Preparation method and application of a nano flower-like polypyrrole manganese oxide composite material

A composite material, a technology of manganese oxide is applied in the field of preparation of nano-flower-like polypyrrole-manganese oxide composite materials, which can solve the problems of difficult protonation, insoluble in organic solutions, difficult processing, etc., and improve the ability to store electric charges. Effect

Active Publication Date: 2021-07-02
SHENYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have proved that the skeleton structure of PPy is (2,5) coupling of pyrrole monomer rings; in the whole PPy molecular skeleton structure, the arrangement directions of adjacent pyrrole rings are different, so two pyrrole rings constitute a repeating unit in the PPy molecule , N in PPy is sp2 hybridization, the lone pair of electrons on N participates in the formation of π-conjugated system, it is difficult to protonate, and the basicity is very weak, so the α position of Py is the active site; the intrinsic state of PPy is very poor in conductivity, And it is insoluble in organic solution and difficult to process. These factors restrict its application. Usually, the prepared PPy exists in a cauliflower-like structure

Method used

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  • Preparation method and application of a nano flower-like polypyrrole manganese oxide composite material
  • Preparation method and application of a nano flower-like polypyrrole manganese oxide composite material
  • Preparation method and application of a nano flower-like polypyrrole manganese oxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 0.03M manganese acetate, 0.05M ammonium acetate and 0.2mL pyrrole, and react for 45 minutes under the condition of constant potential 0.9Vvs. manganese composite; then rinsed with deionized water and dried. That is, the electrochemical co-deposition of polypyrrole and manganese oxide can use the nano-flower-like structure of manganese oxide to further guide the structure of the electrode surface during pyrrole polymerization, and then prepare nano-flower-like polypyrrole-manganese oxide composite materials, such as figure 1 .

[0022] at 0.5M Na 2 SO 4 In the solution, the nano flower-like polypyrrole-manganese oxide composite material and polypyrrole are used for constant potential charge and discharge at 2mA / cm2, such as figure 2 As shown, the nanoflower-like polypyrrole-manganese oxide composite has a longer discharge time, and its ability to store charges is far superior to that of polypyrrole. The nanoflower-like composite structure increases the specific...

Embodiment 2

[0024] at 0.5M Na 2 SO 4 AC impedance applications of nanoflower-like polypyrrole-manganese oxide composites and polypyrrole in solution, such as image 3 As shown, no semicircle appears in the high-frequency domain, indicating that the charge transfer resistance at the electrode-electrolyte interface is negligible. In the low-frequency domain, the nanoflower-like PPyrrole-manganese oxide composite shows a steep slope, which means it has a smaller ion diffusion resistance than PPyrrole.

Embodiment 3

[0026] The nano-flower-like polypyrrole-manganese oxide composite material prepared in Example 1 and polypyrrole are assembled into a symmetrical supercapacitor, and the device assembled with the nano-flower-like polypyrrole-manganese oxide composite material and polypyrrole is charged in less than 1 minute In the case of , you can power the LED bulb for 7 minutes.

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Abstract

The invention belongs to the technical field of nano-material preparation, in particular to a preparation method of a nano-flower polypyrrole-manganese oxide composite material. Using manganese oxide (MnO 2 ) and conductive polymer electrochemical co-deposition, prepared a nano-flower-like polypyrrole-manganese oxide composite material with a large potential window range (-0.3 ~ 0.9V vs. SCE), which can be used as a supercapacitor electrode material, and Effectively expand the energy storage potential range of manganese oxide (0-0.9V vs. SCE) and polypyrrole (-0.3-0.5V vs. SCE); the electrochemical co-deposition method adopted in the present invention is convenient, fast and environmentally friendly , and has the characteristics that the experimental reaction conditions are easy to control, and the product does not need post-treatment.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method and application of a nano flower-like polypyrrole-manganese oxide composite material. Background technique [0002] Using manganese oxide (MnO 2 ) and conductive polymer electrochemical co-deposition, prepared a nano-flower-like polypyrrole-manganese oxide composite material with a large potential window range, which can be used as an electrode material for supercapacitors, which is of great significance to the development of new energy storage materials . Polypyrrole (PPy) is a typical conductive polymer, and its research can be traced back to 1916, when people synthesized PPy powder; at the beginning of the last century, Angeli et al first prepared polypyrrole by oxidizing pyrrole; in 1968, Dallolio et al. Electrochemical method was used to prepare conductive PPy film in aqueous solution; in 1979, Diaz and Kanazawa et al. used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/46H01G11/48
CPCH01G11/24H01G11/30H01G11/46H01G11/48H01G11/86Y02E60/13
Inventor 白明华刘锐王莹于湛王艳戚克振付雅君
Owner SHENYANG NORMAL UNIV
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