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V-doped cuprous selenide nanosheet assembled nanotube array structure material, preparation method and application thereof

A nanotube array, cuprous selenide technology, applied in electrolytic components, electrodes, electrolytic organic production, etc., can solve problems such as poor selectivity and stability, limitations, etc., achieve low cost, improve electrical conductivity, and accelerate catalytic kinetics. Effect

Active Publication Date: 2022-05-10
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Cu2Se materials are easily reduced to Cu0 in the CO2ER process, which limits their selectivity and stability. Practical application on CO2ER

Method used

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  • V-doped cuprous selenide nanosheet assembled nanotube array structure material, preparation method and application thereof
  • V-doped cuprous selenide nanosheet assembled nanotube array structure material, preparation method and application thereof
  • V-doped cuprous selenide nanosheet assembled nanotube array structure material, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0076] A preparation method of a nanotube array structure material assembled by V-doped cuprous selenide nanosheets, comprising the following steps:

[0077] The copper foam (CF) with an area of ​​2.5×3.5cm was soaked in 6M hydrochloric acid for 15min, and then washed 3 times with deionized water and absolute ethanol. Accurately measure 30mL of deionized water in a clean small beaker, and accurately weigh 3.8mmol of ammonium persulfate ((NH 4 ) 2 S 2 o 8 ), 75mmol sodium hydroxide (NaOH) was added to the above-mentioned small beaker, magnetically stirred to form a mixed solution, the pre-treated foamed copper was dipped into the mixed solution, and reacted for 20min at room temperature, and then the foamed copper covered by the blue sample was used Wash with deionized water and absolute ethanol three times each, and dry in an oven at 70°C for 12 hours. Accurately measure 30mL of deionized water in a clean small beaker, and accurately weigh 1.5mmol of sodium borohydride (Na...

Embodiment 2

[0086] A preparation method of a nanotube array structure material assembled by V-doped cuprous selenide nanosheets, comprising the following steps:

[0087] Accurately weigh 1.5mmol sodium borohydride (NaBH 4 ), 0.3mmol Se powder, 0.15mol sodium hydroxide (NaOH) and 0.03 mmol or 0.09 mmol ammonium metavanadate (NH 4 VO 3 ), added into a small beaker with 30 mL of deionized water and stirred ultrasonically to form a reddish-brown mixed solution. Then it was transferred to a 50mL polytetrafluoroethylene-lined stainless steel reactor, and the copper foam covered with the blue precursor in Example 1 was placed obliquely into the stainless steel reactor, and reacted in an oven at 120°C for 6h. After the reaction was finished, it was naturally cooled to room temperature, and the copper foam covered by the black sample was washed three times with deionized water and absolute ethanol, and the obtained sample was dried in a vacuum oven at 70°C for 12 hours to obtain V-doped Cu 2 Na...

Embodiment 3

[0092] A V-doped Cu 2 Nanotube array structure material assembled by Se nanosheets as electrocatalytic carbon dioxide reduction reaction (CO 2 ER) catalyst application.

[0093] The specific application method is: V-doped Cu with an area of ​​0.5×0.5cm 2 The nanotube array structure material assembled by Se nanosheets was used as the working electrode, and the carbon rod and the Ag / AgCl electrode were used as the counter electrode and the reference electrode respectively in 0.1M KHCO 3 In the H-type electrolytic cell of the electrolyte solution, the CHI760E electrochemical workstation was used for testing.

[0094] The present invention prepares Cu with foam copper 2 Nanotube array structure assembled by Se nanosheets and V-doped Cu 2 The nanotube array structure assembled by Se nanosheets was used as the working electrode and assembled in an H-type electrolytic cell to measure their CO 2 ER performance for comparison. Cu prepared on foamed copper 2The preparation of th...

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Abstract

The invention discloses a nanotube array structure material assembled by V-doped cuprous selenide nanosheets as well as a preparation method and application of the nanotube array structure material. The preparation method comprises the following steps: putting foamy copper containing a copper hydroxide precursor into a mixed solution containing a selenium source, a vanadium source, a reducing agent and alkali, and carrying out hydrothermal reaction to prepare the nanotube array structural material assembled by the V-doped cuprous selenide nanosheets. Compared with the prior art, after V < 4 + > ions are doped into a nanotube array structure assembled by cuprous selenide nanosheets, electronic structures of Cu, Se and V atoms can be effectively adjusted, exposure of active sites is increased, multiple active sites are formed, the conductivity of the catalyst is improved, intermediate species and adsorption behaviors thereof are optimized, and catalytic kinetics are accelerated; the activity, the selectivity and the stability of the catalyst for electrocatalytic reduction of carbon dioxide (CO2ER) into a single liquid product ethanol are improved. In addition, the method has the characteristics of simple preparation process, environment friendliness and low cost.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation methods and electrocatalysis applications, and in particular relates to a nanotube array structure material assembled with V-doped cuprous selenide nanosheets, a preparation method and an application thereof. Background technique [0002] Excessive consumption of fossil fuels causes atmospheric carbon dioxide (CO 2 ) concentration sharply increased, bringing a series of environmental problems. Electrocatalytic carbon dioxide reduction (CO 2 ER) is a CO 2 Viable and efficient means of conversion into valuable fuels and chemicals for recycling. Due to CO 2 Due to the limited solubility of molecules in water and the high thermodynamic stability of C=O bonds, most catalysts have problems such as low current density and poor selectivity in the electrocatalytic reduction process. Electrocatalytic carbon dioxide reduction (CO 2 Advances in ER) technology require the preparation of electrocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B3/07C25B3/26
CPCC25B11/091C25B3/07C25B3/26Y02E60/36
Inventor 吴正翠孙卫培高峰
Owner ANHUI NORMAL UNIV
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