CN223879854U - An ion-free membrane stack structure for the electrochemical synthesis of hydrogen peroxide - Google Patents
An ion-free membrane stack structure for the electrochemical synthesis of hydrogen peroxideInfo
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- CN223879854U CN223879854U CN202423163859.2U CN202423163859U CN223879854U CN 223879854 U CN223879854 U CN 223879854U CN 202423163859 U CN202423163859 U CN 202423163859U CN 223879854 U CN223879854 U CN 223879854U
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- hydrogen peroxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
本实用新型涉及电催化电极材料及设备领域，特别涉及一种用于双氧水电化学合成的无离子膜电堆结构，包括：用于支撑电堆内部结构的阳极端板和阴极端板，阳极端板和阴极端板分别连接阳极电极和阴极电极，阳极电极上嵌合有用于电解液流通和反应的流场板，阴极电极上设置有用于给阴极电极提供电流的阴极集流板，阴极端板和阴极集流板之间放置有用于控制阴极气体流通的气体板，通过这种独特的堆叠方式，本实用新型的电堆利用各部件之间的协同作用，在无需离子膜的情况下，通过巧妙的设计，让阴阳两极的反应同在一个反应腔体中，却能够高效的生产过氧化氢，同时保证了反应气体、电解液在电极表面的合理分布，从而实现电堆的稳定高效运行。
This utility model relates to the field of electrocatalytic electrode materials and equipment, and particularly to an ion-free membrane stack structure for the electrochemical synthesis of hydrogen peroxide. The structure includes: an anode end plate and a cathode end plate for supporting the internal structure of the stack; the anode end plate and cathode end plate are respectively connected to the anode electrode and the cathode electrode; a flow field plate for electrolyte flow and reaction is embedded on the anode electrode; a cathode current collector is provided on the cathode electrode for supplying current to the cathode electrode; and a gas plate for controlling the flow of cathode gas is placed between the cathode end plate and the cathode current collector. Through this unique stacking method, the stack of this utility model utilizes the synergistic effect between its components to efficiently produce hydrogen peroxide in the same reaction chamber without the need for an ion-exchange membrane, while ensuring a reasonable distribution of reaction gas and electrolyte on the electrode surface, thereby achieving stable and efficient operation of the stack.
Description
Technical Field
The utility model relates to the field of electrocatalytic electrode materials and equipment, in particular to an ion-free membrane galvanic pile structure for electrochemical synthesis of hydrogen peroxide.
Background
Hydrogen peroxide (H2O 2), also known as hydrogen peroxide, is a clean and pollution-free efficient oxidant with wide application, and byproducts are water and oxygen, so that the hydrogen peroxide is often used in the fields of water body treatment, food processing, chemical synthesis, integrated circuits and the like. Along with the increasing attention of society and people to pollution and sanitation problems, the demand of hydrogen peroxide in each industry is gradually increased, and the market share of hydrogen peroxide is increased year by year. At present, most hydrogen peroxide industrial products are mainly prepared by an anthraquinone method, and the method needs relatively complete industrial infrastructure, relatively high energy consumption and expensive noble metal catalysts, so that the cost of the hydrogen peroxide industrial products can be reduced only by transporting the hydrogen peroxide finished products with relatively high concentration. However, concentrated hydrogen peroxide belongs to dangerous chemicals, and not only generates risks of transportation and storage, but also brings about corresponding cost. In order to reduce the risk and cost of its use, as well as to reduce the carbon footprint during its production, many researchers and engineers have recently begun to pay great attention to the production of hydrogen peroxide by electrochemical catalytic reduction of oxygen. The method is a green, environment-friendly, efficient and energy-saving preparation method, which reduces oxygen into hydrogen peroxide by electrochemical reaction, and avoids the complex flow and environmental pollution of the traditional anthraquinone method. The technology can realize the in-situ preparation of the hydrogen peroxide at the demand end, so that the steps of separation, purification, transportation and the like are omitted, the cost is reduced, the application range is enlarged, and the technology is considered as the future development direction of hydrogen peroxide production. However, the hydrogen peroxide electrosynthesis technique requires a suitable galvanic pile to achieve its efficient and stable production. Typically, such stacks are constructed from an anode chamber, a cathode chamber, and a gas chamber. The anode chamber is used for anode reaction (generally electrolysis oxygen generation reaction) so as to generate electrons and protons, the electrons are transferred to the cathode through the external path, the cathode obtains electrons in the cathode chamber and reduces oxygen to become peroxy hydrogen ions (HO 2-), and the peroxy hydrogen ions are converted into hydrogen peroxide after obtaining the protons transferred by the anode. The gas chamber provides sufficient reactant gas-oxygen or air-to the cathode. It follows that in order to prevent oxidation of hydrogen peroxide at the anode, the cathode and anode chambers are typically separated by a proton exchange membrane. However, the proton exchange membrane has high cost and is easily corroded by peroxide, so that the existing galvanic pile device needs to be redesigned to avoid the use of the proton membrane, and meanwhile, the production of hydrogen peroxide is not restricted. Therefore, the design and the construction of the membraneless galvanic pile have important significance and practical prospect for the development and commercialization of hydrogen peroxide electrosynthesis.
