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a kind of nico 2 o 4 /Preparation of graphene hydrogel/nickel foam composite electrode and its application in high-performance supercapacitors

A graphene hydrogel, composite electrode technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor current collectors, etc., can solve the problem of unutilized nickel foam gap space, time-consuming, small substrate surface area, etc. problem, to achieve the effect of good electrochemical capacitance performance, fast electron and ion transport

Active Publication Date: 2021-08-27
ZHENGZHOU UNIV
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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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  • a kind of nico <sub>2</sub> o <sub>4</sub> /Preparation of graphene hydrogel/nickel foam composite electrode and its application in high-performance supercapacitors
  • a kind of nico <sub>2</sub> o <sub>4</sub> /Preparation of graphene hydrogel/nickel foam composite electrode and its application in high-performance supercapacitors
  • a kind of nico <sub>2</sub> o <sub>4</sub> /Preparation of graphene hydrogel/nickel foam composite electrode and its application in high-performance supercapacitors

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Embodiment

[0034] A kind of NiCo 2 o 4 The preparation method of / graphene hydrogel / nickel foam composite electrode, as figure 1 shown, including the following steps:

[0035] 1) Preparation of conductive substrate: transfer 5mL of graphene oxide solution with a concentration of 2mg / ml into a 10mL hydrothermal reactor, soak nickel foam in it, seal the reactor, and keep it at 180°C for 12h to obtain a graphene hydrogel / foam nickel (GF) composite material, obtain graphene hydrogel / foam nickel substrate after washing with deionized water;

[0036] Wherein, graphene oxide is prepared by the Hummers method [specific preparation can refer to W.S.Hummers, R.E.Offeman, 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 onthree-dimensional graphene hydrogel as a binder-free supercapacitor electrode with high power and energy densities, RSC Adv.6(2016) 58854-58861], nickel foam (10mm× 10mm×1mm) were wa...

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Abstract

A kind of NiCo 2 o 4 / The preparation method of graphene hydrogel / nickel foam ternary composite electrode comprises the following steps: 1) Preparation of conductive substrate: 1.5-5 mg / mL graphene oxide aqueous solution is placed in a hydrothermal reaction kettle, and the foam Immerse nickel in it, seal the reactor, and react at 120-220°C for 6-12 hours to obtain a graphene hydrogel / nickel foam (GF) composite substrate with a large specific surface area; 2) NiCo is deposited by one-step electrochemical deposition 2 o 4 The nanosheets can be grown on the graphene hydrogel / nickel foam composite substrate skeleton obtained in step 1). The prepared NiCo 2 o 4 / Graphene hydrogel / nickel foam (NGF) ternary composite electrode has a hierarchical open porous structure, which can achieve fast electron and ion transport, and a large electrode-electrolyte interface, making the NGF electrode have good electrochemical capacitance. performance.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to a NiCo 2 o 4 / Graphene hydrogel / nickel foam 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 both traditional dielectric capacitors and batteries, and are widely used in hybrid electric vehicles, portable electronic devices, and industrial energy management. Due to the high power density, long cycle life and easy maintenance of supercapacitors, a lot of research work has been devoted to the development of supercapacitor electrode materials with excellent performance. Among them, NiCo 2 o 4 It is a double-transition metal oxide with a spinel structure. It has the advantages of rich redox states, ultra-high theoretical capacitance, abundant reserves and environmental friendliness. It is considered to b...

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Application Information

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Patent Type & Authority Patents(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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