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A bifunctional electrocatalyst supported by ruthenium phosphide supported carbon microsheets and its preparation and application of high-efficiency electrolytic hydrogen production

An electrocatalyst and microchip technology, which can be used in catalyst activation/preparation, physical/chemical process catalysts, electrolysis components, etc., and can solve problems such as few reports.

Active Publication Date: 2021-07-06
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, hydrazine hydrate oxidation-assisted hydrogen production is an efficient hydrogen production strategy, but there are still few related reports.

Method used

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  • A bifunctional electrocatalyst supported by ruthenium phosphide supported carbon microsheets and its preparation and application of high-efficiency electrolytic hydrogen production
  • A bifunctional electrocatalyst supported by ruthenium phosphide supported carbon microsheets and its preparation and application of high-efficiency electrolytic hydrogen production
  • A bifunctional electrocatalyst supported by ruthenium phosphide supported carbon microsheets and its preparation and application of high-efficiency electrolytic hydrogen production

Examples

Experimental program
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Effect test

preparation example Construction

[0048] The present invention also provides a method for preparing the above-mentioned ruthenium phosphide-supported carbon microsheet bifunctional electrocatalyst, comprising the following steps:

[0049] The ruthenium salt and the organic phosphorus source compound are mixed and then calcined under the condition of protective atmosphere to obtain the bifunctional electrocatalyst of the ruthenium phosphide supported carbon microsheet.

[0050] In the invention, firstly, the ruthenium salt and the organic phosphorus source compound are mixed to obtain a precursor.

[0051] The present invention has no special restrictions on the mixing method, which can be dry mixing, that is, directly mixing the ruthenium salt and the organic phosphorus source compound and then grinding to obtain the precursor;

[0052] It is also possible to disperse and mix the ruthenium salt and the organophosphorus source compound in a solvent, centrifuge and dry to obtain a precursor. Wherein, the solven...

Embodiment 1

[0066] The ruthenium source is ruthenium trichloride, and the organic carbon source is melamine phosphate, and the molar ratio is 1:15.

[0067] (1) Disperse ruthenium trichloride and melamine phosphate in ethanol at a molar ratio of 1:15, stir for 30 minutes, centrifuge at 8000 rpm for 2 minutes, and dry overnight at 80°C to obtain a precursor.

[0068] (2) Place the precursor in (1) in a tube furnace, raise it to 850°C at 2°C / min in an argon-hydrogen mixed atmosphere with a hydrogen volume content of 10%, and keep it for 2h, then naturally cool to room temperature, Obtain the target product.

[0069] The hydrogen evolution and hydrazine hydrate oxidation performance adopts a three-electrode system. The working electrode is a glassy carbon electrode with a diameter of 3mm, the counter electrode is a graphite rod electrode, and the reference electrode is a mercury / mercury oxide electrode. The electrolyte is 1.0M KOH or 1.0M KOH +0.3M N 2 h 4 , the polarization curve scan ra...

Embodiment 2

[0078] The preparation method is the same as in Example 1, except that the molar ratio of ruthenium trichloride and melamine phosphate is 1:5.

[0079] Figure 6 Shown is the morphology and phase diagram of the target product obtained in Example 2, A is the transmission electron microscope image of the target product obtained in Example 2, and B is the XRD pattern of the target product obtained in Example 2. It can be seen from the figure that the synthesized material is a loose porous structure composed of ruthenium phosphide nanoparticles loaded on the surface of carbon microsheets.

[0080] Figure 7 Shown are the electrocatalytic hydrogen evolution and hydrazine hydrate oxidation performance diagrams of the target product obtained in Example 2, A is the hydrogen production performance diagram of electrolyzed water, and B is the hydrazine hydrate oxidation performance diagram. It can be seen from the figure that the synthesized material is at 1.0MKOH and 1.0M KOH+0.3MN 2...

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Abstract

The invention provides a bifunctional electrocatalyst of ruthenium phosphide supported carbon micro-sheets, which is a composite structure of ruthenium phosphide nanoparticles and carbon micro-sheets. The nanosheets constitute a loose porous structure. The bifunctional electrocatalyst of the present invention can be used for the electrocatalytic oxidation and water electrolytic reduction of small molecule hydrazine hydrate at the same time. At the same time, the traditional electrochemical oxygen evolution reaction is replaced by the oxidation of hydrazine hydrate with low thermodynamic potential, and a two-electrode electrolysis system is constructed to realize Low energy consumption, stable electrochemical hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to the preparation of a bifunctional electrocatalyst supported by ruthenium phosphide-supported carbon microsheets and the application of high-efficiency electrolytic hydrogen production. Background technique [0002] Hydrogen production by electrolysis of water is an ideal method for producing high-purity hydrogen. However, limited by the slow four-electron reaction at the anode, commercial electrolysis of water often needs to overcome an overpotential of 600-800 mV to produce hydrogen effectively, and the stability is poor. Good catalysts for hydrogen and oxygen production are realized under acidic and alkaline conditions, respectively, which increases the complexity and cost of electrolyzed water devices. Therefore, replacing the kinetically slow water oxidation reaction with an oxidation reaction with a lower thermodynamic potential is the best way to reduce energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185B01J35/00B01J35/10B01J37/08C25B1/02C25B1/04C25B11/091
CPCB01J27/1856B01J35/0033B01J35/006B01J35/10B01J37/082B01J37/084C25B1/02C25B1/04C25B11/04Y02E60/36
Inventor 章根强李亚鹏
Owner UNIV OF SCI & TECH OF CHINA
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