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Preparation method and electrocatalytic application of chitosan/ordered mesoporous carbon electrode material

A technology of electrode material and mesoporous carbon, which is applied in the direction of electrodes, electrolytic components, electrolytic process, etc., to achieve the effect of green and easy-to-obtain raw materials and high utilization rate of reactive atoms

Active Publication Date: 2022-07-08
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently, there is no research on chitosan / ordered mesoporous carbon electrode materials for electrocatalytic CO 2 Related technologies and literature reports on the preparation of cyclic carbonates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] a. Preparation of ordered mesoporous carbon

[0024] Triblock copolymer F127 was mixed with xylose and 98% sulfuric acid in a mass ratio of 1:1:0.6746, reacted at 140 ° C for 24 h, the reaction solution was washed with ethanol suction filtration, and dried to obtain a brown solid , the brown solid was calcined in a tube furnace under nitrogen atmosphere. The heating program is as follows: at a heating rate of 1 °C / min, the temperature is raised from room temperature to 350 °C for 2 h, and then the temperature is raised to 550 °C and maintained for 2 h. After calcination, the obtained product is an ordered intermediate. Porous carbon.

[0025] b. Preparation of chitosan / ordered mesoporous carbon electrode materials

[0026] Mix chitosan and distilled water with pH=1 in a mass-to-volume ratio of 0.5 g: 1 L, marked as solution A for use; mix ordered mesoporous carbon and ethanol in a mass-to-volume ratio of 1 g: 0.2 L, marked as Standby for solution B. Add solution A t...

Embodiment 2

[0028] a. Preparation of modified electrodes

[0029] The chitosan / ordered mesoporous carbon electrode material prepared in the above Example 1 was mixed with a binder according to 40 mg: 148 µL, then coated on both sides of carbon paper and dried at room temperature to make 2 cm × 1.8 cm rectangular solid electrode. Above-mentioned binder is sodium carboxymethyl cellulose aqueous solution, and its mass concentration is 1%.

[0030] b. Electrolytic reaction

[0031] Put 0.0015 mol of propylene oxide with 0.3857 g of the supporting salt tetraethylammonium iodide and 15 mL of acetonitrile into a one-chamber electrolytic cell. Under normal pressure, pass CO into the above electrolyte 2 to saturation at 2.78 mA / cm 2 The electrocatalytic reaction of propylene oxide and carbon dioxide was carried out at a constant current density of 25 °C, the electrolysis temperature was 25 °C, and the electrolysis power was 1.0 F per mole of propylene oxide, and F was the Faraday constant.

...

Embodiment 3

[0037] a. Preparation of ordered mesoporous carbon

[0038] Same as step a in Example 1.

[0039] b. Preparation of chitosan / ordered mesoporous carbon electrode materials

[0040] Mix chitosan with distilled water with pH=1 at a mass-volume ratio of 1 g: 1 L, and mark it as solution A for use. The ordered mesoporous carbon was mixed with ethanol at a mass-to-volume ratio of 1 g:0.2 L, which was marked as solution B for use. Add solution A to solution B dropwise, followed by 1 mL of N 2 H 4 After stirring and mixing, the reaction was carried out at 80 °C for 24 h. The reaction solution was centrifuged, washed and dried to obtain a chitosan / ordered mesoporous carbon electrode material.

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Abstract

The invention discloses a preparation method and electrocatalytic application of a chitosan / ordered mesoporous carbon electrode material. The ordered mesoporous carbon is obtained by high temperature calcination; then the abundant and cheap natural biopolymer chitosan is grafted onto the ordered mesoporous carbon to prepare the chitosan / ordered mesoporous carbon metal-free electrode material, which is used in the reaction of epoxy compounds with carbon dioxide to prepare cyclic carbonates. Compared with the prior art, the present invention has the advantages that the electrode material does not involve heavy metals and precious metals, the synthesis reaction process of the cyclic carbonate does not involve high temperature and high pressure, the electrode material is easy to be recycled and reused, the utilization rate of reactive atoms is high, and the raw materials are green and easy to obtain. the greenhouse gas CO 2 It has the advantages of effective utilization and the like, and is a promising electrode material.

Description

technical field [0001] The invention relates to the technical field of electrochemical organic synthesis, in particular to a preparation method of a chitosan / ordered mesoporous carbon electrode material and an application of electrocatalytic synthesis of cyclic carbonate. Background technique [0002] Since the Industrial Revolution, the burning of fossil fuels has caused the world to emit more than 30 billion tons of carbon dioxide every year. The increase in the concentration of carbon dioxide in the atmosphere not only has a major impact on the global climate, but it can also lead to significant changes in our ecosystems. But it is also a renewable, non-toxic, low-cost, and ideal C1 raw material (Chen J, Jin B, Dai w, et al. Catalytic fixation of CO 2 to cyclic carbonates overbiopolymer chitosan-grafted quarternary phosphonium ionic liquid as arecylablecatalyst[J]. Applied Catalysis A: General 2014 484 26–32.). With the rapid consumption of fossil fuels and the foresee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/095C25B3/05C25B3/20
CPCC25B3/00
Inventor 王欢张婧杰刘玉婷杨丽荣师怡侯悦陆嘉星
Owner EAST CHINA NORMAL UNIV
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