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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AI-Extracted Technical Summary

Problems solved by technology

In the electrolysis of water, we often use acidic solution as the electrolyte, but transition metals are easily...
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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.

Application Domain

Electrode shape/forms

Technology Topic

Potassium ferrocyanideCOBALTOUS NITRATE +12

Image

  • 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(2)
  • Comparison scheme(1)
  • Effect test(1)

Example Embodiment

[0028] Example 1
[0029] A preparation method of a catalyst for electrolysis of water for hydrogen production, 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) Mix solution A and solution B fully under magnetic stirring, then age at room temperature for 30 h, and then separate to obtain a precipitate, which is washed with water and ethanol respectively, and dried at 60 °C for 10 h to obtain the precursor. , denoted as MOF;
[0032] (3) The obtained precursor was heated to 750 °C at a rate of 3 °C/min in a tube furnace under nitrogen atmosphere and calcined for 1 h, and the atmosphere flow was controlled at 200 mL·min −1 , to obtain catalyst 1, denoted as CoFeNC750; pickling CoFeNC750 in 2 M hydrochloric acid for 4 days to wash away most of the metal in the carbon shell to obtain catalyst 1', denoted as CoFeNCH750.

Example Embodiment

[0033] Example 2
[0034] The difference from Example 1 is that: in step (3), the calcination temperature is 600° C. to obtain catalyst 2, denoted as CoFeNC600; further pickling obtains catalyst 2', denoted as CoFeNCH600;
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Description & Claims & Application Information

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