An Efficient Coupling Method of Anodic Oxidation to Produce Hypochlorite and Cathodic Reduction of Carbon Dioxide

A technology of carbon dioxide and hypochlorite, which is applied in the field of catalysis, can solve the problems of catalyst deactivation, and achieve the effect of less metal loading, no danger, and easy synthesis conditions

Active Publication Date: 2021-01-19
HUAZHONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, chloride ions are easy to form complexes with the metals in the catalyst to deactivate the catalyst.

Method used

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  • An Efficient Coupling Method of Anodic Oxidation to Produce Hypochlorite and Cathodic Reduction of Carbon Dioxide
  • An Efficient Coupling Method of Anodic Oxidation to Produce Hypochlorite and Cathodic Reduction of Carbon Dioxide
  • An Efficient Coupling Method of Anodic Oxidation to Produce Hypochlorite and Cathodic Reduction of Carbon Dioxide

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Experimental program
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Effect test

Embodiment 1

[0039] Preparation of monoatomic iron-supported nitrogen-doped carbon materials:

[0040] Dissolve 0.5g of zinc nitrate hexahydrate in 10mL of methanol to obtain liquid A, and dissolve 0.55g of dimethylimidazole in 10mL of methanol to obtain liquid B. Add liquid A to liquid B, ultrasonicate, and react at 30°C for 10 hours. The solid product after the reaction was collected by centrifugation, washed three times with DMF and methanol respectively, and the washed solid product was collected by centrifugation, and dried in a vacuum oven at 80°C to obtain ZIF-8; take 0.1g of the above ZIF-8 powder and add 10ml 0.01 % iron acetylacetonate in tetrahydrofuran solution, sonicate for 1h to make it fully and evenly mixed; vacuum for 1h to obtain a solid powder; calcinate the above powder at 950°C for 2h in an Ar atmosphere, and after naturally cooling to room temperature, collect the reaction product to obtain Nitrogen-doped carbon supported on monoatomic iron. Tested by IPC-OES, the ir...

Embodiment 2

[0050] Construction of the electrolysis system:

[0051] Weigh 10 mg of monoatomic iron-supported nitrogen-doped carbon as a precursor, ultrasonically disperse it into a mixture of 1 mL of Nafion (2 wt%) and isopropanol, and then add 150 μL of monoatomic iron-supported nitrogen-doped carbon suspension to 1cm on the surface 2 The surface of the glassy carbon electrode was dried under an infrared lamp to prepare a nitrogen-doped carbon / glassy carbon electrode supported by single-atom iron. The catalyst loading in the electrode was 1.5mg / cm 2 .

[0052] In an electrolytic cell separated by a proton exchange membrane into an anode tank and a cathode tank, the nitrogen-doped carbon catalyst electrode supported by monoatomic iron is used as the working electrode (cathode), the ruthenium titanium is the auxiliary electrode (anode), and the anode and catholyte solutions are 0.1M sodium chloride solution, carbon dioxide is passed into the cathode tank to saturation, and then electric...

Embodiment 3

[0058] Realization of electrocatalytic cathode reduction of CO2 and anode production of hypochlorite:

[0059] When carbon dioxide is reduced at a cell pressure of 1.0V, the current efficiency of carbon monoxide is 33.99%, and the current efficiency of hypochlorite produced by the anode is 23.75%. The current efficiency of chlorate is 51.47%; the current efficiency of reducing carbon dioxide and carbon monoxide is 81.22% under the cell pressure of 2.0V, and the current efficiency of hypochlorite produced by the anode is 78.195%; reducing carbon dioxide and carbon monoxide under the cell pressure of 2.5V The current efficiency is 99.63%, the current efficiency of hypochlorite produced by the anode is 99.47%, the carbon monoxide is reduced at a cell voltage of 3.0V, the current efficiency of carbon monoxide is 99.21%, and the current efficiency of hypochlorite produced by the anode is 99.08%. Experimental results such as Figure 8 Shown: When the tank voltage is 2.5V, its Farad...

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Abstract

The invention provides a coupling method of anode oxidization hypochlorite production and cathode carbon dioxide reduction. A single-atom iron loaded nitrogen doping carbon material is used as a catalyst to perform electrocatalytic reduction on CO2; meanwhile, the anode oxidization can produce hypochlorite, so that the goal of efficiently producing hypochlorite and reducing carbon dioxide into carbon monoxide at the same time can be achieved; the single-atom iron loaded nitrogen doping carbon material has a polyhedron microstructure with the length and width in the nanometer scale dimensions;the loaded metal in the single-atom iron loaded nitrogen doping carbon material is dispersed in a single atom form. The material is used for electrochemical reduction of carbon dioxide; the current efficiency for selectively reducing the carbon dioxide into the carbon monoxide is as high as 99.63 percent or higher; the stability is high; meanwhile, the current efficiency for producing the hypochlorite by the anode is as high as 99.47 percent; high faradic efficiency can be maintained for a long time.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to a method for coupling production of hypochlorite by anodic oxidation and reduction of carbon dioxide by a cathode. Background technique [0002] In recent decades, the rapid economic development has brought us a lot of convenience, but it has also created a series of environmental problems. While using fossil fuels, a large amount of carbon dioxide gas has been emitted, which has increasingly aggravated the negative effects of the greenhouse effect on the living environment of the earth. influences. How to recover and utilize carbon dioxide has become an important research topic at present. [0003] Electrocatalytic reduction of CO 2 Using renewable energy to generate electricity, converting energy into compounds with high energy state density such as CO, formic acid, alcohols, and hydrocarbons, and storing them so that the energy can be reused is of great significance for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/26B01J27/24
Inventor 张礼知全凤娇贾法龙
Owner HUAZHONG NORMAL UNIV
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