Photoelectric synergistic carbon dioxide water co-electrolysis device based on paper-based electrode

Abstract

The device comprises an electrolytic tank and a positive electrode tank, a tank opening of the electrolytic tank faces upwards, an inlet pipe and a discharge pipe are arranged on the left side edge and the right side edge of the electrolytic tank correspondingly, a cathode piece is arranged in the electrolytic tank, and a first communicating tank is formed in the front end in the electrolytic tank; a communicating tank II is arranged on one side, close to the electrolytic tank, of the positive electrode tank, an exchange membrane is arranged between the communicating tank I and the communicating tank II, an exhaust pipe is arranged at the top of the positive electrode tank, a platinum metal electrode is arranged in the positive electrode tank, and a receiving end is arranged at the top of the platinum metal electrode; according to the invention, the electrolytic tank, the positive electrode tank, the solar power supply unit and the gas supply unit are matched, so that CO2 can be efficiently captured from low-concentration CO2 gas (such as air), and the captured CO2 is subjected to a co-electrolysis reaction by utilizing electrolyte to generate carbon monoxide and hydrogen by utilizing an electrochemical reaction of solar power supply, so that the synergistic interaction of CO2 emission reduction and recycling is realized.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide resource utilization technology, and in particular to a photoelectric co-electrolysis device for carbon dioxide and water based on paper-based electrodes. Background Technology

[0002] With the massive consumption of fossil fuels, the greenhouse effect and global warming caused by carbon dioxide (CO2) emissions are becoming increasingly serious. Controlling the concentration of CO2 in the atmosphere and converting it into useful resources has become an important research direction in the field of carbon recycling. Traditional CO2 capture methods mainly include chemical absorption and physical adsorption. For example, amine solution chemical absorption is often used for decarbonization of flue gas in coal-fired power plants, but its regeneration requires high-temperature heating, which consumes a lot of energy and the amine solution is corrosive, resulting in high long-term operating costs. In terms of physical adsorption, conventional porous materials such as zeolite and activated carbon have a certain adsorption capacity for CO2, but the adsorption capacity is limited under low concentration conditions (such as about 400 ppm in air), and some materials have poor stability when exposed to moisture, making them difficult to use in direct air capture (DAC) scenarios. On the other hand, CO2 conversion and utilization technologies include photocatalytic reduction and electrochemical reduction. Photocatalysis technology uses semiconductors to generate electron-hole pairs under light to reduce CO2 into fuels or chemical raw materials such as methanol, formic acid, and carbon monoxide. However, pure photocatalysis often has low conversion efficiency. Electrochemical CO2 reduction reaction (eCO2RR) can reduce CO2 to carbon-based products by passing an electric current through a metal electrode or catalyst, and the products are well controllable.

[0003] However, existing electrochemical reduction typically requires high-purity or high-concentration CO2 gas as a raw material, which limits the feasibility of directly capturing and converting CO2 from the air. In other words, electrochemical reduction often relies on pre-separation and concentration of CO2, which not only increases energy costs but also complicates the process.

