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Wide potential window delta-MnO2 electrode material and preparation method and application thereof

An electrode material and potential technology, applied in the direction of hybrid capacitor electrodes, manganese oxide/manganese hydroxide, etc., can solve the problems of complex method, unfavorable industrial application, no further improvement, etc., achieve simple method, improve energy density, improve Effect of Potential Window

Inactive Publication Date: 2020-11-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods only widen the potential window to 1.3v without further improvement. Moreover, these methods are complicated and not conducive to industrial applications

Method used

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  • Wide potential window delta-MnO2 electrode material and preparation method and application thereof
  • Wide potential window delta-MnO2 electrode material and preparation method and application thereof
  • Wide potential window delta-MnO2 electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Press KMnO 4 The molar ratio with KF is 1:1, 1mmol KMnO 4 , 1mmol KF were dissolved in 20ml of deionized water, mixed the two solutions evenly, adjusted the pH to 4 with HCl, added 3cm*3cm carbon cloth as the base material, and carried out hydrothermal reaction at 180°C for 60min. After the reaction, the product was deionized Rinse with water, dry in an oven at 60°C to obtain δ-MnO 2 Nanosheet array materials. The electrochemical performance is reflected in: the potential window can be raised to 0-1.25v, and the initial capacity can reach 283F / g at a current density of 1A / g.

Embodiment 2

[0030] Press KMnO 4 The molar ratio with KF is 1:2, 1mmol KMnO 4 , 2mmolKF ​​were respectively dissolved in 20ml deionized water, the two solutions were evenly mixed, and the 2 SO 4 Adjust the pH to 2, add a 3cm*3cm carbon cloth as the base material, and conduct a hydrothermal reaction at 120°C for 30 minutes. After the reaction, the product is rinsed with deionized water and oven-dried at 60°C to obtain a δ-MnO2 nanosheet array material. The electrochemical performance is reflected in: the potential window can be raised to 0-1.4v, and the initial capacity can reach 375F / g at a current density of 1A / g.

Embodiment 3

[0032] Press KMnO 4 The molar ratio with KF is 1:5, 1mmol KMnO 4 , 5mmolKF ​​were dissolved in 20ml deionized water, the two solutions were evenly mixed, and HNO 3 Adjust the pH to 3, add a 3cm*3cm carbon cloth as the base material, and conduct a hydrothermal reaction at 80°C for 60 minutes. After the reaction, the product is rinsed with deionized water, and dried in an oven at 60°C to obtain δ-MnO 2 Nanosheet array materials. The electrochemical performance is reflected in: the potential window can be raised to 0-1.3v, and the initial capacity can reach 315F / g at a current density of 1A / g.

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Abstract

The invention discloses a wide potential window delta-MnO2 electrode material and a preparation method and application thereof. The preparation method includes: mixing KMnO4 solution and KF solution uniformly, adjusting pH to 2 to 4, adding a substrate, and carrying out a hydrothermal reaction at 80 to 180 DEG C, after the reaction, rinsing and drying to obtain delta-MnO2 nanosheet array. In the wide potential window delta-MnO2 electrode material, K part between layers is replaced by protons, which increases energy barrier for manganese site migration, can inhibit ORE activity of raw materialsand promote improvement of electrochemical performance points. The method has a high degree of industrialization maturity, and is a promising way to prepare manganese oxide electrode materials for supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and relates to a wide potential window delta-MnO 2 Electrode materials and their preparation methods and applications in supercapacitors. Background technique [0002] In recent years, new energy storage devices such as supercapacitors (also called electrochemical capacitors) have attracted much attention at home and abroad. Supercapacitors can solve the demand for high power output of electric vehicles during starting or climbing, which is the key for electric vehicles to truly become the main body of traffic. The performance of a supercapacitor mainly depends on the quality of the electrode materials, especially the cathode materials. So far, the cathode material with better performance is RuO 2 system, but its high cost is not conducive to its large-scale production application. transition metal oxide MnO 2 It has the advantages of rich resources, wide range of material so...

Claims

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Application Information

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IPC IPC(8): C01G45/02H01G11/46
CPCC01G45/02H01G11/46C01P2002/72C01P2004/03C01P2004/61Y02E60/13
Inventor 徐璟卞海晨耿浩
Owner NANJING UNIV OF SCI & TECH
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