linker can well bind Pt nanoparticles with RGO, and stabilize Pt nanoparticles to protect from aggregation. So the Pt nanoparticles are well distributed on the surface of RGO with an average diameter of1.4nm. It can be expected that Pt/PAA/RGO composites show a high electroactive surface area, which the as-prepared Pt/PAA/RGO exhibit a higher conversion efficiency of methanol and a faster oxidation removal of adsorbed CO during the electrochemical catalysis process. Herein, this resulting as catalysts were expected to replace the other noble metal electrode materials in methanol fuel cell.(3) Graphene/si nanocomposites as the anode materials for lithium-ion battery were obtained through chemical synthesis method while graphene was used as template. To allow access to this nancomposites in macroscopic applications, this experiment firstly designed a route with which graphite can be fully exfoliated to graphene while maintaining high electrical conductance, though the chemical liquid stripping method. This method produced graphene sheets with a high yield and a low cost were monolayers and few layers, which wrapped Si nanoparticles to form Graphene/Si nanocomposites. The coating effect is good, and there is no bare Si nanoparticles on the grapheme surface. This nanocomposites will be used as the anode material for lithium ion battery, and should have a good cell performance.