an α-mno 2 @δ-mno 2 Preparation method and application of supercapacitor electrode material

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

Active Publication Date: 2020-12-25
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • an α-mno <sub>2</sub> @δ-mno <sub>2</sub> Preparation method and application of supercapacitor electrode material
  • an α-mno <sub>2</sub> @δ-mno <sub>2</sub> Preparation method and application of supercapacitor electrode material
  • an α-mno <sub>2</sub> @δ-mno <sub>2</sub> Preparation method and application of supercapacitor electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]1. Weigh potassium permanganate (KMnO) with a molar ratio of 1:3 (1.5mmol: 4.5mmol)4) And manganese carbonate (MnCO3), add deionized water, and stir at room temperature for 30 min. Weigh 1mmol of cobalt salt, add it to the mixed solution, stir it evenly, and sonicate it for 20min at room temperature. The mixed solution was transferred to a polytetrafluoroethylene reactor and reacted at 100°C for 8 hours. After the reaction is over, cool to room temperature, centrifuge with water and ethanol several times, and dry, and the product obtained is α-MnO2. Fromfigure 1 It can be seen that the prepared α-MnO2The length of the nanowires is uniform.figure 2 As you can see, α-MnO2The diameter of the nanowire is less than 300 nm.image 3 The uniform lattice fringe indicates that the product is a single-phase material, which is different from α-MnO2The experimental results of nanowire single-phase materials are consistent. FromFigure 4 It can be seen that the crystal type shows α type MnO2....

Embodiment 2

[0037]1. Weigh potassium permanganate (KMnO) with a molar ratio of 1:3 (1.5mmol: 4.5mmol)4) And manganese carbonate (MnCO3), add deionized water, and stir at room temperature for 30 min. Weigh 3mmol of cobalt salt, add it to the mixed solution, further stir it evenly, and ultrasound for 20min at room temperature. The mixed solution was transferred to a polytetrafluoroethylene reactor and reacted at 110°C for 7 hours. After the reaction is over, cool to room temperature, centrifuge with water and ethanol several times, and dry, and the product obtained is α-MnO2. FromFigure 6 It can be seen that with the increase of cobalt salt doping, α-MnO2The nanowires began to bend. FromFigure 7 It can be seen that the CV curve presents a similar rectangular shape, indicating that the material has good electrochemical properties.Picture 8 After calculation, α-MnO2The specific capacitance of the nanowire is about 150F g-1.

[0038]2. Weigh potassium permanganate (KMnO) with a molar ratio of 1:3 (1.5m...

Embodiment 3

[0040]1. Weigh potassium permanganate (KMnO) with a molar ratio of 1:3 (1.5mmol: 4.5mmol)4) And manganese carbonate (MnCO3), add deionized water, and stir for 30 min at room temperature. Weigh 1mmol of cobalt salt, add it to the mixed solution, stir it evenly, and sonicate it for 20min at room temperature. The mixed solution was transferred to a polytetrafluoroethylene reactor and reacted at 120°C for 6 hours. After the reaction is over, cool to room temperature, centrifuge with water and ethanol several times, and dry, and the product obtained is α-MnO2.

[0041]2. Weigh potassium permanganate (KMnO) with a molar ratio of 1:3 (1.5mmol: 4.5mmol)4) And manganese carbonate (MnCO3), add deionized water, and stir for 30 min at room temperature. The α-MnO obtained in step (1)2Transfer to the mixed solution, further stir evenly, and ultrasound 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 re...

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Abstract

The invention discloses a α-MnO 2 @δ‑MnO 2 Preparation method and application of supercapacitor electrode material. The preparation method includes the synthesis of α-MnO 2 Nanowire substrates on α‑MnO by a one-step hydrothermal method 2 Deposition of δ‑MnO on Nanowire Substrates 2 nanosheets to prepare α‑MnO 2 @δ‑MnO 2 Steps in the core-shell nanostructure. Prepared α‑MnO 2 @δ‑MnO 2 The microstructure of the core-shell nanocomposite is α‑MnO with a diameter of about 30 nm 2 Nanowires uniformly covered with δ-MnO 2 Nanosheets, therefore, have a high specific surface area, effectively shorten the ion transmission path, improve the electron transmission efficiency, increase the specific capacitance and mechanical stability of the electrode material, and the preparation method is simple and the yield is high.

Description

Technical field[0001]The invention relates to the field of supercapacitors, in particular to a kind of α-MnO2@δ-MnO2Preparation method and application of supercapacitor electrode material.Background technique[0002]Compared with secondary batteries, supercapacitors (SC) have special advantages, such as high power density, larger capacitance and longer cycle life. Generally, the electrode materials used for supercapacitors are divided into two types: electric double layer capacitors (EDLCs) and pseudocapacitive capacitors. For EDLC, energy storage is caused by electrostatic forces caused by the adsorption of electrolyte ions at the electrode / electrolyte interface. In contrast, pseudocapacitors based on transition metal oxide or hydroxide materials generally have a higher capacitance storage mechanism-a fast and reversible Faraday reaction between the active material and the electrolyte. Although they show high specific capacitance, transition metal oxides, namely RuO2, MnO2, NiO and V...

Claims

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Application Information

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Patent Type & Authority Patents(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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