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A carbon-coated janus structure metal/metal oxide composite catalyst and its preparation and application

A technology of composite catalysts and oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as the difficulty in synergistically exerting the catalytic effects of metals and oxides , to achieve the effect of avoiding organizational changes, wide application range and improving stability

Active Publication Date: 2021-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many cases, the prepared metal / oxide has a core-shell structure, and its interface is wrapped in a thicker metal or oxide, which makes it difficult to synergistically play the catalytic role of metal and oxide.

Method used

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  • A carbon-coated janus structure metal/metal oxide composite catalyst and its preparation and application
  • A carbon-coated janus structure metal/metal oxide composite catalyst and its preparation and application
  • A carbon-coated janus structure metal/metal oxide composite catalyst and its preparation and application

Examples

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Embodiment 1

[0045] A carbon-coated Janus structure metal / metal oxide composite catalyst (CoMo / CoMoO x @C) preparation method, comprises the following steps:

[0046] (1) Conductive substrate pretreatment: Cut the pure copper sheet into a rectangle with a size of 1x5cm, ultrasonically clean the cut pure copper sheet in acetone for 15 minutes, and then ultrasonically clean it in absolute ethanol for 10 minutes. After cleaning in acetone and anhydrous Rinse with plenty of deionized water after ethanol cleaning.

[0047] (2) Cathode plasma electrodeposition: Dissolve cobalt nitrate, sodium molybdate, sodium citrate and EDTA-2Na in a mixed solution of ethylene glycol and water, where the volume ratio of ethylene glycol and water is 3:2 to obtain electrolysis Liquid, the concentration of cobalt nitrate in the electrolyte is 0.1mol / L, the concentration of sodium molybdate 0.1mol / L, the concentration of sodium citrate is 0.05mol / L and the concentration of EDTA-2Na is 0.02mol / L; With step ( 1) T...

Embodiment 2

[0069] A kind of preparation method of carbon coating Janus structure metal / metal oxide composite catalyst, comprises the following steps:

[0070] (1) substrate pretreatment, same as embodiment 1 step (1);

[0071] (2) Cathode plasma electrodeposition: Dissolve nickel sulfate, sodium molybdate, sodium citrate and EDTA-2Na in a mixed solution of ethylene glycol and water, where the volume ratio of ethylene glycol and water is 3:2 to obtain electrolysis Liquid, the concentration of nickel sulfate in the electrolytic solution is 0.1mol / L, the concentration of sodium molybdate 0.1mol / L, the concentration of sodium citrate is 0.05mol / L and the concentration of EDTA-2Na is 0.02mol / L; With step ( 1) The pretreated pure copper sheet is used as the cathode, and the platinum sheet is used as the anode for cathode plasma electrodeposition. The power supply voltage is set to 130V, and the electrodeposition time is 5min. After the sample preparation is completed, the residual solution on ...

Embodiment 3

[0074] A kind of preparation method of carbon coating Janus structure metal / metal oxide composite catalyst, comprises the following steps:

[0075] (1) substrate pretreatment, same as embodiment 1 step (1);

[0076] (2) Cathode plasma electrodeposition: Dissolve nickel sulfate, cobalt nitrate, sodium citrate and EDTA-2Na in a mixed solution of ethylene glycol and water, wherein the volume ratio of ethylene glycol to water is 3:2 to obtain an electrolyte , the concentration of cobalt nitrate in the electrolyte is 0.1mol / L, the concentration of nickel sulfate 0.1mol / L, the concentration of sodium citrate is 0.05mol / L and the concentration of EDTA-2Na is 0.02mol / L; With step (1) The pretreated pure copper sheet is used as the cathode, and the platinum sheet is used as the anode for cathode plasma electrodeposition. The power supply voltage is set to 130V, and the electrodeposition time is 5 minutes. After the sample preparation is completed, the residual solution on the surface i...

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Abstract

The invention belongs to the technical field of electrocatalysts, and discloses a carbon-coated Janus structure metal / metal oxide composite catalyst as well as its preparation and application. Method: Using the DC power supply of the two-electrode system, the conductive substrate for depositing the composite catalyst is used as the cathode, and the solution containing the transition metal compound is used as the electrolyte, and the cathode plasma electrodeposition technology is used for cathodic plasma electrodeposition. catalyst; the solvent in the electrolyte is an organic solvent and water. Catalyst of the present invention comprises the metal / oxide of Janus structure, and this structure provides more heterojunction interface, has improved the activity of catalyst; The metal / oxide outer layer of Janus structure is covered carbon thin layer, and this carbon The thin layer acts as a protection and increases the stability of the catalyst. The method of the invention is simple, and the prepared catalyst has good activity and stability, and is used in the field of electrolyzing water to produce hydrogen.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysts, and in particular relates to a carbon-coated Janus structure metal / metal oxide composite catalyst and a preparation method and application thereof. The application of the composite catalyst in electrolyzing water to prepare hydrogen is used for HER electrocatalyst. Background technique [0002] The development of a sustainable and renewable energy and its manufacturing and storage technology is the key to solving environmental problems and meeting energy challenges. Hydrogen energy has incomparable advantages over other energy sources. Its mass energy density is high and its products are non-polluting. It is a research hotspot in the energy field. Hydrogen production by electrolysis of water is one of the most promising hydrogen production methods. However, hydrogen produced by water electrolysis currently accounts for only 4% of hydrogen energy sources, and its potential is far from b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04C25D3/56C25D9/08B01J35/00
CPCB01J23/882C25B1/04C25D3/562C25D9/08C25B11/091B01J35/00B01J35/30B01J35/33Y02E60/36
Inventor 张果戈马晓姚芯傅年庆
Owner SOUTH CHINA UNIV OF TECH
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