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Copper/silver-based electrode taking conductive bacterial cellulose composite film as substrate

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 inability to tightly combine catalysts and substrate materials, catalysts falling into electrolyte solutions, Inability to efficiently recombine catalysts and other issues to achieve the effects of improving Faradaic efficiency, improving utilization and conversion rates, and reducing the occurrence of hydrogen evolution reactions

Active Publication Date: 2021-01-08
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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  • Copper/silver-based electrode taking conductive bacterial cellulose composite film as substrate
  • Copper/silver-based electrode taking conductive bacterial cellulose composite film as substrate
  • Copper/silver-based electrode taking conductive bacterial cellulose composite film as substrate

Examples

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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 taking a conductive bacterial cellulose composite film as a substrate, and the electrode is obtained by taking the composite film as the substrate and carrying out Cu / Ag ion in-situ chemical reduction, catalytic reduction or hydrothermal synthesis. Compared with a traditional electrode taking carbon cloth as a substrate, the catalytic electrode prepared by the invention has higher catalytic efficiency and longer electrode service life due to a three-dimensional nanofiber network structure, a high specific surface area and high conductivity. The preparation method is environmentally friendly, simple in process and short in preparation time. The electrode has good application prospects in the fields of carbon dioxide electrocatalytic reduction, fuel cells, photocatalysis, biocatalysis and the like, and has important significance in environmental protection, energy cyclic utilization and the like.

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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IPC IPC(8): C08J9/40C08J5/18C08L1/02C08L79/02C08L79/04C08K3/04H01M4/88H01M4/90B01J31/06B01J23/72B01J23/50B01J21/18B01J35/06
CPCC08J9/40C08J5/18H01M4/9041H01M4/8803H01M4/8825B01J31/06B01J23/72B01J23/50B01J21/185C08J2301/02C08J2479/02C08J2479/04C08K2201/011C08K3/041C08K3/042C08K2201/001B01J35/30B01J35/39B01J35/23B01J35/33B01J35/59Y02E60/50
Inventor 洪枫高璐陈琳聂子琪李宣江乔锦丽
Owner DONGHUA UNIV
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