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Preparation method and application of flexible catalytic material for water electrolysis

A catalytic material, a technology for electrolyzing water, applied in chemical instruments and methods, electrolysis process, electrolysis components, etc., can solve the problems of increased electron transport resistance, unstable catalytic effect, reduced catalytic activity, etc. Convenience and the effect of increasing catalytic sites

Inactive Publication Date: 2018-12-07
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the powdery catalyst is mixed and coated on the conductive carrier through the polymer binder, the electron transport resistance between the catalyst and the electrode will increase, and at the same time, some active sites of the catalyst will be covered, reducing its catalytic activity.
More importantly, these powder catalysts are easy to fall off from the carrier during the gas release process, resulting in unstable catalytic effect

Method used

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  • Preparation method and application of flexible catalytic material for water electrolysis
  • Preparation method and application of flexible catalytic material for water electrolysis
  • Preparation method and application of flexible catalytic material for water electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Preparation of Co-PBA nanoparticles

[0049] The preparation of cobalt-like Prussian blue particles (Co-PBA) includes two steps of synthesis and purification.

[0050] Accurately weigh 0.15 mmol of cobalt acetate and dissolve in 40 ml of water to obtain A solution. At the same time, 0.08 mmol of potassium hexacyanocobaltate was accurately weighed and dissolved in 40 ml of water, and PVP was added while stirring to obtain solution B. Slowly add solution A to solution B while stirring (about 10 minutes after the addition), the solution gradually changes from colorless to pink, and continue stirring for 10 minutes after all the addition is completed. The above mixture was left to stand for 4 hours, immediately washed with water and ethanol by centrifugation for several times to remove residual impurities, and then freeze-dried for future use.

[0051] 2. Preparation of Co-PB / PAN nanofiber membrane

[0052] Accurately weigh 0.584g of the above-mentioned nanoparticles ...

Embodiment 2

[0061] Referring to the method of Example 1, the proportion of Co-PB doped in the nanofiber was changed (the proportions of Co-PB and PAN were respectively 0%, 3% and 5%), and other conditions remained unchanged.

[0062] The experimental results show that the doping of cobalt-based Prussian blue analog nanoparticles in the nanofibers promotes electron transfer and mass transfer, increases the catalytic sites, and is beneficial to improve the electrocatalytic performance. The experimental results are shown in the attached Figure 4 shown.

Embodiment 3

[0064] Referring to the method of Example 1, the above-mentioned Co-based carbon nanocomposite fiber was used as the catalytic working electrode, platinum was used as the counter electrode, Ag / AgCl was used as the reference electrode, and 0.5M sulfuric acid solution was used as the electrolyte for three-electrode electrocatalytic testing.

[0065] The experimental results show that the catalyst has good electrocatalytic performance in electrolysis of water under both acidic and alkaline conditions, and the electrocatalytic hydrogen production performance under alkaline conditions is better than that under acidic conditions, and the electrocatalytic oxygen production performance under acidic conditions is better than that under acidic conditions. Better than under acidic conditions, the experimental results are as attached Figure 5 shown.

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Abstract

The invention discloses a preparation method and an application of a flexible catalytic material for water electrolysis, and belongs to the technical field of hydrogen production by water electrolysis. The preparation method comprises the following steps: (1) preparing cobalt-based Prussian blue analogue nanoparticles; (2) dispersing the cobalt-based Prussian blue analogue nanoparticles in an organic solvent, then adding polyacrylonitrile to prepare a spinning solution, and electrostatically spinning to prepare a Co-PBA / PAN composite nanofiber membrane; (3) pre-oxidizing the Co-PBA / PAN composite nanofiber membrane, and then carbonizing in an inert atmosphere to prepare the flexible catalytic material for water electrolysis. In the catalytic material for water electrolysis prepared in the invention, cobalt carbide is uniformly dispersed in porous carbon fiber, so that catalytic sites are increased. Meanwhile, the porous carbon fiber provides carriers for the catalytic sites and enhancesthe conductivity, thereby improving the problems of easy falling and loss of conventional powder catalytic materials; and a production method is easy and convenient, environment-friendly and safe, and can achieve large-area continuous production.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by electrolysis of water, in particular to a preparation method and application of a flexible electrolysis water catalytic material. Background technique [0002] Currently, the energy problem is one of the most serious problems facing the world today. Relying on fossil fuels for energy has a huge impact on the economy. Excessive use of fossil fuels not only pollutes the air, but also exacerbates global warming. Therefore, it is urgent to find clean and sustainable new energy sources to replace fossil fuels. Among various energy sources, efficient, clean, and renewable hydrogen is not only an energy source, but also a carrier for energy storage and transfer. Among them, hydrogen production by electrolysis of water is considered to be a very promising way to generate clean hydrogen fuels. [0003] For hydrogen production by electrolysis of water, the key to research is to improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/02B01J35/06C25B1/04C25B11/12B01J35/00
CPCC25B1/04B01J23/75C25B11/043B01J35/33B01J35/58B01J35/40Y02E60/36
Inventor 刘海清李蕾邝春霞翟云云王香卫
Owner JIAXING UNIV
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