[0004] To address this issue, a photoelectric co-electrolysis device based on paper-based electrodes for carbon dioxide and water is proposed to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a photoelectric co-electrolysis device for carbon dioxide and water based on paper-based electrodes. This invention, through the coordinated arrangement of an electrolytic cell, a positive electrode cell, a solar power supply unit, and a gas supply unit, can efficiently capture CO2 from low-concentration CO2 gas (such as air). The captured CO2 is then co-electrolyzed using an electrolyte via a solar-powered electrochemical reaction to generate carbon monoxide and hydrogen. The entire device design combines the advantages of highly selective CO2 adsorption, efficient photoelectrocatalytic conversion, and renewable energy utilization, achieving a synergistic effect of CO2 emission reduction and resource recovery. To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: According to one aspect of the present invention, a photoelectric synergistic carbon dioxide-water co-electrolysis device based on paper-based electrodes is provided, comprising an electrolysis reaction unit, a solar power supply unit, and a gas supply unit. The electrolysis reaction unit includes an electrolytic cell and a positive electrode cell. The electrolytic cell has its opening facing upwards and a sealing cover plate at its top. An electrolyte solution is provided inside the electrolytic cell. An inlet pipe and an outlet pipe are respectively provided on the left and right sides of the electrolytic cell, and the inlet pipe is connected to the gas supply unit for introducing ambient air or CO2-containing gas into the electrolytic cell. A cathode is provided inside the electrolytic cell. A connecting groove one is provided at the front end of the electrolytic cell. A connecting groove two is provided on the side of the positive electrode cell near the electrolytic cell, and the connecting groove one and the connecting groove two are connected by a flange. An exchange membrane is provided between the connecting groove one and the connecting groove two. An exhaust pipe is provided at the top of the positive electrode cell, and a platinum metal electrode is provided inside the positive electrode cell near the connecting groove two. A receiving end is provided at the top of the platinum metal electrode, and the receiving end extends upwards to the outside of the positive electrode cell.

[0006] Preferably, the cathode component includes two porous conductive metal plates symmetrically arranged in the electrolytic cell, and multiple connecting rods are evenly distributed at the upper end between the two porous conductive metal plates, with a paper-based electrode suspended on each connecting rod.

[0007] Preferably, the solar power supply unit includes a solar photovoltaic panel and a circuit control module connected thereto, wherein the solar photovoltaic panel is used to convert solar energy into electrical energy and supply it to the electrolysis reaction unit.

[0008] Preferably, the paper-based electrode is loaded with a metal-organic framework material through a nickel-carbon conductive adhesive layer, and the metal-organic framework material is NbOFFIVE-1-Ni type metal-organic framework (KAUST-7) powder.

[0009] Preferably, the nickel-carbon conductive adhesive layer has a nickel to carbon mass ratio of 6:4 to 8:2, a solid content of 60-70%, and a thickness of 50-200 μm, and is used to load metal-organic framework materials onto a paper substrate.

[0010] Preferably, the electrolytic cell is made of acrylic material, and the cathode is 110mm long, 70mm wide, and 42mm high. The paper-based electrode is 100mm long, suspended vertically in the electrolytic cell, and immersed in the electrolyte for 20mm. It achieves self-supply of electrolyte through the water absorption of the paper base, and the upper part is used for purging and adsorbing carbon dioxide.

[0011] Preferably, the electrolyte solution is an aqueous solution of sodium bicarbonate with a concentration of 0.1~1.0 mol / L.

[0012] Preferably, the cathode is a gas diffusion electrode, with one side of the cathode in contact with the electrolyte solution and the other side exposed to a CO2-containing gas environment; the paper-based electrode on the cathode has a porous structure to enhance CO2 propagation and adsorption.

[0013] Preferably, the water absorption rate of the paper-based electrode structure is ≥0.5 mL / (cm²·min).

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The photoelectric co-electrolysis device for carbon dioxide and water based on paper-based electrodes described in this invention, by setting up an electrolytic cell, a positive electrode cell, a solar power supply unit, and a gas supply unit in coordination, can efficiently capture CO2 from low-concentration CO2 gas (such as air), and use the solar-powered electrochemical reaction to co-electrolyze the captured CO2 in the electrolyte to generate carbon monoxide and hydrogen. The entire device design has the advantages of highly selective adsorption of CO2, efficient photoelectrocatalytic conversion, and renewable energy utilization, realizing the synergistic effect of CO2 emission reduction and resource utilization.

