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Preparation method and application of two-dimensional bismuthene nanosheet

A technology of nanosheets and bismuth salts, applied in the field of electrochemistry, to achieve the effect of simple synthesis method, abundant raw materials and excellent performance

Active Publication Date: 2020-04-21
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the examples reported so far, there are almost no catalysts that can simultaneously satisfy high current density, high selectivity in a wide potential window, and high stability.

Method used

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  • Preparation method and application of two-dimensional bismuthene nanosheet
  • Preparation method and application of two-dimensional bismuthene nanosheet
  • Preparation method and application of two-dimensional bismuthene nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1B

[0044] The preparation of embodiment 1Bi-MOFs-1 precursor

[0045] 1.0 mmol of bismuth nitrate pentahydrate, 2.0 mmol of 4,5-imidazoledicarboxylic acid, and 1.0 mmol of piperazine were added together to 10.0 mL of ultrapure water and stirred for 30 minutes. Then the mixture was transferred to a reaction kettle, and heated to 170° C. for 72 hours. After the reaction, the precipitate at the bottom of the reactor was taken out and washed several times with deionized water, and dried in an oven at 60°C to obtain the Bi-MOFs-1 precursor. Analyze the structure and appearance of the samples. figure 1 (a) is the XRD spectrum of the theoretical Bi-MOFs-1, (b) is the XRD spectrum of the experimentally measured Bi-MOFs-1. The experimentally measured XRD patterns are highly consistent with the theoretical ones, indicating that the prepared Bi-MOFs-1 are phase-pure samples. figure 2 (a) and (b) are the SEM and TEM images of Bi-MOFs-1, respectively, indicating that the prepared Bi-MOFs-...

Embodiment 2

[0046] Example 2 Using Bi-MOFs-1 as a precursor to convert two-dimensional ultrathin bismuthene nanosheets (Bi-ene-1)

[0047] Take 10.0 mg of Bi-MOFs-1 precursor and add 1.0 mL of deionized water / ethanol / Nafion (Nafion is its isopropanol solution, the concentration is 5wt%) to the mixed solution (volume ratio is 7:2:1), Ultrasound for 1 hour to disperse the Bi-MOFs-1 precursor uniformly to obtain a slurry, and then take 0.2mL of the slurry and evenly coat it on a 1.0cm 2 on the carbon paper, so that the loading of Bi-MOFs-1 is 2.0mg cm –2 . After natural drying, the carbon paper coated with Bi-MOFs-1 was used as the working electrode, the saturated Ag / AgCl electrode was used as the reference electrode, the platinum mesh was used as the counter electrode, and 0.5 mol / L potassium bicarbonate saturated with argon The solution is an electrolyte. Then the working electrode was scanned by cyclic voltammetry for 100 cycles in the specified potential window (–1.0–(–1.8V)vs.Ag / AgCl...

Embodiment 3 2

[0048] Example 3 Two-dimensional ultrathin bismuth ene nanosheets (Bi-ene-1) and commercial Bi powder for electrochemical catalysis of CO 2 Restore performance test

[0049] The gas diffusion electrode loaded with Bi-ene-1 obtained in Example 2 was directly used as the working electrode, the saturated Ag / AgCl electrode was used as the reference electrode, and the platinum mesh was used as the counter electrode to test its electrochemical catalytic CO 2 Reduction of the performance of the preparation of formic acid.

[0050] The instruments used are CHI 760E electrochemical workstation and ECZ400S nuclear magnetic resonance instrument. The test device is a proton membrane (perfluorosulfonic acid resin 117) Separated H-type electrochemical reactor, CO 2 The volume of the electrolyte in the reaction chamber is 11.0mL, and the electrolyte is 0.5M KHCO 3 (pH=7.2), normal temperature and pressure, gas flow rate 30.0cc·min –1 , the working electrode area is 1.0cm 2 .

[0051]...

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Abstract

The invention discloses a preparation method of a bismuth-based carbon dioxide (CO2) electrochemical reduction catalytic material. A two-dimensional ultrathin bismuthene nanosheet prepared by the method is used as the catalytic material, so that the electrochemical reduction activity of CO2 can be remarkably improved, hydrogen evolution side reaction is inhibited, the selectivity and current of aproduct formate are enhanced, the potential window of electrochemical reduction of CO2 into formic acid / formate is widened, CO2 is reduced into formic acid almost by 100% in a very wide potential window, and meanwhile, the current density is very high. The preparation method of the two-dimensional ultrathin bismuthene nanosheet can directly obtain the required catalytic material by taking a bismuth-based metal organic framework polymer as a precursor through an in-situ electrochemical conversion method, and the high-quality ultrathin bismuthene nanosheet is obtained while the synthesis time isgreatly shortened.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method and application of two-dimensional bismuthene nanosheets. Background technique [0002] In recent years, atmospheric CO 2 Concentrations continue to rise and cause the greenhouse effect to become more and more serious. Therefore, the development of effective technologies to achieve CO 2 The transformation and utilization of these materials has important practical significance and economic value. However, due to CO 2 The molecule itself has extremely high stability, which makes its transformation and utilization face great challenges. Electrochemical reduction of CO 2 Not only can CO 2 It also has the advantages of simple equipment, mild reaction conditions and controllable products, which can significantly reduce costs and realize large-scale production. [0003] Electrochemical CO 2 The products of conversion are complex, including various...

Claims

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Application Information

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IPC IPC(8): C25B3/04C25B11/06C25D3/54B01J31/22B82Y40/00B82Y30/00C25B3/25
CPCC25D3/54B82Y40/00B82Y30/00B01J31/1815B01J31/2213B01J31/2265B01J2531/54C25B3/25C25B11/075B01J35/33
Inventor 朱起龙曹昌盛林华
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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