Flow channel electrode tip for testing sheet electrode by rotating device
By designing the flow channel in the flow channel electrode head of the rotating device, the problem of bubble adhesion in the rotating membrane electrode head was solved, enabling more accurate and efficient membrane electrode testing. This method is adaptable to rotating testing devices of different brands and models, improving the reliability and efficiency of the test.
Patent Information
- Application Number
- CN202421992502.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-08-16
AI Technical Summary
In existing technologies, air bubbles adhere and aggregate during the testing process of the rotating membrane electrode head, which hinders the testing of membrane electrode performance and may even cause open circuits, affecting the accuracy and reliability of the test results.
Design a flow channel electrode head for a rotating device, including a flow channel electrode nut and a rotating film electrode head. The top of the flow channel electrode nut is provided with multiple flow channels to quickly expel air bubbles through forced convection, and it is compatible with different brands and models of rotating testing devices.
It effectively solves the problem of bubble adhesion, improves the accuracy and reliability of membrane electrode testing, adapts to the testing needs of electrodes of different sizes, and enhances the versatility and testing efficiency of the rotating device.
Smart Images
Figure CN223538817U_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of electrochemical technology, and in particular relates to a flow channel electrode head for testing sheet electrodes using a rotating device. Background Technology
[0002] The diffusion layer of a stationary electrode is a thin region near the electrode surface. Due to the electrochemical reaction, a concentration gradient of reactants and products forms between the electrode surface and the bulk solution, directly affecting the reaction rate and mechanism at the electrode surface. Rotating disk electrodes (RDEs) and rotating ring disk electrodes (RRDEs) overcome some limitations of traditional stationary and vibrating wire electrodes, such as uneven current density distribution and low mass transfer rates. High-speed rotating RDEs establish a uniform and stable diffusion state on the electrode surface through forced convection, allowing for the study of the intrinsic relationship between mass transport, fluid dynamics, and electrode reaction rates and reaction kinetics. Levich first proposed the theory of rotating disk electrodes in 1942, and Siver and Kabaonv experimentally verified Levich's theory in 1949. RDE is not only widely used in electroplating and metal corrosion, but also particularly suitable for basic electrochemical research (oxygen reduction reaction (ORR), hydrogen evolution reaction (HER), oxygen evolution reaction (OER)), and plays an indispensable role, especially in the development of new energy catalysts and membrane electrodes.
[0003] Traditional RDE / RRDE tests first prepare the catalyst into a test slurry, then uniformly load it onto the surface of a rotating electrode head using methods such as drop coating, spin coating, or spray coating. The rotation of the RDE / RRDE creates forced convection, increasing the mass transfer rate and rapidly assessing the catalyst's activity and stability. However, the results are often only suitable for trend prediction and preliminary screening of catalysts. Membrane electrode assemblies (MEAs), comprising a gas diffusion layer (GDL), a catalyst layer (CL), and a proton exchange membrane (PEM), are complex, multi-layered working electrodes. Their testing process more closely resembles real-world application environments. MEA testing complements the limitations of traditional rotating disk electrode RDE, which only tests specific catalysts.
[0004] Combining membrane electrode assembly (MEA) testing with reactive energy transfer (RDE) testing to form a novel and effective RDE testing method for MEAs can more accurately simulate real-world application conditions. This method not only provides information on catalyst activity and stability but also considers the mass transfer impedance of the MEA in actual operating environments, providing a scientific basis for the application of MEAs in fuel cells, water electrolysis, carbon dioxide reduction, and other practical electrochemical devices in new energy sources. Compared to static MEA testing, rotating MEAs, by creating forced convection and increasing the mass transfer rate through rotation, can more effectively and realistically evaluate the electrochemical performance of MEAs under actual operating conditions. The continuous development and improvement of MEA RDE testing technology will ultimately contribute to the development of energy conversion and storage technologies.
