Alkali cobalt carbonate@nickel cobalt MOF core-shell array composite material, preparation and application thereof

A composite material, cobalt carbonate technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of poor cycle stability and low energy density of capacitors, and achieve short time consumption and abundant redox reaction sites , good reproducibility

Inactive Publication Date: 2021-11-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a Co 2 (CO 3 )(OH) 2 As the core, NiCo-MOF is the composite nanomaterial of the shell. The core-shell composite material can be directly used as the electrode material of the supercapacitor, and the highest specific capacitance can reach 3232F g -1 , is expected to become a new supercapacitor electrode material to overcome the disadvantages of low energy density and poor cycle stability of traditional capacitors

Method used

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  • Alkali cobalt carbonate@nickel cobalt MOF core-shell array composite material, preparation and application thereof
  • Alkali cobalt carbonate@nickel cobalt MOF core-shell array composite material, preparation and application thereof
  • Alkali cobalt carbonate@nickel cobalt MOF core-shell array composite material, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Co 2 (CO 3 ) (OH) 2 @ MOF-1 was prepared and applied to electrode materials for supercapacitors

[0041] The preparation steps of:

[0042] First Weigh Co (NO 3 ) 2 · 6H 2 O (0.5821g, 2mmol), urea (0.6006g, 10mmol), was dissolved in 40mL of deionized water under magnetic stirring action until a deep pink homogeneous solution. The solution was poured into 50mL configured polytetrafluoroethylene autoclave high pressure water, have taken a good pre-drying of the size of 1cm × 4cm foamed nickel autoclave into water, water is sealed in the autoclave under the action of 120 ℃ heated 4h. After the autoclave was water to be cooled to room temperature, remove the nickel foam was rinsed with ethanol and dried in vacuo to obtain Co 2 (CO 3 ) (OH) 2 Precursor.

[0043] Under magnetic stirring Co (NO 3 ) 2 · 6H 2 O (0.0218g, 0.075mmol), and Ni (NO 3 ) 2 · 6H 2 O (0.0218g, 0.075mmol) was dissolved in 30mL of methanol. 10mL of methanol was then added dropwise a solution contain...

Embodiment 2

[0052] Example 2: CO 2 (Co 3 (OH) 2 Preparation of @ MOF-2 and Its Application to Super Capacitor Electrode Materials

[0053] The preparation steps are:

[0054] First weigh CO (NO 3 ) 2 · 6h 2 O (0.5821 g, 2 mmol), urea (0.6006 g, 10 mmol), dissolved in 40 mL of deionized water under the action of magnetic stirring until a uniform solution of deep pink is obtained. Pour the configuration solution into a 50 ml of polytetrafluoroethylene high-pressure hydrophane, take a pre-pretreated dry 1 cm × 4 cm size foam nickel placed in a hydrothermal kettle, and the hydrothermal kettle is sealed Heating at 120 ° C for 4 h. After the water is reduced to room temperature, remove the foam nickel and rinse with ethanol and dry it, it gives CO 2 (Co 3 (OH) 2 Precursor.

[0055] Co (NO) with magnetic stirring 3 ) 2 · 6h 2 O (0.0291G, 0.1mmol) and Ni (NO 3 ) 2 · 6h 2 O (0.0291 g, 0.1 mmol) was dissolved in 30 ml of methanol. A 10 ml of methanol (0.0498 g, 0.3 mmol) was then added dropwise thereto...

Embodiment 3

[0060] Example 3: CO 2 (Co 3 (OH) 2 Preparation of @ MOF-3 and Its Application to Super Capacitor Electrode Materials

[0061] The preparation steps are:

[0062] First weigh CO (NO 3 ) 2 · 6h 2 O (0.5821 g, 2 mmol), urea (0.6006 g, 10 mmol), dissolved in 40 mL of deionized water under the action of magnetic stirring until a uniform solution of deep pink is obtained. Pour the configuration solution into a 50 ml of polytetrafluoroethylene high-pressure hydrophane, take a pre-pretreated dry 1 cm × 4 cm size foam nickel placed in a hydrothermal kettle, and the hydrothermal kettle is sealed Heating at 120 ° C for 4 h. After the water is reduced to room temperature, remove the foam nickel and rinse with ethanol and dry it, it gives CO 2 (Co 3(OH) 2 Precursor.

[0063] Co (NO) with magnetic stirring 3 ) 2 · 6h 2 O (0.0146g, 0.05mmol) and Ni (NO 3 ) 2 · 6h 2 O (0.0145 g, 0.05 mmol) was dissolved in 30 ml of methanol. Then 10 ml of dimethylimidazole (0.00246 g, 0.3 mmol) of methanol solut...

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Abstract

The invention provides a alkali cobalt carbonate@nickel cobalt MOF core-shell array composite material, which is prepared by the following steps: by taking a cobalt salt and urea as reaction raw materials, deionized water as a solvent and foamed nickel as a current collector substrate, growing Co2(CO3)(OH)2 nanowires on the foamed nickel substrate in situ through a hydrothermal method; and in order to restrain the disadvantage that the electrochemical performance is reduced due to the fact that the morphology of Co2(CO3)(OH)2 is prone to collapse in the charging and discharging process, covering the surface of the nanowire with a layer of NiCo-MOF nanosheets through secondary hydrothermal treatment so as to construct the core-shell array composite nanomaterial with Co2(CO3)(OH)2 as the core and NiCo-MOF as the shell. According to the invention, the composite material electrode shows extremely high specific capacitance performance, the highest specific capacitance reaches 3232F g<-1>, and the composite material is a novel high-performance supercapacitor electrode material.

Description

Technical field [0001] Application of the electrode material of the present invention belongs to the functional material and nano-electrochemical energy storage structure technical field, particularly relates to a composite material and a core-shell structure array with the MOF basic carbonate material, as well as supercapacitors . Background technique [0002] Ultracapacitors as the energy potential of portable electronic devices, backup power and power equipment, storage equipment has been attracting researchers to their vision. Research focus on the super capacitor electrode material is focused on the pseudocapacitive material and a battery-type material, a conductive material and a carbon-based comparative polymer, pseudocapacitive material and cell-type material has a higher ratio of theoretical capacity. Pseudocapacitive material (e.g., MnO 2 ) And battery materials (such as Co 3 S 4 , NiO) The fundamental difference is that a continuous oxidation potential range of the red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/30
CPCH01G11/86H01G11/30Y02E60/13
Inventor 郑灵霞彭佳喜郑华均杨鹏举
Owner ZHEJIANG UNIV OF TECH
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