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Preparation method of MoS2/S-NiCoCr-LDH composite material

A composite material and product technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of reducing the Faraday efficiency of the reaction, difficult to catalyze the reaction, poor conductivity, etc., to improve the performance of electrocatalytic nitrogen reduction, simple process, easy to use The effect obtained

Inactive Publication Date: 2021-03-02
葛宗义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, the theoretical potential of the electrocatalytic hydrogen production reaction in the water phase is smaller than that of the NRR, and the catalyst is more easily compatible with H 2 O binding, which makes H 2 It has become the main by-product in NRR, which greatly reduces the faradaic efficiency of the reaction. Therefore, the development of efficient, stable and good selectivity NRR electrocatalysts has become a research hotspot at this stage.
[0004] Due to its layered structure and high specific surface area, transition metal LDH materials are currently widely used catalysts in the field of electrochemical synthesis of ammonia, but their poor electrical conductivity affects their further development. Mo-based materials are important catalysts in the field of nitrogen fixation, but It has poor stability when used in electrochemical synthesis of ammonia, so it is difficult to immobilize this type of catalyst on the electrode for efficient catalytic reaction

Method used

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  • Preparation method of MoS2/S-NiCoCr-LDH composite material
  • Preparation method of MoS2/S-NiCoCr-LDH composite material
  • Preparation method of MoS2/S-NiCoCr-LDH composite material

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Embodiment 1

[0031] A kind of MoS 2 / S-NiCoCr-LDH composite material specifically includes the following preparation steps:

[0032] (1) Add 1mmol chromium nitrate, 1.5mmol cobalt nitrate, 1.5mmol nickel nitrate and 2mmol urea into 200ml deionized water, stir magnetically for 30min, then add 1mol / L NaOH solution dropwise, adjust the pH of the solution to 10, and then in 100℃ Stir in an oil bath for 24 hours, then wash with deionized water until neutral, and dry at a constant temperature of 80°C;

[0033] (2) Add 200 mg of the product of step (1) into 50 ml of deionized water, add 100 mg of Na 2 S, stirred for 30 minutes, transferred to a polytetrafluoroethylene reactor, hydrothermally reacted at 120°C for 24h, after the reaction was completed, washed with deionized water, and vacuum-dried at 60°C;

[0034](3) Add 200 mg of the product of step (2) into 100 ml of deionized water, add 300 mg of sodium molybdate, 200 mg of thioacetamide and 100 mg of cetyltrimethylammonium bromide, ultrasoni...

Embodiment 2

[0039] A kind of MoS 2 / S-NiCoCr-LDH composite material specifically includes the following preparation steps:

[0040] (1) Add 1mmol chromium nitrate, 0.5mmol cobalt nitrate, 2.5mmol nickel nitrate and 1.5mmol urea into 200ml deionized water, stir magnetically for 30min, then add 1mol / L NaOH solution dropwise, adjust the pH of the solution to 10, and then Stir in an oil bath for 18 hours, then wash with deionized water until neutral, and dry at a constant temperature of 80°C;

[0041] (2) Add 200 mg of the product of step (1) into 50 ml of deionized water, add 50 mg of Na 2 S, stirred for 30 minutes, transferred to a polytetrafluoroethylene reactor, hydrothermally reacted at 100°C for 16h, after the reaction was completed, washed with deionized water, and vacuum-dried at 60°C;

[0042] (3) Add 200 mg of the product of step (2) to 100 ml of deionized water, add 200 mg of sodium molybdate, 100 mg of thioacetamide and 40 mg of hexadecyltrimethylammonium bromide, ultrasonicate ...

Embodiment 3

[0045] A kind of MoS 2 / S-NiCoCr-LDH composite material specifically includes the following preparation steps:

[0046] (1) Add 1mmol chromium nitrate, 2.5mmol cobalt nitrate, 0.5mmol nickel nitrate and 3mmol urea into 200ml deionized water, stir magnetically for 30min, then add 1mol / L NaOH solution dropwise, adjust the pH of the solution to 10, and then set the solution at 120°C Stir in an oil bath for 32 hours, then wash with deionized water until neutral, and dry at a constant temperature of 80°C;

[0047] (2) Add 200 mg of the product of step (1) to 50 ml of deionized water, add 200 mg of Na 2 S, stirred for 30 minutes, transferred to a polytetrafluoroethylene reactor, hydrothermally reacted at 150°C for 36h, after the reaction was completed, washed with deionized water, and vacuum-dried at 60°C;

[0048] (3) Add 200 mg of the product of step (2) to 100 ml of deionized water, add 400 mg of sodium molybdate, 300 mg of thioacetamide and 150 mg of cetyltrimethylammonium bro...

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Abstract

The invention discloses a preparation method of a MoS2 / S-NiCoCr-LDH composite material, which comprises the following steps of: dissolving chromium nitrate, nickel nitrate, cobalt nitrate and urea indeionized water, dropwisely adding sodium hydroxide to regulate the pH value, reacting, carrying out hydrothermal reaction with sodium sulfide, and reacting with sodium molybdate and thioacetamide toobtain a MoS2 / S-NiCoCr-LDHs composite material. The prepared MoS2 / S-NiCoCr-LDHs composite material is applied to electrocatalysts for electrochemical synthesis of ammonia .

Description

technical field [0001] The invention relates to the field of electrocatalysts for electrochemical synthesis of ammonia, in particular to a MoS 2 / S-NiCoCr-LDH composite material preparation method. Background technique [0002] Ammonia is an important chemical production raw material and chemical product. The output of ammonia is the largest among all chemical products in the world, because it is indispensable in the manufacture of nitrogen fertilizer and the production of various compound fertilizers. One of the missing raw materials. Therefore, it can be said that ammonia has played a fundamental role in the advancement and prosperity of human economy and civilization. In addition, the proportion of hydrogen in ammonia molecules is also very high, which can reach 17.6%. Compared with liquid hydrogen, liquid ammonia has the advantages of safety, stability and ease of transportation, so it can be used as a medium for storing energy and hydrogen. Modern ammonia synthesis t...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B1/27
CPCC25B1/00
Inventor 葛宗义庄建国
Owner 葛宗义
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