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Hydrogen-evolution electrocatalytic material and preparation method thereof

An electrocatalytic material and hydrogen evolution technology, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve problems such as poor stability, low catalytic efficiency, and few active sites, and achieve high stability and catalytic activity High, environmentally friendly effect

Active Publication Date: 2018-08-10
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a hydrogen evolution electrocatalytic material and its preparation method, which can effectively solve the problems of existing hydrogen evolution electrocatalytic materials with few active sites, low catalytic efficiency and poor stability

Method used

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  • Hydrogen-evolution electrocatalytic material and preparation method thereof
  • Hydrogen-evolution electrocatalytic material and preparation method thereof
  • Hydrogen-evolution electrocatalytic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The prepared spherical metallic nickel powder was repeatedly washed and dried with distilled water, and the prepared spherical metallic nickel powder was sieved for microstructure analysis. The average particle size was selected to be 10 μm, and the average specific surface area was 61 μm. 2 / g, the spherical metallic nickel powder with an average pore size distribution of 30nm is used as the nickel reaction source, figure 1 It is a scanning electron micrograph of the prepared spherical metallic nickel powder, as shown in the figure, the spherical metallic nickel powder adopted in the present invention has high sphericity, uniform mesopores, and good molding rate. The obtained spherical metal nickel powder and the purchased red phosphorus are placed in an agate crucible according to the molar ratio Ni:P=0.2, and are ground evenly, then in the nickel-phosphorus mixture, adding a mass ratio of 3% graphene is mixed evenly, and then poured Put it into the mold of the tablet...

Embodiment 2

[0043] The prepared spherical nickel metal powder was repeatedly washed and dried with distilled water, and the average particle size was 30 μm, and the average specific surface area was 61 m 2 / g, the average pore size distribution is that the spherical metal nickel powder of 30nm and red phosphorus are mixed and ground uniformly according to the molar ratio Ni:P=0.3, then in this nickel-phosphorus mixture, adding mass ratio is 4% graphene and mixed uniformly, then carry out For tableting treatment, the pressure was 15MPa, and the storage time was 15s. The obtained tableted sample was placed in a vacuum drying oven with a vacuum degree of -0.1MPa, dried at 70°C for 1.2h, and then naturally cooled to room temperature. Place the compressed sample in the middle of a nitrogen atmosphere tube furnace, close the channel of the tube furnace and clean it with nitrogen for 20 minutes, then under the protection of argon, the argon flow rate is 10mL / min, the temperature is programmed to ...

Embodiment 3

[0045] The prepared spherical nickel metal powder was repeatedly washed and dried with distilled water, and the average particle size was 45 μm, and the average specific surface area was 68 m 2 / g, the average pore size distribution is that the spherical metal nickel powder of 30nm and the red phosphorus are mixed and ground according to the molar ratio Ni:P=0.5, then in this nickel-phosphorus mixture, adding mass ratio is 5% graphene and mixed evenly, then carry out For tableting treatment, the pressure was 18MPa, and the storage time was 20s. The obtained tableted sample was placed in a vacuum drying oven with a vacuum degree of -0.1MPa, dried at 80°C for 1.4h, and then naturally cooled to room temperature. Place the compressed sample in the middle of a nitrogen atmosphere tube furnace, close the channel of the tube furnace and clean it with nitrogen for 25 minutes, then under the protection of argon, the argon flow rate is 20mL / min, the temperature is programmed to 600 ° C f...

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Abstract

The invention provides a hydrogen-evolution electrocatalytic material and a preparation method thereof, belonging to the technical field of preparation of electrocatalytic materials. The preparation method comprises the following steps: A, subjecting prepared spherical metal nickel powder to repeated ultrasonic washing with distilled water, and carrying out drying; B, subjecting the spherical metal nickel powder obtained in the step A and red phosphorus to grinding and mixing according to a Ni-to-P mol ratio of 0.2 to 2.5, then adding graphene or carbon nanotubes with a mass ratio of 3 to 30%,carrying out uniform mixing, subjecting the uniformly-mixed mixture to tabletting treatment through a tablet press, then placing a pressed circular sheet sample into a vacuum drying box, and carryingout drying treatment; and C, placing the circular sheet obtained by uniformly mixing the spherical metal nickel powder, the red phosphorus and the graphene or the carbon nanotubes in the step B intoa tubular furnace, then carrying out programmed heating and phosphorization treatment under the condition of inert gas protection, and carrying out cooling with the furnace to room treatment so as toobtain a three-dimensional porous self-supported type nickel phosphide hydrogen-evolution electrocatalytic material.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by electrocatalytic water splitting. Background technique [0002] In recent years, with the rapid economic development, increasing global energy demand and accompanying climate change and environmental issues are driving scientists to seek sustainable and environmentally friendly alternative energy sources to replace depleted fossil fuels. Electrochemical water splitting driven by renewable energy (e.g., solar, wind) is a promising method to generate clean and high-purity hydrogen (H2) fuel and has been proposed as a "core clean energy technology". As an efficient and clean secondary energy carrier, hydrogen is known as the oil of the future. But at present, only about 20% of the hydrogen in the world comes from water splitting. The main reason is that water splitting relies too much on rare metals as catalytic materials, such as Pt, Ru, Ir, etc. Noble metal catalysts are hindered f...

Claims

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Application Information

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IPC IPC(8): B01J27/185C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/1853B01J35/33Y02E60/36
Inventor 徐轶兰伟陈亚
Owner SOUTHWEST JIAOTONG UNIV
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