[0015] 2. The photoelectric co-electrolysis device for carbon dioxide and water based on paper-based electrodes of the present invention sets sodium bicarbonate (NaHCO3) solution as the electrolyte, with the sodium bicarbonate solution concentration preferably being 0.1 to 1.0 mol / L, preferably about 0.5 mol / L, thereby ensuring sufficient ionic conductivity while avoiding salting out or mass transfer limitations caused by excessively high concentrations. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is the present invention. Figure 1 Side view; Figure 3 This is a schematic diagram of the structure of the cathode component of the present invention; Figure 4 This is a schematic diagram of the overall process of the present invention; In the attached diagram, 1 is the electrolytic cell; 2 is the positive electrode cell; 3 is the sealing cover; 4 is the inlet pipe; 5 is the outlet pipe; 6 is the cathode component; 601 is the porous conductive metal plate; 602 is the connecting rod; 603 is the paper-based electrode; 7 is the first connecting tank; 8 is the second connecting tank; 9 is the exchange membrane; 10 is the exhaust pipe; 11 is the platinum metal electrode; 12 is the receiving end; and 13 is the solar photovoltaic panel. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the invention, and these aspects of the invention can be achieved even without these specific details.

[0018] Please see Figures 1 to 4 This invention provides a photoelectric synergistic carbon dioxide-water co-electrolysis device based on paper-based electrodes, the technical solution of which is as follows: The system includes an electrolysis reaction unit, a solar power supply unit, and a gas supply unit. The electrolysis reaction unit includes an electrolytic cell 1 and a positive electrode cell 2. The electrolytic cell 1 has its opening facing upwards and a sealing cover 3 on its top. The electrolytic cell 1 contains an electrolyte solution, which is an aqueous sodium bicarbonate solution with a concentration of 0.1~1.0 mol / L. The electrolytic cell 1 has an inlet pipe 4 and an outlet pipe 5 on its left and right sides, respectively. The inlet pipe 4 is connected to the gas supply unit to introduce ambient air or CO2-containing gas into the electrolytic cell 1. The electrolytic cell 1 has a cathode 6 inside. A connecting groove 7 is located at the front end of the electrolytic cell 1. A connecting groove 8 is located on the side of the positive electrode cell 2 near the electrolytic cell 1. The connecting grooves 7 and 8 are connected by a flange. An exchange membrane 9 is provided between the first channel 7 and the second connecting channel 8. An exhaust pipe 10 is provided at the top of the positive electrode channel 2, and a platinum metal electrode 11 is provided inside the positive electrode channel 2 near the second connecting channel. A receiving end 12 is provided at the top of the platinum metal electrode 11, extending upwards to the outside of the positive electrode channel 2. The anode uses a corrosion-resistant, insoluble anode material—a platinum electrode—to catalyze the oxidation reaction of water in the electrolyte to produce oxygen. The cathode component 6 includes two porous conductive metal plates 601 symmetrically arranged within the electrolytic cell 1, with multiple connecting rods 602 evenly distributed at the upper end between the two porous conductive metal plates 601. A paper-based electrode 603 is suspended on each connecting rod 602. The base of the paper-based electrode 603 is non-woven fabric, preferably polyester fiber (PET), with a basis weight of 80-120 g / m². g / m², thickness 0.5-1.2mm; the electrolytic cell 1 is made of acrylic material, and the cathode 6 is 110mm long, 70mm wide, and 42mm high. The paper-based electrode 603 is 100mm long, suspended vertically in the electrolytic cell 1, and immersed in the electrolyte for 20mm. It achieves self-supply of electrolyte through the water absorption of the paper base, and the upper part is used for purging and adsorbing carbon dioxide. A porous conductive metal plate with a length of 68mm and a width of 41mm is vertically embedded on each side of the electrolytic cell 1. The water absorption rate of the paper-based electrode 603 structure is ≥0.5 mL / (cm²·min).

