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Thickness-controllable bismuth nanosheet and preparation method and application of alloy

A bismuth nanometer and alloy technology is applied in the field of preparation of bismuth nanosheets and their alloys, which can solve the problems of high overpotential, poor stability, low efficiency, etc. Effect

Active Publication Date: 2018-09-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the efficiency of metal catalysts reported so far for the conversion of carbon dioxide to formic acid is still very low, the required overpotential is very high, the hydrogen evolution potential is relatively positive, and the stability is not good.

Method used

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  • Thickness-controllable bismuth nanosheet and preparation method and application of alloy
  • Thickness-controllable bismuth nanosheet and preparation method and application of alloy
  • Thickness-controllable bismuth nanosheet and preparation method and application of alloy

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[0039] A method for preparing bismuth nanosheets with controllable thickness provided by the invention comprises the following steps:

[0040] The bismuth nanosheets are prepared by using bismuth salt compounds as raw materials and ethylene glycol ether as a solvent through aqueous solution reduction.

[0041] A specific scheme of a method for preparing bismuth nanosheets with controllable thickness is as follows:

[0042] Add 0.5mmol-5mmol of bismuth salts to 200-300mL of ethylene glycol ether, stir ultrasonically until the solution becomes transparent, then stir and react at 25-120°C for 30-60min under the protection of inert gas, and cool After reaching normal temperature, add 20-40mmol NaBH dropwise in an inert gas atmosphere 4 or LiBH 4 The reducing solution is continuously stirred and reacted for 15-30 minutes. After the reaction is completed, it is sonicated, filtered with ethanol and water, washed, collected, and dried to obtain bismuth nanosheets. Preferably, the bis...

Embodiment 1

[0049] Preparation of Bismuth Nanosheets with a Thickness of 0.7nm

[0050] Add 0.5mmol of bismuth chloride to 200mL of ethylene glycol ethyl ether, stir until the solution becomes transparent, then stir and react at 25°C for 30min under the protection of an inert gas, cool to room temperature, and inert gas atmosphere Add 20mmol NaBH dropwise 4 The reducing solution was stirred and reacted for 15 minutes. After the reaction, it was ultrasonically filtered with ethanol and water, washed, collected, and dried to obtain bismuth nanosheets with a thickness of 0.7 nm.

[0051] figure 1 It is a transmission electron microscope image of the bismuth nanosheets prepared in Example 1 of the present invention. It can be seen from this image that the bismuth nanosheets prepared in this example present an ultrathin sheet structure.

[0052] figure 2 The atomic force microscope image of the bismuth nanosheets prepared in Example 1 of the present invention; it can be seen from the image...

Embodiment 2

[0058] Preparation of Bismuth Nanosheets with a Thickness of 4nm

[0059] Add 2.5mmol of bismuth nitrate compound into 250mL of ethylene glycol ethyl ether, stir it evenly until the solution becomes transparent, then under the protection of inert gas, stir and react at 70°C for 45min, after cooling to room temperature, in the atmosphere of inert gas Add 30mmol LiBH dropwise 4 The reducing solution was stirred and reacted for 20 minutes. After the reaction, it was ultrasonically filtered with ethanol and water, washed, collected, and dried to obtain bismuth nanosheets with a thickness of 4 nm.

[0060] Figure 4 The atomic force microscope image of the bismuth nanosheets prepared in Example 2 of the present invention, it can be seen from the figure that the layer thickness of the bismuth nanosheets is 4 nm.

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Abstract

The invention relates to a thickness-controllable bismuth nanosheet, and a preparation method and application of an alloy, and aims at solving the technical problems that when a traditional metal catalyst is used for converting carbon dioxide into formic acid, the efficiency is low, the overpotential is high, the hydrogen evolution potential is relatively positive, and the stability is poor. The bismuth nanosheet with the thickness of only 0.7nm monatomic layer is obtained for the first time by using salts of bismuth as raw materials, ethylene glycol monoethyl ether as a solvent and a solutionwith strong reducibility such as NaBH4 or LiBH4 as a reducing agent through an aqueous solution reduction method under the protection of an inert gas, and the thickness of the bismuth nanosheet is adjustable. The thickness controlled bismuth nanosheet prepared by the method shows excellent CO2 catalytic reduction performance; the Faradic efficiency of catalyzing CO2 to generate formic acid by using the bismuth nanosheet in the case of overpotential being 330mV can reach 98%; the initial overpotential of the bismuth nanosheet is as low as 80mV; the stability of the bismuth nanosheet is as longas 75h; and even the bismuth nanosheet is treated for 4h at the temperature of 300 DEG C, the thickness and catalytic performance of the bismuth nanosheet hardly change, thus further the fact that the bismuth nanosheet has superhigh stability is verified.

Description

technical field [0001] The invention relates to a preparation method of a nanometer material, in particular to a preparation method and application of a thickness-controllable bismuth nanosheet and an alloy thereof. Background technique [0002] Since the industrial revolution, the demand and utilization of energy by human beings have been increasing; at the same time, the energy and environmental problems caused by the massive burning of fossil fuels have become more and more prominent. The CO in the atmosphere 2 The accumulation of concentration not only leads to the occurrence of the greenhouse effect, but also a waste of resources. CO emitted into the atmosphere 2 Absorbing and converting into usable energy substances can not only reduce the CO emitted into the atmosphere by human activities 2 It can also partly solve the problem of energy depletion caused by the depletion of fossil fuels. Electrocatalytic reduction of CO 2 Clean renewable energy such as solar energy...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00B22F1/054B22F1/068
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0551B22F1/068B22F1/07B22F1/054C22C12/00C25B3/25
Inventor 徐维林杨发阮明波张玉微宋平
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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