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Graphene/nitrogen doped carbon/nickel/nickel oxide composite material preparation method

A nitrogen-doped carbon, composite material technology, applied in the manufacture of hybrid/electric double layer capacitors, nanotechnology for materials and surface science, hybrid capacitor electrodes, etc., can solve the problem of many process preparation steps and low specific capacitance of composites , time-consuming and other problems, to achieve the effect of broad application prospects, high specific capacitance, and reliable principle

Active Publication Date: 2018-12-07
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcoming that existing synthetic technology exists, propose a kind of three-dimensional structure graphene / nitrogen-doped carbon / nickel / nickel oxide nano-composite material preparation method, solve process preparation step is many, time-consuming long, compound specific capacitance Low problems that are not conducive to material application, can easily and efficiently prepare composite electrode materials for supercapacitors

Method used

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  • Graphene/nitrogen doped carbon/nickel/nickel oxide composite material preparation method
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  • Graphene/nitrogen doped carbon/nickel/nickel oxide composite material preparation method

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Embodiment 1

[0030] Get 30mL polyacrylamide mother liquor (5wt%), add 45mL deionized water to dilute and form the homogeneous solution that concentration is 2%, drop 4.5mL graphene oxide mother liquor (10mg / mL) under vigorous stirring state, control the graphene oxide in the solution The alkene concentration was 0.6 mg / mL. Add 464.4mg resorcinol, 1.26mL formaldehyde (37wt%), 2.67g NiCl to the solution 2 ·6H 2 O and 300 μL of hydrochloric acid (3mol / L), and add 0.18 g of ascorbic acid as a reducing agent for graphene oxide. After the mixture solution was stirred evenly, it was transferred to a 100 mL polytetrafluoroethylene-lined autoclave, and subjected to a hydrothermal reaction at 130 °C for 15 h to obtain a reduced graphene oxide / cross-linked polyacrylamide / nickel chloride hydrogel. The gel was quickly frozen with liquid nitrogen, and dried in a freeze dryer for 24 hours (temperature -50°C, vacuum degree 8Pa) to obtain a reduced graphene oxide / cross-linked polyacrylamide / nickel chlori...

Embodiment 2

[0032] Get 30mL of polyacrylamide mother liquor (5wt%), add 45mL of deionized water to dilute and form a uniform solution with a concentration of 2%, add 6.0mL of graphene oxide mother liquor (10mg / mL) dropwise under vigorous stirring, and control the amount of graphite oxide in the solution. The alkene concentration was 0.8 mg / mL. Add 464.4mg resorcinol, 1.26mL formaldehyde (37wt%), 2.67g NiCl to the solution 2 ·6H 2 O and 300 μL of hydrochloric acid (3mol / L), and add 0.24 g of ascorbic acid as a reducing agent for graphene oxide. After the mixture solution was stirred evenly, it was transferred to a 100 mL polytetrafluoroethylene-lined autoclave, and subjected to a hydrothermal reaction at 130 °C for 15 h to obtain a reduced graphene oxide / cross-linked polyacrylamide / nickel chloride hydrogel. The gel was quickly frozen with liquid nitrogen, and dried in a freeze dryer for 24 hours (temperature -50°C, vacuum degree 8Pa) to obtain a reduced graphene oxide / cross-linked polyac...

Embodiment 3

[0034] Get 30mL of polyacrylamide mother liquor (5wt%), add 45mL of deionized water to dilute and form a uniform solution with a concentration of 2%, add 7.5mL of graphene oxide mother liquor (10mg / mL) dropwise under vigorous stirring, and control the amount of graphite oxide in the solution. The alkene concentration was 1.0 mg / mL. Add 464.4mg resorcinol, 1.26mL formaldehyde (37wt%), 2.67g NiCl to the solution 2 ·6H 2 O and 300 μL of hydrochloric acid (3mol / L), and add 0.30 g of ascorbic acid as a reducing agent for graphene oxide. After the mixture solution was stirred evenly, it was transferred to a 100 mL polytetrafluoroethylene-lined autoclave, and subjected to a hydrothermal reaction at 130 °C for 15 h to obtain a reduced graphene oxide / cross-linked polyacrylamide / nickel chloride hydrogel. The gel was quickly frozen with liquid nitrogen, and dried in a freeze dryer for 24 hours (temperature -50°C, vacuum degree 8Pa) to obtain a reduced graphene oxide / cross-linked polyac...

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Abstract

The invention belongs to the energy storage material technical field, and relates to a graphene / nitrogen doped carbon / nickel / nickel oxide composite material preparation method; the method is applied to a super capacitor electrode material preparation occasion, and solves the problems that an existing process is complex in preparation steps, long in time consumption, low in compound specific capacitance, and hard in material applications. The method comprises the following steps: employing a reduction oxidation graphene / crosslinking polyacrylamide / nickel salt aerogel as a precursor; calcining same to realize carbon material in situ nitrogen doping, carbon hot reduction, and catalysis graphitization; and compositing same with the reduction oxidation graphene to form a 3D structure graphene / nitrogen doped carbon / nickel / nickel oxide quaternary nano composite material. The preparation process is simple, and reliable in principles; the composite material can serve as the super capacitor electrode material, is low in equivalent resistance, low in interface charge transfer resistance and Warburg impedance, high in product specific capacitance, excellent in electrochemistry performance, andhas excellent economic benefits and application prospects.

Description

Technical field: [0001] The invention belongs to the technical field of energy storage materials and relates to a method for preparing a graphene / nitrogen-doped carbon / nickel / nickel oxide composite material (RGO / NPGC / Ni / NiO). The product can be used in the preparation of supercapacitor electrode materials. Background technique: [0002] Supercapacitors have the advantages of high power density, fast charge and discharge, long cycle life, high efficiency, cleanliness, and safety. According to the energy storage mechanism, supercapacitors can be divided into electric double layer capacitors and Faraday pseudocapacitors. Electric double layer capacitors use the interface electric double layer between the electrode and the electrolyte to store energy, and what happens is a physical adsorption process. It usually uses activated carbon, graphene, etc. with a high specific surface area as the electrode material. The Faraday pseudocapacitor generates a higher specific capacity thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/30H01G11/46H01G11/24B82Y30/00
CPCH01G11/24H01G11/30H01G11/46H01G11/86B82Y30/00Y02E60/13
Inventor 赵继宽李尧
Owner QINGDAO UNIV OF SCI & TECH
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