Preparation method and application of a kind of bismuth nanosheet with controllable thickness and its alloy

A bismuth nanometer and bismuth chloride technology is applied in the field of preparation of bismuth nanosheets and their alloys, which can solve the problems of low efficiency, high overpotential, poor stability and the like, and achieves simple process flow, low overpotential and environmental friendliness. Effect

Active Publication Date: 2019-08-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • 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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  • Preparation method and application of a kind of bismuth nanosheet with controllable thickness and its alloy
  • Preparation method and application of a kind of bismuth nanosheet with controllable thickness and its alloy
  • Preparation method and application of a kind of bismuth nanosheet with controllable thickness and its alloy

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preparation example Construction

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

Embodiment 1

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

[0050] Add 0.5 mmol of bismuth chloride to 200 mL of ethylene glycol ether, stir until the solution becomes transparent, then stir and react at 25 °C for 30 min under the protection of an inert gas, cool to room temperature, and Add 20 mmol NaBH dropwise in the atmosphere 4 The reducing solution was stirred and reacted for 15 min. After the reaction, it was ultrasonicated, 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 Atomic force microscope image of the bismuth nanosheets prepared in Example 1 of the present invention; it can be seen from the image that its ...

Embodiment 2

[0058] Preparation of bismuth nanosheets with a thickness of 4 nm

[0059] Add 2.5 mmol of bismuth nitrate compound into 250 mL of ethylene glycol ethyl ether, stir ultrasonically until the solution becomes transparent, then stir and react at 70 °C for 45 min under the protection of an inert gas, cool to room temperature, and Add 30 mmol LiBH dropwise in the atmosphere 4 The reducing solution was stirred and reacted for 20 min. After the reaction, it was ultrasonicated, 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 thickness of the bismuth nanosheets is 4 nm.

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Abstract

The invention relates to a preparation method and application of a bismuth nanosheet with controllable thickness and its alloy, which solves the problem of low efficiency, high overpotential, relatively positive hydrogen evolution potential and poor stability of existing metal catalysts for converting carbon dioxide into formic acid technical problem. Under the protection of inert gas, the present invention uses bismuth salt compound as raw material, ethylene glycol ether as solvent, and NaBH 4 or LiBH 4 A solution with strong reducibility is used as a reducing agent, and bismuth nanosheets with a thickness of only 0.7nm and a single atomic layer thickness are obtained by aqueous solution reduction; and the thickness is adjustable. The bismuth nanosheets prepared by the present invention exhibit excellent CO 2 Catalytic reduction performance, under the condition of overpotential 330mV, it can catalyze CO 2 The Faraday efficiency of generating formic acid can reach 98%, the initial overpotential is as low as 80mV, and the stability is as long as 75h, and even if it is treated at 300°C for 4h, the thickness and catalytic performance of bismuth nanosheets have almost no change, which is further confirmed its high stability.

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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Patent Type & Authority Patents(China)
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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