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Preparation And Application Of Three - Dimensional Porous Carbon Nanotubes / Graphene / MnO <2> Composite Electrode

Posted on:2017-05-23Degree:MasterType:Thesis
Country:ChinaCandidate:C X ZouFull Text:PDF
GTID:2131330485453073Subject:Materials Science and Engineering
Abstract/Summary:PDF Full Text Request
As the fossil energy being increasingly depleted and environmental pollution serious increasingly, the development and application of new energy become the era theme, the super capacitor with its outstanding performance advantages popularity by many researchers, however, the shortage of the energy density still a problem to be solved, the basic way is to design and preparation new kinds of electrode materials. Carbon nanotubes (CNTs), Graphene (Graphene) and many other carbon nano materials have unique nanometer size effect, large specific surface area and good electrical conductivity, etc., are widely used in the field of electrode materials, however, only a single electric double layer capacitor cannot meet the demand of capacitor’s properties for people, so carbon based composite electrode material research and development become a research hotspot. Manganese dioxide is rich in natural reserves,with no pollution and has a high turns of theory capacitor. The preparation of metal oxide electrodes, which is a perfect choice, but its conductivity is greatly limited. Through composite carbon nanomaterials and manganese dioxide can improve the electrode conductivity, making full use of the synergistic effect between the electric double layer and the Faraday psedocapacitance to can make up for the shortage.In this paper, we use dealloyed of Cu30Mn70 alloy strips to forme three dimensional nano porous copper (NPC) as a non load nano metal catalyst, then through chemical vapor deposition (CVD) method to synthesis porous CNTs and Graphene, beside that, we systematic studied the influence of the growth of the catalyst, temperature and carbon source parameters such as carrier gas in the synthesis of carbon nano material, then oxidation-reduction method and hydrothermal method is used to load MnO2, at last, this kind of composite material was prepared as super capacitor electrode, the electrochemical performance is studied.The study’s results show that:using NPC as catalyst, through chemical vapor deposition (CVD) method can in situ synthesis a uniformity 3D structure of the nano porous CNTs/Graphene hybrid. NPC has high catalytic activity, easy in preperation and do not need a carrier, the catalyst distributed evenly and not easy to reunite. When reduction at 630℃ it is available to growth high yield of hollow porous CNTs with the diameter of about 30~50 nm, the yield is about 220%. With loading Ni/Y composite catalyst, the same morphology can be obtained under the condition, but the yield increased significantly up to 680%. After purification, plasma treatment and activation treatment, the specific capacitance performance can be made up from 34 F/g to 194 F/g, and has a good performance ratio. With MnO2 loading modification of the carbon hybrid nanostructure, the capacitance performance can be up to 242 F/g, after 5000 times of charge and discharge cycle, specific capacitance retain 98%, the interface bonding between MnO2 and carbon matrix is very strong.
Keywords/Search Tags:Composite electrode, Chemical vapor deposition, Porous carbon nanotubes, Graphene, Hybrid, Manganese dioxide, Capacitance
PDF Full Text Request
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