Formation Of Tunable Three-dimensional Networks Of Graphene Hydrogel And Their Application In Super Capacitors

Graphene, a novel sp2 carbon material with a two-dimensional(2D) nanostructure, has attracted increasing attention, owing to its excellent chemical and physical properties result from its unique 2D structure [1-3]. The applications of graphene-based materials often require the reassembly of 2D graphene sheets into 3D architectures since 3D network of graphene e xhibits the superiorities of extremely low density, large open pores and high internal surface area which confer it tremendous potential applications in fields such as sensor, biology, engineering and environmental protection. During the last few years, much effort has been devoted to develop strategies for preparations and potential applications of 3D graphene hygrogel. Three-dimensional(3D) network of graphene hydrogel(GDH) was obtained by organic synthesis, using 1,8-Diaminooctane(OMDA) as linker. Structure tunable 3D graphene network, i.e. close-cell structure(GDH-1) and open-pore structure(GDH-2) were achieved via different connection paths between covalent bonds which resulting high specific capacitance and good rate capability(open-cell 132 F g-1 close-cell 167 F g-1). Synthesize porous graphene foams application in supercapacitors via general emulsion soft-template method, multiple micro-emulsions and micelles were employed to produce three-dimensional porous graphenes with well-tailored inter architectures for the first time. Detailed mechanism study reveals that specific interfacial interactions, such as π-π interaction, hydrophobic affinity or electrostatic interaction, are vital for the formations of porous graphene materials. When applied as cathode materials in supercapacitors, the porous graphene foams exhibited a good catalytic activity.We employ a efficient and wide range of application methods to enhance the thermal efficiency of ceramic by spray deposition of silane-modified nano-grapehne(f-CCG) on these substrate. The silane-modified nano-grapehne was prepared by mixing GO dispersion with excess amount of APTES. By spray deposition on preheated substrate and the sprayed substrate reduced in 900℃. Because of the chemical bonding between graphene and substrate, graphene and substrate closely co-ordinated. The thermal efficiency of CCG sprayed substate increase 3~4 times as long as pre-spraying.