Advanced Materials Of Graphene-Based Components For Supercapacitor Electrode Materials

With the advancement of science and technology, the space exploration activities have becoming more and more challenging, the working environment of air crafts ask more for their vehicle electric drive systems and power devices. Supercapacitors are the electrochemical devices that allow for the fast and reversible storing and releasing of energy. They are considered as a promising candidate for energy storage due to high power performance, long cycle life, and could be used in an limited environment of-40to60℃, etc. Graphene is a two-dimensional material with high surface area and excellent electrical conductivity, which make it an ideal single-atom thick substrate for growth of functional nanomaterials to render them electrochemically active and electrically conductive to the outside current collectors. In present works, we choose graphene oxide as substrate, to prepare GO-metal hydroxide or metal oxide two dimensional nanosheets, and evaluate their properties.(1) GO-Co(OH)2two-dimensional functional nanosheets were synthesized and been used as building block, assembled to layered materials via electrophoretic deposition method directly onto the conducting substrate (nickle foams), and obtain layered GO-Co(OH)2materials (GO-Co(OH)2-ED). Compare to traditional slurry-coating technology, EPD method not only obtained the layered structure, at the same time, it was also pretend the active materials from binder which hinder the potential application of electrode materials. These advantages gave better performances of GO-Co(OH)2-ED than GO-Co(OH)2and pure Co(OH)2. The comparison between GO-Co(OH)2and pure Co(OH)2show that the GO play an optimistic role in the performance of composite.(2) Two series of Gemini surfactants with various spacer lengths (s=2,4, and6) and chain lengths (m=8,12,16) were synthesized. Two sets of two-dimensional graphene oxide-based mesoporous silica (GOMS) were prepared by using graphene oxide as substrate, tetraetylortho silicate (TEOS) as silicon source, and using different Gemini surfactants as templates. The materials have high specific surface area, which makes them perfect templates to fabricated different kinds of functional materials which have two-dimensional structure and high specific surface area. Experiments show that GOMS were successfully prepared, and that the pore size can be affected by the spacer length as well as the chain length of Gemini surfactants. Specifically, the pore size decreases with the spacer length increase, and the pore size increase with the increase of chain length. A series of GOMS with controllable pore size within a certain range can be obtained through different kinds of Gemini surfactants, which not only can extend the option boundary of the precursors, but can also make the control of materials’ application performance, within a certain range, become possible.