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Molten salt electrochemical method for coproducing metal/carbon composite material and hydrogen

A carbon composite material, electrochemical technology, applied in electrodes, electrolysis components, electrolysis process and other directions, can solve the problems of incomplete reaction, high reaction temperature, difficult to control, etc., to achieve increased added value, mild reaction conditions and simple steps. Effect

Active Publication Date: 2021-12-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, a large amount of deposited solid by-product carbon can easily lead to catalyst deactivation during the catalytic reaction process, incomplete reaction and CO 2 Emissions and other issues, and the difficulty of reusing carbon products is also a waste of resources
[0005] Judging from the currently published materials, the existing methane hydrogen production processes are all facing the huge challenge of high hydrogen purification and increasing the added value of carbon products, and some reaction processes have high reaction temperatures and are difficult to control

Method used

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  • Molten salt electrochemical method for coproducing metal/carbon composite material and hydrogen
  • Molten salt electrochemical method for coproducing metal/carbon composite material and hydrogen
  • Molten salt electrochemical method for coproducing metal/carbon composite material and hydrogen

Examples

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Effect test

Embodiment 1

[0029] with CaCl 2 , NaCl, (molar ratio is 52:48) 500g molten salt as electrolyte, add 20g CaO, mix well and pour into crucible. First raise the temperature at 5°C / min to 250°C and keep it warm for 24 hours to completely evaporate the water in the molten salt. Then the temperature was raised to 850°C at 5°C / min, and at the same time, argon gas was introduced as a protective atmosphere, and the temperature was kept for 3 hours, and the temperature was lowered and kept at 700°C. Use the metal Au sheet as the anode, pass 3vol% methane on the surface of the metal Au sheet, use the liquid Zn as the cathode, and electrolyze with the potential of 0.8V vs. Ag / AgCl for 5 hours. (see attached image 3 ), and no other gas was detected except methane and argon, that is, methane was decomposed into hydrogen at the anode. After the electrolysis, the liquid Zn electrode was taken out and washed three times with deionized water and absolute ethanol respectively to obtain the metal Zn / carbo...

Embodiment 2

[0031] with CaCl 2 , NaCl (molar ratio is 52:48) 500g molten salt is used as the electrolyte, mix well and pour into the crucible. First raise the temperature at 5°C / min to 300°C and keep it warm for 24 hours to completely evaporate the water in the molten salt. Then the temperature was raised to 850°C at 5°C / min, and at the same time, argon gas was introduced as a protective atmosphere, and the temperature was kept for 3 hours, and then the temperature was lowered to 850°C and kept at 850°C. will CO 2 As an added oxide, it is passed into the molten salt medium at a speed of 100mL / min. The metal Ru-GDC sheet is used as the anode, and 10vol% methane is passed on the surface of the metal Ru-GDC sheet, and the liquid SnBi alloy is used as the cathode. Potential electrolysis of vs.Ag / AgCl for 1 hour, and at the same time using online gas chromatography to simultaneously monitor the synchronous precipitation of hydrogen in the anode area, removing methane and CO 2 No other gases...

Embodiment 3

[0035] With LiCl, NaCl (1:1 molar ratio) 500g molten salt as electrolyte, add 20g Na 2 O, mixed well and poured into the crucible. First raise the temperature at 5°C / min to 300°C and keep it warm for 24 hours to completely evaporate the water in the molten salt. Then the temperature was raised to 850°C at 5°C / min, and at the same time, argon gas was introduced as a protective atmosphere, and the temperature was kept for 3 hours, and then the temperature was lowered to 650°C and kept at 650°C. The metal Cu mesh is used as the anode, methane is passed on the surface of the metal Cu mesh, and the liquid Ga is used as the cathode, at 40mA / cm 2 The electric current was electrolyzed for 12 hours, and the anode potential was monitored to be 0.81vs.Ag / AgCl during the electrolysis process. Simultaneously, the anode was monitored by online gas chromatography to produce hydrogen gas synchronously, and no other gases were detected except methane. After the electrolysis, the liquid Ga e...

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Abstract

The invention relates to a molten salt electrochemical method for coproducing a metal / carbon composite material and hydrogen. In chloride molten salt electrolyte containing oxygen ions, low-melting-point metal serves as a cathode, methane is introduced into the surface of the anode, direct current is introduced between the cathode and the anode, the potential of the anode is controlled between a methane partial oxidation hydrogen evolution potential and an oxygen ion oxidation oxygen evolution potential during electrolysis, the anode is subjected to a methane oxidation reaction, and hydrogen is generated; and meanwhile, carbon in the methane is combined with the liquid metal at the cathode to generate the metal / carbon composite material. The method is simple in steps, the greenhouse gas methane can serve as a hydrogen source and a carbon source at the same time, high-purity hydrogen is obtained at the anode, meanwhile, carbon atoms of the methane are fixed to the low-melting-point metal cathode in a solid form, the metal / carbon composite material is obtained, and effective separation of products hydrogen and carbon is achieved. Methane is converted into hydrogen and high-value-added carbon, and value-added utilization of low-melting-point metal is achieved.

Description

technical field [0001] The invention belongs to the field of material metallurgy and also belongs to the field of high-efficiency energy conversion, and specifically relates to a molten salt electrochemical method for co-producing metal / carbon composite materials and hydrogen. Background technique [0002] The rapid economic development is accompanied by the increasing consumption of fossil energy, which leads to various energy crises and environmental pollution. Therefore, the research on green energy and energy storage technology has received extensive attention. [0003] In terms of energy storage, carbon nanomaterials are used in the field of electrochemical energy storage due to their stable chemical properties, diverse morphology structures, and good electrical conductivity. However, traditional carbon material anodes have low theoretical capacity. Combining carbon materials and metals to obtain metal / carbon materials, on the one hand, has a higher theoretical capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/02C25B1/135C25B1/50C25B11/033C25C3/34C25C3/36C25C3/04C25C3/08C25C3/18
CPCC25B1/02C25B1/135C25B1/50C25B11/033C25C3/34C25C3/36C25C3/04C25C3/08C25C3/18Y02E60/36
Inventor 肖巍吕腾吴田周静王景
Owner WUHAN UNIV
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