A composite material and method of preparation thereof
A composite material, covalent bonding technology, used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of high cost, unsuitable for large-scale industrial applications, and low mass density of pure graphene
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Embodiment 1
[0104] Example 1: Materials
[0105] NH can be obtained from the treatment of graphene oxide using one-step solvothermal reduction 2 -Modified graphene layer. G-O modification with O-containing functional groups such as carboxylic acid, phenol, lactone, carboxylic anhydride, ketone, ether, pyrone or quinine. Through nucleophilic substitution, functional groups can readily react with small-molecule inorganic amines in a solvothermal process. During this process, most of the O-containing functional groups in G-O were removed, while NH 2 - is covalently incorporated into graphene.
[0106] Typically, at least one type of amine precursor is heated with G-O in a suitable solvent (eg, DI water, ethanol, methanol, etc.) under solvothermal or reflux to a temperature above 60 °C for a certain period of time. After the reaction, the product was worked up with ethanol and DI water washes to remove excess unreacted amine.
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Embodiment 2
[0110] Example 2: Electrical Characterization
[0111] To compare the properties of AC / NHG / CP with AC and AC / CP, the electrode materials were tested in a 3-electrode system. When the scan rate was 2mV / s, the specific capacitances of AC / NHG / CP, AC and AC / CP were 330, 120 and 80F / g, respectively.
[0112] From the obtained results, it can be seen that when the scan rate is increased to 100mV / s, the capacitance retention of AC / NHG / CP still exceeds 200F / g, which is significantly higher than the value of about 80F / g for AC or AC / CP under the same measurement conditions higher. The capacitance value of the prepared AC / CP composite is comparable to that of pure AC. ACs lacking surface functional groups cannot provide anchor sites for CP attachment. Therefore, CP and AC entities are only assembled by physical contact. During the preparation, CP can be easily removed in the washing step. However, the AC / NHG blend showed a significant improvement in capacitance value after load...
Embodiment 3
[0113] Embodiment 3: model symmetrical supercapacitor device
[0114] To demonstrate the properties of AC / NHG / CP, AC / NHG / PANi was assembled into a model symmetric supercapacitor device. Properties to be demonstrated include capacitance value and supercapacitor behavior.
[0115] image 3 Cyclic voltammetry (CV) and charge / discharge curves of the supercapacitor device with both electrodes composed of AC / NHG / PANi are shown. image 3 The inset of (a) shows a photograph of the laboratory-scale AC / NHG / PANi supercapacitor device used for testing. The CVs of the AC / NHG / PANi devices show a large integration area and exhibit a rectangular curve shape, which is characteristic of an ideal supercapacitor with good dynamic charge spreading. The charge / discharge curves of AC / NHG / PANi devices at various currents are symmetrical, indicating that the AC / NHG / PANi system has high conductivity and excellent supercapacitive performance, which endows long cycle life and less safe question.
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