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VN/Ni3P/Ni three-phase composite electrocatalyst as well as preparation method and application thereof

An electrocatalyst and reaction technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of single-phase catalyst activity limitation, complex preparation process, etc., and achieve low cost, high reaction yield, and environment-friendly effects

Pending Publication Date: 2022-03-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of limited single-phase catalyst activity and complicated preparation process in the prior art, the present invention provides a VN / Ni 3 P / Ni three-phase composite electrocatalyst and its preparation method and application, the method is easy to operate, the conditions are mild, the process is easy to control, and the three can be fully combined to give full play to the synergistic effect, and the obtained product shows excellent electrocatalytic hydrogen production performance

Method used

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  • VN/Ni3P/Ni three-phase composite electrocatalyst as well as preparation method and application thereof
  • VN/Ni3P/Ni three-phase composite electrocatalyst as well as preparation method and application thereof
  • VN/Ni3P/Ni three-phase composite electrocatalyst as well as preparation method and application thereof

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preparation example Construction

[0030] The invention provides a VN / Ni 3 The preparation method of P / Ni three-phase composite electrocatalyst specifically comprises the following steps:

[0031] Step 1: Dissolve nickel source, urea and ammonium fluoride in water at a molar ratio of (2-4):(23-26):(8-11), stir for 15-20 minutes to obtain a uniform solution, and then transfer to hydrothermal Place the still in an oven at 115-125°C to react for 15.5-16.5 hours to form a precipitate; the source of nickel is any one or more of nickel nitrate hexahydrate, nickel acetate hexahydrate and nickel chloride hexahydrate; The concentration is 0.044-0.058mol / L, and the filling ratio of the hydrothermal reactor is 70-80%;

[0032] Step 2: After the reaction is completed and cooled naturally, the product is collected by suction filtration, washed alternately with water and ethanol for at least three times, and dried in a vacuum oven at 60°C for 6 hours to obtain a nickel hydroxide nanosheet precursor. Namely nickel hydroxide...

Embodiment 1

[0039] Step 1: Dissolve nickel nitrate hexahydrate, urea and ammonium fluoride in water at a molar ratio of 2:24:8, the concentration of nickel source is 0.045mol / L, the filling ratio of the hydrothermal reactor is 70%, and stir for 15 minutes A homogeneous solution was obtained, then transferred to a hydrothermal kettle and placed in an oven at 115°C for 15.5 hours to generate a precipitate;

[0040] Step 2: After the reaction is completed and cooled naturally, the product is collected by suction filtration, washed alternately with water and ethanol for at least three times, and dried in a vacuum oven at 60°C for 6 hours to obtain a nickel hydroxide nanosheet precursor;

[0041] Step 3: Weigh the nickel-containing hydroxide precursor, dicyandiamide, sodium hypophosphite and vanadium chloride with a mass ratio of 2:4:9:0.5, transfer the weighed sodium hypophosphite to a large porcelain boat and Concentrate on one end, and place the rest in an agate mortar for mechanical grindi...

Embodiment 2

[0044] Step 1: Dissolve nickel chloride hexahydrate, urea and ammonium fluoride in water at a molar ratio of 3:25:10, the concentration of nickel source is 0.050mol / L, the filling ratio of the hydrothermal reactor is 75%, stir A homogeneous solution was obtained in 18 minutes, then transferred to a hydrothermal kettle and placed in an oven at 120°C for 16 hours to generate a precipitate;

[0045] Step 2: After the reaction is completed and cooled naturally, the product is collected by suction filtration, washed alternately with water and ethanol for at least three times, and dried in a vacuum oven at 60°C for 6.0 hours to obtain a nickel hydroxide nanosheet precursor ;

[0046] Step 3: Weigh the nickel-containing hydroxide precursor, dicyandiamide, sodium hypophosphite and vanadium chloride with a mass ratio of 3:5:10:1, transfer the weighed sodium hypophosphite into a large porcelain boat and Concentrate on one end, and place the rest in an agate mortar for mechanical grindi...

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Abstract

The invention discloses a VN / Ni3P / Ni three-phase composite electrocatalyst and a preparation method and application thereof.The preparation method adopts a hydrothermal method and subsequent heat treatment and comprises the steps that firstly, a nickel source, urea and ammonium fluoride are dissolved in water to obtain a uniform solution, then a hydrothermal reaction is conducted, after the reaction is finished and cooled, suction filtration and collection are conducted on a product, and cleaning and drying are conducted to obtain the VN / Ni3P / Ni three-phase composite electrocatalyst. A nickel-containing hydroxide precursor is obtained; and then weighing the nickel-containing hydroxide precursor, dicyandiamide, sodium hypophosphite and vanadium chloride, and carrying out high-temperature vacuum calcination reaction in an inert atmosphere to obtain the VN / Ni3P / Ni three-phase composite electrocatalyst. The obtained material has excellent electrical conductivity and chemical stability and has great development prospects as an electrocatalyst, and the whole technological process is simple, convenient and easy to control, high in reaction yield, low in cost, environmentally friendly, free of large-scale equipment and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of synthesis of electrocatalyst materials, in particular to a VN / Ni 3 P / Ni three-phase composite electrocatalyst and its preparation method and application. Background technique [0002] Nowadays, energy shortage and environmental pollution are seriously restricting the development of human society, and it is imminent to find new alternative energy sources. In recent years, hydrogen energy has been widely favored due to its unique advantages and abundant resources. The green and environmentally friendly electrolysis water technology stands out from many hydrogen production methods and is considered to be a promising green hydrogen production technology path. Since the use of catalysts can significantly reduce the chemical reaction barrier to accelerate the efficiency of water splitting hydrogen production, and noble metal catalysts are currently the most efficient catalytic materials and cannot be put into ...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B1/04B22F9/22B82Y30/00B82Y40/00
CPCC25B11/091C25B1/04B22F9/22B82Y30/00B82Y40/00
Inventor 冯亮亮付常乐曹丽云黄剑锋冯永强尹红艳
Owner SHAANXI UNIV OF SCI & TECH
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