[0005] However, for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), because the rotating membrane electrode head is facing downwards and immersed in the electrolyte, the hydrogen / oxygen density generated on the membrane electrode surface during testing is lower than the electrolyte density. This causes bubbles to adhere to the membrane electrode surface, hindering performance testing. Severe bubble accumulation can even create an open circuit and burn out the membrane electrode. Although rotation can create forced convection on the membrane electrode head surface, accelerating bubble detachment to some extent, current conventional membrane electrode caps do not completely eliminate the impact of bubbles on membrane electrode testing. Summary of the Invention
[0006] In view of this, the present invention aims to provide a flow channel electrode head for testing sheet electrodes in a rotating device, thus enabling the testing of membrane electrodes on a rotating RDE / RRDE device.
[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:
[0008] A flow channel electrode head for testing sheet electrodes using a rotating device includes a flow channel electrode nut and a rotating film electrode head threadedly connected thereto. The flow channel electrode nut has a through hole at its center and a plurality of flow channels at its top, which extend outward along the through hole to the outer circumferential surface of the flow channel electrode nut.
[0009] Furthermore, the number of flow channels is 2-10. Preferably, the number of flow channels is 6.
[0010] Furthermore, the width of the flow channel is 0.1-1 cm and the depth is 0.001-1.0 mm. Preferably, the width of the flow channel is 0.2 cm and the depth is 0.01 mm. More preferably, the width of the flow channel is 0.3 cm and the depth is 0.05 mm.
[0011] Furthermore, the inner surface of the flow channel electrode nut is provided with an internal thread, and the top of the rotating film electrode head is provided with an external thread that mates with the internal thread.
[0012] Furthermore, a conductor is installed on the top of the rotating film electrode head, and after the rotating film electrode head is assembled with the flow channel electrode nut, the conductor is located at the center of the through hole.
[0013] Furthermore, the flow channel electrode nut and the rotating film electrode head are made of insulating plastic. Specifically, insulating plastics such as polytetrafluoroethylene (PTFE) and polyetheretherketone (PEEK) can be selected.
[0014] Furthermore, the conductor is made of a conductive material. Specifically, conductive materials such as glassy carbon (GC), gold (Au), silver (Ag), platinum (Pt), copper (Cu), titanium (Ti), and stainless steel can be selected.
[0015] In addition, this invention also provides the application of the above-mentioned flow channel electrode head in linear sweep voltammetry (LSV) testing of sheet electrodes using a rotating device.
[0016] Compared with the prior art, the flow channel electrode head for testing sheet electrodes in a rotating device according to this invention has the following advantages:
[0017] (1) The flow channel electrode head for testing sheet electrodes using a rotating device described in this utility model solves the technical difficulty of rapid discharge of bubbles from the membrane electrode surface by designing a flow channel at the top of the flow channel electrode nut and using RDE rotation testing to form forced convection.
[0018] (2) The flow channel electrode head for testing sheet electrodes of rotating devices described in this utility model can be adapted to connect to different brands and models of rotating testing devices (rotating disc electrode RDE and rotating ring disc electrode RRDE, etc.) by changing the thread type and size at the tail of the electrode head.
[0019] (3) The flow channel electrode head for testing sheet electrodes in the rotating device described in this utility model realizes the integrated conductive connection of the flow channel electrode nut, sheet electrode / membrane electrode and rotating membrane electrode head.
[0020] (4) The plate electrode for testing rotating devices described in this utility model can be adapted to the testing needs of electrodes of different sizes by changing the opening size of the flow channel electrode nut. Attached Figure Description
[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0022] Figure 1 This is an exploded view of the flow channel electrode head for testing sheet electrodes using a rotating device, as described in an embodiment of this utility model.
[0023] Figure 2 This is a perspective view of the flow channel electrode head for testing sheet electrodes using a rotating device, as described in an embodiment of this utility model.
[0024] Figure 3 This is a front view of the flow channel electrode nut described in an embodiment of the present invention;
[0025] Figure 4 This is a 3D view of a standard electrode head;
[0026] Figure 5 Cyclic voltammetry curves of flow channel electrode head and conventional electrode head at different rotation speeds;
[0027] Figure 6 Cyclic voltammetry test curves of the flow channel electrode tip and the conventional electrode tip at a speed of 1600 RPM, ranging from 0V to 0.80V;
[0028] Figure 7 The cyclic voltammetry test curves of the flow channel electrode tip and the conventional electrode tip at a speed of 1600 RPM are 0.70V-0.80V.
