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A copper/silver-based electrode based on a conductive bacterial cellulose composite film

A bacterial cellulose and composite electrode technology, which is applied in battery electrodes, organic compound/hydride/coordination complex catalysts, circuits, etc., can solve the problem of reduced efficiency, inability to tightly combine catalysts and substrate materials, and no nano-network structure To achieve the effect of increasing the contact specific surface area, improving Faraday efficiency, and multiple catalytic active sites

Active Publication Date: 2021-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the electrode substrate materials used for the electrochemical catalytic reduction of carbon dioxide are carbon paper, carbon cloth, carbon sheet, carbon felt and other materials with certain conductive properties. These carbon-based materials do not have a nano-network structure, and the catalyst cannot enter the interior of the substrate material. Composite with it efficiently; the current preparation method for the electrochemical catalytic reduction of carbon dioxide is the coating method, that is, the catalyst is coated on the substrate material. This method cannot make the catalyst and the substrate material tightly composite, and it is easy to make the catalyst Falling into the electrolyte solution, causing a drop in efficiency

Method used

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  • A copper/silver-based electrode based on a conductive bacterial cellulose composite film
  • A copper/silver-based electrode based on a conductive bacterial cellulose composite film
  • A copper/silver-based electrode based on a conductive bacterial cellulose composite film

Examples

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Effect test

Embodiment 1

[0062] The copper-based electrode for electrochemical catalysis in this example is composed of a static in-situ cultured CNT@BC composite film loaded nano-copper electrode. The electrode is synthesized by an in-situ catalytic reduction method, and its preparation method is as follows:

[0063] (1) With Acetobacter xylinum as the strain (Komagataeibacter xylinusATCC23770, the same below), adding molar concentrations of 0.05M, 0.1M, 0.2M carbon nanotubes (industrial grade multi-walled carbon nanotubes, >90%, inner diameter: 5- 15nm, outer diameter: >50nm, length: 10-20 μ m, 50g, Aladdin Reagent (Shanghai) Co., Ltd., other examples are the same) respectively with fermentation medium (50g / L glucose, C 6 h 12 o 6 , AR, Sinopharm Reagent Co., Ltd.; 5g / L tryptone, BR, Sinopharm Reagent Co., Ltd.; 3g / L yeast powder, BR, Sinopharm Reagent Co., Ltd., the same below) mixed solution (in-situ static constant temperature culture 2 -3 days, take out the CNT@BC composite membrane and place ...

Embodiment 2

[0076] The silver-based electrode used for electrochemical catalysis in this embodiment is composed of a CNT@BC composite film supported by a dynamic in-situ cultured nano-copper electrode. The electrode is synthesized by an in-situ catalytic reduction method, and its preparation method is as follows:

[0077] (1) With Acetobacter xylinum as the strain, add 200 mL of a mixed solution of carbon nanotubes and medium with a concentration of 0.1M in a horizontal drum reactor, add two drops of Tween 80 as a dispersant with a rubber dropper, and mix well Cultivate for 24h. In the aseptic workbench, continue to add 200ml of 0.1M CNT and fermentation broth mixed medium into the glass fermenter through a peristaltic pump for subsequent fermentation and culture for 24 hours. Take out the CNT@BC composite membrane and place it in sodium hydroxide solution, treat it at 80°C for 2-4 hours, take it out, rinse it with deionized water until neutral, and obtain the CNT@BC composite membrane. ...

Embodiment 3

[0083] The copper-based electrode used for electrochemical catalysis in this example is composed of impregnated and cultured CNT@BC composite film loaded nano-copper electrode. The electrode is synthesized by in-situ catalytic reduction method, and its preparation method is as follows:

[0084] (1) Use Acetobacter xylinum as the bacterial species, prepare bacterial cellulose pure film by static culture for 2-4 days, take out the pure film and place it in sodium hydroxide solution, treat it at 80°C for 2-4h, take it out, and use it The pure BC membrane was obtained after rinsing with deionized water to neutrality.

[0085] (2) The pure BC membrane was dynamically impregnated with a carbon nanotube aqueous solution with a concentration of 0.1M, oscillated dynamically in a constant temperature oscillator at 30°C for 24 hours, and the CNT@BC composite membrane was obtained after taking it out. Multi-walled carbon nanotubes can be dispersed for 30 minutes with an ultrasonic cleanin...

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Abstract

The invention relates to a copper / silver-based electrode with a conductive bacterial cellulose composite film as a substrate. The composite film is used as a substrate for the electrode, and the electrode is obtained by in-situ chemical reduction, catalytic reduction or hydrothermal synthesis of Cu / Ag ions. Compared with the traditional electrode based on carbon cloth, the catalytic electrode prepared by the present invention has a three-dimensional nanofiber network structure, high specific surface area and high electrical conductivity, so it has higher catalytic efficiency and longer electrode life. The preparation method is green and environment-friendly, has simple process and short preparation time. The electrode has good application prospects in the fields of electrocatalytic reduction of carbon dioxide, fuel cells, photocatalysis, biocatalysis, etc., and is of great significance to environmental protection and energy recycling.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a copper / silver-based electrode with a conductive bacterial cellulose composite film as the base. Background technique [0002] Bacterial nanocellulose (BC) is a kind of cellulose produced by microorganisms. Bacterial nanocellulose has excellent mechanical properties, low density and perfect 3D network structure. As a new material, bacterial nanocellulose is widely used in textiles. , medical, food, and conductive materials, compared with synthetic polymers, bacterial nanocellulose not only has good mechanical properties but also has renewable properties. [0003] With the outbreak of the industrial revolution, human beings demand and use fossil fuels more and more, which leads to the shortage of resources on a global scale and the greenhouse effect caused by carbon dioxide, which leads to a series of environmental problems, such as rising sea levels, melting glaciers, etc. . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08J5/18C08L1/02C08L79/02C08L79/04C08K3/04H01M4/88H01M4/90B01J31/06B01J23/72B01J23/50B01J21/18B01J35/06
CPCC08J9/40C08J5/18H01M4/9041H01M4/8803H01M4/8825B01J31/06B01J23/72B01J23/50B01J21/185B01J35/0033B01J35/004B01J35/0013B01J35/065B01J35/002C08J2301/02C08J2479/02C08J2479/04C08K2201/011C08K3/041C08K3/042C08K2201/001Y02E60/50
Inventor 洪枫高璐陈琳聂子琪李宣江乔锦丽
Owner DONGHUA UNIV
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