Preparation method of micron-sized ring-disc electrode with low cost and high collection rate

Abstract

The invention discloses a preparation method of a low-cost and high-collection-rate micron-sized ring-disc electrode, which comprises the following steps: firstly, obtaining a micron-sized disc electrode through local heating and stretching, and then coating the outer wall of the disc electrode with pre-configured carbon glue through a coating method to form a micron-sized ring electrode. And finally, the micron-sized ring-disc electrode with good conductivity and excellent electrochemical performance is prepared through the steps of packaging, grinding, polishing and the like. According to the method, for preparation of the disc electrode in the micron-sized ring-disc electrode, the problem of electrode preparation failure caused by the fact that a gap is easily formed between an electrode insulating wall and an electrode material is effectively solved; for preparation of the ring electrode in the micron-sized ring-disc electrode, a traditional chemical vapor deposition method and a traditional magnetron sputtering method are omitted, the process is simple, and complex chemical reaction and physical processes are not involved; the cost is low, and expensive equipment and reagents are not needed; the obtained electrode material is relatively good in adhesiveness; the method can be used for high-sensitivity detection of trace reaction products or intermediate products.

Description

Technical Field

[0001] The invention belongs to the technical field of electrochemical detection, and in particular relates to a method for preparing a low-cost, high-collection-rate micrometer-level ring-disk electrode. Background Art

[0002] Dual-channel electrodes have significant advantages in the field of electrochemistry, such as improved signal quality and enhanced versatility. They can be used to explore reaction kinetics, achieve selective detection, and support real-time monitoring. These characteristics make them play an important role in many application fields, including sensor technology for environmental monitoring and biosensors, electrode material research for lithium-ion batteries and fuel cells, reaction optimization in electrochemical synthesis, research on material corrosion behavior, and applications in bioelectrochemical reactions. Dual-channel electrodes have shown broad prospects in promoting electrochemical research and industrial development.

[0003] Common dual-channel electrodes mainly include rotating ring disk electrode (RRDE), interdigitated array electrodes (IDA), scanning electrochemical microscopy (SECM) electrodes, etc. Although they all play a very important role in the field of electrochemistry, they cannot simultaneously meet the requirements of low cost, easy preparation, high collection rate, large signal-to-noise ratio, and high detection sensitivity. RRDE has a dual-channel working mode and is one of the important tools for electrochemical measurement. It is widely used in the research of modern electroanalytical chemistry, electrode processes and homogeneous chemical reactions. For example, RRDE is widely used in the research of oxygen reduction reaction (ORR), carbon dioxide reduction reaction (CO2RR), metal oxide degradation, etc. However, the forced convection carried out during the use of RRDE will bring large noise, high current detection limit, and low sensitivity. The electrode size is large and the spacing between the two electrodes is wide, resulting in a low collection rate of the electrode. In addition, the forced convection required during use greatly increases the detection noise and reduces the signal-to-noise ratio of the test. IDA has a high collection rate and sensitivity, and can be applied to different fields such as the study of the microscopic mechanism of electrocatalytic reactions, the study of trace electroanalysis of neurotransmitter activity, and the monitoring of enzyme catalysis. However, the preparation of high-precision IDA requires complex photolithography processes and is costly. SECM works based on the principle of electrochemistry. It uses a bipotentiostat to connect the probe, substrate, counter electrode and reference electrode, and obtains relevant reaction information based on the electrochemical current of the oxidation and reduction of substances in a small spatial area. It can be applied to the study of electrochemical reactions at solid-liquid interfaces, liquid-liquid interfaces or liquid-gas interfaces. SECM uses ultramicroelectrodes as scanning probes to measure the in-situ current generated by electrochemical reactions near the substrate surface, and to study local electrochemical activity with high spatial resolution. However, its equipment cost is more expensive, which limits its application.

