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Manganese dioxide nanorod/graphene composite electrode material and preparation method thereof

A graphene composite and electrode material technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of electrochemical performance impact, poor conductivity of MnO2, etc., achieve low raw material cost, easy graphene composite, highly reproducible results

Inactive Publication Date: 2014-01-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to MnO 2 Its own poor conductivity has a great impact on its electrochemical performance.

Method used

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  • Manganese dioxide nanorod/graphene composite electrode material and preparation method thereof
  • Manganese dioxide nanorod/graphene composite electrode material and preparation method thereof
  • Manganese dioxide nanorod/graphene composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1). Graphite oxide (GO) was prepared by the modified Hummers method.

[0022] 2). Disperse the prepared GO in deionized water and ultrasonically treat it for 60min to obtain a dispersion solution of GO (0.5mg mL -1 ).

[0023] 3). Add 30wt% glucose and 25wt% ammonia water to the above solution and stir for 15min. Then the mixed solution was stirred in a 95 °C water bath for 1 h.

[0024] 4). After cooling, the black uniform suspension was centrifuged, filtered and washed, and dried at 50° C. for 12 hours to obtain pure graphene. GO, glucose, and ammonia can be scaled proportionally. The specific volume ratio is GO dispersion liquid: glucose solution: ammonia water = 100:10:1.

[0025] 5). Disperse 0.05g graphene in 80mL deionized water and sonicate for 20min.

[0026] 6). The equimolar concentration of MnSO 4 and KMnO 4 (0.03M) was added to the above solution and stirred for 1 h to obtain a precursor solution. Graphene, MnSO 4 , KMnO 4 All three can be scaled ...

Embodiment 2

[0030] 1). Graphite oxide (GO) was prepared by the modified Hummers method.

[0031] 2). Disperse the prepared GO in deionized water and ultrasonically treat it for 60min to obtain a dispersion solution of GO (0.5mg mL -1 ).

[0032] 3). Add 30wt% glucose and 25wt% ammonia water to the above solution and stir for 15min. Then the mixed solution was stirred in a 95 °C water bath for 1 h.

[0033] 4). After cooling, the black uniform suspension was centrifuged, filtered and washed, and dried at 50° C. for 12 hours to obtain pure graphene. GO, glucose, and ammonia can be scaled proportionally. The specific volume ratio is GO dispersion liquid: glucose solution: ammonia water = 100:10:1.

[0034] 5). Disperse 0.05g graphene in 80mL deionized water and sonicate for 20min.

[0035] 6). The equimolar concentration of MnSO 4 and KMnO 4 (0.06M) was added to the above solution and stirred for 1 h to obtain a precursor solution. Graphene, MnSO 4 , KMnO 4 All three can be scaled ...

Embodiment 3

[0039] 1). Graphite oxide (GO) was prepared by the modified Hummers method.

[0040]2). Disperse the prepared GO in deionized water and ultrasonically treat it for 60min to obtain a dispersion solution of GO (0.5mg mL -1 ).

[0041] 3). Add 30wt% glucose and 25wt% ammonia water to the above solution and stir for 15min. Then the mixed solution was stirred in a 95 °C water bath for 1 h.

[0042] 4). After cooling, the black uniform suspension was centrifuged, filtered and washed, and dried at 50° C. for 12 hours to obtain pure graphene. GO, glucose, and ammonia can be scaled proportionally. The specific volume ratio is GO dispersion liquid: glucose solution: ammonia water = 100:10:1.

[0043] 5). Disperse 0.05g graphene in 80mL deionized water and sonicate for 20min.

[0044] 6). The equimolar concentration of MnSO 4 and KMnO 4 (0.03M) was added to the above solution and stirred for 1 h to obtain a precursor solution. Graphene, MnSO 4 , KMnO 4 All three can be scaled p...

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Abstract

The invention belongs to the technical field of supercapacitor materials and provides a manganese dioxide nanorod / graphene composite electrode material and a preparation method thereof. The method comprises the following steps that graphite oxide is obtained through an improved Hummers method, the graphite oxide is reduced to be graphene by utilizing glucose and ammonium hydroxide, the graphene is dispersed into deionized water for ultrasonic processing and is mixed with equimolar manganese dioxide solution and potassium permanganate solution, and a precursor is obtained; hydrothermal reaction is conducted on the precursor for 8-24 hours at 120-180 DEG C; a reaction product is centrifuged, filtered, washed and dried for 24 hours at 180 DEG C, and the pure manganese dioxide nanorod / graphene composite electrode material is obtained. The preparation method of the manganese dioxide nanorod / graphene composite electrode material is simple in process and high in repeatability. The material has the good electrochemical property and is suitable for being used as an electrode material for a supercapacitor.

Description

technical field [0001] The invention relates to a manganese dioxide nanorod / graphene composite electrode material and a preparation method thereof, belonging to the technical field of supercapacitor materials. Background technique [0002] With the further development of society, environmental and energy issues are becoming more and more prominent. Therefore, there is an urgent need for an environmentally friendly and sustainable form of energy storage. Supercapacitors have received more and more attention in recent years. Compared with lithium-ion batteries and traditional capacitors, supercapacitors have higher energy density and power density. [0003] Electrode materials are one of the key factors determining the electrochemical performance of supercapacitors, so the research and development of electrode materials with excellent performance is the core topic of supercapacitor research. Transition metal oxide RuO 2 The specific capacity up to 760F / g is generated by re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/46H01G11/38H01G11/86
CPCY02E60/13
Inventor 汪浩邓思旭吴春卉严辉孙玉绣刘晶冰
Owner BEIJING UNIV OF TECH
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