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nicop/cop/cose@nc catalyst and preparation method

An electrocatalyst, nitrogen doping technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as poor performance, achieve fast electron transfer, good stability, overpotential low effect

Active Publication Date: 2022-07-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst has good HER activity, its performance is not outstanding at high current density, for example, its LSV curve shows that at 100 mA cm -2 When the catalyst overpotential exceeds 250 mV

Method used

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  • nicop/cop/cose@nc catalyst and preparation method
  • nicop/cop/cose@nc catalyst and preparation method
  • nicop/cop/cose@nc catalyst and preparation method

Examples

Experimental program
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Effect test

reference example 1

[0064] The nickel foam sheet is pretreated before use: cut the nickel foam sheet into 2×1 cm 2, then placed in a concentrated nitric acid solution with a mass concentration of 95%, ultrasonically treated for 15 min at 30 kHz, and then ultrasonically cleaned with water and ethanol for 6 times at 30 kHz, and vacuum dried at 50 ℃, -0.05MPa for 4h , get foam nickel sheet 1.

reference example 2

[0066] The nickel foam sheet is pretreated before use: cut the nickel foam sheet into 2×1 cm 2 , and then placed in a concentrated hydrochloric acid solution with a mass concentration of 36%, ultrasonically treated for 5 minutes at 20 kHz, then ultrasonically cleaned with water and ethanol for 8 times at 20 kHz, and vacuum dried at 40 ℃ and -0.08MPa for 5h , get foam nickel sheet 2.

reference example 3

[0068] The nickel foam sheet is pretreated before use: cut the nickel foam sheet into 2×1 cm 2 , and then placed in a concentrated nitric acid solution with a mass concentration of 95%, ultrasonically treated for 3 minutes at 40 kHz, and then ultrasonically cleaned with water and ethanol for 4 times at 40 kHz, and vacuum dried at 60 ° C and -0.03 MPa for 3 hours. , get foam nickel sheet 3.

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Abstract

NiCoP / CoP / CoSe@NC catalyst and preparation method, the catalyst is composed of nitrogen-doped nanofibers supported on nickel foam; the nitrogen-doped nanofibers are composed of a core and a shell, and the core includes NiCoP, CoP and CoSe In the heterostructure formed with CoP, the shell layer is amorphous nitrogen-doped carbon coated on the outer layer of the heterostructure. The method is as follows: (1) adding cobalt source, urea and morphological agent into water, stirring, putting into foam nickel sheet, sealing, hydrothermally reacting, cleaning, and drying to obtain a supported precursor foam nickel sheet; The selenium source, the phosphorus source and the loaded precursor nickel foam sheet are respectively placed on the upper, middle and lower tuyere of the quartz boat. Under a protective atmosphere, the temperature is raised, reacted, cooled, washed, and dried. The catalyst of the invention has excellent HER performance, low overpotential, good stability, small impedance value and fast electron transfer under alkaline electrolyte and high current density. The method of the invention is simple and low in cost.

Description

technical field [0001] The invention relates to an NC catalyst and a preparation method, in particular to a NiCoP / CoP / CoSe@NC catalyst and a preparation method. Background technique [0002] HER under alkaline environment is one of the main energy conversion processes in water electrolysis technology, and efficient and low-cost catalysts are not only of industrial value, but also of great significance for studying electrocatalytic reactions on cathode electrodes. Compared with acidic media, the HER reaction kinetics in alkaline media is slower, the sensitivity to catalyst surface structure is higher, and the reaction mechanism is unclear, making the development of alkaline HER catalysts more difficult. [0003] Currently, commercial HER catalysts are noble metal Pt-based catalysts, such as Pt / C catalysts. It is well known that the earth reserves of precious metal Pt are very low, which limits its large-scale application. Therefore, many non-precious metal HER catalysts have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02B01J35/06C25B1/04C25B11/061C25B11/091B01J35/00
CPCB01J27/24C25B1/04B01J35/33B01J35/396B01J35/40B01J35/58Y02E60/36
Inventor 雷永鹏刘毅熊翔
Owner CENT SOUTH UNIV
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