Disclosure of utility model
To solve the technical problems.
The application provides an ion-free membrane pile structure for electrochemical synthesis of hydrogen peroxide, which comprises an anode end plate and a cathode end plate for supporting the internal structure of the pile, wherein the anode end plate and the cathode end plate are respectively connected with an anode electrode and a cathode electrode, a flow field plate for electrolyte circulation and reaction is embedded on the anode electrode, a cathode current collecting plate for providing current for the cathode electrode is arranged on the cathode electrode, and a gas plate for controlling cathode gas circulation is arranged between the cathode end plate and the cathode current collecting plate.
Further, the anode end plate is tightly attached to the anode electrode through an anode silica gel pad, and the flow field plate is tightly attached to the cathode electrode and the cathode current collecting plate is tightly attached to the gas plate through a cathode silica gel pad.
Further, the anode electrode and the cathode current collecting plate are respectively provided with an anode tab and a cathode tab which are connected with a cathode and an anode of a power supply.
Further, the flow field plate is provided with a liquid inlet and a liquid outlet for electrolyte to enter and exit.
Further, the gas plate is provided with a gas inlet and a gas outlet for gas to enter and exit.
Further, the anode silica gel pad, the anode electrode, the flow field plate, the cathode silica gel pad, the cathode electrode, the cathode current collecting plate and the gas plate are sequentially and repeatedly stacked to form a galvanic pile assembly so as to improve the production capacity.
Further, the specific inclination angle of the cathode electrode and the flow field plate is 10-40 degrees, wherein 15 degrees is the optimal inclination angle.
Further, the electric pile of the utility model comprises the following components stacked in sequence:
the method comprises the steps of sequentially stacking and assembling, namely placing an anode silica gel pad on an anode end plate to ensure close adhesion and no gap, then placing an anode electrode on the anode silica gel pad, placing a flow field plate above the anode electrode to ensure that the direction of the flow field plate is correct and is exactly embedded with an anode electrode bayonet, placing a cathode silica gel pad on the flow field plate, then placing a cathode electrode to ensure that the cathode electrode and the flow field are stably connected through the cathode silica gel pad, placing a cathode current collecting plate above the cathode electrode to supply current for the cathode electrode, then placing a gas plate on the cathode current collecting plate to control the circulation of cathode gas, and finally placing the cathode end plate on the gas plate to complete the assembly of the whole electric pile.
Compared with the prior art, the utility model has the following beneficial effects:
1. According to the utility model, through the unique stacking mode, the electric pile utilizes the synergistic effect among all the components, and under the condition of no need of an ionic membrane, the reaction of the anode and the cathode is carried out in the same reaction cavity through ingenious design, so that hydrogen peroxide can be produced efficiently, and meanwhile, the reasonable distribution of reaction gas and electrolyte on the surface of the electrode is ensured, so that the stable and efficient operation of the electric pile is realized.