[0019] The main body of the electrolytic cell 1 is an acrylic electrolytic cell 1, with porous conductive metal plates 601 inserted at both ends. Paper-based electrodes 603 are suspended between the metal plates by multiple rods. Metal-organic framework materials loaded on the paper substrate serve as cathodes, enabling the adsorption and co-electrolysis of carbon dioxide. Carbon dioxide is adsorbed onto the paper substrate through the porous metal plates by purging. A platinum metal electrode 11 is connected to one side of the electrolytic cell 1 to form a counter electrode chamber, and the anode and cathode are isolated by a proton exchange membrane 9. The entire device is powered by solar energy. During the electrochemical reaction, carbon monoxide and hydrogen are generated at the cathode, and oxygen is generated at the anode. In addition, the metal-organic framework materials loaded on the paper substrate can simultaneously undergo photocatalytic reactions. By combining electrolytic cell 1, positive electrode cell 2, solar power supply unit, and gas supply unit, CO2 can be efficiently captured from low-concentration CO2 gas (such as air). The captured CO2 is then co-electrolyzed with electrolyte using solar-powered electrochemical reactions to generate carbon monoxide and hydrogen. The entire device design combines the advantages of highly selective CO2 adsorption, efficient photoelectrocatalytic conversion, and renewable energy utilization, achieving synergistic effects of CO2 emission reduction and resource utilization.

[0020] The paper-based electrode 603 has a metal-organic framework material loaded onto it through a nickel-carbon conductive adhesive layer. The metal-organic framework material is NbOFFIVE-1-Ni type metal-organic framework (KAUST-7) powder. The adsorption capacity under conditions of 400ppm CO2 and 298K can reach about 1.3mmol / g. The nickel-carbon conductive adhesive layer has a nickel to carbon mass ratio of 6:4 to 8:2, a solid content of 60-70%, and a thickness of 50-200μm. It is used to load the metal-organic framework material onto the paper substrate. The nickel powder in the nickel powder layer has a particle size of 200-400 mesh and a loading amount of 2-5 mg / cm², which is uniformly loaded onto the surface of the conductive adhesive layer.

[0021] The electrolyte is a sodium bicarbonate (NaHCO3) solution. The concentration of the sodium bicarbonate solution is preferably 0.1 to 1.0 mol / L, more preferably about 0.5 mol / L, so as to ensure sufficient ionic conductivity while avoiding salting out or mass transfer limitation caused by excessively high concentration.

[0022] The solar power supply unit includes a solar photovoltaic panel 13 and a circuit control module connected thereto. The solar photovoltaic panel 13 is used to convert sunlight into electrical energy and supply it to the electrolysis reaction unit. The solar panel converts sunlight into direct current to provide the required electrical energy to the electrolysis reaction unit, thus eliminating dependence on high-energy-consuming and high-polluting energy sources.

[0023] The cathode 6 is a gas diffusion electrode, with one side of the cathode 6 in contact with the electrolyte solution and the other side exposed to a CO2-containing gas environment; the paper-based electrode 603 on the cathode 6 has a porous structure to enhance CO2 propagation and adsorption.

[0024] To stably control the electrochemical reaction conditions, a maximum power point tracking (MPPT) controller, a DC voltage regulator module, etc., can be used to adjust the photovoltaic output to a constant voltage and current to supply the electrodes. The design of the solar power supply unit enables the device to use clean and renewable energy to drive the CO2 conversion reaction when there is sunshine, without relying on grid power supply, thereby reducing carbon footprint and operating costs. To improve the capture rate of low-concentration CO2, this device can be equipped with a gas delivery device, such as a blower or micro fan on the cathode side to continuously blow ambient air over the paper-based electrode 603, thereby increasing the contact between CO2 and the adsorbent. In the electrolytic cell 1, a proton exchange membrane 9 is placed to divide the electrolytic cell 1 into two areas. The paper substrate is immersed in one half of the electrolytic cell 1, and the platinum electrode is placed in the other half of the electrolytic cell 1 and connected with the negative electrode wire of the solar panel. Then the cover plate is covered and sealed, leaving only one oxygen collection port.

