CN-122013210-A - Membrane-free electrolytic tank and method for electrolyzing water by using same

Abstract

The invention provides a membraneless electrolytic tank and a method for electrolyzing water by adopting the membraneless electrolytic tank, the membraneless electrolytic tank comprises a tank body, a driving belt-shaped electrode is arranged in the tank body, and a scraping plate with one end facing the surface of the transmissible strip electrode, which is used for synchronously removing bubbles attached to the surface in the transmission process of the transmissible strip electrode. The invention reduces the dependence of the membraneless electrolytic cell on the flowing form of electrolyte, enhances the adaptability to complex fluid conditions and obviously reduces the requirement on high current density through the cooperative action of the mechanical transmission of the transmissible strip electrode and the scraping plate.

Inventors

• YANG NING
• XU FAN
• BAI JINHAO
• GUAN XIAOPING

Assignees

• 中国科学院过程工程研究所

Dates

Publication Date

20260512

Application Date

20251125

Claims (10)

1. 1. The membraneless electrolytic cell is characterized by comprising a cell body, wherein a transmissible strip electrode and a scraping plate with one end facing the surface of the transmissible strip electrode are arranged in the cell body, and the scraping plate is used for synchronously removing bubbles attached to the surface of the transmissible strip electrode in the transmission process.
2. 2. The membraneless electrolytic cell of claim 1, wherein a cathode drivable band electrode and a cathode scraper are disposed within the cell body, further comprising an anode drivable band electrode and an anode scraper; One end of the cathode scraping plate faces to the surface of the cathode transmissible strip electrode, and one end of the anode scraping plate faces to the surface of the anode transmissible strip electrode; preferably, the cathode and anode transmissible band electrodes are made of nickel respectively and independently.
3. 3. A membraneless electrolytic cell according to claim 2, characterized in that one end of the cathode and anode scrapers is fixed to the bottom of the cell body, respectively, and the other end faces the surfaces of the cathode and anode drivable band electrodes, respectively.
4. 4. A membraneless electrolytic cell according to claim 2 or 3, characterized in that the distance between the cathode scraper and the cathode transmissible strip electrode, which is directed towards one end of the cathode transmissible strip electrode, is 0.1 mm-1 mm; preferably, the distance between one end of the anode scraping plate, which faces to the anode transmissible belt-shaped electrode, and the anode transmissible belt-shaped electrode is 0.1 mm-1 mm.
5. 5. A membraneless electrolytic cell according to claim 2 or 3, characterized in that a transmission assembly driving the transmissible belt-like electrode transmission is also provided in the membraneless electrolytic cell.
6. 6. The membrane-free electrolytic cell of claim 5 wherein the drive assembly comprises four drive rollers, two of the drive rollers matching the cathode drivable belt electrode and two of the drive rollers matching the anode drivable belt electrode.
7. 7. The membraneless electrolytic cell of claim 1, further comprising a gas collection device disposed at a top of the cell body for separating and collecting hydrogen and oxygen generated within the cell body.
8. 8. The membraneless electrolytic cell of claim 1, wherein the cell body comprises two single cells arranged side by side, the lower portions of adjacent side walls of the two single cells are communicated, and the upper portions are isolated from each other.
9. 9. A method of electrolyzing water using the membraneless electrolytic cell of any one of claims 1 to 8, comprising: The electrified transmissible strip electrode continuously drives, and the surface of the transmissible strip electrode is subjected to water decomposition reaction under the action of an electric field to generate hydrogen and oxygen; In the continuous transmission process of the belt-shaped electrode, the scraping plates synchronously remove bubbles attached to the surface of the belt-shaped electrode.
10. 10. The method according to claim 9, characterized in that the method comprises: The two driving rollers matched with the cathode driving belt-shaped electrode drive the cathode driving belt-shaped electrode to drive the anode driving belt-shaped electrode to drive the cathode driving belt-shaped electrode, the cathode driving belt-shaped electrode and the anode driving belt-shaped electrode are electrified, the surfaces of the cathode driving belt-shaped electrode and the anode driving belt-shaped electrode are subjected to water decomposition reaction under the action of an electric field to generate hydrogen and oxygen, and the generated hydrogen and oxygen are separated and collected by a gas collecting device arranged at the top of the tank body; in the transmission process of the cathode transmissible strip electrode and the anode transmissible strip electrode, the cathode scraping plate synchronously removes bubbles attached to the surface of the cathode transmissible strip electrode, and the anode scraping plate synchronously removes bubbles attached to the surface of the anode transmissible strip electrode.

