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A method for preparing bi nanosheets by electrochemical exfoliation

A technology of nanosheet and exfoliation method, which is applied in chemical instruments and methods, catalyst activation/preparation, nanotechnology, etc., can solve the problems of low melting point of metal bismuth and difficulty in realizing metal bismuth, and achieve high purity, good industrialization prospects, and surface The effect of more active sites

Active Publication Date: 2021-04-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, graphite is the pioneer of two-dimensional materials, and the current research is the most. Similar to metal Bi, it is also a two-dimensional layered material, but the melting point of metal bismuth is low (271.3°C), and it can be used in acid-base solutions and containing All cannot exist stably under an oxygen atmosphere, so it is difficult to directly synthesize metals with nanostructures.

Method used

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  • A method for preparing bi nanosheets by electrochemical exfoliation
  • A method for preparing bi nanosheets by electrochemical exfoliation
  • A method for preparing bi nanosheets by electrochemical exfoliation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040](1) Add 50mL of 0.5mol·L to the cathode and anode electrolytic cells of H-Cell (100mL specification) -1 NaI solution, and pass 20min N into the cathode electrolytic cell 2 ;

[0041] (2) Take the size as 5mm 3 , 99.99% pure metal Bi block is used as cathode, Pt sheet electrode is used as anode, DC regulated power supply provides 15V voltage, and N is continuously passed to the cathode electrolytic cell during power-on. 2 ;

[0042] (3) After energizing for 2 hours, the solution in the cathodic electrolytic cell was vacuum filtered by a vacuum filter, the precipitate was fully washed with ultrapure water, and the product was collected and dried in an electric vacuum oven at 80°C for 4 hours to obtain Bi nanosheets.

[0043] Characterization tests:

[0044] Carry out XRD test to the Bi nanosheet prepared in this embodiment, figure 1 For the XRD spectrum of the Bi nanosheets prepared in this example, the PDF card comparison proves that the prepared product is Bi. At th...

Embodiment 2

[0047] (1) Add 50mL of 1.0mol L to the cathode and anode electrolytic cells of H-Cell (100mL specification) -1 NaI solution, and pass 20min N into the cathode electrolytic cell 2 ;

[0048] (2) Take the size as 5mm 3 , 99.99% pure metal Bi block is used as cathode, Pt sheet electrode is used as anode, DC regulated power supply provides 30V voltage, and N is continuously passed to cathode electrolytic cell during power-on process 2 ;

[0049] (3) After energizing for 3 hours, the solution in the cathodic electrolytic cell was vacuum filtered by a vacuum filter, the precipitate was fully washed with ultrapure water, and the product was collected and dried in an electric vacuum oven at 60°C for 6 hours to obtain Bi nanosheets.

Embodiment 3

[0051] (1) Add 50mL of 0.7mol·L to the cathode and anode electrolytic cells of H-Cell (100mL specification) -1 NaI solution, and pass 20min N into the cathode electrolytic cell 2 ;

[0052] (2) Take the size as 5mm 3 , 99.99% pure metal Bi block is used as cathode, Pt sheet electrode is used as anode, DC regulated power supply provides 10V voltage, and N is continuously passed to the cathode electrolytic cell during power-on process 2 ;

[0053] (3) After electrifying for 4 hours, the solution in the cathodic electrolytic cell was vacuum filtered by a vacuum filter, the precipitate was fully washed with ultrapure water, and the product was collected and dried in an electric vacuum oven at 70°C for 5 hours to obtain Bi nanosheets.

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Abstract

The invention discloses a method for preparing Bi nanosheets by an electrochemical stripping method, and belongs to the technical field of micro / nano material preparation. The present invention adopts the electrochemical exfoliation method to prepare Bi nanosheets, uses the Pt sheet electrode as the anode, the metal Bi block as the cathode, and the NaI solution as the supporting electrolyte solution. 2 Under protection, the bulk metal Bi is peeled off under the voltage condition of 10-30V. The as-prepared Bi nanosheets have high purity and can electrocatalytically reduce CO over a wide potential range. 2 The faradaic efficiency of formic acid production can reach more than 94%, and the current density can reach 50mA / cm at a lower electrolysis potential (‑0.5V vs. RHE) 2 above. Compared with Bi nanosheets prepared by mechanical methods, the electrochemical exfoliation method is easier to obtain Bi nanosheets with more uniform shape and size and more surface active sites, and it is simple to operate, low in energy consumption, very economical and practical, and has great potential. Good prospects for industrialization.

Description

technical field [0001] The invention relates to a method for preparing Bi nanosheets by an electrochemical stripping method, and belongs to the technical field of micro / nano material preparation. Background technique [0002] Inexpensive and low-toxic Bi is a very potential CO reduction 2 An electrocatalyst for the production of formic acid, which reacts to CO 2 · - The intermediate exhibits a weak affinity for CO 2 Side reaction of RR - generation of H 2 (HER) reactions are inherently inert. Although metallic Bi electrocatalytically reduces CO 2 The selectivity of formic acid is close to 100%, but the catalytic current density is not ideal. In order to further improve the performance of Bi-based materials in CO 2 The catalytic performance in the reduction reaction requires rational structure design and surface interface regulation of materials at the nanoscale. [0003] Bi and black phosphorus have a similar layered crystal structure, each layer is a warped honeycom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/075C25B3/07C25B3/26B01J23/18B01J37/34B82Y40/00C25B3/25
CPCB01J23/18B01J37/348B82Y40/00
Inventor 张颖王丹朱永法潘成思娄阳
Owner JIANGNAN UNIV
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