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Modified electrode applied to zinc-bromine redox flow battery and preparation method thereof

A technology for zinc-bromine flow batteries and modified electrodes, which can be used in battery electrodes, fuel cells, regenerative fuel cells, etc., and can solve problems such as cost increase and multiple single cells

Active Publication Date: 2016-11-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In high-power device applications, the stack requires more cells, increasing its cost

Method used

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  • Modified electrode applied to zinc-bromine redox flow battery and preparation method thereof
  • Modified electrode applied to zinc-bromine redox flow battery and preparation method thereof
  • Modified electrode applied to zinc-bromine redox flow battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Weigh 32.37 mg of chloroplatinic acid hexahydrate into 25 ml of deionized water, and oscillate ultrasonically for 2 minutes to mix the precursor solution evenly. Then take a 1cm×5cm graphite sheet, polish it with 60cw sandpaper to make the surface rough, rinse it with deionized water, and dry it. Immerse the treated graphite sheet in the precursor solution and let it stand for 20 minutes to make the precursor solution fully contact with the surface of the graphite sheet. Then, prepare 25ml of 0.0025M ascorbic acid solution, add the ascorbic acid solution drop by drop into the precursor solution soaked in graphite flakes with a rubber dropper, stop adding the reducing agent solution and let it stand for 30 minutes to make the reducing agent and the precursor solution fully reaction. The graphite sheet was then taken out and dried in vacuum at 40° C. for 12 hours to complete the preparation of a modified electrode with platinum nanoparticles on the surface.

Embodiment 2

[0018] Weigh 22.20 mg of ammonium chloropalladate in 25 ml of deionized water and oscillate ultrasonically for 2 min to mix the precursor solution evenly. Then take a 1cm×5cm graphite sheet, polish it with 60cw sandpaper to make the surface rough, rinse it with deionized water, and dry it. Immerse the treated graphite sheet in the precursor solution and let it stand for 20 minutes to make the precursor solution fully contact with the surface of the graphite sheet. Then, take 7ml of 85% hydrazine hydrate solution, add the hydrazine hydrate solution dropwise into the precursor solution soaked in graphite flakes with a rubber dropper, stop adding the reducing agent solution and let it stand for 30 minutes to make the reducing agent and the precursor The solution is fully reacted. The graphite sheet was then taken out and dried in vacuum at 40° C. for 12 hours to complete the preparation of a modified electrode with palladium nanoparticles on the surface.

Embodiment 3

[0020] Weigh 25.74 mg of chloroauric acid tetrahydrate into 25 ml of deionized water, and oscillate ultrasonically for 2 minutes to mix the precursor solution evenly. Then take a 1 cm × 5 cm carbon felt, rinse it with deionized water, and dry it under vacuum at 40 degrees Celsius. Dip the carbon felt into the precursor solution and let it stand for 20 minutes to make the precursor solution fully contact with the surface of the carbon felt fiber. Then, prepare 25ml of 0.0025M ascorbic acid solution, add the ascorbic acid solution drop by drop into the precursor solution soaked in carbon felt with a rubber dropper, stop adding the reducing agent solution and let it stand for 30 minutes to make the reducing agent and the precursor solution fully reaction. The carbon felt was then taken out, and dried under vacuum at 40° C. for 12 hours to complete the preparation of a modified electrode with gold nanoparticles modified on its surface.

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Abstract

The invention belongs to the technical field of surface treatment of electrode materials and particularly relates to a modified electrode applied to a zinc-bromine redox flow battery and a preparation method thereof. A base material of the modified electrode can be a graphite sheet or a carbon felt; noble metal nano-particles, such as noble metal nano-particles including platinum, gold, palladium and iridium, are attached on the surface of the graphite sheet or a fibrous surface of the carbon felt. The preparation method of the modified electrode is characterized by comprising the following steps of: preparing a precursor solution from acids and salts including chloroplatinic acid, chloroauric acid, ammonium chloropalladate or iridium trichloride and the like and ultrasonically vibrating for 2 minutes; then immersing the graphite sheet or the carbon felt into the precursor solution; and adding reducing agents including ascorbic acid or hydrazine hydrate and the like and reducing the noble metal nano-particles to the graphite sheet or the fibrous surface of the carbon felt from the relative precursor solution, so as to finish the preparation of the modified electrode. The invention provides the modified electrode which is simple in structure and the preparation method of the modified electrode is convenient; after the modified electrode is applied to the zinc-bromine redox flow battery, the problem that the activity of the electrode of the zinc-bromine redox flow battery is not enough can be solved.

Description

technical field [0001] The invention belongs to the technical field of electrode material surface treatment, in particular to a modified electrode applied to a zinc-bromine flow battery and a preparation method thereof. Background technique [0002] Resources and the environment will be the decisive factors that ultimately restrict the development of human society. For the sustainable development of society, the full development and utilization of renewable energy has become a very urgent requirement in today's society. The development of large-scale energy storage devices and technologies is of great significance to the utilization of new energy. Among many energy storage devices and technologies, redox flow batteries are considered to be one of the most potential large-scale electrochemical energy storage devices because of their low cost, long cycle life, flexible design, and environmental protection. Redox flow batteries mainly include the following types: iron / chromiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92H01M4/96H01M8/18
CPCH01M4/885H01M4/9083H01M4/926H01M4/96H01M8/188Y02E60/50
Inventor 王德仁冯彪孟琳张祺
Owner UNIV OF SCI & TECH BEIJING
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