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Nanowire structure copper/cuprous sulfide/copper mesh electrode material and preparation method and application thereof

An electrode material, cuprous sulfide technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the limitations and other problems, and achieve the effect of lower energy barrier, good conductivity, and large electrochemical active surface area

Active Publication Date: 2022-04-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for Cu + / Cu 0 Site studies are limited to oxygen-modified copper-based catalysts

Method used

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  • Nanowire structure copper/cuprous sulfide/copper mesh electrode material and preparation method and application thereof
  • Nanowire structure copper/cuprous sulfide/copper mesh electrode material and preparation method and application thereof
  • Nanowire structure copper/cuprous sulfide/copper mesh electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A. Preparation of copper hydroxide / copper mesh.

[0046] Cut the commercially available copper mesh with a mesh size of 200 to 3×4cm 2 Slices of different sizes were ultrasonically cleaned with absolute ethanol and deionized water for 5 min, respectively, and dried in an oven at 60°C for later use. Weigh 5.00g of sodium hydroxide and 1.14g of ammonium persulfate and dissolve them in 50mL of deionized water, stir to dissolve completely to obtain a mixed solution, place the pretreated copper mesh substrate in the mixed solution, take it out after 10min Dry it in an oven at 60°C for later use to obtain Cu(OH) 2 / CM, where Cu(OH) 2 It is a nanorod array structure with smooth surface.

[0047] B. the Cu(OH) obtained in step A 2 / CM is placed in a porcelain boat, weigh 5.26g of thioacetamide and place it in a porcelain boat, place thioacetamide in the upstream of the nitrogen flow, Cu(OH) 2 / CM is placed downstream of the nitrogen flow, the set temperature is 150°C, and ...

Embodiment 2

[0050] A. Cut the commercially available copper mesh with a mesh size of 200 mesh to 3×4cm 2 Slices of different sizes were ultrasonically cleaned with absolute ethanol and deionized water for 5 min, respectively, and dried in an oven at 60°C for later use. 2.50 g of sodium hydroxide and 0.93 g of ammonium persulfate were weighed and dissolved in 50 mL of deionized water, and stirred to completely dissolve to obtain a mixed solution. Place the pretreated copper grid substrate in the mixed solution, take it out after 20 min, rinse it with deionized water, and dry it in an oven at 60°C for later use to obtain Cu(OH) 2 / CM, where Cu(OH) 2 It is a nanorod array structure with smooth surface.

[0051] B. the Cu(OH) obtained in step A 2 / CM is placed in a porcelain boat, weigh 5.26g of thioacetamide and place it in a porcelain boat, place thioacetamide in the upstream of the nitrogen flow, Cu(OH) 2 / CM is placed downstream of the nitrogen flow, the set temperature is 140°C, and ...

Embodiment 3

[0054] A. Cut the commercially available copper mesh with a mesh size of 200 mesh to 3×4cm 2 Slices of different sizes were ultrasonically cleaned with absolute ethanol and deionized water for 5 min, respectively, and dried in an oven at 60°C for later use. 4.0 g of sodium hydroxide and 1.0 g of ammonium persulfate were weighed and dissolved in 50 mL of deionized water, stirred to completely dissolve to obtain a mixed solution. Place the pretreated copper grid substrate in the mixed solution, take it out after 20 min, rinse it with deionized water, and dry it in an oven at 60°C for later use to obtain Cu(OH) 2 / CM, where Cu(OH)2 It is a nanorod array structure with smooth surface. .

[0055] B. the Cu(OH) obtained in step A 2 / CM is placed in a porcelain boat, weigh 5.26g of thioacetamide and place it in a porcelain boat, place thioacetamide in the upstream of the nitrogen flow, Cu(OH) 2 / CM is placed downstream of the nitrogen flow, at 1°C min -1 The heating rate was inc...

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Abstract

The invention provides a preparation method and application of a nanowire-structured copper / cuprous sulfide / copper mesh electrode material, the method takes a copper mesh as a substrate, cuprous sulfide nanorods grow on the copper mesh substrate by chemical oxidation and gas phase vulcanization methods to obtain an electrode material, and the electrode material is subjected to electrochemical reduction to obtain the nanowire-structured copper / cuprous sulfide / copper mesh electrode material. A copper / cuprous sulfide nanowire / copper mesh electrode is formed, and the surface chemistry is shown as Cu / Cu2S / CM; wherein Cu / Cu2S is of a nanowire net structure. The material is characterized in that the copper / cuprous sulfide nanowires grown on the copper mesh are uniformly distributed, and the copper / cuprous sulfide nanowires have abundant elemental copper and cuprous sulfide interfaces. The electrode material is used for generating ethanol through electrocatalytic reduction of carbon dioxide and has good catalytic performance, and under the overpotential of-0.8 V (vs RHE, relative to a reversible hydrogen electrode), the initial current can reach 12.8-13.5 mA cm <-2 >, the selectivity of ethanol reaches 9.8-13.8%, the yield of ethanol reaches 982.5-987.3 [mu] mol.L <-1 >. H <-1 >, and the double-electric-layer capacitance value of the electrode reaches 19.18-20.50 mF cm <-1 >.

Description

Technical field: [0001] The invention relates to an electrode material for electrocatalytic reduction of carbon dioxide to generate ethanol, in particular to a preparation method and application of a nanowire-structured copper / cuprous sulfide / copper mesh. Background technique: [0002] At present, the reduction of carbon dioxide is a hot spot in scientific research. Among them, the electrochemical reduction of carbon dioxide has attracted extensive attention from researchers because of its mild reaction conditions and the required energy can be provided by renewable energy such as wind energy and tidal energy. The products of electrochemical reduction of carbon dioxide, such as carbon monoxide, methane, methanol, formic acid, ethylene, ethanol, etc., have higher energy density and value than carbon dioxide. In addition, CO2 electroreduction can contribute to the mitigation of environmental pollution problems caused by CO2. However, the electrochemical reduction of carbon di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/07C25B3/26C25B11/061C25B11/056C25B11/091
CPCC25B3/07C25B3/26C25B11/061C25B11/056C25B11/091
Inventor 雷晓东窦彤王一平杜嘉玮何锦清
Owner BEIJING UNIV OF CHEM TECH
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