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Water electrolysis hydrogen production catalyst and preparation method thereof

A technology of catalyst and electrolysis of water, which is applied in the direction of electrolysis process, electrolysis components, electrodes, etc., can solve the problems of catalytic activity and stability reduction, and achieve the effect of high activity and stability

Active Publication Date: 2018-07-24
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the electrolysis of water, we often use acidic solution as the electrolyte, but transition metals are easily dissolved in acidic solution, resulting in a corresponding decrease in their catalytic activity and stability.

Method used

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  • Water electrolysis hydrogen production catalyst and preparation method thereof
  • Water electrolysis hydrogen production catalyst and preparation method thereof
  • Water electrolysis hydrogen production catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of a catalyst for hydrogen production by electrolysis of water, the steps are as follows:

[0030] (1) Dissolve 1.34 g of cobalt nitrate hexahydrate and 0.44 g of sodium citrate in 20 ml of deionized water to form solution A; dissolve 0.64 g of potassium ferrocyanide trihydrate in 20 ml of deionized water to form solution B;

[0031] (2) Fully mix solution A and solution B under magnetic stirring, then age at room temperature for 30 h, and then separate to obtain a precipitate, wash with water and ethanol respectively, and dry at 60 °C for 10 h to obtain a precursor , denoted as MOF;

[0032] (3) The obtained precursor was calcined at a rate of 3 °C / min to 750 °C for 1 h in a nitrogen atmosphere in a tube furnace, and the flow rate of the atmosphere was controlled at 200 mL min −1 , to obtain catalyst 1, denoted as CoFeNC750; CoFeNC750 was acid-washed in 2 M hydrochloric acid for 4 days, and most of the metals in the carbon shell were washed away, ...

Embodiment 2

[0034] The difference from Example 1 is that: in step (3), the calcination temperature is 600°C to obtain catalyst 2, which is denoted as CoFeNC600; the catalyst 2' is further obtained by acid washing, which is denoted as CoFeNCH600; the others are the same as in Example 1.

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Abstract

The invention belongs to the technical field of water electrolysis hydrogen production and discloses a water electrolysis hydrogen production catalyst and a preparation method thereof. The catalyst has two structures, the first structure is a core-shell structure, the shell is a carbon shell, the carbon shell is doped with nitrogen, the core is a mixture of Fe, Co, Fe3C and Co3C, the second structure is a hollow carbon sphere structure and the carbon shell is doped with nitrogen. The preparation method comprises dissolving cobalt nitrate and sodium citrate in water to obtain a solution A, dissolving potassium ferrocyanide in water to obtain a solution B, fully mixing the solution A and the solution B under stirring, aging the mixture at the room temperature for at least 24h, then separating the precipitates, washing the precipitates with water and ethanol, carrying out drying to obtain a precursor, heating the precursor to 600-750 DEG C in an inert atmosphere, carrying out calcinationfor at least 1h, collecting the calcination product with the first structure, and immersing the calcination product with the first structure through an inorganic acid to obtain the product with the second structure. The catalyst has high activity and stability in water electrolysis hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by electrolysis of water, and in particular relates to a catalyst for hydrogen production by electrolysis of water and a preparation method thereof. Background technique [0002] As a kind of "green energy" with abundant resources and no secondary pollution, hydrogen energy is considered to be one of the ideal energy sources to solve the energy crisis and environmental crisis in the post-petroleum era. Among them, electrolytic water hydrogen evolution technology has gradually become a research hotspot due to its high efficiency, easy control, and no pollution. The products obtained by electrolytic water hydrogen evolution technology are clean and high-purity, and can also indirectly store electrical energy as chemical energy to be used. In fuel cells, catalysts are used to convert hydrogen energy into electrical energy to achieve sustainable recycling of resources. [0003] Platinum-...

Claims

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Application Information

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IPC IPC(8): C25B11/02C25B11/06C25B1/04
CPCC25B1/04C25B11/02C25B11/04Y02E60/36
Inventor 李保军刘培珍刘艳艳
Owner ZHENGZHOU UNIV
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