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Two-dimensional bismuth nanosheet material with atomic-scale thickness as well as preparation method and application of two-dimensional bismuth nanosheet material

A bismuth nanometer and atomic-level technology is applied in the direction of electrolytic components, electrodes, and electrolytic organic production. The effect of uniform diameter distribution

Active Publication Date: 2022-06-28
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and easy to operate, and has good reproducibility, but it uses more organic solvents, the preparation process is more polluted, and the preparation process is more

Method used

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  • Two-dimensional bismuth nanosheet material with atomic-scale thickness as well as preparation method and application of two-dimensional bismuth nanosheet material
  • Two-dimensional bismuth nanosheet material with atomic-scale thickness as well as preparation method and application of two-dimensional bismuth nanosheet material
  • Two-dimensional bismuth nanosheet material with atomic-scale thickness as well as preparation method and application of two-dimensional bismuth nanosheet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing two-dimensional bismuth nanosheets with atomic thickness, comprising:

[0032] The chemically polished copper sheet is placed in a pre-prepared deposition solution, and bismuth nanoparticles are pre-deposited on the surface of the copper sheet by cyclic voltammetry. The deposition solution contains bismuth ions and bromide ions, and the bromide ions Adsorbed on the surface of pre-deposited bismuth nanoparticles as a structure inducer;

[0033] The cyclic voltammetry is replaced by a potentiostatic method, and the bismuth ions in the deposition solution are continuously reduced by the potentiostatic method to obtain bismuth particles smaller in size than the bismuth nanoparticles, and the structure inducer promotes the orientation of the bismuth particles aggregated to form two-dimensional bismuth nanosheets with atomic thickness.

[0034] like figure 1 shown, the growth of bismuth nanosheets can be attributed to the pre-synthesized bismuth nanop...

Embodiment 2

[0047] A two-dimensional bismuth nanosheet material with atomic thickness is prepared by using the method for preparing two-dimensional bismuth nanosheets as described in Embodiment 1. The related technical solutions are the same as those in the first embodiment, and are not repeated here.

Embodiment 3

[0049] a reduced CO 2 A method for producing formic acid, using a two-dimensional bismuth nanosheet material with atomic thickness as described in Example 2, electrocatalytic reduction of CO 2 Formic acid production.

[0050] The thickness of the two-dimensional bismuth nanosheets prepared in Example 1 reaches the atomic level, which can expose a large number of active sites and has good electrocatalytic reduction of CO. 2 Formic acid production performance and stability. Catalytic current density up to 50 mA / cm measured in a two-chamber H-cell 2 , its formate Faradaic efficiency reaches 98.2%, and its stability is up to 24 hours.

[0051] The related technical solutions are the same as those in the first embodiment, and are not repeated here.

[0052] In order to better illustrate the present invention, the following specific examples are now given.

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Abstract

The invention belongs to the technical field of two-dimensional material preparation, and particularly relates to a two-dimensional bismuth nanosheet material with atomic-scale thickness and a preparation method and application thereof.The preparation method comprises the steps that a chemically-polished copper sheet is placed in a pre-prepared deposition solution, and bismuth nanoparticles are obtained through pre-deposition on the surface of the copper sheet by adopting cyclic voltammetry; the deposition solution contains bismuth ions and bromide ions, and the bromide ions are adsorbed on the surfaces of the pre-deposited bismuth nanoparticles to serve as a structure inducer; a cyclic voltammetry method is replaced by a potentiostatic method, bismuth ions in a deposition solution are continuously reduced by adopting the potentiostatic method, bismuth particles smaller than bismuth nanoparticles in size are obtained, the bismuth particles are promoted to be directionally gathered by a structure inducer, and the two-dimensional bismuth nanosheet with the atomic-scale thickness is formed. The method is simple, convenient and controllable in process and small in pollution, high vacuum and high temperature conditions are not needed, and the prepared two-dimensional bismuth nanosheet with the atomic-scale thickness has good performance of producing formic acid through electrocatalytic reduction of CO2.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional material preparation, and more particularly, relates to a two-dimensional bismuth nanosheet material with atomic thickness and a preparation method and application thereof. Background technique [0002] By electrocatalytic CO 2 The reduction reaction converts CO 2 Conversion into valuable fuels is a promising technology that could alleviate the global climate crisis and energy consumption. Formate is a common CO 2 The restored product has high economic value. Metal-based catalysts such as Sn, In, Pd, Bi, and Hg have been reported to efficiently convert CO 2 Electrocatalytic conversion to formate. Bismuth-based materials are considered as promising electrocatalytic CO reduction due to their low cost, low toxicity, and low hydrogen evolution reaction activity. 2 Catalyst for the production of formic acid. However, many reported bismuth-based materials for the electrocatalytic reductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/26C25B3/07C25B11/075C25D5/18C25D5/00C25D5/34
CPCC25B3/26C25B3/07C25B11/075C25D5/18C25D5/00C25D5/34
Inventor 申燕潘杰王鸣魁
Owner HUAZHONG UNIV OF SCI & TECH