Method for electrolyzing aluminum at low temperature in deep eutectic solvent

A deep eutectic solvent and electrolytic metal technology, applied in the field of materials, can solve the problems of high price, secondary pollution, high viscosity, etc., and achieve the effects of low preparation cost, avoiding the generation of dendritic aluminum, and simple operation

Active Publication Date: 2018-06-15
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, organic solvents are easily volatile during use as electrolytes, causing secondary pollution; and the existing ionic liquids also limit the industrialization of this electrolyte in electrolytic aluminum because of its high viscosity, high price, and the formation of unknown products. application

Method used

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  • Method for electrolyzing aluminum at low temperature in deep eutectic solvent
  • Method for electrolyzing aluminum at low temperature in deep eutectic solvent
  • Method for electrolyzing aluminum at low temperature in deep eutectic solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of oxalic acid-polyethylene glycol deep eutectic solvent, the mol ratio of oxalic acid and polyethylene glycol with a number average molecular weight of 200 is 1:2, 1:4, 1:6, 1:8, wherein the amount of fixed oxalic acid is 0.1mol. , heated and stirred at 40°C for 10 min to form an oxalic acid-polyethylene glycol deep eutectic solvent. Weigh 0.1g of alumina and dissolve in oxalic acid-polyethylene glycol deep eutectic solvent, heat and stir, use this system as electrolyte, use soluble aluminum matrix composite material as anode, stainless steel sheet as cathode, and fix the distance between electrodes at 1.5cm , for electrolysis. During the electrolysis process, the temperature is 25°C and the current density is 60-100mA·cm -2 And the working voltage is 1.8-2V. After electrolysis for 0.5h, the copper sheet was soaked in absolute ethanol, and after drying, the aluminum layer was peeled off, weighed, and the efficiency was calculated.

[0040] The results o...

Embodiment 2

[0044] Prepare a choline chloride-polyethylene glycol deep eutectic solvent, the molar ratio of oxalic acid to polyethylene glycol with a number average molecular weight of 200 is 1:2, 1:4 and 1:6, heat and stir at 30°C for 10 minutes to form Choline chloride-polyethylene glycol deep eutectic solvent, in which the amount of choline chloride fixed is 0.1mol. Weigh 0.1g of alumina and dissolve it in the choline chloride-polyethylene glycol deep eutectic solvent, heat and stir, use this system as the electrolyte, use the soluble aluminum matrix composite material as the anode, and the stainless steel sheet as the cathode, and fix the distance between the electrodes 1.5cm, electrolysis. During the electrolysis process, the temperature is 25°C and the current density is 160-200mA·cm -2 And the working voltage is 1.8-2V. After 4 hours of electrolysis, the copper sheet was soaked in absolute ethanol, and after drying, the aluminum layer was peeled off, weighed, and the efficiency w...

Embodiment 3

[0049] Prepare urea-polyethylene glycol deep eutectic solvent, the molar ratio of oxalic acid to polyethylene glycol is 1:2, 1:4 and 1:6, heat and stir at 35°C for 10min to form urea-polyethylene glycol deep eutectic Solvent, wherein the amount of fixed urea is 0.1mol. Weigh 0.1g of alumina and dissolve it in urea-polyethylene glycol deep eutectic solvent, heat and stir, use this system as electrolyte, use soluble aluminum matrix composite material as anode, stainless steel sheet as cathode, and fix the distance between electrodes at 1.5cm , for electrolysis. During the electrolysis process, the temperature is 25°C and the current density is 80-100mA·cm -2 And the working voltage is 1.8-2V. After 8 hours of electrolysis, the copper sheet was soaked in absolute ethanol, and after drying, the aluminum layer was peeled off, weighed, and the efficiency was calculated.

[0050] The results obtained are: the molar ratios of the prepared urea-polyethylene glycol deep eutectic solv...

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Abstract

The invention discloses a method for electrolyzing aluminum at the low temperature in a deep eutectic solvent. The method comprises the following steps that a hydrogen bond donor and a hydrogen bond receptor are mixed according to proportioning, the deep eutectic solvent is obtained, then metal oxide is dissolved in the deep eutectic solvent, and a system serves as an electrolyte solution for electrolyzing. The method has the advantages that the deep eutectic solvent serves as the electrolyte, the deep eutectic solvent has common characteristics of ion liquid and further has the advantages ofbeing simple in synthesizing, low in price, high in purity and the like, and the deep eutectic solvent is the ideal solvent for electrochemical deposition of the aluminum; aluminum electrolyzing at the room temperature is realized, a bright, homogeneous and dense aluminum deposition layer is obtained, the adhesion ability of the aluminum deposition layer is improved, formation of dendrite aluminumis avoided, and the problem that a current deposition layer is prone to falling is solved; and gas generation and environmental pollution in the electrolyzing process are avoided.

Description

technical field [0001] The invention belongs to the field of materials and relates to a method for electrolyzing aluminum at a low temperature in a deep eutectic solvent. Background technique [0002] The electrolytic aluminum industry is the largest electrochemical industry in the world. Driven by the sustainable development of my country's economy, the domestic production of alumina and electrolytic aluminum has developed rapidly, and the production capacity and actual output have also continued to grow. The modern aluminum industry mainly uses the Hall-Héroult method to produce aluminum, that is, the cryolite-alumina electrolysis method. After more than 100 years of development, this method has become increasingly mature, but there are still problems such as high electrolysis temperature, high energy consumption, and serious pollution. , and the aluminum deposition layer obtained by the current process is thin, and it is easy to form dendrites and powdery particles during...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/18C25C3/02C25B1/00
CPCC25C3/02C25C3/18C25B1/33
Inventor 牟天成蒋静云赵新辉陈文君王晋芳
Owner RENMIN UNIVERSITY OF CHINA
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