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Preparation method of MnO<2>/Ti<3>C<2>T<x>Mxene flexible supercapacitor electrode material
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A technology for supercapacitors and electrode materials, applied in hybrid capacitor electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as poor conductivity, limited energy density and durability, and achieve good conductivity, Effect of high energy density and excellent cycle stability
Pending Publication Date: 2018-11-13
重庆化工职业学院 +1
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[0008] The purpose of the invention is to solve the problem of MnO 2 As an electrode material for supercapacitors, there are problems of poor conductivity, limited energy density and durability
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Embodiment 1
[0029] 1)Ti 3 C 2 T x Preparation of:
[0030] 1.1) Add 2g LiF to 20ml HCl and stir until clear to prepare corrosion solution.
[0031] 1.2) Add 2g Ti to the solution in step 1.1) 3 AlC 2 powder, the solution was heated to 40°C for 24 hours, then washed 5 times with deionized water, and centrifuged until the pH of the supernatant was about 6.
[0032] 1.3) The centrifuged solid in step 1.2) was vacuum-dried at 60°C for 12 hours to obtain Ti 3 C 2 Tx powder.
[0033] 2) MnO 2 / Ti 3 C 2 T x Preparation of composite materials:
[0034] 2.1) Weigh 0.36mmol MnCl 2 4H 2 O, 50 mg Ti from step 1) 3 C 2 T x , Disperse the two in 50ml of isopropanol, sonicate for 1-3h to obtain a stable suspension, stir and heat the suspension to 80-100°C.
[0035] 2.2) 0.24 mmol KMnO 4 Dissolve in 5ml deionized water to make the reacted MnO 2 and Ti 3 C 2 T x The theoretical mass ratio is 1.0; then quickly added to the suspension in step 2.1), condensed and refluxed for 20-40min,...
Embodiment 2
[0038] Change MnCl 2 4H 2 The amount of O is 0.086mmol, KMnO 4 The amount is 0.057mmol, so that the reacted MnO 2 and Ti 3 C 2 T x The theoretical mass ratio is 0.25; other conditions are the same as in Example 1, the obtained MnO 2 / Ti 3 C 2 T x The electrode material is made into a flexible supercapacitor for electrochemical performance measurement, and the measured specific capacitance is 8.5mF cm -2 .
Embodiment 3
[0040] Change MnCl 2 4H 2 The amount of O is 0.17mmol, KMnO 4 The amount is 0.12mmol, so that the MnO after the reaction 2 and Ti 3 C 2 T x The theoretical mass ratio is 0.5; other conditions are the same as in Example 1, the obtained MnO 2 / Ti 3 C 2 T x The electrode material was made into a flexible supercapacitor for electrochemical performance measurement, and the measured specific capacitance was 9.2mF cm -2 .
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Abstract
The invention discloses a preparation method of a MnO<2>/Ti<3>C<2>T<x>Mxene flexible supercapacitor electrode material, and belongs to the technical field of energy storage materials. According to thepreparation method, MnO<2>and Ti<3>C<2>T<x>Mxene are combined to prepare the flexible supercapacitor electrode material with high electrochemical performance and mechanical property. Specifically, LiF and HCl are used as corrosive liquids, and an Al layer of Ti<3>AlC<2> is corroded to obtain Ti<3>C<2>T<x>; then MnCl<2>.4H<2>O and Ti<3>C<2>T<x> are mixed and heated at a certain mass ratio to be subjected to a redox reaction under the effect of KMnO<4> to enable the generated MnO<2> nano rods to be deposited on Ti<3>C<2>T<x>; and finally, washing and drying are carried out to obtain the flexible supercapacitor electrode material. According to the invention, MnO<2>with excellent specific capacitance is utilized, and specific to the defect that the conductive performance thereof is poor, an in-situ deposition method is adopted; the MnO<2> nano rods are deposited on the Ti<3>C<2>T<x>Mxene material with excellent conductivity to obtain the flexible MnO<2>/Ti<3>C<2>T<x>Mxene composite electrode material, so that not only rapid transmission of electrons is ensued, but also the resistance of the system is lowered; and the capacitor prepared by the electrode material has the characteristicsof high flexibility, excellent cycling stability, high energy density and the like.
Description
technical field [0001] The present invention relates to a kind of MnO 2 / Ti 3 C 2 T x The invention discloses a method for preparing an Mxene supercapacitor electrode material, which belongs to the technical field of energy storage materials, and in particular relates to a method for preparing a flexible supercapacitor electrode material. The technical feature of this method is that the MnO with high theoretical specific capacitance 2 Material and Ti with good conductivity and good flexibility 3 C 2 T x Mxene materials are compounded to prepare flexible supercapacitors with excellent performance. Background technique [0002] As a new type of energy storage device between batteries and traditional capacitors, supercapacitors have the characteristics of high power density, high charge and discharge efficiency, good cycle stability, and environmental protection, so they are widely used in various fields. However, the low energy density has become an important factor re...
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