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A nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchip, its preparation method and application

A ruthenium dioxide, microchip technology, applied in the direction of electrolysis components, electrodes, electrolysis process, etc., can solve the problems of increasing the complexity and cost of water electrolysis devices, the catalytic performance needs to be improved, and the number of active sites, etc., and it is easy to large-scale Production, improved electrocatalytic activity and stability, easily reproducible effects

Active Publication Date: 2022-07-15
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchip, its preparation method and application
  • A nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchip, its preparation method and application
  • A nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchip, its preparation method and application

Examples

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preparation example Construction

[0049] The present invention provides a preparation method of nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchips, comprising: S1) dispersing ruthenium salt and organic carbon source in an alcohol solvent, and 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 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 nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchips.

[0050] The nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchips provided by the present invention only need simple adsorption, followed by high-temperature calcination and low-temperature air annealing. degree, and it has excellent hydrogen...

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 min, centrifuge at 8000 rpm for 2 min, and dry at 60° C. overnight to obtain a precursor.

[0069] (2) The precursor in (1) was placed in a tube furnace, raised to 850°C at 2°C / min in an argon-hydrogen mixed atmosphere with a hydrogen volume content of 10%, kept for 2h, and then cooled to room temperature naturally, Intermediate product is obtained.

[0070] (3) placing the intermediate product obtained in (2) in a muffle furnace, raising the temperature to 200° C. at 2° C. / min, and maintaining it for 3 hours, and then naturally cooling to room temperature to obtain the final product: nano-scale ruthenium dioxide coated ruthenium Supported carbon microflakes.

[0071] The nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchip obtaine...

Embodiment 2

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

[0087] The nano-scale ruthenium dioxide-coated ruthenium-supported carbon microchip obtained in Example 2 was analyzed by transmission electron microscope, and its transmission electron microscope image was obtained as follows Figure 8 shown. Depend on Figure 8 It can be seen that the synthesized material is a loose and porous microplate structure composed of nanoparticles.

[0088] The nanoscale ruthenium dioxide-coated ruthenium-supported carbon microchip obtained in Example 2 was analyzed by an X-ray diffractometer, and its XRD pattern was obtained, as shown in Figure 9 shown. Depend on Figure 9 It can be seen that the characteristic diffraction peaks of ruthenium dioxide and ruthenium coexist.

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Abstract

The present invention provides a method for preparing nano-scale ruthenium dioxide-coated ruthenium-supported carbon micro-sheets. Compared with the prior art, the nano-scale ruthenium dioxide-coated ruthenium-supported carbon micro-sheets prepared by the present invention have high loading, High dispersion properties with large specific surface area and abundant mesoporous structure, which by chemically coupling tiny ruthenium dioxide-coated ruthenium nanoparticles with carbon, improve the electrical conductivity of the material, and improve the conductivity of the material by increasing the ruthenium dioxide Coating the loading of ruthenium nanoparticles to improve the electronic structure of the material and increase the number of active sites, while the large specific surface area and the existence of a large number of mesoporous structures are conducive to electrolyte penetration and gas release, synergistically improving the electrical properties of the material. Catalytic activity and stability; and the preparation method is simple, consists of simple adsorption, calcination and oxidation, has strong operability, is easy to repeat, has good stability, is easy to produce on a large scale, and can meet the actual requirements of hydrogen production by total hydrolysis.

Description

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

Claims

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Application Information

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