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: 2015-04-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 membrane as a diaphragm. 2 Electrolytic cell and its application, by using a bipolar membrane to separate the cathode electrolysis chamber and the anode electrolysis chamber, the electrochemical reactions of the cathode and anode are carried out in alkaline and acidic environments respectively

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

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Embodiment 1

[0052] like figure 1 As shown, under room temperature conditions, a bipolar membrane is used to separate the electrolytic cell into a cathode chamber and an anode chamber, wherein 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 / liter, and the concentration of sulfuric acid is 0.5 mol / liter; lead sheet is used as cathode and platinum sheet is used as anode respectively, and the dimensions of lead sheet and platinum sheet are both: 1 cm (length) × 1 cm (width). Pass CO2 through the gas port to the anode electrolysis chamber for 30 minutes 2 Gas, control the flow rate of carbon dioxide gas to be 150 ml / min. Turn on the electrolysis power supply, and control the current density of the constant current electrolysis to 25A / m 2 、125A / m 2 、200A / m 2 、250A / m 2 , electrolyzed for 2 hours, carbon dioxide gets electrons on the cathode Pb...

Embodiment 2

[0057]At room temperature, a bipolar membrane is used to separate the electrolytic cell into a cathode chamber and an anode chamber, wherein the catholyte is a mixed solution containing 0.2 mol / L potassium bicarbonate and 0.5 mol / L potassium hydroxide, and potassium iodide in the anolyte The concentration of sulfuric acid is 1 mol / L, and the concentration of sulfuric acid is 0.5 mol / L; copper sheets are used as cathodes and platinum sheets are used as anodes respectively, and the dimensions of copper sheets and platinum sheets are both: 1 cm (length) × 1 cm (width ). Pass CO2 through the gas port to the anode electrolysis chamber for 30 minutes 2 Gas, control the flow rate of carbon dioxide gas to be 150 ml / min. Turn on the electrolysis power supply, and control the current density of constant current electrolysis to 25A / m 2 , electrolyzed for 1 hour, carbon dioxide gets electrons on the cathode Cu sheet to undergo an electrochemical reduction reaction, and iodide ions under...

Embodiment 3

[0061] At room temperature, a bipolar membrane is used to separate the electrolytic cell into a cathode chamber and an anode chamber, wherein the catholyte is a mixed solution containing 0.2 mol / L potassium bicarbonate and 0.5 mol / L potassium hydroxide, and potassium iodide in the anolyte The concentration of sulfuric acid is 2 mol / liter, and the concentration of sulfuric acid is 0.5 mol / liter; silver wire is used as cathode and platinum sheet is used as anode respectively, and the size of platinum sheet is 1 cm (length) × 1 cm (width). Pass CO2 through the gas port to the anode electrolysis chamber for 30 minutes 2 Gas, control the flow rate of carbon dioxide gas to be 150 ml / min. Turn on the electrolysis power supply, and control the current density of constant current electrolysis to 25A / m 2 , electrolyzed for 1 hour, carbon dioxide gets electrons on the cathode Ag electrode to undergo an electrochemical reduction reaction, and iodide ions undergo an oxidation reaction on ...

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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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Patent Type & Authority Patents(China)
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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