[0029] Explanation of reference numerals in the attached figures:
[0030] 1. Flow channel electrode nut; 2. Rotary film electrode head; 3. Through hole; 4. Flow channel; 5. Internal thread; 6. External thread; 7. Conductor; 8. Conventional electrode nut. Detailed Implementation
[0031] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0035] This invention provides a flow channel electrode head for testing sheet electrodes using a rotating device, such as... Figure 1 , Figure 2 and Figure 3 As shown, the device includes a flow channel electrode nut 1 and a rotating film electrode head 2 threadedly connected to it. A through hole 3 is formed at the center of the flow channel electrode nut 1, and several flow channels 4 are provided on the top of the flow channel electrode nut 1, extending outwards along the through hole to the outer circumferential surface of the flow channel electrode nut 1. A conductor 7 is mounted on the top of the rotating film electrode head 2. After the rotating film electrode head 2 is assembled with the flow channel electrode nut 1, the conductor 7 is located at the center of the through hole 3.
[0036] In practical applications, the number of flow channels 4 on the top of the flow channel electrode nut 1 can be selected as 2, 3, 4, 5, or 6. The width of the flow channels 4 is 0.1-0.5 cm, which can be selected as 0.1 cm, 0.2 cm, 0.3 cm, 0.4 cm, 0.5 cm, etc., and the depth is 0.001-1 mm, which can be selected as 0.001 mm, 0.005 mm, 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, etc. During the actual design of the flow channel electrode nut 1, the number of flow channels 4 and the width and depth of the flow channels 4 can be adjusted according to the size of the flow channel electrode nut 1 to more effectively and realistically evaluate the electrochemical performance of the membrane electrode under actual operating conditions.
[0037] The inner surface of the flow channel electrode nut 1 is provided with an internal thread 5, and the top of the rotating film electrode head 2 is provided with an external thread 6 that mates with the internal thread 5. In actual use, by changing the model and size of the internal thread 5 and the external thread 6, the rotating film electrode head can be adapted to connect to rotating test devices (rotating disc electrode RDE and rotating ring disc electrode RRDE, etc.) of different brands and models.
[0038] The flow channel electrode nut 1 and the rotating diaphragm electrode head 2 are made of insulating plastic. For example, the materials of the flow channel electrode nut 1 and the rotating diaphragm electrode head 2 can be selected as insulating plastics such as polytetrafluoroethylene (PTFE) and polyetheretherketone (PEEK).
[0039] The conductor 7 is made of a conductive material. For example, the material of the conductor 7 can be selected from conductive materials such as glassy carbon (GC), gold (Au), silver (Ag), platinum (Pt), copper (Cu), titanium (Ti), and stainless steel.
[0040] Example
[0041] A flow channel electrode head for testing sheet electrodes using a rotating device, such as Figure 1 and Figure 2 As shown, the device includes a flow channel electrode nut 1 and a rotating film electrode head 2 threadedly connected to it. The flow channel electrode nut 1 has a through hole 3 at its center, and six flow channels 4 are provided on its top. The width of each flow channel 4 is 0.3 cm, and its depth is 0.05 mm. The flow channels 3 extend outward along the through hole to the outer circumferential surface of the flow channel electrode nut 1. A conductor 7 is mounted on the top of the rotating film electrode head 2. After the rotating film electrode head 1 and the flow channel electrode nut 2 are assembled, the conductor 7 is located at the center of the through hole 3.
[0042] The flow channel electrode nut 1 and the rotating film electrode head 2 are made of polytetrafluoroethylene (PTFE), and the conductor 7 is made of glassy carbon (GC).
[0043] Comparative example: A conventional electrode tip has the following structure. Figure 4 As shown, except that the electrode nut is a conventional motor nut 8 which differs from the embodiment, everything else is the same.
