Preparation method and application of alpha-MnO2@delta-MnO2 supercapacitor electrode material

A technology for supercapacitors and electrode materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors. stable effect

Active Publication Date: 2019-05-14
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they show high specific capacitance, transition metal oxides, namely RuO 2 , MnO 2 , NiO and V 2 o 5 , often with low electrical conductivity and low ion diffusion rates, leading to reported reduction electrochemical performance.

Method used

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  • Preparation method and application of alpha-MnO2@delta-MnO2 supercapacitor electrode material
  • Preparation method and application of alpha-MnO2@delta-MnO2 supercapacitor electrode material
  • Preparation method and application of alpha-MnO2@delta-MnO2 supercapacitor electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Potassium permanganate (KMnO 4 ) and manganese carbonate (MnCO 3 ), add deionized water, and stir at room temperature for 30 min. Weigh 1 mmol of cobalt salt, add it into the mixture, stir evenly, and sonicate at room temperature for 20 min. The mixture was transferred to a polytetrafluoroethylene reactor and reacted at 100°C for 8h. After the reaction, cool to room temperature, centrifuge with water and ethanol several times, and dry, the resulting product is α-MnO 2 . from figure 1 It can be seen that the prepared α-MnO 2 The nanowires are uniform in length. figure 2 As can be seen in α-MnO 2 The nanowires are less than 300nm in diameter. image 3 Uniform lattice fringes indicate that the product is a single-phase material, which is consistent with α-MnO 2 The experimental results of nanowire single-phase materials are consistent. from Figure 4 It can be seen that the crystal form shows α-type MnO 2 .

[0032] 2. Potassium permanganate (KMnO 4 ) and...

Embodiment 2

[0037] 1. Potassium permanganate (KMnO 4 ) and manganese carbonate (MnCO 3 ), add deionized water, and stir at room temperature for 30 min. Weigh 3 mmol of cobalt salt, add it into the mixture, stir evenly, and sonicate at room temperature for 20 min. The mixture was transferred to a polytetrafluoroethylene reactor and reacted at 110°C for 7h. After the reaction, cool to room temperature, centrifuge with water and ethanol several times, and dry, the resulting product is α-MnO 2 . from Image 6 It can be seen that with the increase of cobalt salt doping amount, α-MnO 2 The nanowires start to bend. from Figure 7 It can be seen that the CV curves present a similar rectangular shape, indicating that the material has good electrochemical properties. Figure 8 After calculation, α-MnO 2 The specific capacitance of the nanowire is about 150F g -1 .

[0038] 2. Potassium permanganate (KMnO 4 ) and manganese carbonate (MnCO 3 ), add deionized water, and stir at room tempe...

Embodiment 3

[0040] 1. Potassium permanganate (KMnO 4 ) and manganese carbonate (MnCO 3 ), add deionized water, and stir at room temperature for 30 min. Weigh 1 mmol of cobalt salt, add it into the mixture, stir evenly, and sonicate at room temperature for 20 min. The mixture was transferred to a polytetrafluoroethylene reactor and reacted at 120°C for 6h. After the reaction, cool to room temperature, centrifuge with water and ethanol several times, and dry, the resulting product is α-MnO 2 .

[0041] 2. Potassium permanganate (KMnO 4 ) and manganese carbonate (MnCO 3 ), add deionized water, and stir at room temperature for 30 min. The α-MnO that step (1) obtains 2 Transfer to the mixed solution, further stir evenly, and sonicate for 30 min at room temperature. The mixed solution was transferred to a polytetrafluoroethylene reactor and reacted at 120°C for 6 hours. After the reaction was completed, it was cooled to room temperature, centrifuged with water and ethanol for several ti...

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Abstract

The invention discloses a preparation method and an application of an alpha-MnO2@delta-MnO2 supercapacitor electrode material. The preparation method comprises the steps of synthesizing an alpha-MnO2nanowire substrate; and depositing delta-MnO2 nanosheets on the alpha-MnO2 nanowire substrate to prepare an alpha-MnO2@delta-MnO2 core-shell nanostructure. The microstructure of the prepared alpha-MnO2@delta-MnO2 core-shell nano composite material is that an alpha-MnO2 nanowire with the diameter of about 30 nm is uniformly covered with the delta-MnO2 nanosheets, so that the material has very highspecific surface area, the transmission path of ions is effectively shortened, the transmission efficiency of electrons is improved, and the specific capacitance and the mechanical stability of the electrode material are improved; and the preparation method is simple and convenient, and is high in yield.

Description

technical field [0001] The present invention relates to the field of supercapacitors, in particular to a kind of α-MnO 2 @δ-MnO 2 Preparation method and application of supercapacitor electrode material. Background technique [0002] Compared with secondary batteries, supercapacitors (SCs) have particular advantages, such as high power density, larger capacitance, and longer cycle life. Generally, electrode materials for supercapacitors are divided into two types: electric double layer capacitors (EDLCs) and pseudocapacitors. For EDLCs, energy storage is caused by electrostatic forces induced by the adsorption of electrolyte ions at the electrode / electrolyte interface. In contrast, pseudocapacitors based on transition metal oxide or hydroxide materials typically have a higher capacitance storage mechanism—fast and reversible faradaic reactions between active materials and electrolytes. Although they show high specific capacitance, transition metal oxides, namely RuO 2 , ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/46H01G11/86
CPCY02E60/13
Inventor 牛和林郭昱周臣吴笛潘文康
Owner ANHUI UNIVERSITY
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