Preparation method and application of self-supporting transition metal compound-based multilevel structure electrode material

A transition metal and electrode material technology, applied in the field of clean energy preparation, can solve the problems of high cost, poor stability and low activity of electrocatalysts, and achieve the effects of abundant reserves, controllable process, and accelerated mass transfer process.

Inactive Publication Date: 2018-03-16
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a self-supporting transition metal compound-based multi-level structure electrode material preparation method and its application, the method uses carbon cloth as a conductive substrate to prepare graded NiCo 2 S 4 Nanoneedle array and NiCo-LDH nanosheet structure, and have good electrocatalytic OER activity and stability in alkaline solution

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  • Preparation method and application of self-supporting transition metal compound-based multilevel structure electrode material
  • Preparation method and application of self-supporting transition metal compound-based multilevel structure electrode material
  • Preparation method and application of self-supporting transition metal compound-based multilevel structure electrode material

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specific Embodiment approach 1

[0027] Embodiment 1: This embodiment describes a method for preparing a self-supporting transition metal compound-based multi-level structure electrode material, and the steps of the method are as follows:

[0028] Step 1: Mix 1 mmol divalent nickel salt, 2 mmol divalent cobalt salt and 1 g urea with 60 mL ultrapure water to form a clear pale pink solution, and stir for 20 min;

[0029] Step 2: Transfer the light pink solution obtained in Step 1 into a 100mL hydrothermal reactor 1, and then add a piece of carbon cloth with a length×width of (2~4)×(1~2) into the hydrothermal reactor 1, The hydrothermal reaction was carried out at a temperature of 100-120 °C for 4-10 h. After the reaction, the samples were washed with water and ethanol respectively, and the washing was repeated three times respectively to obtain NiCo 2 S 4 Precursors for nanoneedle arrays;

[0030] Step 3: NiCo obtained in Step 2 2 S 4 The precursor of the nanoneedle array was poured into NaS 2 aqueous solu...

specific Embodiment approach 2

[0032] Specific embodiment two: the preparation method of a self-supporting transition metal compound-based multi-level structure electrode material described in specific embodiment one, in step one, the divalent cobalt salt is Co(NO 3 ) 2 •6H 2 O. CoSO 4 •H 2 O, CoCl 2 •6H 2 O or Co(CH 3 COO) 2 • 4H 2 One of O, the divalent nickel salt is Ni (NO 3 ) 2 •6H 2 O, NiSO 4 •H 2 O, NiCl 2 •6H 2 O or Ni(CH 3 COO) 2 • 4H 2 One of O.

specific Embodiment approach 3

[0033] Specific embodiment 3: The preparation method of a self-supporting transition metal compound-based multi-level structure electrode material described in specific embodiment 1, in step 2, the reaction temperature is 120 ° C, and the reaction time is 6 h. This condition can make The obtained product has the best appearance and performance.

[0034] Embodiment 4: The preparation method of a self-supporting transition metal compound-based multi-level structure electrode material described in Embodiment 1, in step 3, the temperature of the hydrothermal reaction is 160 ° C, and the time is 6 h. Repeated experiments have proved that the process conditions are the best process conditions.

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Abstract

The invention relates to a preparation method and application of a self-supporting transition metal compound-based multilevel structure electrode material and belongs to the technical field of clean energy preparation. A flexible carbon cloth is selected as a self-supporting substrate for the reason that the flexible carbon cloth has excellent electrical conductivity, can provide a very large surface area and serve as an efficient current collector; next, a vertically-arranged NiCo2S4 nanoneedle array is synthesized through one step of a hydrothermal reaction, after two steps of the hydrothermal reaction, a NiCo2S4 and carbon cloth composite material is obtained and further used as a substrate of the next step; then the NiCo2S4 and carbon cloth composite material is loaded with an ultrathin NiCo-LDH nanosheet through a simple and convenient electrodepositing method; and after the steps are finished, the self-supporting transition metal compound-based multilevel structure electrode material is successfully prepared. The preparation method is simple in step, the cost is low, environmental friendliness is achieved, the process can be controlled, and the preparation method is suitablefor industrial large-scale production manufacturing; the relevant raw material of the method is free of poison, environmentally friendly, low in price, easy to obtain and rich in reserve volume; and the obtained product is excellent is property and stable in function.

Description

technical field [0001] The invention belongs to the technical field of clean energy preparation, and in particular relates to a preparation method and application of a self-supporting transition metal compound-based multilevel structure electrode material. Background technique [0002] With the increasing global energy demand, the depletion of fossil fuels and the associated negative environmental impacts are driving intensive research on various high-efficiency, low-cost and environmentally clean sustainable energy conversion and storage technologies. As one of the most abundant natural resources, solar energy has attracted a large number of scholars for its development and utilization. One of the most typical utilization methods is solar cells. Solar energy can be converted into electrical energy through solar cells, but the energy cannot be stored. It is well known that solar energy sources are usually discontinuous and variable due to regional or seasonal factors, so we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06B01J27/043
CPCB01J27/043C25B1/04C25B11/04Y02E60/36
Inventor 刘禹萱白羽于洲孙克宁
Owner HARBIN INST OF TECH
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