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Ultra-fine grain metallic oxide and porous carbon electrode and preparation method thereof

A technology of porous carbon electrodes and ultra-fine grains, applied in the direction of hybrid capacitor electrodes, etc., can solve problems such as uneven dispersion and lower specific capacity of materials, and achieve the effects of simple process, controllable operation, and mild preparation conditions

Active Publication Date: 2014-09-10
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the metal oxides prepared in this way are unevenly dispersed in the carbon matrix, and on the other hand, they tend to aggregate into large particles on the carbon surface during heat treatment, which will reduce the specific capacity of the material.

Method used

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  • Ultra-fine grain metallic oxide and porous carbon electrode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] 1. Synthesis of zif-67

[0021] Weigh 0.5gCo(NO 3 ) 2 ·6H 2 O was dissolved in 50ml deionized water to form A solution; 2-methylimidazole and triethylamine (TEA) were weighed and dissolved in 50ml deionized water to form B solution; A and B solutions were ultrasonically stirred for 10min respectively and mixed; wherein, Co (NO 3 ) 2 ·6H 2 The molar ratio of O, 2-methylimidazole and triethylamine (TEA) is 1:16:16. The mixed solution was ultrasonically stirred at room temperature for 10 minutes, then centrifuged and washed with deionized water for 2-3 times; placed in an oven at 80° C. for 12 hours to obtain zif-67 powder.

[0022] 2. Preparation of ultrafine grain metal oxide / porous carbon composites

[0023] The prepared zif-67 powder was carbonized in a high-temperature furnace at 1000°C for 6 hours, and the carbonization atmosphere was nitrogen to obtain an ultrafine-grained metal oxide / porous carbon composite material. High-resolution transmission electron mi...

Embodiment 2

[0028] 1. Synthesis of zif-67

[0029] Weigh 0.5gCo(NO 3 ) 2 ·6H 2 O was dissolved in 50ml deionized water to form A solution; 2-methylimidazole and triethylamine (TEA) were weighed and dissolved in 50ml deionized water to form B solution; A and B solutions were ultrasonically stirred for 10min respectively and mixed; wherein, Co (NO 3 ) 2 ·6H 2 The molar ratio of O, 2-methylimidazole and triethylamine (TEA) is 1:16:16. The mixed solution was ultrasonically stirred at room temperature for 10 minutes, then centrifuged and washed with deionized water for 2-3 times; placed in an oven at 80° C. for 12 hours to obtain zif-67 powder.

[0030] 2. Preparation of ultrafine grain metal oxide / porous carbon composites

[0031] The prepared zif-67 powder was carbonized in a high-temperature furnace at 800°C for 6 hours, and the carbonization atmosphere was nitrogen to obtain an ultrafine-grained metal oxide / porous carbon composite material.

[0032] 3. Electrode preparation

[003...

Embodiment 3

[0036] 1. Synthesis of zif-67

[0037] Weigh 0.5gCo(NO 3 ) 2 ·6H 2 O was dissolved in 50ml deionized water to form A solution; 2-methylimidazole and triethylamine (TEA) were weighed and dissolved in 50ml deionized water to form B solution; A and B solutions were ultrasonically stirred for 10min respectively and mixed; wherein, Co (NO 3 ) 2 ·6H 2The molar ratio of O, 2-methylimidazole and triethylamine (TEA) is 1:8:8. The mixed solution was ultrasonically stirred at room temperature for 10 minutes, then centrifuged and washed with deionized water for 2-3 times; placed in an oven at 80° C. for 12 hours to obtain zif-67 powder.

[0038] 2. Preparation of ultrafine grain metal oxide / porous carbon composites

[0039] The prepared zif-67 powder was carbonized in a high-temperature furnace at 1000°C for 6 hours, and the carbonization atmosphere was nitrogen to obtain an ultrafine-grained metal oxide / porous carbon composite material.

[0040] 3. Electrode preparation

[0041]...

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Abstract

The invention discloses an ultra-fine grain metallic oxide and porous carbon electrode and a preparation method thereof. The preparation method of the ultra-fine grain metallic oxide and porous carbon electrode comprises preparing zif-67 powder, arranging the zif-67 powder into a high temperature furnace to be performed on carbonization and obtaining ultra-fine grain metallic oxide and porous carbon composite materials; adding solvent NMP and obtaining mixed liquor with the ultra-fine grain metallic oxide and porous carbon composite materials serving as active materials, the carbon black serving as the conductive agent and the polytetrafluoroethylene serving as the adhesive; dropping the prepared mixed liquor on a carbon paper sheet, arranging an electrode plate into a vacuum oven to be dried and obtaining the ultra-fine grain metallic oxide and porous carbon electrode. The preparation method of the ultra-fine grain metallic oxide and porous carbon electrode is mild in preparation condition, simple in technology and controllable in operation. The specific capacitance of the obtained ultra-fine grain metallic oxide and porous carbon electrode achieves 220 F per gram, 205 F per gram and 200 F per gram when the charge-discharge electric current density of ultra-fine grain metallic oxide and porous carbon electrode achieves 200 milliampere per gram, 500 milliampere per gram, 100 milliampere per gram and 2000 milliampere per gram in the sodium hydroxide solution with the concentration to be 1 mole per liter and the specific capacitance is reduced by 2.8 % after the ultra-fine grain metallic oxide and porous carbon electrode is charged and discharged for 1000 times.

Description

technical field [0001] The invention relates to the field of chemical material preparation, in particular to an ultrafine grain metal oxide / porous carbon electrode and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage element. Due to its advantages of fast storage and release of energy, it can be used as a backup power supply for electronic systems such as computers, flash and ignition devices in industrial equipment, high-power microwave and laser weapons and electric There are also broad application prospects in the hybrid power supply of automobiles. The structural properties of electrode materials play a decisive role in the performance of supercapacitors. At present, the research on supercapacitor electrode materials mainly focuses on activated carbon, carbon nanotubes, transition metal oxides and organic conductive polymers. The carbon electrode material is cheap and the preparation process is simple, but the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/46H01G11/34
Inventor 委福祥蒋佳强于跟喜李祥人
Owner CHINA UNIV OF MINING & TECH