[0025] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A photoelectric synergistic carbon dioxide-water co-electrolysis device based on paper-based electrodes, characterized in that, include: An electrolysis reaction unit, a solar power supply unit, and a gas supply unit are provided. The electrolysis reaction unit includes an electrolytic cell (1) and a positive electrode cell (2). The opening of the electrolytic cell (1) faces upward, and a sealing cover (3) is provided on the top of the electrolytic cell (1). An electrolyte solution is provided inside the electrolytic cell (1). An inlet pipe (4) and an outlet pipe (5) are respectively provided on the left and right sides of the electrolytic cell (1). The inlet pipe (4) is connected to the gas supply unit to introduce ambient air or CO2-containing gas into the electrolytic cell (1). A cathode element (6) is provided inside the electrolytic cell (1). 1) A connecting groove 1 (7) is provided at the inner front end. A connecting groove 2 (8) is provided on the side of the positive electrode groove (2) near the electrolytic cell (1). The connecting groove 1 (7) and the connecting groove 2 (8) are connected by a flange. An exchange membrane (9) is provided between the connecting groove 1 (7) and the connecting groove 2 (8). An exhaust pipe (10) is provided at the top of the positive electrode groove (2). A platinum metal electrode (11) is provided inside the positive electrode groove (2) near the connecting groove 2. A receiving end (12) is provided at the top of the platinum metal electrode (11). The receiving end (12) extends upward to the outside of the positive electrode groove (2).

2. The photoelectric synergistic carbon dioxide-water co-electrolysis device based on paper-based electrodes according to claim 1, characterized in that: The cathode component (6) includes two porous conductive metal plates (601) symmetrically arranged in the electrolytic cell (1), and multiple connecting rods (602) are evenly distributed at the upper end between the two porous conductive metal plates (601), and a paper-based electrode (603) is suspended on each connecting rod (602).

3. The photoelectric synergistic carbon dioxide-water co-electrolysis device based on paper-based electrodes according to claim 1, characterized in that: The solar power supply unit includes a solar photovoltaic panel (13) and a circuit control module connected thereto. The solar photovoltaic panel (13) is used to convert solar energy into electrical energy and supply it to the electrolysis reaction unit.

4. The photoelectric synergistic carbon dioxide-water co-electrolysis device based on paper-based electrodes according to claim 2, characterized in that: The paper-based electrode (603) has a metal-organic framework material loaded through a nickel-carbon conductive adhesive layer. The metal-organic framework material is NbOFFIVE-1-Ni type metal-organic framework (KAUST-7) powder.

5. The photoelectric synergistic carbon dioxide-water co-electrolysis device based on paper-based electrodes according to claim 4, characterized in that: The nickel-carbon conductive adhesive layer has a nickel to carbon mass ratio of 6:4 to 8:2, a solid content of 60-70%, and a thickness of 50-200μm, and is used to load metal-organic framework materials onto a paper substrate.

6. The photoelectric synergistic carbon dioxide water co-electrolysis device based on paper-based electrodes according to claim 2, characterized in that: The electrolytic cell (1) is made of acrylic material, and the cathode part (6) is 110mm long, 70mm wide and 42mm high. The paper-based electrode (603) is 100mm long, suspended vertically in the electrolytic cell (1), and immersed in the electrolyte for 20mm. It achieves self-supply of electrolyte through the water absorption of the paper base. The upper part is used for purging and adsorbing carbon dioxide.

7. The photoelectric synergistic carbon dioxide water co-electrolysis device based on paper-based electrodes according to claim 1, characterized in that: The electrolyte solution is an aqueous solution of sodium bicarbonate with a concentration of 0.1~1.0 mol / L.

8. The photoelectric synergistic carbon dioxide water co-electrolysis device based on paper-based electrodes according to claim 6, characterized in that: The cathode (6) is a gas diffusion electrode, and one side of the cathode (6) is in contact with the electrolyte solution, while the other side is exposed to a CO2-containing gas environment; the paper-based electrode (603) on the cathode (6) has a porous structure to enhance CO2 propagation and adsorption.

9. The photoelectric synergistic carbon dioxide-water co-electrolysis device based on paper-based electrodes according to claim 2, characterized in that: The paper-based electrode (603) structure has a water absorption rate ≥ 0.5 mL / (cm²·min).

Images