2. Based on the cathode two-electron oxygen reduction and anode OER reaction principle, the application utilizes the physical structure and performance characteristics of each part, and ensures that cathode and anode reactions are stably and efficiently carried out in each area under the condition of no separation of ionic membranes. By optimizing the design of the electrode material, the flow field plate, the gas plate and other parts, the reasonable distribution of the reaction gas and the electrolyte on the electrode surface is ensured, the decomposition of the product hydrogen peroxide is avoided, and the normal operation of the galvanic pile under the condition of no ionic membrane is realized.
3. The cost of ion membranes in conventional stacks is typically high, and its procurement cost, replacement cost, potential maintenance cost due to ion membrane failure, etc., account for a significant proportion of the total stack cost. The galvanic pile structure of the utility model bans the ion membrane, and directly reduces the expenditure of high cost. Meanwhile, because special installation and maintenance process requirements related to the ionic membrane are not required to be considered, the labor cost and related auxiliary material cost are correspondingly reduced in the process of assembling and long-term operation and maintenance of the galvanic pile.
4. The application optimizes the distribution and diffusion of the reaction gas on the surface of the cathode through the specific inclination angle design (10-40 degrees, optimal 15 degrees) of the cathode electrode and the flow field plate, and improves the reaction efficiency of the cathode. Through experimental tests, the overall energy conversion efficiency of the electric pile is improved by 30-50% compared with that of the traditional electric pile.
5. In the production of ionic membranes, complex chemical synthesis processes are often involved, which may produce some amount of hazardous waste and pollutant emissions. The use of the ion removal membranes of the present utility model reduces the production of such potential contaminants from galvanic pile production sources. Meanwhile, as the operation reliability of the electric pile is improved, the extra energy consumption and waste emission caused by fault maintenance, component replacement and the like are reduced. In the conventional galvanic pile, due to the existence of the ionic membrane, the assembly process needs to be carefully carried out to ensure the correct installation and sealing of the ionic membrane, and special detection and treatment of the ionic membrane are also required during maintenance. The pile structure of the utility model is more concise and visual, the stacking and mounting mode of each part is easy to operate, and the process complexity and time cost in the assembly process are reduced. In the aspect of maintenance, no special maintenance operation is needed for the ion membrane, and only conventional inspection, cleaning and replacement are needed for each solid part, so that the technical requirements and labor intensity of maintenance personnel are reduced.
Drawings
FIG. 1 is a schematic view of a galvanic pile according to the utility model;
FIG. 2 is a schematic diagram of the electrolyte and gas flow in and out of the galvanic pile according to the utility model;
FIG. 3 is a side view of a reaction cell stack;
FIG. 4 is a graph showing voltage versus time according to an embodiment of the present utility model;
FIG. 5 is a graph showing the relationship between the concentration of hydrogen peroxide effluent and time according to an embodiment of the present utility model;
fig. 6 is a graph of faraday efficiency versus time for an embodiment of the present utility model.
The reference numbers in the figure are 1-anode end plate, 2-anode silica gel pad, 3-anode, 4-flow field plate, 5-cathode silica gel pad, 6-cathode electrode, 7-cathode current collecting plate, 8-gas plate, 9-cathode end plate, 301-anode tab, 401-liquid inlet, 402-liquid outlet, 701-cathode tab, 801-air inlet and 802-air outlet.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
The following detailed description of specific embodiments of the utility model refers to the accompanying drawings, in which:
The ionic membrane-free galvanic pile structure for electrochemical synthesis of hydrogen peroxide is characterized by comprising an anode end plate 1 and a cathode end plate 9 for supporting the internal structure of the galvanic pile, wherein the anode end plate 1 and the cathode end plate 9 are respectively connected with an anode electrode 3 and a cathode electrode 6, a flow field plate 4 for electrolyte circulation and reaction is embedded on the anode electrode 3, a cathode current collecting plate 7 for supplying current to the cathode electrode 6 is arranged on the cathode electrode 6, and a gas plate 8 for controlling cathode gas circulation is arranged between the cathode end plate 9 and the cathode current collecting plate 7.
The anode end plate 1 is tightly attached to the anode electrode 3 through an anode silica gel pad 2, and the flow field plate 4 is tightly attached to the cathode electrode 6 and the cathode current collecting plate 7 is tightly attached to the gas plate 8 through a cathode silica gel pad 5.
