Preparation and application of a nitrogen-doped ternary sulfide electrocatalyst material

A sulfide electrocatalyst technology, applied in the direction of physical/chemical process catalyst, chemical/physical process, electrode, etc., can solve problems such as the reduction of catalytic water splitting efficiency, and achieve high practical application value, simple process, and easy process control. Effect

Active Publication Date: 2022-03-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the oxygen generation process is a complex oxidation-reduction process involving four electrons, it is the rate-determining step in the water splitting reaction process, resulting in a decrease in the overall catalytic water splitting efficiency

Method used

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  • Preparation and application of a nitrogen-doped ternary sulfide electrocatalyst material
  • Preparation and application of a nitrogen-doped ternary sulfide electrocatalyst material
  • Preparation and application of a nitrogen-doped ternary sulfide electrocatalyst material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Put the cleaned foamed nickel vertically into the lining of the hydrothermal kettle, then add a mixed solution of sodium molybdate and nickel chloride with a concentration of 6mmol / L, then put it into a stainless steel autoclave jacket and seal it, place it in React in an oven at 160° C. for 10 hours. After the reaction is completed, cool down to room temperature naturally, and wash the nickel sheet with distilled water and ethanol several times. Then put into the mixed solution of sodium sulfide and thioacetamide, the concentrations are 10mmol / L and 0.5mmol / L respectively, and react in hydrothermal reaction at 140°C for 24h. After the reaction, the nickel sheet is taken out, washed 3 to 5 times with deionized water, and dried at 80°C. That is, nitrogen-doped NiMoS grown on a nickel foam substrate 4 Electrocatalyst, from figure 1 It can be seen that a linear structured catalyst is obtained.

Embodiment 2

[0026] Put the cleaned foamed nickel vertically into the lining of the hydrothermal kettle, then add a mixed solution of sodium molybdate and cobalt nitrate with a concentration of 4mmol / L, then put it into a stainless steel autoclave jacket and seal it, and place it at 150 The reaction was carried out in an oven at ℃ for 16 hours. After the reaction was completed, it was naturally cooled to room temperature, and the nickel sheet was cleaned several times with distilled water and ethanol respectively. Then put into the mixed solution of sodium sulfide and thiourea, the concentrations are 6mmol / L and 1mmol / L respectively, and react in hydrothermal reaction at 160°C for 12h. After the reaction, the nickel sheet is taken out, washed 3 to 5 times with deionized water, and dried at 80°C. That is, nitrogen-doped CoMoS grown on a nickel foam substrate 4 electrocatalyst.

Embodiment 3

[0028] Put the mixed solution of sodium molybdate and cobalt chloride with a concentration of 8mmol / L into the jacket of a stainless steel autoclave and seal it, place it in an oven at 200°C for 24 hours, and cool it naturally to room temperature after the reaction is completed. Wash several times with distilled water and ethanol. Then put into the mixed solution of sodium sulfide and thiourea, the concentrations are 12mmol / L and 1.5mmol / L respectively, and react in hydrothermal reaction at 180°C for 12h. After the reaction, the product was collected, washed 3 to 5 times with deionized water and absolute ethanol, and dried at 80°C. That is, nitrogen-doped CoMoS 4 electrocatalyst particles.

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Abstract

The invention relates to the preparation and application of a nitrogen-doped ternary sulfide electrocatalyst material, belonging to the technical field of catalysts. The method comprises the following steps: using hydrochloric acid, absolute ethanol and deionized metal substrate to ultrasonically remove oxides and impurities on the surface; adding transition metal precursor salt and soluble salt of tungsten or molybdenum to deionized water, stirring and dissolving; vertically Put it directly into the hydrothermal kettle, then add the above solution to carry out hydrothermal reaction; wash the product, then put it into the hydrothermal kettle, add the solution containing sulfur source and nitrogen source to carry out sulfur nitriding reaction; the obtained product is deionized water After washing and drying, a nitrogen-doped ternary sulfide electrocatalyst is obtained. The preparation of the granules dispenses with the introduction of the substrate. In-situ nitrogen doping was performed during the preparation of the X‑M‑S catalyst, which enhanced its catalytic performance as a catalyst for electrolysis of water.

Description

technical field [0001] The invention provides a preparation technology of a nitrogen-doped ternary sulfide electrocatalyst material, belonging to the technical field of catalysts. Background technique [0002] While traditional energy reserves are decreasing day by day and pollution is increasing day by day, the exploration and application of new energy sources has become the key to improving this situation. Hydrogen energy has the characteristics of high energy density, cleanness and environmental protection, and is considered to be an excellent substitute for fossil fuels. Electrolyzed water has become one of the most promising green hydrogen production methods due to its environmental friendliness, high product purity, and no carbon emissions. Platinum, iridium and other noble metal-based materials are efficient catalysts for electrolysis of water, but their reserves are scarce and expensive, which has become the most important bottleneck restricting the large-scale appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/077C25B11/031C25B1/04
CPCB01J27/24B01J35/0033C25B1/04C25B11/031C25B11/075Y02E60/36
Inventor 胡鹏王金淑
Owner BEIJING UNIV OF TECH
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