Two-dimensional metal titanium carbide loaded MnOx quantum dot electrode material and application thereof

An electrode material, titanium carbide technology, applied in the field of materials, can solve the problems of low specific capacity and poor rate performance, and achieve high specific capacity, improve rate performance, and small size.

Active Publication Date: 2022-01-04
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a two-dimensional metal titanium carbide loaded MnO with high rate and high specific capacity for the relatively poor rate performance and relatively low specific capacity of MXene in ionic liquid electrolyte. x Quantum dot electrode material

Method used

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  • Two-dimensional metal titanium carbide loaded MnOx quantum dot electrode material and application thereof
  • Two-dimensional metal titanium carbide loaded MnOx quantum dot electrode material and application thereof
  • Two-dimensional metal titanium carbide loaded MnOx quantum dot electrode material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Preparation of two-dimensional metal titanium carbide nanosheets: 2g lithium fluoride and 9M 40ml hydrochloric acid were stirred in a Teflon beaker for 30min; 2g Ti 3 AlC 2 Slowly add to the above beaker, continue to stir for 24h (keep the temperature at 35°C), centrifuge the obtained reaction liquid (3500rpm, 10min), pour off the supernatant after centrifugation, then add 40ml of deionized water to the precipitate, and dissolve the solution Pour it into a three-neck bottle, add ice cubes, and sonicate at low temperature for 30 minutes (maintained by Ar gas), take it out and continue centrifuging (3500rpm, 10min), repeat several times until the pH value of the liquid poured out after centrifugation reaches 5, and collect the lower sediment; Add 40ml of ethanol to the sediment and sonicate at low temperature for 1h, centrifuge (8000 rpm, 20min), and collect the lower sediment; liquid; the black rice-colored liquid was subpackaged and freeze-dried to obtain MXene powder....

Embodiment 2

[0041] Preparation of manganese oxide@MXene: 1mg of Mn 2 (CO) 10 Dissolve in 5mL of N,N-dimethylformamide (DMF), then pipette 0.25mL of octylamine dropwise to the above Mn 2 (CO) 10 20mg of MXene prepared in Example 1 was then dispersed into 10mL of DMF under ultrasonic assistance for 5min; then the Mn containing octylamine 2 (CO) 10 DMF solution was added dropwise to 10mL of MXene dispersion under stirring condition, and ultrasonicated for 10min to make it evenly mixed. Finally, the above mixed liquid was transferred to a polytetrafluoro-lined stainless steel autoclave, and 0.1 g of ascorbic acid was added as an antioxidant, and the reaction was kept at 170° C. for 2 h. The above solution was suction filtered, washed with absolute ethanol and deionized water several times, and then freeze-dried to obtain MnO x NDs@MXene composites, x = 4 / 3.

[0042] From figure 1 b and figure 2 It is known that the MXene loaded MnO prepared according to the above experimental steps ...

Embodiment 3

[0044] Manganese oxide@MXene electrode was prepared and its electrochemical performance was tested; the MnO x NDs@MXene material, graphite powder and polytetrafluoroethylene emulsion are mixed uniformly at 85wt%, 15wt%, and 5wt% by weight, and then coated on the foamed nickel sheet, and the foamed nickel sheet coated with the electrode material is rolled and dried, and then cut into Carbon quantum dot electrode sheet; the electrolyte is 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIM-BF 4 ) ionic liquid.

[0045] From image 3 It is known that in this example, the manganese oxide quantum dot-loaded MXene composite electrode uses EMIM-BF in the three-electrode system 4 The cyclic voltammetry curve measured when the ionic liquid is used as the electrolyte scan rate is 20mV / s, from the CV curve, the voltage window is -1.5V-0.5V, which has a similar rectangular shape, indicating that it has a relatively ideal capacitance behavior. The curve shows a pair of obvious redox pe...

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Abstract

The invention discloses a two-dimensional metal titanium carbide loaded MnOx quantum dot electrode material which is an MXene loaded manganese oxide nano dot composite material prepared by taking MXene with high conductivity as a base material and manganese carbonyl as a precursor through a simple solvothermal reaction. And the ionic liquid is selected as the electrolyte, so that the working voltage window is further widened, and the energy density is improved. The oxide nanodot is a pseudocapacitance material with a quantum size effect, and the composite material prepared by loading the oxide nanodot on the surface of MXene can improve the reaction activity and increase pseudocapacitance; as a barrier material, the nanodots can avoid stacking and collapse of MXene sheet layers; the prepared composite material is further prepared into an electrode for a supercapacitor, and an electrochemical test result in an ionic liquid electrolyte shows that the specific capacity and the rate capability are remarkably improved. And the method has certain universality, can be applied to systems of other electrode materials loaded with ultra-small-size metal oxides, and has a relatively good application prospect.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a two-dimensional metal titanium carbide loaded MnOx quantum dot electrode material and its application in preparing supercapacitors. Background technique [0002] Supercapacitors (SCs) are recognized as one of the most promising energy storage technologies due to their high power, fast charge / discharge, long cycle life, high reliability, maintenance-free, and environmental friendliness. It has been widely studied and applied, including mobile phones, hybrid vehicles, medical equipment, military equipment, storage backup systems and complex power supply systems and other fields. Nevertheless, supercapacitors have relatively low energy density compared with batteries, which seriously hinders the widespread use of supercapacitors. According to the calculation formula of energy density (E=1 / 2CV 2 ), increasing the specific capacity (C) or expanding the voltage window (V) can e...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/36
CPCH01G11/46H01G11/36Y02E60/13
Inventor 申保收郝蓉黄蓉
Owner NORTHWEST UNIV
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