Preparation of three-dimensional graphene manganese dioxide nano-composite modified electrode and capacitive property test method thereof

A nanocomposite material, manganese dioxide technology, applied in the field of composite electrode preparation for supercapacitors, can solve problems such as difficult commercialization, and achieve the effect of overcoming poor electrical conductivity, good electrical conductivity, and low price

Active Publication Date: 2016-01-13
HAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, there have been many studies on Faraday pseudocapacitors, mostly using noble metal oxides such as ruthenium oxide and iridium oxide as electrode materials, which are not easy to achieve commercialization

Method used

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  • Preparation of three-dimensional graphene manganese dioxide nano-composite modified electrode and capacitive property test method thereof
  • Preparation of three-dimensional graphene manganese dioxide nano-composite modified electrode and capacitive property test method thereof
  • Preparation of three-dimensional graphene manganese dioxide nano-composite modified electrode and capacitive property test method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Accurately weigh 1.6 grams of graphite powder and 0.8 grams of HPPF with an electronic balance 6 , the weighed graphite powder and HPPF 6 Put it in an agate mortar and grind it evenly to get the ionic liquid modified carbon paste, then slowly fill the ionic liquid modified carbon paste into a glass tube with a length of 6cm and an inner diameter of 4mm for compaction, and insert a thin copper wire as a wire , to obtain ionic liquid modified carbon paste electrode (CILE), which was polished to a mirror surface on clean vulcanized paper before use.

Embodiment 2

[0033] Accurately weigh 5mg, 10mg, 15mg, 20mg, 25mg, 30mg, 35mg, 40mg, 45mg, 50mg graphite oxide powder (GO) and 1×10 -3 mol lithium perchlorate (Li(ClO 4 )) were mixed separately and dissolved in 10ml double-distilled water, ultrasonically dispersed evenly, the rate of nitrogen passing through the solution was 20ml / min~50ml / min, and the nitrogen passing time was 30min~40min. solution as electrolyte. Using the CILE electrode as the working electrode, the platinum sheet as the auxiliary electrode, and the saturated calomel electrode as the reference electrode, three-dimensional graphene was obtained on the surface of the CILE electrode by using the method of constant potential reduction of graphite oxide powder, and the deposition potential was -1.3V (vs.SCE) , deposition time 300s, optimize graphite oxide powder (GO) and lithium perchlorate (Li(ClO 4 )) Concentration ratio, it was found that 30mgGO and 1×10 -3 molLi(ClO 4 ) ratio is the best. At this time, a layer of grap...

Embodiment 3

[0035] Accurately weigh 30mgGO and 1×10 -3 molLi(ClO 4 ) dissolved in 10ml double-distilled water, ultrasonically dispersed evenly, the rate of nitrogen passing is 20ml / min-50ml / min, the time of nitrogen passing is 30min-40min, and the mixed solution is used as the electrolyte. Using the CILE electrode as the working electrode, the platinum sheet as the auxiliary electrode, and the saturated calomel electrode as the reference electrode, three-dimensional graphene was obtained on the surface of the CILE electrode by using the method of constant potential reduction of graphite oxide powder, and the deposition potential was -1.0V (vs. SCE), -1.1V(vs.SCE), -1.2V(vs.SCE), -1.3V(vs.SCE), -1.4V(vs.SCE), -1.5V(vs.SCE), deposition time 300s, it was found that the three-dimensional graphene obtained by electrochemical deposition had the best effect when the deposition potential was -1.3V (vs. SCE).

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Abstract

The invention discloses preparation of a three-dimensional graphene manganese dioxide nano-composite modified electrode and a capacitive property test method thereof. An ionic liquid modified electrode is prepared firstly, and then three-dimensional graphene and manganese dioxide nanomaterial are electrodeposited on the surface of the ionic liquid modified carbon paste electrode by utilizing a constant potential method so that a three-dimensional graphene manganese dioxide nano-composite modified carbon paste electrode is obtained. The three-dimensional graphene manganese dioxide nano-composite modified electrode acts as a working electrode, a platinum sheet acts as an auxiliary electrode and a saturated calomel electrode acts as a reference electrode, and capacitive property of three-dimensional graphene manganese dioxide nano-composite material is tested by applying a cyclic voltammetry, an AC impedance method and a constant current charge and discharge method. The three-dimensional graphene manganese dioxide nano-composite modified electrode is simple in preparation method, high in single electrode capacitance and great in cycle performance so as to be suitable for rapidly testing capacitive property of super-capacitor electrode material.

Description

technical field [0001] The invention relates to a capacitor electrode, which is a method for preparing a composite electrode of a super capacitor and a method for testing the capacitance performance thereof. Background technique [0002] With the rapid development of the world economy, energy issues and environmental pollution issues have become important factors affecting the economic development of various countries. Both new energy development and energy storage are international problems that need to be solved urgently. Supercapacitors are electrochemical energy storage devices with great application prospects. They have fast charge and discharge rates, high charge and discharge current densities, long cycle life and High capacity retention rate and other advantages. Activated carbon-based materials (graphene, carbon black, activated carbon, carbon nanofibers, carbon aerogels, carbon nanotubes, organic carbides, etc.), transition metal oxides (such as manganese oxide, n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/46H01G11/30H01G11/86H01G11/26H01G11/24G01R27/26
CPCY02E60/13
Inventor 王文成孙伟闫丽君牛学良
Owner HAINAN NORMAL UNIV
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