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Sulfur-vacancy-rich bismuth sulfide nanowires, preparation method and application thereof

A bismuth sulfide and nanowire technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of low selectivity of formic acid products, and achieve mild conditions, simple process, and selectivity of formic acid. high effect

Active Publication Date: 2021-06-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to CO 2 Theoretical equilibrium potential ratio of reduction to CO and hydrogen evolution reaction to CO 2 Reduction to formic acid is lower, so the first two reactions tend to occur more easily in the reaction, resulting in lower selectivity of formic acid product

Method used

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  • Sulfur-vacancy-rich bismuth sulfide nanowires, preparation method and application thereof
  • Sulfur-vacancy-rich bismuth sulfide nanowires, preparation method and application thereof
  • Sulfur-vacancy-rich bismuth sulfide nanowires, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] RSV-Bi 2 S 3 Nanowire preparation method, comprising the following steps:

[0033] 1) Add 1.6g sodium sulfide nonahydrate, 0.8g bismuth nitrate pentahydrate, 5g lithium hydroxide, and 10g potassium nitrate into a 100ml reaction kettle;

[0034] 2) Fully shake and oscillate to mix the reactants evenly, then add 5ml of deionized water, and put it in an oven at 120°C for 72 hours;

[0035] 3) After washing the obtained product with deionized water for 3-4 times, put it into a 70°C oven and dry it to obtain black bismuth sulfide solid nanowires;

[0036] 4) Add 35.2g of ascorbic acid to 200ml of deionized water to prepare a 1mol / L ascorbic acid solution;

[0037] 5) Add 200 mg of the bismuth sulfide obtained in step 3), and stir for 3 hours at a rotational speed of 300 r / min; 6) Wash the product with deionized water for 3-4 times, and dry it in an oven at 70°C to obtain RSV-Bi 2 S 3 Nanowires.

[0038] Take the RSV-Bi of this example 2 S 3 Taking nanowires as an exa...

Embodiment 2

[0044] RSV-Bi 2 S 3 Nanowire preparation method, comprising the following steps:

[0045] 1) Add 1.6g sodium sulfide nonahydrate, 0.8g bismuth nitrate pentahydrate, 5g lithium hydroxide, and 10g potassium nitrate into a 100ml reaction kettle;

[0046] 2) Fully shake and oscillate to mix the reactants evenly, then add 5ml of deionized water, and put it in an oven at 120°C for 72 hours;

[0047] 3) After washing the obtained product with deionized water for 3-4 times, put it into a 70° C. oven and dry it to obtain black bismuth sulfide nanowires;

[0048] 4) Add 35.2g of ascorbic acid to 200ml of deionized water to prepare a 1mol / L ascorbic acid solution;

[0049] 5) Add 200 mg of the bismuth sulfide obtained in step 3), and stir for 3 hours at a rotational speed of 350 r / min; 5) Wash the product with deionized water for 3-4 times, and dry it in an oven at 70°C to obtain RSV-Bi 2 S 3 Nanowires.

[0050] With the product RSV-Bi of the present invention 2 S 3 Taking nanowi...

Embodiment 3

[0053] RSV-Bi 2 S 3 Nanowire preparation method, comprising the following steps:

[0054] 1) Add 1.6g sodium sulfide nonahydrate, 0.8g bismuth nitrate pentahydrate, 6g lithium hydroxide, and 9g potassium nitrate into a 100ml reaction kettle;

[0055] 2) Fully shake and oscillate to mix the reactants evenly, then add 5ml of deionized water, and put it in an oven at 120°C for 72 hours;

[0056] 3) After washing the obtained product with deionized water for 3-4 times, put it into a 70° C. oven and dry it to obtain black bismuth sulfide nanowires;

[0057] 4) Add 35.2g of ascorbic acid to 200ml of deionized water to prepare a 1mol / L ascorbic acid solution;

[0058] 5) Add 300mg of bismuth sulfide obtained in step 3), and stir for 3h at a speed of 300r / min;

[0059] 5) After washing the product with deionized water for 3-4 times, put it in a 70°C oven to dry to obtain RSV-Bi 2 S 3 Nanowires.

[0060] With the product RSV-Bi of the present invention 2 S 3 Taking nanowires a...

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Abstract

The invention proposes a method for producing sulfur vacancies by partially reducing bismuth sulfide with ascorbic acid. The width of the reduced bismuth sulfide nanowires is 50-300 nanometers, and the length is 100-200 microns. This material can be used as an active material for electrocatalytic carbon dioxide reduction, and exhibits excellent product selectivity for formic acid by utilizing the specific adsorption of sulfur vacancies to active intermediates for carbon dioxide reduction. The invention has the characteristics of simple process, mild reaction conditions, excellent electrochemical properties of materials and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterials and electrocatalysis, and specifically relates to a preparation method for synthesizing bismuth sulfide nanowires with abundant sulfur vacancies by utilizing the weak reducing ability of ascorbic acid. The material can be used as an electrocatalyst for electrocatalyzing the reduction of carbon dioxide to formic acid. Background technique [0002] At present, the types of materials that have been widely studied and applied to electrocatalytic carbon dioxide (ECR) mainly include copper-based, tin-based, bismuth-based, and noble metal elements / alloys, among which copper-based catalysts are currently the only materials that can convert carbon dioxide into multi-carbon products. , but its product selectivity is still a difficult problem to solve; the noble metal element / alloy mainly converts carbon dioxide into carbon monoxide, and most of the current control strategies can increase the Faradaic efficiency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04C25B3/26C25B3/07C25B11/091C25B3/25
CPCB01J27/04C25B11/04B01J35/0033C25B3/25
Inventor 麦立强朱杰鑫杨雯暄韩春华
Owner WUHAN UNIV OF TECH
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