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Preparation method of metal-doped bismuth layered oxide and application of metal-doped bismuth layered oxide in electrocatalytic reduction of CO2

A metal-doped, bismuth-layered technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the unstable structure and performance of layered bismuth oxides to achieve the effects of promoting enrichment reduction, regulating charge distribution, and large electrochemical active area.

Active Publication Date: 2021-12-24
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the above problems, the object of the present invention is to provide a method for preparing metal-doped bismuth layered oxides to solve the problem of unstable structure and performance of layered bismuth oxides in the prior art

Method used

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  • Preparation method of metal-doped bismuth layered oxide and application of metal-doped bismuth layered oxide in electrocatalytic reduction of CO2
  • Preparation method of metal-doped bismuth layered oxide and application of metal-doped bismuth layered oxide in electrocatalytic reduction of CO2
  • Preparation method of metal-doped bismuth layered oxide and application of metal-doped bismuth layered oxide in electrocatalytic reduction of CO2

Examples

Experimental program
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Effect test

Embodiment 1

[0049] 1). Synthesis of silver-doped layered bismuth oxide (nanosheet array electrode) supported on carbon cloth:

[0050] a: Soak a properly cut carbon cloth in 0.5mol / L potassium permanganate solution for half an hour, take it out, clean it with deionized water and dry it.

[0051] b: Dissolve 25mg of bismuth nitrate in 3mL of ethylene glycol to obtain a completely transparent solution, then add 6mL of ethanol, stir for 10min, and place 1.5×1cm 2 The carbon cloth was immersed in the solution for 3 h, and then dried in an oven at 60 °C for 10 min to form a bismuth oxide seed layer. The immersion-drying step was repeated 3 times, thereby achieving uniform modification of bismuth oxide.

[0052] c: Dissolve 1g of bismuth nitrate and 0.5g of silver nitrate in 17mL of ethylene glycol to obtain a completely transparent solution, then add 34mL of ethanol and stir well; The carbon cloth was soaked in an autoclave, and after hydrothermal growth at 160°C for 6 hours, the carbon clot...

Embodiment 2

[0062] 1). Synthesis of cobalt-doped layered bismuth oxide (nanosheet array electrode) supported on foamed copper:

[0063] a: Wash the appropriately cut foam copper in ethanol, 35% dilute sulfuric acid, and deionized water for half an hour, take it out and dry it.

[0064] b: 10 mg of bismuth nitrate was dissolved in 3 mL of ethylene glycol, the copper foam was immersed in the solution for 1 h, and then dried in an oven at 60° C. for 10 min to form a bismuth oxide seed layer. The immersion-drying step was repeated 3 times to achieve uniform modification of bismuth oxide.

[0065] c: Dissolve 1.5g of bismuth nitrate and 1g of cobalt chloride in a mixed solution of 17mL of ethylene glycol and 34mL of ethanol (of course, ethanol can also be added later), and transfer the mixed solution to an autoclave. Soak the copper foam modified with bismuth oxide in a high-pressure reactor, take it out after hydrothermal growth at 150°C for 5 hours, rinse with water and ethanol to remove ot...

Embodiment 3

[0071] 1). Synthesis of carbon paper-supported copper-doped layered bismuth oxide (nanosheet array electrode):

[0072] a: Soak the properly cut carbon paper in 0.5mol / L potassium permanganate solution for half an hour, take it out, clean it with deionized water and dry it.

[0073] b: Dissolve 30mg of bismuth nitrate in 6mL of ethanol, after stirring for 10min, put 1.5×1cm 2 The carbon paper was immersed in the solution for 2 h, and then dried in an oven at 60 °C for 10 min to form a bismuth oxide seed layer. The immersion-drying step was repeated 3 times to achieve uniform modification of bismuth oxide.

[0074] c: Dissolve 1g of bismuth nitrate and 0.5g of copper sulfate in a mixed solution of 15mL of ethylene glycol and 30mL of ethanol, and stir evenly; In the kettle, after hydrothermal growth at 160°C for 8 hours, take it out, rinse with water and ethanol to remove surface residues, and dry at 80°C.

[0075] 2). Carbon paper-supported copper-doped layered bismuth oxide...

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Abstract

The invention discloses a preparation method of a metal-doped bismuth layered oxide. The method comprises the steps of soaking a conductive substrate in a bismuth precursor solution and drying to obtain a conductive substrate modified with a bismuth oxide seed layer; and soaking the conductive substrate modified with the bismuth oxide seed layer in a bismuth precursor solution containing heteroatoms, and and synthesizing the metal-doped bismuth layered oxide with a nanosheet array structure on the conductive substrate through a hydrothermal method. The invention also discloses application of the metal-doped bismuth layered oxide in electrocatalytic reduction of CO2. The metal-doped bismuth layered oxide prepared by the invention is more stable in structure and performance, has a honeycomb nanosheet array structure, can provide a large electrochemical active area, and can promote enrichment and reduction of CO2 on the surface of an electrode and improve the current density when being used as a cathode catalyst in a reaction of electrocatalytic reduction of CO2.

Description

technical field [0001] The invention relates to the technical field of synthesis and application of nanomaterials, in particular to a method for preparing a metal-doped bismuth layered oxide and its application in the electrocatalytic reduction of CO 2 in the application. Background technique [0002] The rapid development of the current industry, which uses fossil fuels as the main energy source, makes the greenhouse gas CO 2 In a short period of time, a large amount of gas is discharged into the atmosphere, causing serious damage to the ecological environment of the earth. effectively converts CO 2 Conversion into value-added chemicals is one of the important ways to address CO2 emissions while also alleviating the growing shortage of non-renewable fossil fuels. Using electrochemical methods to achieve CO 2 The transformation is recognized as the most gentle, efficient and green method. in CO 2 In the field of electrocatalysis, formate (or formic acid) is one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J23/68B01J23/843B01J35/10B01J37/02B01J37/10B01J32/00B82Y30/00B82Y40/00C25B3/07C25B3/26C25B11/091
CPCB01J23/681B01J23/8437B01J23/18B01J37/0201B01J37/10B82Y30/00B82Y40/00B01J35/33B01J35/61
Inventor 段昊泓栗振华周华郭新月孔祥贵
Owner TSINGHUA UNIV
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