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Nano flower-shaped NiCoP supercapacitor electrode material, preparation method and application thereof

A technology of supercapacitors and electrode materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of poor conductivity and structural instability of metal-organic frameworks, and achieve improved conductivity and structural stability. Conductivity, the effect of improving performance

Inactive Publication Date: 2020-07-24
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a nano-flower-like NiCoP supercapacitor electrode material and its preparation method and application to solve the problems of poor conductivity and unstable structure of metal-organic frameworks in the prior art

Method used

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  • Nano flower-shaped NiCoP supercapacitor electrode material, preparation method and application thereof
  • Nano flower-shaped NiCoP supercapacitor electrode material, preparation method and application thereof
  • Nano flower-shaped NiCoP supercapacitor electrode material, preparation method and application thereof

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preparation example Construction

[0031] A kind of preparation method of nano flower shape NiCoP supercapacitor electrode material, comprises the following steps:

[0032] S1. The preparation of the metal-organic framework material comprises the following steps:

[0033] 290mg Ni(NO 3 ) 2 ·6H 2 O, 125mg Co(NO 3 ) 2 ·6H 2 O, 50 mg H 4DOBDC and 1.5g of PVP were uniformly dispersed in 30ml of ethanol, distilled water and DMF with a volume ratio of 1:1:1 and stirred evenly; ℃ for hydrothermal reaction, the reaction time is 12 hours, after the reaction is completed, a turbid solution is obtained; the precipitation is collected by centrifugation at 7000r / min for 3 minutes, and the precipitation is washed with ethanol and distilled water in turn to remove the residual reagents and by-products; finally, at 70 Vacuum drying at ℃ to obtain the Ni / Co-MOFs precursor;

[0034] S2, the synthesis of three-dimensional nano flower-like double metal phosphide NiCoP, comprising the following steps:

[0035] Under an ult...

Embodiment 1

[0039] 290mg Ni(NO 3 ) 2 ·6H 2 O, 125mg Co(NO 3 ) 2 ·6H 2 O, 50 mg H 4 DOBDC and 1.5g PVP were uniformly dispersed in 30ml mixed solution (volume ratio of ethanol:distilled water:DMF was 1:1:1) and stirred evenly. The clarified solution was transferred to an autoclave, and then placed in a blast drying oven for hydrothermal reaction at a reaction temperature of 160° C. for 12 hours. After the reaction was completed, the precipitate was collected from the turbid solution by centrifugation (7000r / min, 3min), and the precipitate was washed with ethanol and distilled water in order to wash away residual reagents and by-products. Finally, the Ni / Co-MOFs precursor, that is, the Ni / Co metal-organic framework material, was obtained by vacuum drying at 70 °C.

Embodiment 2

[0042] NiCoP composites were prepared by low-temperature phosphating of Ni / Co-MOFs in a tube furnace under an ultrapure Ar atmosphere. Ni / Co-MOFs (20mg) precursor and NaH 2 PO 2 2H 2 O points (120mg) were placed in two porcelain boats with NaH 2 PO 2 2H 2 The porcelain boat of O is located upstream of the ultrapure Ar gas flow, and the porcelain boat with Ni / Co-MOFs precursor is located at the upstream of the NaH 2 PO 2 2H 2 Downstream of the porcelain boat of O; then, the Ni / Co-MOFs precursor was heated to 300 °C for 2 h at a rate of 3 °C / min. After cooling to room temperature, a black and black three-dimensional nanoflower-like bimetallic phosphide NiCoP is obtained, which is denoted as NiCoP.

[0043] The nickel mesh is used as the current collector, and the nickel mesh does not provide electrochemical performance. According to the mass ratio, NiCoP: polyvinylidene fluoride: acetylene black = 8:1:1 (where: the amount of NiCoP is 30mg) mixed and transferred to 30ml ...

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Abstract

The invention discloses a nano flower-shaped NiCoP supercapacitor electrode material, a preparation method and an application thereof. The preparation method comprises the steps: taking metal organicframeworks (MOFs) as a precursor; and obtaining a metal phosphide electrode active material derived from the MOFs through low-temperature phosphorization. The nano flower-shaped Ni-Co bimetallic phosphide (NiCoP) prepared by the method is used as an electrode material of a supercapacitor, and has a high specific capacitance (1174F g<-1> at 1A g<-1>) and excellent cycling stability (a specific capacitance is only attenuated by 22.7% after cycling for 5000 circles); an asymmetric supercapacitor assembled by taking the prepared nano flower-shaped NiCoP electrode material and reduced graphene oxide (RGO) as a positive electrode active material and a negative electrode active material has energy density of 38.01 Wh kg<-1> under power density of 800W kg <-1>; and meanwhile, the device has a longcycle life.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a nano flower-shaped NiCoP supercapacitor electrode material and a preparation method and application thereof. Background technique [0002] In recent years, growing concerns about severe energy shortages and environmental pollution have prompted researchers to search for renewable energy sources as an alternative to non-renewable fossil fuels. As an emerging electrochemical energy storage and conversion device, supercapacitors (SCs) have an irreplaceable and unique position to fill the gap between conventional capacitors and rechargeable batteries in terms of energy and power density. Since the properties and energy storage mechanism of SCs largely depend on the electrode active materials, their electrochemical performance can be improved by adjusting the structure and elemental composition of inorganic materials. At present, various electrode active materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/30H01G11/24
CPCH01G11/24H01G11/30H01G11/86Y02E60/13
Inventor 何业增张小龙赵后强陈正隋艳伟戚继球孟庆坤
Owner CHINA UNIV OF MINING & TECH
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