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Bismuth-based catalyst for electrocatalytic CO2 reduction to form formic acid and preparation method and application thereof

A catalyst and electrocatalysis technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of heavy metal material biotoxicity, difficulty in putting materials into use, environmental pollution reaction efficiency, etc., achieve large unsaturation, rich surface catalytic activity site, effect of promoting interaction

Active Publication Date: 2019-03-26
SUZHOU UNIV
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Problems solved by technology

Although some metal materials that exist at this stage can be used for CO 2 Catalytic reduction produces formic acid, but due to the biological toxicity of heavy metal materials, environmental pollution and low reaction efficiency, this type of material is difficult to be widely used

Method used

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  • Bismuth-based catalyst for electrocatalytic CO2 reduction to form formic acid and preparation method and application thereof
  • Bismuth-based catalyst for electrocatalytic CO2 reduction to form formic acid and preparation method and application thereof
  • Bismuth-based catalyst for electrocatalytic CO2 reduction to form formic acid and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1: solution synthesis method prepares metal bismuth catalyst

[0069] Dissolve 100 mg of polyvinylpyrrolidone in 10 mL of ethylene glycol and 0.1 mL of deionized water. At room temperature, 75mg C 6 h 9 BiO 6 Add to the above solution, and form a uniformly dispersed solution under the assistance of ultrasound for 1 min. Subsequently, the temperature of the above reaction solution was rapidly raised to 195 o C, and maintained at this temperature for 15 min under magnetic stirring and nitrogen protection. The reaction was then quenched by adding 25 mL of ethanol and 10 mL of deionized water. After the reaction, the solid product was collected by centrifugation, washed at least three times with absolute ethanol and deionized water, and vacuum freeze-dried to obtain a solid sample of bismuth oxide nanotubes. Finally, bismuth oxide nanotubes were placed in air at 300 o Calcined at C for 1 h to remove possible residual organic matter on the surface to obtain...

Embodiment 2

[0076] Example 2: Preparation of two-dimensional bismuth nanosheets by liquid phase exfoliation

[0077] Weighed 800 mg of bismuth powder and added it to 80 mL of N-methylpyrrolidone (NMP) to obtain a mixed solution. The probe was ultrasonicated for 4 h at a power of 900 W in a sealed condition, and the temperature was kept at 5 during the whole probe ultrasonication process. o c. Immediately after the stripping was completed, the stripping solution was transferred to three centrifuge tubes (the volume of each tube was about 27 mL), and centrifuged at 1500 rpm for 2 h respectively. h, Vacuum freeze-drying to obtain two-dimensional bismuth nanosheets.

[0078] The morphology in the SEM photo of the obtained bismuth nanosheets is an irregular sheet structure. Further use of TEM can be observed: After the exfoliation, a small amount of smaller-sized bismuth nanoparticles were simultaneously generated, with a particle size of about 10 nm. AFM characterization test results show...

Embodiment 3

[0081] Embodiment 3: Electrospinning technology prepares Bi 2 o 3 Nanofibers

[0082] Weigh 1 gram of polyacrylonitrile (PAN) powder and dissolve it in N,N-dimethylformamide solution to make a solution with a mass concentration of 10 wt%, and then add 0.1g BiCl 3 Slowly add in the above solution, and keep stirring until the solution is evenly mixed to obtain a precursor solution containing bismuth salt and polyacrylonitrile polymer (Bi 3+ = 0.5 mol / L). Transfer the prepared precursor solution to a 10 mL syringe, and fix the syringe on the micropump injector. The needle of the syringe is connected to the positive pole of the high-voltage direct current power supply, and the collecting plate covered with aluminum foil is connected to the negative pole of the high-voltage direct current power supply. Control the injection speed to 1 mL / h, and set the positive pressure to 15 kV. Composite nanofibers of bismuth salt and polyacrylonitrile can be collected by using electrospinni...

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Abstract

The invention provides a bismuth-based catalyst for electrocatalytic CO2 reduction to form formic acid and a preparation method and application of the bismuth-based catalyst. In a water phase system,the bismuth catalyst has the characteristic of electrocatalytic CO2 reduction, and is superior to similar formic acid producing electrode materials in activity and selectivity. Compared with bulk bismuth metal, the bismuth-based catalyst with a nanometer structure is larger in specific surface area and has rich surface chemical reaction sites, specific exposed crystal faces and diversified size effects, thereby being better in catalytic activity as shown in an electrocatalytic CO2 reduction system. The nanometer-bismuth-based catalyst is environmentally friendly, low in cost, efficient and stable, the conversion efficiency of electrocatalytic CO2 reduction to form the formic acid through the nanometer-bismuth-based catalyst can be up to more than 98%, and the nanometer-bismuth-based catalyst has important practical significance for environmental protection and resource utilization.

Description

technical field [0001] The invention belongs to electrochemical reduction of CO 2 The field of catalysis, specifically related to the application of bismuth-based materials in the electrocatalytic reduction of CO 2 The reaction to form formic acid, especially involving the electrocatalytic reduction of CO 2 Bismuth-based catalyst for generating formic acid, its preparation method and application. Background technique [0002] Energy is an important material basis for human survival and development. The progress of human society is closely related to the emergence of high-quality energy and the use of advanced energy technology. In recent years, the acceleration of the global industrialization process has made CO 2 Emissions are showing an obvious upward trend, which has already caused a great threat to the global ecological environment. How to reduce CO in the atmosphere 2 The recovery and conversion of waste into various organic compounds or chemical fuels is one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B3/04C25B3/25
CPCC25B11/04C25B3/25
Inventor 李彦光韩娜
Owner SUZHOU UNIV
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