Electrochemical reduction CO2 electrolytic tank using bipolar membrane as diaphragm and application of electrochemical reduction CO2 electrolytic tank

A bipolar membrane and electrochemical technology, applied in the direction of diaphragm, electrolysis process, electrolysis components, etc., can solve the problems of high electrolysis voltage and large energy loss, and achieve the effect of reducing electrolysis voltage

Inactive Publication Date: 2013-02-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to overcome the problems of high electrolysis voltage and large energy loss in the technology of electrochemical reduction of carbon dioxide into small molecule fuels, and propose a method for electrochemical reduction of CO using a bipolar mem

Method used

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  • Electrochemical reduction CO2 electrolytic tank using bipolar membrane as diaphragm and application of electrochemical reduction CO2 electrolytic tank
  • Electrochemical reduction CO2 electrolytic tank using bipolar membrane as diaphragm and application of electrochemical reduction CO2 electrolytic tank
  • Electrochemical reduction CO2 electrolytic tank using bipolar membrane as diaphragm and application of electrochemical reduction CO2 electrolytic tank

Examples

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Example Embodiment

[0051] Example 1:

[0052] Such as figure 1 As shown, at room temperature, a bipolar membrane is used to separate the electrolytic cell into a cathode compartment and an anode compartment, where the catholyte is a mixed aqueous solution containing 0.2 mol / L potassium bicarbonate and 0.5 mol / L potassium hydroxide, and the anolyte The concentration of potassium iodide in the medium is 1 mol / L, and the concentration of sulfuric acid is 0.5 mol / L. Lead sheet is used as the cathode and platinum sheet is used as the anode. The size of the lead sheet and the platinum sheet are both: 1 cm (length) × 1 cm (width). Pass CO for 30 minutes to the anode electrolysis chamber through the air guide 2 Gas, control the flow rate of carbon dioxide gas to 150 ml / min. Switch on the electrolysis power supply and control the current density of constant current electrolysis to 25A / m 2 , 125A / m 2 , 200A / m 2 , 250A / m 2 After 2 hours of electrolysis, carbon dioxide gets electrons on the cathode Pb sheet t...

Example Embodiment

[0056] Example 2:

[0057] At room temperature, a bipolar membrane is used to separate the electrolytic cell into a cathode compartment and an anode compartment. The catholyte is a mixed solution containing 0.2 mol / L potassium bicarbonate and 0.5 mol / L potassium hydroxide. The anolyte contains potassium iodide. The concentration of sulphuric acid is 1 mol / L, and the concentration of sulfuric acid is 0.5 mol / L. The copper sheet is used as the cathode and the platinum sheet is used as the anode. The size of the copper sheet and the platinum sheet is 1 cm (length) × 1 cm (width ). Pass CO for 30 minutes to the anode electrolysis chamber through the air guide 2 Gas, control the flow rate of carbon dioxide gas to 150 ml / min. Switch on the electrolysis power supply and control the current density of constant current electrolysis to 25A / m 2 After 1 hour of electrolysis, carbon dioxide obtains electrons on the cathode Cu chip to undergo electrochemical reduction reaction, while iodide i...

Example Embodiment

[0060] Example 3:

[0061] At room temperature, a bipolar membrane is used to separate the electrolytic cell into a cathode compartment and an anode compartment. The catholyte is a mixed solution containing 0.2 mol / L potassium bicarbonate and 0.5 mol / L potassium hydroxide. The anolyte contains potassium iodide. The concentration of sulphuric acid is 2 mol / L, and the concentration of sulfuric acid is 0.5 mol / L. The silver wire is used as the cathode and the platinum sheet is used as the anode. The size of the platinum sheet is 1 cm (length) × 1 cm (width). Pass CO for 30 minutes to the anode electrolysis chamber through the air guide 2 Gas, control the flow rate of carbon dioxide gas to 150 ml / min. Switch on the electrolysis power supply and control the current density of constant current electrolysis to 25A / m 2 , After 1 hour of electrolysis, carbon dioxide obtains electrons on the cathode Ag electrode to undergo electrochemical reduction reaction, while iodide ions undergo oxida...

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Abstract

The invention relates to an electrochemical reduction CO2 electrolytic tank using a bipolar membrane as a diaphragm and an application of the electrochemical reduction CO2 electrolytic tank. The electrolytic tank comprises a cathode electrolysis compartment, cathode liquor, an anode electrolysis compartment, anolyte and the bipolar membrane for dividing the cathode electrolysis compartment and the anode electrolysis compartment. The electrode materials of the cathode electrolysis compartment include Pb (Plumbum), In (Indium) and Cu (Copper) etc, and the cathode liquor is an alkaline aqueous solution; and the electrode materials of the anode electrolysis compartment include Pt (Platioum) and Pd (Palladium) etc, and the anolyte is an acidic aqueous solution containing iodate. The hydroxy radicals in the cathode electrolysis compartment and the protons in the anodic electrolysis compartment are diffused to the bipolar membrane to generate water so as to form a voltage drop, so that the working voltage in the electrolytic tank is reduced. Compared with an anodic reaction that water and the electricity are oxidized to generate oxygen, the iodide ions are oxidized to generate an iodine elementary substance with low potential, small overpotential and quick dynamic process, so that the working voltage in the electrolytic tank is further reduced. CO2 is electrically reduced in a cathode compartment so as to generate small molecular fuels, such as formate, methanel, and methane; and the iodide ions are electrically oxidized to generate the elementary substance iodine in an anode compartment.

Description

technical field [0001] The invention belongs to the technical fields of energy storage, resource utilization of carbon dioxide and alternative energy, and specifically relates to an electrolytic cell with a bipolar membrane as a diaphragm and a method for electrochemically reducing CO 2 in the application. Background technique [0002] Carbon dioxide plays an important role in the Earth's carbon cycle. With the rapid development of science and technology, especially after the industrial revolution, human beings widely use fossil fuels and emit a large amount of carbon dioxide into the atmosphere, which destroys the earth's carbon cycle process, makes the content of carbon dioxide in the atmosphere continue to increase, and causes the "greenhouse effect". Lead to global warming and increased frequency of extreme weather. Therefore, more and more attention has been paid to effectively controlling the concentration of carbon dioxide in the atmosphere and protecting the living...

Claims

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Application Information

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IPC IPC(8): C25B13/02C25B13/08C25B3/04C25B3/25
Inventor 宋玉江李焕巧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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