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A kind of nano-bismuth/carbon composite material and preparation method thereof

A carbon composite material, nano-bismuth technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as the inability to guarantee the uniform distribution of bismuth, the inability to guarantee effective suppression, and the inability to guarantee the distribution of bismuth. , to achieve the effects of low cost, simple operation, and inhibition of hydrogen evolution reaction

Inactive Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, direct mixing of bismuth powder undoubtedly cannot ensure the uniform distribution of bismuth in the zinc anode, and since the zinc in the anode undergoes the transformation of zinc-zincate ion-zinc oxide or zinc hydroxide during charge and discharge, it is impossible for zinc-bismuth alloys to Therefore, these methods cannot guarantee the distribution of bismuth in the electrode, let alone its effective inhibition of the hydrogen evolution reaction on the surface of carbon particles.

Method used

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  • A kind of nano-bismuth/carbon composite material and preparation method thereof
  • A kind of nano-bismuth/carbon composite material and preparation method thereof
  • A kind of nano-bismuth/carbon composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0047] (1) Add 100 ml of deionized water to a 250 ml beaker, then dissolve 1.2 g of sodium hydroxide, add 4.8 g of disodium ethylenediamine tetraacetate, ultrasonicate for 40 minutes at a frequency of 20 KHz, and then use 500 rpm at 35 Stir to dissolve,

[0048] (2) Add 2.32g of bismuth nitrate, ultrasonically obtain a clear solution for 30 minutes at a frequency of 25KHz, then add 3g of conductive carbon black, then stir for 2 hours so that the carbon powder is evenly dispersed, and finally remove the aqueous solution by suction filtration,

[0049] (3) The obtained solid was vacuum-dried at 60° C. for 12 hours, and then calcined in an argon atmosphere at 280° C. for 30 minutes. The resulting sample was redispersed in water at 30°C, and 50ml of 3g L -1 aqueous sodium borohydride solution. After the dropwise addition was completed, reacted for 3 minutes, and the reaction solution was quickly suction-filtered, and then washed repeatedly with deionized water and ethanol to obt...

Embodiment 2

[0054] Add 40 ml of propylene glycol to a 100 ml beaker, add 2.6 g of disodium edetate, ultrasonicate for 30 minutes at a frequency of 25 KHz, then stir at 600 rpm for 30 minutes to dissolve, add 0.8 g of bismuth chloride, Ultrasound at 25KHz frequency for 30 minutes to obtain a clear solution, then add 1g of carbon fiber, and then stir for 1.5 hours to disperse the carbon powder evenly, and finally filter to remove the solution, vacuum dry the obtained solid at 70°C for 10 hours, and then calcinate it in a nitrogen atmosphere at 350°C 40 minutes. The obtained sample was redispersed in water at 30°C, and 40ml of 1.5g L -1 Sodium borohydride solution in isopropanol. After the dropwise addition, react for 2 minutes, and quickly filter the reaction solution with deionized water and ethanol to wash repeatedly to obtain the final product. In the final product, the particle size of bismuth is 15-40nm.

[0055] Hydrogen evolution overpotential comparison: Take 0.1g of this product...

Embodiment 3

[0057] Add 120ml of deionized water to a 250ml beaker, add 3.8g of sodium alginate, ultrasonicate at 28KHz for 20 minutes, then stir at 700 rpm for 30 minutes to dissolve, add 2.1g of bismuth nitrate, Ultrasound for 30 minutes to obtain a clear solution, and ultrasonic for 40 minutes to obtain a clear solution, then add 2.4g of carbon nanotubes, and then stir for 2.5 hours to disperse the carbon powder evenly, and finally remove the aqueous solution by suction filtration, and vacuum dry the obtained solid at 60°C for 14 hours , Calcined at 330°C for 30 minutes in an argon atmosphere. The obtained sample was redispersed in water at 30°C, and 30ml of 2gL was slowly added dropwise under electromagnetic stirring -1 aqueous sodium borohydride solution. After the dropwise addition, react for 2 minutes, and quickly filter the reaction solution with deionized water and ethanol to wash repeatedly to obtain the final product. In the final product, the particle size of bismuth is 10-20...

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Abstract

The invention relates to a nanometer composite material, in particular to a nanometer bismuth / carbon composite material and a preparation method thereof. A nanometer bismuth and carbon compound is obtained by taking various carbon materials as a substrate, bismuth nitrate, bismuth chloride, bismuth sulfate, bismuth acetate, bismuth citrate and the like as a bismuth source, water containing an organic complexing agent, ethylene glycol, propylene glycol or other mixture as a solvent and sodium borohydride, potassium borohydride, hydrazine hydrate and the like as a reducing agent and by an absorption-thermal decomposition-reduction method. According to the method, a solution containing bismuth ions is absorbed to a surface of a carbon material, remaining solution is filtered, the bismuth oxide / bismuth and carbon compound is obtained after drying and thermal treatment, and the nanometer bismuth / carbon composite material is finally obtained by reduction reaction. In the composite material obtained by the method, metal bismuth particles are uniformly distributed in surfaces of carbon particles in nanometer size, and a phenomenon that a large amount of bismuth can be agglomerated by a traditional bismuth reduction method is prevented.

Description

technical field [0001] The invention discloses a nano-bismuth / carbon composite material and a preparation method thereof, belonging to the field of material preparation, and particularly designs a nano-bismuth / carbon composite material and its preparation. Background technique [0002] Alkaline water-based zinc-based batteries, such as zinc-manganese, zinc-nickel, and zinc-air batteries, are safer than lithium-ion batteries because they use non-flammable aqueous electrolytes. In recent years, recyclable secondary aqueous batteries, represented by zinc-nickel and zinc-air batteries, have attracted widespread attention. [0003] The negative electrode of aqueous zinc-based batteries often has a great influence on the capacity, working voltage, power efficiency, charge and discharge power, recyclability, and storage performance of the battery. People usually prepare zinc anodes into zinc powder, zinc particles, zinc balls, zinc flakes, zinc wires and other structures to increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/24B82Y30/00
CPCB82Y30/00H01M4/625H01M4/628H01M10/24Y02E60/10
Inventor 田忠良杨超辛鑫赵泽军杨凯赖延清李劼
Owner CENT SOUTH UNIV
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