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Fabrication of NiCo2O4/graphene aerogel/foamed nickel composite electrode and application of high-performance supercapacitor

A graphene hydrogel and composite electrode technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor collectors, etc., can solve the problems of time-consuming, unutilized gap space of nickel foam, and complicated preparation process, etc. problem, to achieve the effect of fast electron and ion transport, good electrochemical capacitive performance

Active Publication Date: 2019-08-27
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these electrode structures, three-dimensional graphene almost just replicates the skeleton structure of nickel foam, and there are still many gap spaces of nickel foam that are not utilized, resulting in the growth of NiCo 2 o 4 The base surface area is small
Moreover, in these works, NiCo 2 o 4 The preparation of the traditional nickel-cobalt double hydroxide precursor is the thermal conversion, the preparation process is complex, time-consuming and high cost

Method used

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  • Fabrication of NiCo2O4/graphene aerogel/foamed nickel composite electrode and application of high-performance supercapacitor
  • Fabrication of NiCo2O4/graphene aerogel/foamed nickel composite electrode and application of high-performance supercapacitor
  • Fabrication of NiCo2O4/graphene aerogel/foamed nickel composite electrode and application of high-performance supercapacitor

Examples

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Effect test

Embodiment 1

[0034] A kind of NiCo 2 O 4 / Graphene hydrogel / foam nickel composite electrode preparation method, such as figure 1 As shown, including the following steps:

[0035] 1) Preparation of conductive substrate: 5mL of graphene oxide solution with a concentration of 2mg / ml was transferred to a 10mL hydrothermal reactor, foamed nickel was immersed in it, the reactor was sealed, and kept at 180°C for 12h to obtain graphene hydrogel / Foam nickel (GF) composite material, washed with deionized water to obtain graphene hydrogel / foam nickel substrate;

[0036] Among them, graphene oxide is prepared by the Hummers method [for specific preparation, please refer to WS Hummers, REOffeman, Preparation of Graphitic Oxide, J. Am. Chem. Soc. 80 (1958) 1339-1342. and S. Gao, L. Zhang, Y.Qiao,P.Dong,S.Cao,Electrodeposition of polyaniline on three-dimensional graphene hydrogel as a binder-free supercapacitor electrode with high power and energy densities,RSC Adv.6(2016)58854-58861], foam nickel (10mm ×10...

Embodiment 2

[0039] NiCo described in this embodiment 2 O 4 The preparation method of / graphene hydrogel / foamed nickel composite electrode is different from Example 1 in that the concentration of the graphene oxide aqueous solution is 1.5 mg / mL, the reactor is sealed, and the graphene hydrogel is obtained by keeping it at 220°C for 6 hours. Glue / foam nickel (GF) composite material. The rest are the same as in Example 1.

Embodiment 3

[0041] NiCo described in this embodiment 2 O 4 The preparation method of / graphene hydrogel / foamed nickel composite electrode is different from Example 1 in that the concentration of the graphene oxide aqueous solution is 5.0 mg / mL, the reactor is sealed, and the graphene hydrogel is obtained by keeping it at 120°C for 12 hours. Glue / foam nickel (GF) composite material. The rest are the same as in Example 1.

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Abstract

A fabrication method of a NiCo2O4 / graphene aerogel / foamed nickel composite electrode comprises the following steps of 1) fabricating a conductive substrate, in which 1.5-5mg / mL graphene oxide aqueoussolution is placed in a hydrothermal reaction kettle, foamed nickel is immersed in the graphene oxide aqueous solution, the reaction kettle is sealed, and reaction is performed for 6-12 hours at 120-220 DEG C to obtain a graphene aerogel / foamed nickel (NGF) composite substrate with relatively large specific area; and 2) growing a NiCo2O4 nanosheet onto the graphene aerogel / foamed nickel (NGF) composite substrate obtained in the step 1) by one-step electrochemical deposition. The fabricated NiCo2O4 / graphene aerogel / foamed nickel (NGF) ternary composite electrode has a hierarchical opening porous structure, rapid electron and ion transmission can be achieved, a large electrode-electrolyte acting interface can be achieved, so that the NGF electrode has favorable electrochemical capacitance performance.

Description

Technical field [0001] The invention belongs to the technical field of material preparation, and specifically relates to a NiCo 2 O 4 / Graphene hydrogel / foam nickel composite electrode and its preparation method and high-performance supercapacitor application. Background technique [0002] As an important branch of energy storage devices, supercapacitors have the advantages of traditional dielectric capacitors and batteries, and are widely used in hybrid electric vehicles, portable electronic devices, and industrial energy management. Because supercapacitors have the characteristics of high power density, long cycle life and convenient maintenance, a lot of research work is devoted to the development of supercapacitor electrode materials with excellent performance. Among them, NiCo 2 O 4 It is a kind of double transition metal oxide with spinel structure. It has the advantages of rich redox state, ultra-high theoretical capacitance, abundant reserves and environmental friendlines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/26H01G11/24H01G11/68H01G11/70C01G51/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G51/42H01G11/24H01G11/26H01G11/46H01G11/68H01G11/70H01G11/86Y02E60/13
Inventor 张丽曹少魁冯含芳徐慎刚刘应良石军
Owner ZHENGZHOU UNIV
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