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A kind of nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber electrolysis water catalyst and preparation method thereof

A technology of co-doping and carbon fiber, which is applied in chemical instruments and methods, physical/chemical process catalysts, electrolytic components, etc., can solve the problems of poor catalyst stability and low electrolysis efficiency, and achieve cost savings, increased activity and stability, The effect of a simple and efficient preparation method

Active Publication Date: 2021-06-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of low electrolysis efficiency and poor stability of the catalyst used in the existing hydrogen production, the present invention proposes a nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber electrolysis water catalyst and its preparation method

Method used

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  • A kind of nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber electrolysis water catalyst and preparation method thereof
  • A kind of nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber electrolysis water catalyst and preparation method thereof
  • A kind of nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber electrolysis water catalyst and preparation method thereof

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specific Embodiment approach 1

[0035] Embodiment 1: The nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber catalyst for water electrolysis in this embodiment is composed of a carbon fiber matrix and nanoparticles; the nanoparticles are supported inside and on the surface of the carbon fiber matrix; the nanoparticles are nickel-cobalt nitrides and nickel-cobalt sulfides, nickel-cobalt nitrides have the formula Ni x Co y N z , in the molecular formula, x is 1~2, y is 1~2, z is 1~2; the molecular formula of nickel cobalt sulfide is Ni a Co b S c , in the molecular formula, a is 1-2, b is 1-2, and c is 1-2.

[0036] This embodiment has the following beneficial effects:

[0037] 1. Ni and Co in the nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber catalyst material for water electrolysis in this embodiment have unfilled valence layer d orbitals, so they have catalytic effects on hydrogen evolution and oxygen evolution reactions, and then Save costs in the actual produ...

specific Embodiment approach 2

[0040] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the particle size of the nanoparticles is 3-7 nm. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0041] Specific embodiment three: the preparation method of nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber catalyst for water electrolysis in this embodiment is carried out according to the following steps:

[0042] 1. Preparation of electrospinning precursor solution:

[0043] According to the molecular formula Ni x Co y N z and Ni a Co b S c The molar ratio of each element in the nickel nitrate, cobalt nitrate and thioamide compound was weighed as raw materials, and the weighed raw materials were added to N,N-dimethylformamide to obtain mixed solution a, which was mixed with uniform magnetic stirring at room temperature. Liquid a until the raw materials are completely dissolved, then add polyvinylpyrrolidone to obtain mixed liquid b, and uniformly magnetically stir mixed liquid b for 4 to 6 hours to obtain a completely dissolved transparent electrospinning precursor liquid; molecular formula Ni x Co y N z where x is 1-2, y is 1-2, z is 1-2; the...

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Abstract

A nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber electrolysis water catalyst and a preparation method thereof relate to a nickel-cobalt-based carbon fiber electrolysis water catalyst and a preparation method thereof. The invention aims to solve the problems of low electrolysis efficiency and poor stability of the catalyst used in the existing hydrogen production. The catalyst is composed of a carbon fiber matrix and nanoparticles; the nanoparticles are loaded inside and on the surface of the carbon fiber matrix. Preparation method: According to the molecular formula Ni x co y N z and Ni a co b S c The molar ratio of each element in the method is to weigh nickel nitrate, cobalt nitrate and thioamide compound, and then add polyvinylpyrrolidone to obtain a precursor solution; carry out electrospinning; and finally carry out high-temperature sintering. The invention is a nitrogen and sulfur in-situ co-doped nickel-cobalt-based carbon fiber electrolysis water catalyst material, which has better catalyst activity and stability. It also has dual-function catalysis of hydrogen evolution and oxygen evolution, and the electrolysis efficiency is as high as 95%. The invention is suitable for preparing electrolytic water catalyst.

Description

technical field [0001] The invention relates to a nickel-cobalt-based carbon fiber catalyst for electrolysis of water and a preparation method thereof. Background technique [0002] With the increasing energy crisis and environmental pollution, the development of various new and renewable energy sources has been highly valued by countries all over the world. Green and renewable energy sources such as wind energy, solar energy and water power have brought hope to people to solve the energy crisis. Scientific researchers from all over the world have devoted a lot of energy to the study of these green energy utilization technologies, and they have achieved great success. Among them, technologies such as wind power, photovoltaic and hydropower have been applied on a large scale. Most of the green renewable energy has the characteristics of uneven distribution in time and space, which requires us to effectively capture, store, transport and transform these energy sources to meet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02B01J35/06C25B1/04C25B11/091B01J35/00
CPCC25B1/04C25B11/04B01J27/24B01J35/33B01J35/40B01J35/58Y02E60/36
Inventor 熊岳平刘超军王状宗鑫李栋
Owner HARBIN INST OF TECH
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