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A kind of ruthenium dioxide/graphene two-dimensional material, its preparation method and application

A two-dimensional material, ruthenium dioxide technology, applied in the field of materials, can solve the problems of increased oxygen evolution activity of ruthenium dioxide, low work efficiency, insoluble transition metal elements, etc., achieves excellent electrocatalytic oxygen evolution activity, and is convenient for popularization and application. , the effect of excellent electrical conductivity

Active Publication Date: 2022-05-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This defect structure leads to the enhanced oxygen evolution activity of ruthenium dioxide
However, this defect structure is rarely formed when ruthenium dioxide works in an alkaline solution, because the transition metal elements of the composite ruthenium-based oxide are difficult to dissolve in the alkaline electrolyte and precipitate out.
Therefore, ruthenium dioxide needs an overpotential of 240mV in alkaline electrolyte to reach 10mAcm -2 The polarization current density of ruthenium dioxide is far behind the optimal basic oxygen evolution electrocatalyst (overpotential of 190mV, reaching 10mAcm-2), which hinders the application of ruthenium dioxide in basic electrocatalysis
In summary, the current ruthenium dioxide can only work efficiently in acidic electrolytes, and work inefficiently in alkaline electrolytes
However, the existing preparation methods cannot prepare ruthenium dioxide with intrinsic defect structure

Method used

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  • A kind of ruthenium dioxide/graphene two-dimensional material, its preparation method and application
  • A kind of ruthenium dioxide/graphene two-dimensional material, its preparation method and application
  • A kind of ruthenium dioxide/graphene two-dimensional material, its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0064] The preparation method of embodiment 1 defect ruthenium dioxide / graphene two-dimensional material

[0065] figure 1 shows the flow chart of the preparation of ruthenium dioxide / graphene two-dimensional material, according to figure 1 The process flow shown prepares ruthenium dioxide / graphene two-dimensional material, and the specific operation steps are as follows:

[0066] (1) Prepare 20 mL of graphene oxide solution with a content of 1 mg / mL with deionized water.

[0067] (2) Prepare 0.5 mL of ruthenium trichloride hydrate solution with a content of 20 mg / mL with deionized water.

[0068] (3) Drop the ruthenium trichloride hydrate solution into the graphene oxide solution for 10 minutes, and stir at room temperature for 20 minutes, so that the ruthenium trichloride is adsorbed on the surface of the graphene oxide.

[0069] (4) The mixed solution of step (3) is frozen into ice cubes with liquid nitrogen, and the gained ice cubes are put into a freeze dryer to remove...

Embodiment 2

[0071] The preparation method of embodiment 2 defect ruthenium dioxide / graphene two-dimensional material

[0072] (1) Use deionized water to prepare a graphene oxide solution with a content of 0.5 mg / mL, 20 mL.

[0073] (2) Prepare 0.5 mL of ruthenium trichloride hydrate solution with a content of 10 mg / mL with deionized water.

[0074] (3) Drop the ruthenium trichloride hydrate solution into the graphene oxide solution for 20 minutes, and stir at room temperature for 10 minutes to make the ruthenium trichloride adsorb on the surface of the graphene oxide.

[0075] (4) The mixed solution of step (3) is frozen into ice cubes with liquid nitrogen, and the gained ice cubes are put into a freeze dryer to remove the moisture in the solid to obtain solid ruthenium trichloride hydrate / graphene oxide dihydrate dimensional material. The temperature inside the freeze dryer is -25°C, the air pressure is 40Pa, and the freeze-drying time is 5 days.

[0076] (5) Put the ruthenium trichlo...

Embodiment 3

[0077] The preparation method of embodiment 3 defect ruthenium dioxide / graphene two-dimensional material

[0078] (1) Prepare 20 mL of graphene oxide solution with a content of 5 mg / mL with deionized water.

[0079] (2) Prepare 0.5 mL of ruthenium trichloride hydrate solution with a content of 100 mg / mL with deionized water.

[0080] (3) Drop the ruthenium trichloride hydrate solution into the graphene oxide solution for 5 minutes, and stir at room temperature for 30 minutes, so that the ruthenium trichloride is adsorbed on the surface of the graphene oxide.

[0081] (4) The mixed solution of step (3) is frozen into ice cubes with liquid nitrogen, and the gained ice cubes are put into a freeze dryer to remove the moisture in the solid to obtain solid ruthenium trichloride hydrate / graphene oxide dihydrate dimensional material. The temperature inside the freeze dryer is -100°C, the air pressure is 10Pa, and the freeze-drying time is 1 day.

[0082] (5) Put the ruthenium trich...

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Abstract

The application discloses a ruthenium dioxide / graphene two-dimensional material, comprising: graphene; ruthenium dioxide, adsorbed on the graphene; wherein, the ruthenium dioxide / graphene two-dimensional material has intrinsic defects . The application also provides the preparation method and application of the ruthenium dioxide / graphene two-dimensional material. The ruthenium dioxide / graphene two-dimensional material has an intrinsic oxygen-deficient ruthenium dioxide structure, does not need to be corroded by an acidic solution, and effectively solves the problem that the oxygen-deficient structure of ruthenium dioxide can only be produced in an acidic solution.

Description

technical field [0001] The application relates to a ruthenium dioxide / graphene two-dimensional material, its preparation method and application, and belongs to the field of materials. Background technique [0002] The development of highly efficient oxygen evolution electrocatalysts is key for electrochemical water splitting and regenerative fuel cells. Oxygen evolution electrocatalysts usually work in corrosive solutions, including acidic and alkaline electrolytes. So far, only Ir and Ru oxygen evolution electrocatalysts can work stably in various electrolytes. In particular, ruthenium dioxide-based electrocatalysts are considered to be the best electrocatalysts for oxygen evolution in acidic electrolytes. Composite ruthenium-based oxides have developed an efficient and stable electrolytic water catalyst under acidic conditions. The composite ruthenium-based oxides have a polarization current of 10 mAcm -2 Only an overpotential of 171mV is required at a high current dens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46C25B1/04C25B11/065C25B11/075C01G55/00C01B32/184B82Y30/00
CPCB01J23/462C25B1/04C01G55/004C01B32/184B82Y30/00B01J35/33Y02E60/36
Inventor 吴忠帅李亚光
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI