for electrocatalysis 2 Bismuth-based catalyst reduced to formic acid and its preparation method and application
An electrocatalysis and catalyst technology, applied in electrodes, electrolysis components, electrolysis processes, etc., can solve the problems of environmental pollution reaction efficiency, difficult to put into use of materials, biological toxicity of heavy metal materials, etc., to promote interaction and enrich surface catalytic active sites. The effect of point, large desaturation
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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, 75 mg 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 obtai...
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 10wt%, 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 electrospinning...
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