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Core-shell heterostructure self-supporting electrode material, preparation method and application

A self-supporting electrode and heterostructure technology, applied in the fields of hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, etc., can solve the problems of low specific capacity of supercapacitor electrode materials, and achieve excellent electrochemical performance and small charge transfer resistance. , the effect of long cycle life

Active Publication Date: 2019-12-31
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a self-supporting electrode material with a core-shell heterogeneous structure, a preparation method and its application, and solves the technical problem that the specific capacity of the current supercapacitor electrode material is low

Method used

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  • Core-shell heterostructure self-supporting electrode material, preparation method and application
  • Core-shell heterostructure self-supporting electrode material, preparation method and application
  • Core-shell heterostructure self-supporting electrode material, preparation method and application

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preparation example Construction

[0045] On the other hand, an embodiment of the present invention also provides a method for preparing the above-mentioned self-supporting electrode material, comprising the following steps:

[0046] S1, nickel foam cleaning

[0047] S2, prepare P-Ni(OH) 2 / NF: Put the cleaned nickel foam into 30mL containing NaH 2 PO 4 H 2 o 2 In the high-pressure reactor of the solution, hydrothermally react at a certain temperature for a period of time; after the reactor is naturally cooled to room temperature, the product is washed several times with deionized water and ethanol respectively, and vacuum-dried at 50-70°C for 12-36h. Set aside after cooling;

[0048] S3, prepare P-Ni(OH) 2 @Ni-Co LDH: Weigh a certain amount of P-Ni(OH) 2 / NF, with Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O of H 2 o 2 The mixed solution (15wt%) is mixed and reacted in a reactor, and the hydrothermal reaction is performed for a certain period of time. After the reactor is cooled to room temperatu...

Embodiment 1

[0062] (1)P-Ni(OH) 2 / NF sample preparation: first put nickel foam (1cm×3cm) into acetone, hydrochloric acid (3M), absolute ethanol and deionized water, respectively, and ultrasonicate each for 5min to remove oxides and impurities on the surface; then Vacuum dried at 50°C for 48h. Then put the cleaned nickel foam (1cm×3cm) into 30mL containing 2mM NaH 2 PO 4 H 2 o 2 solution (15wt%) in an autoclave for 48 hours at 120°C; after the autoclave was naturally cooled to room temperature, the product was taken out and washed several times with deionized water and ethanol, and dried in vacuum at 50°C for 36 hours , that is, hexagonal prism-shaped P-Ni(OH) grown on nickel foam in situ 2 Micro / nanorod samples.

[0063] (2)P-Ni(OH) 2 Preparation of @Ni-Co LDH / NF samples: P-Ni(OH) 2 / NF samples were placed in a container containing 0.3mMNi(NO 3 ) 2 ·6H 2 O, 5mM Co(NO 3 ) 2 ·6H 2 30 mL of H in O 2 o 2 solution (15wt%) in a reactor, hydrothermally reacted at 150°C for 36h, a...

Embodiment 2

[0065] (1)P-Ni(OH) 2 / NF sample preparation: first put nickel foam (1cm×3cm) into acetone, hydrochloric acid (3M), absolute ethanol and deionized water respectively, and ultrasonicate each for 30min in order to remove oxides and impurities on the surface; then Vacuum dry at 70°C for 12h. Then put the cleaned foam nickel (1cm×3cm) into 30mL containing 50mMNaH2 PO 4 H 2 o 2 solution (15wt%) in an autoclave for 10 h at 220°C; after the autoclave was naturally cooled to room temperature, the product was taken out and washed several times with deionized water and ethanol, and dried in vacuum at 70°C for 12 h , that is, hexagonal prism-shaped P-Ni(OH) grown on nickel foam in situ 2 Micro / nanorod samples.

[0066] (2)P-Ni(OH) 2 Preparation of @Ni-Co LDH / NF samples: P-Ni(OH) 2 / NF samples were placed in a container containing 5mM Ni(NO 3 ) 2 ·6H 2 O, 0.5mM Co(NO 3 ) 2 ·6H 2 30 mL of H in O 2 o 2 solution (15wt%) in a reaction kettle, hydrothermally reacted at 170°C for ...

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Abstract

A method for prepare a core-shell heterostructure self-supporting electrode material, and relates to the field of supercapacitors. The method including a P-Ni(OH)2 micro / nanorod and Ni-Co LDH nanosheets, the Ni-Co LDH nanosheets uniformly wrap in the outer surface of the P-Ni(OH)2 micro / nanorod. The preparation method comprises the following steps: using foam nickel as nickel source and substrate,using H2O2 solution containing NaH2PO4 as oxidant, successfully preparing a P-Ni(OH)2 micro / nanorod array growing in situ; Secondly, P-Ni(OH)2 rod is used as secondary substrate, and Ni-Co LDH nanosheets grow on the rod by a by hydrothermal method, and a three-dimensional composite of a three-dimensional porous P-Ni(OH)2@Ni-Co LDH core-shell heterostructure is prepared. The prepared self-supporting electrode is of a three-dimensional porous core-shell heterostructure and has the advantages of excellent electrochemical performance, abundant resources, simple process and low production cost, and the problem of low specific capacity of supercapacitors is solved.

Description

technical field [0001] The invention belongs to the field of supercapacitor electrode materials, and in particular relates to a core-shell heterostructure self-supporting electrode material, a preparation method and an application thereof. Background technique [0002] With the rapid development of the economy, the consumption of non-renewable energy is increasing, which leads to a series of environmental problems such as energy shortage. In turn, humans are forced to seek clean, environmentally friendly, cheap and efficient renewable energy and new energy conversion and storage technologies. At present, in the field of commonly used energy conversion and storage devices, supercapacitors have the advantages of high power density, high charge and discharge efficiency, long cycle life and high safety, so they have great potential in the fields of portable electronic devices, backup power systems and hybrid vehicles. The wide application prospect has attracted the general atte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/26H01G11/30H01G11/86
CPCH01G11/24H01G11/26H01G11/30H01G11/86Y02E60/13
Inventor 张惠李坤振李士阔黄方志王磊
Owner ANHUI UNIVERSITY
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