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Nanoscale ruthenium dioxide-coated ruthenium-loaded carbon micron sheet, and preparation method and application thereof

A technology of ruthenium dioxide and micron flakes, applied in the direction of electrolysis components, electrodes, electrolysis process, etc., can solve the problems of less active sites, poor conductivity, increase the complexity and cost of electrolyzed water devices, etc.

Active Publication Date: 2021-06-04
UNIV OF SCI & TECH OF CHINA
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  • Claims
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Problems solved by technology

[0003] The electrolysis of water consists of two half-reactions of hydrogen evolution (HER) at the cathode and oxygen evolution (OER) at the anode. The use of electrochemical catalysts can reduce the overpotential of electrolyzed water to produce hydrogen, thereby improving the energy conversion efficiency. However, it is limited by the slow four-electron reaction at the anode. Commercial electrolyzed water often needs to overcome the overpotential of 600-800mV to effectively produce hydrogen, and the stability is poor. At the same time, it has been reported that better catalysts for hydrogen production and oxygen production can be realized under acidic and alkaline conditions, respectively, increasing the electrolysis. Due to the complexity and cost of water devices, the development of effective catalysts for electrolysis of water, especially bifunctional catalysts with universal pH, is crucial to realize the efficient utilization of hydrogen from electrolysis of water.
[0004] Ruthenium-based materials are recognized OER benchmark catalysts, but their performance is still far behind that of the currently reported electrocatalysts such as nickel-iron oxides / oxyhydroxides, which may be due to their fewer active sites and poor electrical conductivity. sex
At the same time, it has been reported that ruthenium-based nanomaterials have platinum-like HER activity in acidic and alkaline environments, mainly due to their small size and inherent high catalytic activity, indicating that ruthenium-based materials have potential excellent dual-functional total water splitting. activity, but there are few reports on its total water splitting performance, and its catalytic performance still needs to be improved

Method used

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  • Nanoscale ruthenium dioxide-coated ruthenium-loaded carbon micron sheet, and preparation method and application thereof
  • Nanoscale ruthenium dioxide-coated ruthenium-loaded carbon micron sheet, and preparation method and application thereof
  • Nanoscale ruthenium dioxide-coated ruthenium-loaded carbon micron sheet, and preparation method and application thereof

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preparation example Construction

[0049] The invention provides a preparation method of nanoscale ruthenium dioxide-coated ruthenium-loaded carbon microsheets, comprising: S1) dispersing ruthenium salt and organic carbon source in an alcohol solvent, after mixing, performing solid-liquid separation to obtain a precursor The organic carbon source contains nitrogen; or the ruthenium salt and the organic carbon source are mixed and ground to obtain a precursor; S2) the precursor is calcined at a high temperature in a reducing atmosphere to obtain an intermediate product; S3) the intermediate The product is calcined at a low temperature in an air atmosphere to obtain nanoscale ruthenium dioxide-coated ruthenium-loaded carbon microsheets.

[0050] The nano-scale ruthenium dioxide-coated ruthenium-loaded carbon microsheets provided by the present invention can be produced only by simple adsorption, followed by high-temperature calcination and low-temperature air annealing. The synthesis method is relatively simple, t...

Embodiment 1

[0067] The ruthenium source is ruthenium trichloride, the organic carbon source is melamine, and the molar ratio is 1:15.

[0068] (1) Disperse ruthenium trichloride and melamine in ethanol at a molar ratio of 1:15, stir for 30 minutes, centrifuge at 8000 rpm for 2 minutes, and dry at 60°C overnight to obtain a precursor.

[0069] (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, An intermediate product is obtained.

[0070] (3) Place the intermediate product obtained in (2) in a muffle furnace, raise it to 200°C at 2°C / min, and keep it for 3h, then naturally cool to room temperature to obtain the final product: nano-scale ruthenium dioxide coated ruthenium Loaded carbon microflakes.

[0071] The nanoscale ruthenium dioxide-coated ruthenium-loaded carbon microsheet obtained in Example 1 is analyzed by X-ray dif...

Embodiment 2

[0086] The preparation method is the same as in Example 1, except that the heat treatment time in the muffle furnace is changed to 1h.

[0087] The nanoscale ruthenium dioxide-coated ruthenium-loaded carbon microsheets obtained in Example 2 are analyzed by transmission electron microscope, and its transmission electron microscope diagram is obtained as Figure 8 shown. Depend on Figure 8 It can be seen that the synthesized material is a loose and porous microsheet structure composed of nanoparticles.

[0088] Utilize X-ray diffractometer to analyze the nanoscale ruthenium dioxide-coated ruthenium-loaded carbon microsheet obtained in embodiment 2, obtain its XRD pattern, as Figure 9 shown. Depend on Figure 9 It can be seen that the characteristic diffraction peaks of ruthenium dioxide and ruthenium exist simultaneously.

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Abstract

The invention provides a preparation method of a nanoscale ruthenium dioxide-coated ruthenium-loaded carbon micron sheet. Compared with the prior art, the preparation method of the nano-scale ruthenium dioxide coated ruthenium-loaded carbon micron sheet has the advantages that the nano-scale ruthenium dioxide coated ruthenium-loaded carbon micron sheet prepared by the preparation method has the characteristics of high loading capacity and high dispersion and has a large specific surface area and a large number of mesoporous structures; the micro ruthenium dioxide coated ruthenium nanoparticles and carbon are chemically coupled together, so that the conductivity of the material is improved; the electronic structure of the material is improved and the number of active sites is increased by increasing the loading capacity of the ruthenium dioxide coated ruthenium nanoparticles; meanwhile, due to the large specific surface area and a large number of mesoporous structures, electrolyte permeation and gas release are facilitated, and the electro-catalytic activity and stability of the material are synergistically improved; and the preparation method is simple, consists of simple adsorption, calcination and oxidation, is high in operability, easy to repeat, high in stability and easy for large-scale production, and can meet the actual requirement of hydrogen production by fully decomposing water.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a nanoscale ruthenium dioxide-coated ruthenium-supported carbon microsheet, a preparation method and application thereof. Background technique [0002] Hydrogen is a clean and efficient secondary energy carrier, providing an ideal alternative energy source for mankind to fundamentally solve global problems such as energy and the environment. Hydrogen production by electrolysis of water is an ideal method for producing high-purity hydrogen, which is an important part of modern clean energy technology. [0003] The electrolysis of water consists of two half-reactions of hydrogen evolution (HER) at the cathode and oxygen evolution (OER) at the anode. The use of electrochemical catalysts can reduce the overpotential of electrolyzed water to produce hydrogen, thereby improving the energy conversion efficiency. However, it is limited by the slow four-electron reaction at ...

Claims

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Application Information

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IPC IPC(8): C25B11/093C25B1/04
CPCC25B1/04Y02E60/36
Inventor 章根强李亚鹏
Owner UNIV OF SCI & TECH OF CHINA
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