Description

Membrane-free electrolytic tank and method for electrolyzing water by using same Technical Field The invention belongs to the technical field of electrolyzed water, relates to a membraneless electrolytic tank, and particularly relates to a membraneless electrolytic tank and a method for electrolyzing water by adopting the membraneless electrolytic tank. Background The hydrogen production by water electrolysis not only can realize clean energy conversion, but also is an important way for obtaining green hydrogen. However, the production cost of "green hydrogen" is still higher than that of "blue hydrogen" and "gray hydrogen" which are fossil fuels, and the total global hydrogen production is less than 4%. In recent years, with the gradual decrease of wind energy and solar energy power generation costs, the manufacturing cost of the water electrolysis device becomes a major obstacle in the large-scale popularization of green hydrogen. Existing proton exchange membrane electrolyzers (PEM), alkaline electrolyzers (ALK) and anion exchange membrane electrolyzers (AEM) all employ a basic cathode chamber/membrane/anode structure. The existence of the diaphragm not only increases the manufacturing cost and energy consumption of the equipment, but also brings high maintenance cost and potential safety hazard due to the problems of aging, blockage and the like. In recent years, the technology of membrane-free electrolyzed water has emerged as an innovative solution that has great potential in reducing the cost of green hydrogen production. However, the membraneless electrolytic cell in the prior art generally depends on the flowing form of alkali liquor to realize gas-liquid separation, and the operation control is complex. For example, a flow type membraneless electrolyzer is required to strictly maintain a laminar flow state and has higher requirements on current density, otherwise, gas cross permeation and incomplete separation are easily caused, and the hydrogen production efficiency and purity are affected. These limitations have limited the popularization and application of membraneless electrolysis technologies to a great extent. CN118792670a discloses a membraneless electrolytic device and membraneless electrolytic method, the membraneless electrolytic device comprises membraneless electrolytic cell, flow component and power supply component. The membraneless water electrolysis cell comprises a cathode electrode and an anode electrode, wherein a micro-nano scale interval is arranged between the cathode electrode and the anode electrode, the anode electrode is used for generating oxygen through electrification, and the cathode electrode is used for generating hydrogen through electrification. A flow assembly is used to provide electrolyte to the membraneless water electrolysis cell, and the flow assembly is also used to cause the electrolyte to flow between the anode and cathode electrodes of the membraneless water electrolysis cell so that the electrolyzed oxygen and hydrogen can be discharged. The power supply assembly is used for providing adjustable electric energy for the cathode electrode and the anode electrode of the membraneless water electrolysis cell. CN104628092a discloses a new method for controlling acid-base nature of electrolyzed water without membrane, which is characterized by comprising a container, an electrode assembly without membrane arranged in the container, a controllable electrolysis power supply, wherein raw water is filled into the container, the controllable electrolysis power supply supplies power to the electrode assembly without membrane, water is electrolyzed in a positive-negative electrode gap of the electrode assembly, the controllable electrolysis power supply controls the acid-base nature of the electrolyzed water by alternately providing two electrolysis voltages with opposite polarities for the electrode assembly without membrane or controls other electrolyzed water indexes, when the power supply supplies voltage with opposite polarities, the pH value of the electrolyzed water produced by the electrode assembly without membrane has different tendencies of changing in trend of acid or alkali, the container can be provided with a water inlet and a water outlet, and raw water flows out of the water outlet after entering the container through the electrode assembly without membrane for electrolysis. CN117779068a discloses an electrolytic water device and method for membrane-free oxyhydrogen separation, the electrolytic water device comprises an electrolytic water element, the electrolytic water element comprises a hydrogen generating chamber, an oxygen generating chamber, a buffer chamber, a power supply and a flow channel, the hydrogen generating chamber comprises a hydrogen evolution catalytic electrode and a hydrogen outlet, the oxygen generating chamber comprises an oxygen evolution catalytic electrode and an oxygen outlet, the buffer chamber comprises a medium electrode