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A method for controllable synthesis of bi nanosheets with different preferred orientations of crystal planes

A technology of preferred orientation and nanosheets, applied in nanotechnology, electrolytic components, electrodes, etc., to achieve the effects of low energy consumption, high efficiency and selectivity, and convenient operation

Active Publication Date: 2022-04-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of two-dimensional materials with a high surface-to-volume ratio can expose a large number of catalytic active sites, which is conducive to the rapid transfer of interfacial charges and improves the electrocatalytic CO 2 conversion efficiency of RR, but the kinetically favorable competing reaction of electrocatalytic hydrogen evolution (HER) still affects the CO 2 Selectivity of RR products [Feaster, J.T.; Shi, C.; Cave, E.R.; et al.ACS Catal.2017, 7, 4822-4827]

Method used

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  • A method for controllable synthesis of bi nanosheets with different preferred orientations of crystal planes
  • A method for controllable synthesis of bi nanosheets with different preferred orientations of crystal planes
  • A method for controllable synthesis of bi nanosheets with different preferred orientations of crystal planes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Add 50mL 0.6mol L to a 100mL beaker -1 NaI solution, adjust the pH to 13;

[0042] (2) Add 30 mg of 50 nm Bi nanoparticles with a purity of 99% to the beaker of step (1), ultrasonically disperse for 5 min, and stir vigorously for 5 h;

[0043] (3) After the product obtained in step (2) was fully washed with ultrapure water, it was dried in an electric blast drying oven at 60°C for 6 hours to obtain Bi with preferred orientation of (004) crystal plane 5 o 7 I.

[0044] (4) Bi with preferred orientation of (004) crystal plane obtained in step (3) 5 o 7 I was dispersed in 100 μL ethanol at a concentration of 10 g / L, and then 1 mg / cm 2 The loading amount sprayed to 2.25cm 2 On carbon paper, the (004) crystal plane preferred orientation Bi was obtained after drying 5 o 7 I electrode.

[0045] (5) The (004) crystal plane preferred orientation Bi obtained in step (4) 5 o 7 The I electrode was electroreduced at -1.0V vs. RHE for 10min to obtain (003) crystal plan...

Embodiment 2

[0050] (1) Add 50mL 0.8mol L to a 100mL beaker -1 NaI solution, adjust the pH to 12;

[0051] (2) Add 30 mg of 100 nm Bi nanoparticles with a purity of 99% to the beaker of step (1), ultrasonically disperse for 6 min, and stir vigorously for 6 h;

[0052] (3) After fully washing the product obtained in step (2) with ultrapure water, dry it in an electric blast drying oven at 80°C for 4 hours to obtain the Bi with preferred orientation of (004) crystal plane 5 o 7 I.

[0053] (4) Bi with preferred orientation of (004) crystal plane obtained in step (3) 5 o 7 I was dispersed in 100 μL ethanol at a concentration of 5 g / L, and then 0.5 mg / cm 2 The loading amount sprayed to 2.25cm 2 On carbon paper, the (004) crystal plane preferred orientation Bi was obtained after drying 5 o 7 I electrode.

[0054] (5) The (004) crystal plane preferred orientation Bi obtained in step (4) 5 o 7 The I electrode was electroreduced at -1.2V vs. RHE for 20min to obtain (003) crystal plane p...

Embodiment 3

[0056] (1) Add 50mL 0.7mol L to a 100mL beaker -1 NaI solution, adjust the pH to 7;

[0057] (2) Add 30 mg of 50 nm Bi nanoparticles with a purity of 99% to the beaker of step (1), ultrasonically disperse for 5 min, and stir vigorously for 5 h;

[0058] (3) After fully washing the product obtained in step (2) with ultrapure water, dry it in an electric blast drying oven at 70°C for 5 hours to obtain BiOI with a preferred orientation of (102) crystal plane, figure 1 The XRD spectrum of the BiOI with the preferred orientation of the (102) crystal plane prepared in this example.

[0059] (4) Disperse the BiOI with the preferred orientation of (102) crystal plane obtained in step (3) in 100 μL ethanol at a concentration of 10 g / L, and then 2 The loading amount sprayed to 2.25cm 2 On carbon paper, BiOI electrode with preferred orientation of (102) crystal plane was obtained after drying.

[0060] (5) The (102) crystal plane preferred orientation BiOI electrode obtained in step ...

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Abstract

The invention discloses a method for controllably synthesizing Bi nanosheets with preferred orientations of different crystal planes, belonging to the technical field of micro / nano material preparation. In the present invention, bismuth iodide oxide with different preferred orientations of crystal planes is controllably synthesized under normal temperature and pressure, and then converted into Bi nanosheets with preferred orientations of (012) and (003) crystal planes through electrochemical reduction topologically using this as a template. Bi nanosheets with preferred orientation of (003) facets electrocatalyze CO at ‑0.85V vs. RHE potential 2 The faradaic efficiency of reducing formic acid is as high as 98%, and the partial current density of formic acid production can be greater than 100mA / cm at ‑1.05vs.RHE potential 2 , and has a micron-scale lateral size, a larger surface-to-volume ratio, which can expose more catalytic active sites, which is conducive to electron conduction, and electrocatalyzes CO 2 The reduction of formic acid has higher efficiency and selectivity, is very economical and practical, and has good industrial application potential.

Description

technical field [0001] The invention relates to a method for controllably synthesizing Bi nanosheets with preferred orientations of different crystal planes, and belongs to the technical field of micro / nano material preparation. Background technique [0002] The rapid development of modern industry has led to an increase in the consumption of fossil fuels year by year, exacerbating the energy crisis and global warming. CO 2 The utilization of resources has attracted the attention and thinking of more and more scholars. Electrocatalytic CO 2 Reduction (CO 2 RR) using renewable electricity to convert CO 2 Conversion to fuels or chemical feedstocks offers a promising strategy for carbon cycling. In recent years, non-toxic and inexpensive two-dimensional layered metal Bi and Bi-based catalysts have been used to electrocatalyze CO with high selectivity. 2 Reduction produces formic acid, and only with H 2 and almost negligible CO as a by-product, which has attracted extensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/075C25B3/07C25B3/26B82Y40/00
CPCB82Y40/00
Inventor 张颖王丹王妍颖刘起辛朱永法潘成思娄阳
Owner JIANGNAN UNIV