Preparation And Performance Study Of High-performance Graphene Paper And Microtubes

As a two-dimensional material with excellent properties,graphene has great application prospects in the fields of energy storage,sensing and catalysis.One way to achieve widespread application of graphene is to assemble graphene nanosheets into macroscopic graphene materials by using an efficient assembly method,such as graphene fibers,graphene film/paper,and threedimensional graphene frameworks.High-performance materials must have broader application prospects.The fabrication of high-performance macroscopic graphene materials can be obtained by improving preparation methods.Therefore,the purpose of this paper is to improve the preparation methods of existing macroscopic graphene materials,and it includes following two jobs:Among the graphene assembly materials,graphene films/papers are the most widely studied.In order to prepare high-performance graphene paper,the conventional electrostatic spray method to prepare graphene paper is improved.The fixed substrate is replaced by a movable control collection substrate,and the graphene paper with vertically aligned graphene sheets is obtained.Through the test of the conductivity of graphene paper,it is proved that the improvement of the aligned degree of graphene sheets can effectively enhance the electrical conductivity of graphene paper.At the same time,in order to test graphene papers electrochemical performance,it was assembled into an electric double layer supercapacitor.At a current density of 1 A g^-1,the graphene paper assembled supercapacitor can have a specific capacity of 235 F g^-1,and can maintain an initial capacitance of 70%after 1000 cycles.Graphene microtubes have great application prospects in the field of flexible wearables.This paper proposes a simple and efficient method for preparing multi-channel graphene microtubes by electrostatic spray technology.Compared with other preparation methods of graphene microtubes,this method is simple and effective,and the deposition template is easy to remove,and the obtained microtubes have multi-channels.The prepared graphene microtubes exhibited good electrical conductivity and flexibility.The electrical was up to1.99×10⁴ S/m,and it had little change in bending resistance after hundreds of times.At the same time,in order to utilize the high specific surface area of the graphene microtubes,the TiO₂ was modified in the graphene microtubes,and it showed good photoelectric response characteristics in the photoelectric test.