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Catalyst for efficiently electrocatalytically synthesizing ammonia and preparation method thereof

A technology for electrocatalysis and ammonia synthesis, which is applied to electrodes, electrolysis components, electrolysis processes, etc., can solve problems such as low Faradaic efficiency of catalysts, and achieve the effects of improving the activity and selectivity of NH3 synthesis, simple operation and low cost.

Pending Publication Date: 2022-08-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalysts reported so far cannot meet the commercial needs, mainly because their surface active sites are more likely to adsorb protons than N. 2 , making most catalysts faradaic inefficient

Method used

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  • Catalyst for efficiently electrocatalytically synthesizing ammonia and preparation method thereof
  • Catalyst for efficiently electrocatalytically synthesizing ammonia and preparation method thereof
  • Catalyst for efficiently electrocatalytically synthesizing ammonia and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a NiCoP / CoMoP / Co(Mo 3 Se 4 ) 4 The @C / NF catalyst was prepared as follows:

[0037] (1) The NiCoMo-OH-urea precursor deposited on the nickel foam substrate was prepared by hydrothermal reaction:

[0038] 3mmol cobalt nitrate, 2mmol sodium molybdate, 2mmol urea and 2mmol ammonium fluoride were mixed in 50mL deionized water, stirred for 4 hours to be completely dissolved; then mixed solution and the foam nickel of 1cm × 5cm size were put into the reactor together. The reaction was carried out at 120 °C for 5 hours, and the reactants were naturally cooled to room temperature; the reacted nickel foam was washed and washed alternately with ethanol and deionized water for three times, and then vacuum-dried. The vacuum drying box was set to 35 °C and dried for 12 hours. NiCoMo-OH-urea precursor.

[0039] (2) Preparation of NiCoP / CoMoP / Co(Mo 3 Se 4 ) 4 @C / NF Catalyst:

[0040] Place 2mmol selenium powder, NiCoMo-OH-urea precursor obtained in ste...

Embodiment 2

[0044] This embodiment provides a NiCoP / CoMoP / Co(Mo 3 Se 4 ) 4 The @C / NF catalyst was prepared as follows:

[0045] (1) The NiCoMo-OH-urea precursor deposited on the nickel foam substrate was prepared by hydrothermal reaction:

[0046] 3mmol cobalt nitrate, 1mmol sodium molybdate, 2mmol urea and 2mmol ammonium fluoride were mixed in 50mL deionized water, stirred for 4 hours to be completely dissolved; then mixed solution and the foam nickel of 1cm × 3cm size were put into the reactor together. The reaction was carried out at 120 °C for 5 hours, and the reactants were naturally cooled to room temperature; the reacted nickel foam was washed and washed alternately with ethanol and deionized water for three times, and then vacuum-dried. The vacuum drying box was set to 35 °C and dried for 12 hours. NiCoMo-OH-urea precursor.

[0047] (2) Preparation of NiCoP / CoMoP / Co(Mo 3 Se 4 ) 4 @C / NF Catalyst:

[0048] Place 2mmol selenium powder, NiCoMo-OH-urea precursor obtained in ste...

Embodiment 3

[0051] This embodiment provides a NiCoP / CoMoP / Co(Mo 3 Se 4 ) 4 The @C / NF catalyst was prepared as follows:

[0052] (1) The NiCoMo-OH-urea precursor deposited on the nickel foam substrate was prepared by hydrothermal reaction:

[0053] 3mmol cobalt nitrate, 2mmol sodium molybdate, 2mmol urea and 2mmol ammonium fluoride were mixed in 50mL deionized water, stirred for 4 hours to be completely dissolved; The mixed solution and the foam nickel of 1cm×4cm size were put into the reactor together. The reaction was carried out at 110 °C for 5 hours, and the reactant was naturally cooled to room temperature; the reacted nickel foam was washed and washed alternately with ethanol and deionized water three times, and then vacuum-dried. The vacuum drying box was set to 40 °C and dried for 10 hours to obtain NiCoMo-OH-urea precursor.

[0054] (2) Preparation of NiCoP / CoMoP / Co(Mo 3 Se 4 ) 4 @C / NF Catalyst:

[0055] Place 2mmol selenium powder, NiCoMo-OH-urea precursor obtained in step ...

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Abstract

The invention relates to a catalyst for efficient electrocatalytic synthesis of ammonia and a preparation method thereof. The preparation method of the catalyst comprises the following steps: (1) preparing a NiCoMo-OH-urea precursor deposited on a foamed nickel substrate by adopting a hydrothermal reaction; (2) selenium powder, sodium hypophosphite and the NiCoMo-OH-urea precursor prepared in the step (1) are calcined in an inert atmosphere, and the NiCoP / CoMoP / Co (Mo3Se4) 4-coated C / NF catalyst for efficient electrocatalytic synthesis of ammonia is obtained. The obtained catalyst has a triple heterojunction interface, has high conductivity and high interconnectivity, and inhibits HER activity while effectively improving NRR performance.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a catalyst for efficient electrocatalytic ammonia synthesis and a preparation method thereof. Background technique [0002] Ammonia (NH 3 ) is one of the most important inorganic chemicals for agricultural and industrial purposes in the world, and is also considered to be the most ideal hydrogen storage molecule and clean energy carrier. So nitrogen fixation by reducing atmospheric nitrogen to ammonia has become one of the most important processes in the world. At present, the industrial production of ammonia still relies heavily on the traditional Haber-Bosch method, which uses nitrogen (N 2 ) and hydrogen (H 2 ) high temperature (400-500℃) high pressure (200-250bar) synthesis of NH 3 , in the process, the energy consumption is huge (consumption of 1-3% of the global annual power generation), and a large amount of carbon dioxide (CO 2 ) gas (per ton of NH produced 3 About 1.87...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B11/061C25B11/031C25B1/27
CPCC25B11/091C25B11/061C25B11/031C25B1/27Y02P20/52
Inventor 王海辉李昕廖益文
Owner TSINGHUA UNIV