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Preparation method of nano-manganese dioxide electrode

A manganese dioxide electrode and electrode technology, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of complex powder preparation process and low specific surface area impedance.

Inactive Publication Date: 2014-06-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problem of existing nanometer MnO 2 The technical problem of the powder preparation process is relatively complicated, and it provides a one-time molding, environmentally friendly, and low-cost preparation method; the obtained manganese dioxide nanowires have a large specific surface area and low impedance, and can be used as supercapacitors The CV curve has obvious pseudocapacitor characteristics and good supercapacitor characteristics at the positive electrode

Method used

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  • Preparation method of nano-manganese dioxide electrode
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  • Preparation method of nano-manganese dioxide electrode

Examples

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example 1

[0026] (1) With nickel foam as the substrate, ultrasonic cleaning with acetone solution, deionized water, dilute hydrochloric acid solution (concentration 5%), and deionized water for 10 minutes before constant current pulse deposition, and then placed in a vacuum oven at 100 °C after cleaning Dry in medium.

[0027] (2) 14.7g C 4 h 6 MnO 4 .H 2 O and 5.1g NaNO 3 Prepare 200ml of manganese acetate aqueous solution containing 0.3M sodium nitrate, and add ammonia water drop by drop at room temperature to adjust the pH value to 6.5.

[0028] (3) Nickel foam is the working electrode, graphite plate is the counter electrode, the solution prepared in step (2) is the electrodeposition solution, and a two-electrode system is used for constant current pulse electrodeposition. The deposition parameters are: the anode applied current is 10mA cm -2 , corresponding to the power-on time (T on ) 20S; the cathode current is -10mA·cm -2 , corresponding to the power-on time (T off ) 5S...

example 2

[0032] (1) With nickel foam as the substrate, ultrasonic cleaning with acetone solution, deionized water, dilute hydrochloric acid solution (concentration 5%), and deionized water for 10 minutes before constant current pulse deposition, and then placed in a vacuum oven at 100 °C after cleaning Dry in medium.

[0033] (2) 9.8g C 4 h 6 MnO 4 .H 2 O and 5.1g NaNO 3 Prepare 200ml of manganese acetate aqueous solution containing 0.3M sodium nitrate, and add ammonia water drop by drop at room temperature to adjust the pH value to 6.5.

[0034] (3) Nickel foam is the working electrode, graphite plate is the counter electrode, the solution prepared in step (2) is the electrodeposition solution, and a two-electrode system is used for constant current pulse electrodeposition. The deposition parameters are: the anode applied current is 10mA cm -2 , corresponding to the power-on time (T on ) 20S; the cathode current is -10mA·cm -2 , corresponding to the power-on time (T off ) 5S,...

example 3

[0038] (1) With nickel foam as the substrate, ultrasonic cleaning with acetone solution, deionized water, dilute hydrochloric acid solution (concentration 5%), and deionized water for 10 minutes before constant current pulse deposition, and then placed in a vacuum oven at 100 °C after cleaning Dry in medium.

[0039] (2) 9.8g C 4 h 6 MnO 4 .H 2 O and 6.8g NaNO 3 Prepare 200ml of manganese acetate aqueous solution containing 0.4M sodium nitrate, and add ammonia water drop by drop at room temperature to adjust the pH value to 6.5.

[0040] (3) Nickel foam is the working electrode, graphite plate is the counter electrode, the solution prepared in step (2) is the electrodeposition solution, and a two-electrode system is used for constant current pulse electrodeposition. The deposition parameters are: the anode applied current is 10mA cm -2 , corresponding to the power-on time (T on ) 20S; the cathode current is -10mA·cm -2 , corresponding to the power-on time (T off ) 5S,...

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Abstract

The invention provides a preparation method of a nano-manganese dioxide electrode, and belongs to the field of preparation of electrode materials. The preparation method comprises the following specific steps of: (1) pretreating the surface of foam nickel by use of acetone and 5% hydrochloric acid; (2) taking soluble salt of manganese as main salt, and NaNO3 as an addition agent, preparing an electric deposition liquid at room temperature, and adjusting the pH value to 6.5-7.0 by ammonia water dropwise; (3) taking foam nickel as a base body, and a graphite plate as a counter electrode, so that the manganese dioxide electrode can be prepared by the constant current pulse deposition of a two-electrode system; and (4) drying at 80 DEG C to obtain the nano-wire manganese dioxide electrode. The CV (coefficient of variation) curve has an obvious oxidation / reduction peak when the obtained nano-wire manganese dioxide is taken as an electrode of a super capacitor; and the nano-manganese dioxide electrode is larger in superficial area, so that the use ratio of a manganese dioxide active substance can be improved, therefore, the nano-manganese dioxide electrode is higher in specific volume and good in super capacitor characteristic.

Description

technical field [0001] The invention belongs to the field of electrode materials prepared by one-step molding, and particularly relates to the addition of NaNO 3 Nano-manganese dioxide electrode material with high specific capacity and good capacitance performance was prepared by pulse electrodeposition in aqueous solution. Background technique [0002] The power density of supercapacitors is more than ten times higher than that of batteries, the ability to store charges is much higher than that of ordinary capacitors, and it has the advantages of fast charging and discharging, no pollution to the environment, and long cycle life, so it has attracted widespread attention. According to the principle of energy storage, it can be divided into electric double layer capacitor and pseudo capacitor. with RuO 2 The representative noble metal oxide has smaller impedance, larger specific capacitance, and higher energy density, and is an electrode material with more excellent superca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 孔祥华李美玲王晓峰尤政宋长霖刘茂林
Owner UNIV OF SCI & TECH BEIJING
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