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Bamboo-wood-based gas diffusion catalytic electrode and application thereof

A catalytic electrode and gas diffusion technology, which is applied in the field of catalysis, can solve the problems of increasing electrode impedance, not being able to realize the utilization of the original structure of biomass, and increasing binders, etc., and achieve simple preparation methods, high-current carbon dioxide electrolysis, and wide application foreground effect

Pending Publication Date: 2021-12-24
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of traditional biomass utilization method only involves the recycling of carbon elements, but cannot realize the utilization of the original structure of biomass, and will also increase the electrode impedance and increase the cost of using expensive reagents such as binders.

Method used

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  • Bamboo-wood-based gas diffusion catalytic electrode and application thereof
  • Bamboo-wood-based gas diffusion catalytic electrode and application thereof
  • Bamboo-wood-based gas diffusion catalytic electrode and application thereof

Examples

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Effect test

preparation example Construction

[0027] Reference manual attached figure 1 , a method for preparing a bamboo-wood-based gas diffusion catalytic electrode, comprising the steps of:

[0028] Step 1: Dissolve the metal salt in water, fully immerse the bamboo and wood material, remove the water by heating at low temperature after taking it out, and obtain the bamboo and wood precursor; preferably, take out the bamboo and wood material from the metal salt solution and remove the impregnated bamboo and wood material. The metal solution residue on the outer surface of the wood material can prevent the metal load on the outer surface of the bamboo and wood material from being too high. Wherein, in the catalytic electrode, the thickness of the bamboo and wood raw material is 1-4 cm. When the thickness is too low, the reaction area is too small, which is not conducive to the increase of the electrolysis current; when the thickness is too high, the lateral mass transfer rate will limit the reaction rate of the outer are...

Embodiment 1

[0040] A preparation method of a bamboo-wood-based gas diffusion catalytic electrode, comprising the following steps:

[0041] Step 1: Immerse dried bamboo wood in copper nitrate solution, the mass ratio of bamboo wood material to copper nitrate is 10:1, after soaking overnight, take it out, and heat at 353K for 6 hours to obtain the precursor;

[0042] Step 2: Place the precursor in a tube furnace, and perform a high-temperature heating reaction in an ammonia atmosphere: raise the temperature to 673K ​​at a rate of 2K / min, keep the temperature constant for 2h, then continue to heat up to 1073K, and keep the temperature constant for 1h; when cooling down, First cool down to 573K at a rate of 2K / min, and then cool naturally to room temperature to obtain bamboo and wood-based biomass materials;

[0043] Step 3: immerse the bamboo and wood biomass material in 10% PTFE solution, and sonicate for 10s. After taking it out, the material was placed in a tube furnace and heated at a l...

Embodiment 2

[0045] A preparation method of a bamboo-wood-based gas diffusion catalytic electrode, comprising the following steps:

[0046] Step 1: Immerse dried bamboo and wood in nickel nitrate solution, the mass ratio of bamboo and wood material to nickel nitrate is 100:1, after soaking overnight, take it out, and heat at 353K for 6 hours to obtain the precursor;

[0047] Step 2: Place the precursor in a tube furnace, and perform a high-temperature heating reaction in an ammonia atmosphere: raise the temperature to 673K ​​at a rate of 2K / min, keep the temperature constant for 2h, then continue to heat up to 1073K, and keep the temperature constant for 1h; when cooling down, First cool down to 573K at a rate of 2K / min, and then cool naturally to room temperature to obtain bamboo and wood-based biomass materials;

[0048] Step 3: immerse the bamboo and wood biomass material in 10% PTFE solution, and sonicate for 10s. After taking it out, the material was placed in a tube furnace and heat...

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Abstract

The invention discloses a bamboo-wood-based gas diffusion catalytic electrode and application thereof. The catalytic electrode comprises bamboo-wood-based biomass, a metal catalytic active component and a hydrophobic component, the loading amount of metal of the catalytic electrode is 0.1%-5%, and the size of the metal is 0.1-100 nm; a material main body of the electrode is derived from bamboo biomass, and the bamboo biomass is subjected to surface functionalization treatment to be hydrophobic. According to the gas diffusion catalytic electrode, in the reaction of electrocatalytic carbon dioxide reduction, sufficient mass transfer of carbon dioxide gas can be carried out by utilizing a porous channel structure of bamboo, so that the limitation that carbon dioxide is low in solubility and slow in mass transfer in water is broken, and reaction intermediate products can be enriched on the basis of confinement pore channels.

Description

technical field [0001] The present invention relates to the field of catalysis. More specifically, it relates to a bamboo wood-based gas diffusion catalytic electrode for electrolysis of carbon dioxide and its application in electrolysis of carbon dioxide. Background technique [0002] Use valley electricity or waste electricity to drive carbon dioxide electrolysis to realize the resource conversion of greenhouse gas carbon dioxide. Carbon dioxide resource conversion products can be carbon monoxide and various carbon-containing organic substances, which can be used as people's daily necessities and industrial production raw materials. [0003] By exposing carbon dioxide in an aqueous solution, dissolved carbon dioxide can undergo an electrochemical reduction reaction on the surface of the catalytic electrode. Due to the extremely low solubility of carbon dioxide in water (33 mmol / L at normal temperature and pressure), the mass transfer is also limited. Conventional water pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/032C25B11/065C25B11/091C25B3/26
CPCC25B11/032C25B11/065C25B11/091C25B3/26
Inventor 谢佳芳赵全保郑煜铭俞汉青
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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