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Method for preparing disk-shaped MnO2 supercapacitor material with foamed nickel self-supporting nanosheet stack

A technology of supercapacitors and nanosheets, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., to achieve the effects of good reproducibility, high cycle stability, and high specific capacity

Active Publication Date: 2018-09-14
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no disc-shaped MnO stacked by nickel foam self-supporting nanosheets. 2 Related patent reports on nanosheet supercapacitor electrode materials

Method used

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  • Method for preparing disk-shaped MnO2 supercapacitor material with foamed nickel self-supporting nanosheet stack
  • Method for preparing disk-shaped MnO2 supercapacitor material with foamed nickel self-supporting nanosheet stack
  • Method for preparing disk-shaped MnO2 supercapacitor material with foamed nickel self-supporting nanosheet stack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Discoid MnO stacked with nickel foam self-supporting nanosheets 2 Preparation of electrode materials

[0028] In this embodiment, deionized water and ethanol are used to ultrasonically clean foamed nickel for 2 hours for pretreatment to remove surface impurities; manganese source, urea and ammonium fluoride are dissolved in deionized water, manganese source is manganese nitrate, manganese nitrate 0.15mol ·L -1 , Urea 0.15mol L -1 And ammonium fluoride 0.05mol L -1 , fully stirred to obtain a mixed reaction solution, then put the pretreated nickel foam into the reaction kettle, add the mixed reaction solution, and conduct a hydrothermal reaction at 130 ° C for 3 hours. After the reaction is completed and washed and dried, a nanosheet stacked discotic MnO 2 Precursor; discoidal MnO stacked with dried nanosheets 2 The precursor was placed in a muffle furnace and reacted at 350 °C for 2 h, and after cooling, the disc-shaped MnO with nanosheet stacks grown on ...

Embodiment 2

[0030] Embodiment 2 electrochemical performance test

[0031] In this example, the disk-shaped MnO stacked with foamed nickel self-supporting nanosheets prepared in Example 1 2 Made into a supercapacitor electrode for electrochemical performance testing. Test results such as image 3 As shown, when the electrolyte concentration is 6mol·L -1 Discoid MnO with nickel foam self-supporting nanosheet stacks in aqueous KOH solution 2 The maximum specific capacity of the electrode can reach 1.37F cm -2 . Depend on Figure 4 It can be seen that after 4000 cycles, the Coulombic efficiency remains 100%, and the capacity retention rate is 91.2%.

[0032] Experiments show that the as-prepared Ni foam self-supported nanosheet stacked disk-like MnO 2 The maximum specific capacity of the electrode can reach 1.37F cm -2 , after 4000 cycles, the Coulombic efficiency remains 100%, and the capacity retention rate is 91.2%.

Embodiment 3

[0033] Example 3 Discoid MnO stacked with nickel foam self-supporting nanosheets 2 Preparation of electrode materials

[0034] In this example, deionized water and ethanol were used to ultrasonically clean the nickel foam for 3 hours to remove the surface impurities; the manganese source, urea and ammonium fluoride were dissolved in deionized water, the manganese source was manganese sulfate, manganese sulfate 0.12mol L -1 , Urea 0.12mol L -1 And ammonium fluoride 0.04mol L -1 , fully stirred to obtain a mixed reaction solution, then put the pretreated nickel foam into the reaction kettle, add the mixed reaction solution, and conduct a hydrothermal reaction at 120 ° C for 4 hours. After the reaction is completed and cleaned and dried, a nanosheet stacked discotic MnO 2 Precursor; discoidal MnO stacked with dried nanosheets 2 The precursor was placed in a muffle furnace and reacted at 400 °C for 2 hours, and after cooling, a disc-shaped MnO with nanosheet stacks grown on th...

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Abstract

The invention belongs to the field of supercapacitors and particularly relates to a method for preparing a disk-shaped MnO2 supercapacitor material with foamed nickel self-supporting nanosheet stack.The method comprises the steps of preprocessing foamed nickel, growing a nano-sheet-stacked disk-shaped MnO2 precursor on the surface of the foamed nickel by hydrothermal reaction, and then calciningthe precursor to form a nano-sheet-stacked disk-shaped MnO2. The disk-shaped MnO2 supercapacitor material based on foamed nickel self-supporting nanosheet stack has excellent electrochemical performance. In the preparation process, raw materials are cheap and easy to obtain, the reaction time is short, the cost is low, the process is simple, and there is no template and no surfactant. A prepared disk-shaped MnO2 supercapacitor electrode with the foamed nickel self-supporting nanosheet stack has a high specific capacity and cycle stability. The maximum specific capacity can reach 1.37F*cm-2, after 4000 cycles, the Coulomb efficiency is maintained at 100%, and the capacity retention rate is 91.2%.

Description

technical field [0001] The invention belongs to the field of supercapacitors, in particular to a disk-shaped MnO stacked with nickel foam self-supporting nanosheets 2 Preparation method of supercapacitor material. technical background [0002] At present, the focus of research in the field of energy is the development and utilization of green energy, but most of the green energy has the disadvantage of uneven distribution in time and space. Therefore, reliable energy storage devices have become a topic of concern for researchers. As an energy storage device, supercapacitors are favored by scholars at home and abroad because they can convert clean energy into needed electrical energy. Supercapacitors have high power density, stable cycle performance, and fast charge and discharge performance, making them widely used in the energy field. [0003] In the large family of supercapacitor electrode materials, manganese dioxide has become one of the most potential electrode materi...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/46H01G11/30H01G11/86
Inventor 吴春贾传坤丁美楼雪纯
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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