The anode electrode 3 and the cathode current collecting plate 7 are respectively provided with an anode tab 301 and a cathode tab 701 which are connected with a power supply cathode and anode.
The flow field plate 4 is provided with a liquid inlet 401 and a liquid outlet 402 for the ingress and egress of electrolyte.
The gas plate 8 is provided with a gas inlet 801 and a gas outlet 802 for the ingress and egress of gas.
The anode silica gel pad 2, the anode electrode 3, the flow field plate 4, the cathode silica gel pad 5, the cathode electrode 6, the cathode current collecting plate 7 and the gas plate 8 are sequentially and repeatedly stacked to form a galvanic pile group so as to improve the production capacity.
The specific inclination angle of the cathode electrode 6 to the flow field plate 4 is between 10 deg. -40 deg., with 15 deg. being the optimal inclination angle.
The electric pile of the utility model comprises the following components stacked in sequence:
The anode end plate 1 serves as one end supporting structure of the electric pile and plays a role in fixing and protecting internal components.
The anode silica gel pad 2 is arranged between the anode end plate 1 and the anode, plays a role of sealing and buffering, prevents electrolyte leakage and ensures good contact between the anode and adjacent parts.
The anode electrode 3 is an electrode for generating an anodic oxygen evolution reaction OER, is prepared from a material with good catalytic activity and stability, and can be a ruthenium iridium titanium plate and foam nickel loaded with iron-nickel so as to promote the efficient progress of the anodic reaction.
Flow field plates 4 for the circulation of electrolyte and to provide a place for the reaction to proceed.
The cathode silica gel pad 5 is positioned between the flow field plate 4 and the cathode electrode 6 and between the cathode current collecting plate 7 and the gas plate 8, and also plays a role in sealing and buffering, so that the sealing performance of a cathode region and the contact stability of the electrode are ensured.
The cathode electrode 6 is used for carrying out core reaction of the device, the two-electron oxygen reduction reaction and the reduction of oxygen to produce hydrogen peroxide, and the preparation method is that hydrophobic carbon paper or hydrophobic carbon cloth is used as a substrate, and carbon black of each two-electron oxygen reduction catalyst or modified catalyst thereof is sprayed on the substrate to form the gas diffusion electrode.
The cathode current collector 7 provides stable electric power support for the cathode electrode 6.
A gas plate 8 for controlling the ingress of the cathode gas oxygen.
The cathode end plate 9, the other end support structure of the stack, corresponds to the anode end plate 1 for protecting the internal components.
The anode end plate 1, the flow field plate 4, the gas plate 8 and the cathode end plate 9 are made of acrylic materials.
The anode electrode 3 is obtained by cutting nickel foam loaded with ferronickel.
And the cathode electrode 6 adopts hydrophobic carbon paper as a substrate and is sprayed with a di-electron oxygen reduction catalyst.
The cathode current collector 7 uses a titanium plate as a current collector.
The stacking and assembling are sequentially carried out, namely, an anode silica gel pad 2 is placed on an anode end plate 1 to ensure close adhesion and no gap, then an anode electrode 3 is placed on the anode silica gel pad 2, a flow field plate 4 is placed above the anode electrode 3 to ensure that the direction of the flow field plate 4 is correct and is exactly jogged with a bayonet of the anode electrode 3, a cathode silica gel pad 5 is placed on the flow field plate 4, then a cathode electrode 6 is placed, the cathode electrode 6 and the flow field are stably connected through the cathode silica gel pad 5, a cathode current collecting plate 7 is placed above the cathode electrode 6 to supply current for the cathode electrode 6, then a gas plate 8 is placed on the cathode current collecting plate 7 to control the circulation of cathode gas, and finally, the cathode end plate 9 is placed on the gas plate 8 to complete the assembling of the whole electric pile.
The cathode and the anode of a power supply are respectively connected with the anode lug 301 of the anode electrode 3, the cathode lug 701 of the cathode current collecting plate 7, 1mol/L sodium hydroxide of electrolyte flows into the flow field plate 4 from the liquid inlet 401, hydrogen peroxide produced by carrying the electrolyte from the liquid outlet 402 enters from the air inlet 801, oxygen flows into the gas plate 8, and out from the air outlet 802, and oxygen generated by the OER reaction of the anode electrode 3 flows out along the anode lug 301 of the anode electrode 3.
