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Supported cobalt-doped cerium dioxide nano-sheet preparation method

A ceria, supported technology, applied in the field of nanomaterials, can solve the problems of difficult two-dimensional flake nanostructure, inability to apply, poor conductivity, etc., and achieves the effect of clear structure, poor conductivity and uniform thickness

Active Publication Date: 2019-11-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This crystal structure is not layered, so it is difficult to directly synthesize uniform two-dimensional sheet-like nanostructures by exfoliation.
In addition, in the existing reports, unsupported ceria nanomaterials are limited by the disadvantage of easy aggregation, which limits the exposure and application of active sites; the conductivity of undoped pure ceria nanomaterials is too high. Poor, unable to be further applied in related fields such as electrocatalysis

Method used

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  • Supported cobalt-doped cerium dioxide nano-sheet preparation method
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  • Supported cobalt-doped cerium dioxide nano-sheet preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 0.5 mmol of cobalt acetate, 1.5 mmol and 125 mg of hexamethylenetetramine were dissolved in a mixed solution of ethanol (7 mL) and ethylene glycol (7.5 mL). The solution and copper foam carrier (2cm×3cm) were transferred to a 50mL hydrothermal kettle, and reacted in an oven at 170°C for 8h. The resulting product was washed with ethanol and air-dried naturally. The resulting precursor was calcined in a tube furnace at 400 °C for 2 h to obtain supported cobalt-doped ceria nanosheets (such as figure 2 ). The morphology of the material obtained by further removal is an ultrathin uniform nanosheet (such as figure 1 ), and its layer thickness is about 4nm (such as image 3 ). The electrocatalytic hydrogen evolution performance of the obtained supported cobalt-doped ceria nanosheets was tested in 1.0M potassium hydroxide solution, and the current density was 100mA cm -2 , the overpotential is 132mV (such as Figure 4 ).

Embodiment 2

[0023] 0.33 mmol of cobalt acetate, 1.67 mmol and 125 mg of hexamethylenetetramine were dissolved in a mixed solution of ethanol (7 mL) and ethylene glycol (7.5 mL). The solution and copper foam carrier (2cm×3cm) were transferred to a 50mL hydrothermal kettle, and reacted in an oven at 170°C for 8h. The resulting product was washed with ethanol and air-dried naturally. The obtained precursor was calcined in a tube furnace at 400° C. for 2 h to obtain supported cobalt-doped ceria nanosheets. The electrocatalytic hydrogen evolution performance of the obtained supported cobalt-doped ceria nanosheets was tested in 1.0M potassium hydroxide solution, and the current density was 100mA cm -2 , the overpotential is 134mV (such as Figure 4 ).

Embodiment 3

[0025] 1 mmol of cobalt acetate, 1 mmol and 125 mg of hexamethylenetetramine were dissolved in a mixed solution of ethanol (7 mL) and ethylene glycol (7.5 mL). The solution and copper foam carrier (2cm×3cm) were transferred to a 50mL hydrothermal kettle, and reacted in an oven at 170°C for 8h. The resulting product was washed with ethanol and air-dried naturally. The obtained precursor was calcined in a tube furnace at 400° C. for 2 h to obtain supported cobalt-doped ceria nanosheets. The electrocatalytic hydrogen evolution performance of the obtained supported cobalt-doped ceria nanosheets was tested in 1.0M potassium hydroxide solution, and the current density was 100mA cm -2 , the overpotential is 146mV (such as Figure 4 ).

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Abstract

The invention discloses a supported cobalt-doped cerium dioxide nano-sheet preparation method, which specifically comprises: growing cobalt-doped basic cerous carbonate in situ on a matrix material byusing a solvothermal method to obtain a precursor; and calcining the obtained precursor, and thermally stripping to obtain the supported cobalt-doped cerium dioxide nano-sheets. According to the present invention, the two-dimensional sheet-like structure of the non-layered crystal is prepared by using the thermal stripping method, and the defects of poor conductivity and easy agglomeration of thecerium dioxide nanometer material are effectively solved through doping, loading and other basic means; and the supported cobalt-doped cerium dioxide nano-sheets have excellent electrocatalytic hydrogen evolution activity so as to achieve a certain industrial value.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of supported cobalt-doped ceria nanosheets. Background technique [0002] my country has abundant reserves of rare earth resources, and its industrial reserves rank first in the world. Rare earths account for 0.0153% of the earth's crust, of which cerium is the most abundant (0.0046%) in the earth's crust, and cerium oxide accounts for 50% of the proven reserves of rare earths. Cerium dioxide, an extremely important rare earth material, is widely used in electronic ceramics, polishing agents, ultraviolet absorbers, gas sensors, optical materials and other fields. Especially in the field of catalysis, different from the cerium oxide obtained by the oxalic acid precipitation method in traditional industrialization, ceria nanomaterials with different nanostructures (particles, cubes, rods, wires, flowers, spheres, flakes) rely on their The sp...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/02C25B1/04C25B11/06
CPCB01J23/83C25B1/04C25B11/04B01J35/33B01J35/40Y02E60/36
Inventor 康毅进蒋帅虎张儒雅
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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