[0044] Using the flow channel electrode nut in the example, the sheet electrode (felt sample) to be tested is placed and fixed on the top of the rotating film electrode head to assemble a flow channel electrode head with the test sample. The same method is used to assemble a conventional electrode head with the test sample.
[0045] The following specific test examples demonstrate the test results of the flow channel electrode head described in this invention compared to conventional electrode heads.
[0046] Test case
[0047] Test subjects: the flow channel electrode head provided in the embodiment and the conventional electrode head provided in the comparative example.
[0048] Test equipment: The equipment used for testing is a rotating ring electrode, manufactured by EPDE GmbH, Germany, model RRDE.
[0049] Test method:
[0050] The specific steps are as follows: Insert the sample-loaded flow channel electrode head and the sample-loaded conventional electrode head into the test electrolytic cell containing the reference electrode, counter electrode, aeration tube, etc., connect to the electrochemical workstation, set the test program and test parameters, and perform electrochemical testing. Specifically, the test program is: linear scan LSV, and the test parameters are: voltage range -0.2V to 0.8V relative to the silver chloride reference electrode, scan rate 10mV / s, rotation speed: 400RPM, 900RPM, 1600RPM, 2500RPM.
[0051] Test results: The test results are as follows Figures 5-7 As shown.
[0052] Results analysis: From Figures 5-7 As can be seen, the 1600 RPM test curve of the conventional electrode tip exhibits significant fluctuations after reaching the high potential region (0.75 V). This phenomenon indicates that bubbles generated on the membrane electrode surface cannot be smoothly and quickly expelled. On one hand, the accumulation of bubbles on the membrane electrode surface hinders the active sites of the membrane electrode. Therefore, at the same voltage, the test activity of the conventional electrode tip is lower than that of the flow channel electrode tip (0.0007 A for the conventional electrode tip and 0.001 A for the flow channel electrode tip at 0.75 V). On the other hand, the bursting of bubbles after accumulation on the membrane electrode surface causes instantaneous disturbances to the test curve. Thus, the fluctuations in the test curve of the conventional electrode tip membrane electrode are much greater than those of the flow channel electrode tip membrane electrode.
[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A flow channel electrode head for testing sheet electrodes using a rotating device, characterized in that: It includes a flow channel electrode nut and a rotating film electrode head that is threadedly connected to it. The flow channel electrode nut has a through hole at its center and several flow channels at its top. The flow channels extend outward along the through hole to the outer circumferential surface of the flow channel electrode nut.
2. The flow channel electrode head for testing sheet electrodes using a rotating device according to claim 1, characterized in that: The number of flow channels is 2-10.
3. The flow channel electrode head for testing sheet electrodes using a rotating device according to claim 1, characterized in that: There are 6 flow channels.
4. The flow channel electrode head for testing sheet electrodes using a rotating device according to claim 1, characterized in that: The width of the flow channel is 0.1-0.5cm and the depth is 0.001-1.0mm.
5. The flow channel electrode head for testing sheet electrodes using a rotating device according to claim 1, characterized in that: The width of the flow channel is 0.2 cm and the depth is 0.01 mm.
6. The flow channel electrode head for testing sheet electrodes using a rotating device according to claim 1, characterized in that: The inner surface of the flow channel electrode nut is provided with an internal thread, and the top of the rotating film electrode head is provided with an external thread that mates with the internal thread.
7. The flow channel electrode head for testing sheet electrodes using a rotating device according to claim 1, characterized in that: A conductor is mounted on the top of the rotating film electrode head. After the rotating film electrode head is assembled with the flow channel electrode nut, the conductor is located at the center of the through hole.
8. The flow channel electrode head for testing sheet electrodes using a rotating device according to claim 1, characterized in that: The flow channel electrode nut and the rotating film electrode head are made of insulating plastic.
9. The flow channel electrode head for testing sheet electrodes using a rotating device according to claim 7, characterized in that: The conductor is made of a conductive material.