In this embodiment, the constant-current method is adopted to stably produce hydrogen peroxide, the current is 1A, the flow rate of electrolyte is 2ml/min, the flow rate of oxygen is 40ml/min, the data recording is carried out after the stable operation is carried out for 2 hours, the recording voltage chart 4, the hydrogen peroxide concentration test chart 5 and the Faraday efficiency calculation chart 6 are carried out every one hour.
During operation of the galvanic pile, OER reaction occurs at the anode electrode 3, the anode electrode 3 is a current collector of the galvanic pile, and di-electron oxygen reduction reaction occurs at the cathode electrode 6. Oxygen enters the gas plate 8 to form a three-phase interface with the cathode gas diffusion electrode and the electrolyte, so that an oxygen supersaturation state is created, the di-electron oxygen reduction reaction is efficiently carried out, and the stable production of hydrogen peroxide by the galvanic pile is realized.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (7)
1. The ionic membrane-free galvanic pile structure for electrochemical synthesis of hydrogen peroxide is characterized by comprising an anode end plate (1) and a cathode end plate (9) which are used for supporting the internal structure of the galvanic pile, wherein the anode end plate (1) and the cathode end plate (9) are respectively connected with an anode electrode (3) and a cathode electrode (6), a flow field plate (4) used for electrolyte circulation and reaction is embedded on the anode electrode (3), a cathode current collecting plate (7) used for providing current for the cathode electrode (6) is arranged on the cathode electrode (6), and a gas plate (8) used for controlling cathode gas circulation is arranged between the cathode end plate (9) and the cathode current collecting plate (7).
2. The structure of an ion-free membrane stack for electrochemical synthesis of hydrogen peroxide according to claim 1, wherein the anode end plate (1) is tightly attached to the anode electrode (3) through an anode silica gel pad (2), and the flow field plate (4) is tightly attached to the cathode electrode (6) and the cathode current collecting plate (7) is tightly attached to the gas plate (8) through a cathode silica gel pad (5).
3. The ion-free membrane stack structure for electrochemical synthesis of hydrogen peroxide according to claim 2, wherein the anode electrode (3) and the cathode current collecting plate (7) are respectively provided with an anode tab (301) and a cathode tab (701) which are connected with a power supply cathode and an anode.
4. An ion-free membrane stack structure for electrochemical synthesis of hydrogen peroxide according to claim 3, wherein the flow field plate (4) is provided with a liquid inlet (401) and a liquid outlet (402) for the ingress and egress of electrolyte.
5. The ion-free membrane stack structure for electrochemical synthesis of hydrogen peroxide according to claim 4, wherein the gas plate (8) is provided with a gas inlet (801) and a gas outlet (802) for gas inlet and outlet.
6. The ion-free membrane stack structure for electrochemical synthesis of hydrogen peroxide according to any one of claims 2-5, wherein the anode silica gel pad (2), the anode electrode (3), the flow field plate (4), the cathode silica gel pad (5), the cathode electrode (6), the cathode current collecting plate (7) and the gas plate (8) are stacked repeatedly in sequence to form a stack assembly.
7. An ion-free membrane stack structure for electrochemical synthesis of hydrogen peroxide according to claim 6, wherein the inclination angle of the cathode electrode (6) and the flow field plate (4) is between 10 ° -40 °, wherein 15 ° is the optimal inclination angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202423163859.2U CN223879854U (en) | 2024-12-21 | 2024-12-21 | An ion-free membrane stack structure for the electrochemical synthesis of hydrogen peroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202423163859.2U CN223879854U (en) | 2024-12-21 | 2024-12-21 | An ion-free membrane stack structure for the electrochemical synthesis of hydrogen peroxide |
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| Publication Number | Publication Date |
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| CN223879854U true CN223879854U (en) | 2026-02-06 |
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| CN202423163859.2U Active CN223879854U (en) | 2024-12-21 | 2024-12-21 | An ion-free membrane stack structure for the electrochemical synthesis of hydrogen peroxide |
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| CN (1) | CN223879854U (en) |
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