A transition metal phosphide MxPy oxygen reduction and hydrogen evolution bifunctional catalyst and preparation method and application thereof

A bifunctional catalyst and transition metal technology, applied in the field of electrochemical catalysis, can solve the problems of large grain size, small specific surface area, and weak catalytic activity, and achieve small grain size, large specific surface area, and high HER catalytic performance Effect

Inactive Publication Date: 2019-01-01
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and deficiencies of the preparation method of transition metal phosphides in the prior art, such as harsh conditions, low product purity, large grain size, small specific surface area, and weak catalytic activity, and provide a transition metal phosphide M x P y Preparation method of oxygen reduction and hydrogen evolution bifunctional catalyst

Method used

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  • A transition metal phosphide MxPy oxygen reduction and hydrogen evolution bifunctional catalyst and preparation method and application thereof
  • A transition metal phosphide MxPy oxygen reduction and hydrogen evolution bifunctional catalyst and preparation method and application thereof
  • A transition metal phosphide MxPy oxygen reduction and hydrogen evolution bifunctional catalyst and preparation method and application thereof

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Embodiment 1

[0040] This embodiment provides several transition metal phosphides M x P y (MnP, FeP, CoP and Ni 5 P 4 ) Oxygen reduction and hydrogen evolution bifunctional catalyst, prepared by the following method.

[0041]Select metal elements Mn, Fe, Co with a particle size of 300nm, red phosphorus powder at a metering ratio of 1:1, Ni and red phosphorus powder at a metering ratio of 5:4 and mix them into a zirconia ball mill tank, add zirconia The mass ratio of the ball to the mixed powder is 15:1. Under the condition of inert gas, seal the zirconia ball mill jar, and perform high-energy ball milling at a speed of 400rpm for 12h to preliminarily prepare transition metal phosphides MnP, FeP, CoP and Ni respectively. 5 P 4 Material;

[0042] Then the MnP, FeP, CoP and Ni synthesized initially in the previous step 5 P 4 In the material, the ratio of the mass of the isopropanol dispersion to the mass of the powder is 2:1, wet ball milling at a speed of 100rpm for 2h, and then drying...

Embodiment 2

[0049] This embodiment provides several transition metal phosphides M x P y (MnP, FeP, CoP and Ni 5 P 4 ) Oxygen reduction and hydrogen evolution bifunctional catalyst, prepared by the following method.

[0050] Select metal elements Mn, Fe, Co with a particle size of 100nm, red phosphorus powder at a metering ratio of 1:1, Ni and red phosphorus powder at a metering ratio of 5:4 and mix them into a zirconia ball mill tank, add zirconia The mass ratio of the ball to the mixed powder is 10:1. Under the condition of inert gas, seal the zirconia ball mill jar, and carry out high-energy ball milling at a speed of 300 rpm for 15 hours to preliminarily prepare transition metal phosphides MnP, FeP, CoP and Ni respectively. 5 P 4 Material;

[0051] Then the MnP, FeP, CoP and Ni synthesized initially in the previous step 5 P 4 In the material, the ratio of the mass of the added aqueous dispersion to the mass of the powder is 3:1, wet ball milling at a speed of 150rpm for 3h, and ...

Embodiment 3

[0054] This embodiment provides several transition metal phosphides M x P y (MnP, FeP, CoP and Ni 5 P 4 ) Oxygen reduction and hydrogen evolution bifunctional catalyst, prepared by the following method.

[0055] Select metal elements Mn, Fe, Co with a particle size of 30nm, red phosphorus powder at a metering ratio of 1:1, Ni and red phosphorus powder at a metering ratio of 5:4 and mix them into a zirconia ball mill tank, add zirconia The mass ratio of the ball to the mixed powder is 5:1. Under the condition of inert gas, seal the zirconia ball mill jar, and perform high-energy ball milling at a speed of 200 rpm for 18 hours to preliminarily prepare transition metal phosphides MnP, FeP, CoP and Ni respectively. 5 P 4 Material;

[0056] Then the MnP, FeP, CoP and Ni synthesized initially in the previous step 5 P 4 In the material, the ratio of the mass of the ethanol dispersion to the mass of the powder is 4:1, wet ball milling at a speed of 100rpm for 4h, and then dryin...

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Abstract

The invention relates to a transition metal phosphide MxPy oxygen reduction and hydrogen evolution bifunctional catalyst and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing transition metal elementary substance M and red phosphorus powder, and ball milling to obtain transition metal phosphide MxPy material in an inert atmosphere; S2, adding a dispersing agent into the MxPy material, ball milling, and drying to obtain a transition metal phosphide MxPy bifunctional catalyst for oxygen reduction and hydrogen evolution. A metal transition phosphide with high purity, small crystal grain size and large specific surface area is prepared by a ball milling method, and has excellent ORR and HER catalytic performance and high stability, and can be widely applied to metal-air batteries, fuel cells or electrocatalytic hydrolysis to produce hydrogen; and the preparation method provided by the invention is simple and quick, the raw materials are cheap and easy to obtain and pollution-free, the production cost is low, and the requirement of industrialized mass production is met.

Description

technical field [0001] The invention belongs to the field of electrochemical catalysis, in particular to a transition metal phosphide M x P y Oxygen reduction and hydrogen evolution bifunctional catalyst and its preparation method and application. Background technique [0002] With the rapid development of the world, energy demand has entered a high-speed growth. Traditional fossil energy is facing a major crisis of depletion, and the use of fossil energy has brought about a series of environmental problems. It is particularly important to develop sustainable new energy. Hydrogen is one of the ideal clean energy sources and has been widely valued by countries all over the world. At present, hydrogen production by electrolysis of water is an extremely important and promising method for hydrogen production. According to research, the efficiency of hydrogen production by electrolysis of water is low, and highly active hydrogen evolution catalysts are conducive to improving t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90C25B1/04C25B11/06
CPCC25B1/04C25B11/091H01M4/90H01M4/9008Y02E60/36Y02E60/50
Inventor 沐杨昌施志聪陈远业刘国平兰道云
Owner GUANGDONG UNIV OF TECH
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