[0004] However, in the process of preparing the disk electrode in the existing ring-disk electrode, a gap is easily formed between the electrode insulating wall and the electrode material, which leads to the failure of electrode preparation. The preparation of the ring electrode in the existing ring-disk electrode mainly relies on chemical vapor deposition or magnetron sputtering. Although this method can achieve better adhesion between the deposited material and the substrate, it has high requirements for the regulation of instruments and operating conditions, the process flow is relatively complicated, and it takes a long time, especially the construction and maintenance of the magnetron sputtering equipment require high costs; more importantly, the ring electrode obtained by the magnetron sputtering method is relatively small in thickness, which will directly affect the electrochemical performance of the micron-scale ring-disk electrode and reduce the collection rate. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a method for preparing a micron-sized ring-disk electrode with low cost and high collection rate. The technical problem to be solved by the present invention is achieved by the following technical solution:

[0006] The embodiment of the present invention provides a method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode, the method comprising:

[0007] The preselected metal electrode material and non-metal electrode material are sealed into a glass capillary, and the glass capillary is locally heated, stretched, and melted using a stretching instrument to obtain a melted glass capillary;

[0008] The melted glass capillary is immersed in a hydrophobic solution for hydrophobic pretreatment to obtain a treated glass capillary; a metal wire is introduced from the open end of the treated glass capillary, and the metal wire is connected to the electrode material in the treated glass capillary by using silver paste to form a micron-scale disk electrode;

[0009] A solid carbon film is formed on the outer wall of a glass capillary of a micrometer-sized disk electrode by using a pre-configured carbon glue;

[0010] Fixing a metal wire to the end of the solid carbon film to form a micrometer-sized ring electrode;

[0011] The glass capillary outer tube is sheathed on the outer side of the micrometer-sized ring electrode, which is encapsulated by epoxy resin, and then ground, polished and electrochemically tested to obtain a micrometer-sized ring-disk electrode.

[0012] In one embodiment of the present invention, the preselected metal electrode material includes:

[0013] Platinum and gold wire.

[0014] In one embodiment of the present invention, the preselected non-metallic electrode material includes: carbon fiber.

[0015] In one embodiment of the present invention, a preselected metal electrode material and a non-metal electrode material are sealed into a glass capillary, and the glass capillary is locally heated, stretched, and melted using a stretching apparatus to obtain a melted glass capillary, comprising:

[0016] The preselected metal electrode material and the non-metal electrode material are cut to the same length as the glass capillary, and the cut metal electrode material and the non-metal electrode material are cleaned and dried to obtain a treated electrode material;

[0017] The processed electrode material is sealed in a glass capillary, the position of the glass capillary is calibrated, the glass capillary is placed in the heating center of the tensile tester, and the glass capillary is fixed;

[0018] The glass capillary is locally heated by using a stretching instrument, and the two ends of the glass capillary are stretched to melt the heated parts of the glass capillary, thereby obtaining a melted glass capillary.

[0019] In one embodiment of the present invention, the melted glass capillary is immersed in a hydrophobic solution for hydrophobic pretreatment to obtain a treated glass capillary, comprising:

[0020] Prepare the hydrophobic solution in a glove box with preset environment;

[0021] Soaking the melted glass capillary in the hydrophobic solution for 30-40 minutes;

[0022] The soaked glass capillary is taken out and naturally dried in the shade to obtain a treated glass capillary.

[0023] In one embodiment of the present invention, the diameter of the metal wire is smaller than the inner diameter of the glass capillary.

[0024] In one embodiment of the present invention, a solid carbon film is formed on the outer wall of a glass capillary of a micron-sized disk electrode using a pre-configured carbon glue, comprising:

[0025] The pre-configured carbon glue is uniformly coated on the outer wall of the glass capillary of the micron-sized disk electrode by using a brush to form the solid carbon film.

[0026] In one embodiment of the present invention, the pre-configured carbon glue is composed of an acetone diluent and carbon glue mixed in a preset ratio.

[0027] In one embodiment of the present invention, the inner diameter of the outer glass capillary is greater than the outer diameter of the glass capillary.

[0028] In one embodiment of the present invention, a glass capillary outer tube is sheathed on the outer side of the micrometer-sized ring electrode, encapsulated with epoxy resin, and then ground, polished and electrochemically tested to obtain a micrometer-sized ring-disk electrode, including:

[0029] Sheathing a glass capillary outer tube on the outer side of the micrometer-sized ring electrode and encapsulating it with epoxy resin to obtain an encapsulated electrode;

[0030] The excess epoxy resin on the surface of the packaged electrode is removed by grinding, and then polished to obtain a polished electrode;

[0031] The polished electrode is electrochemically tested using a test solution. If the preset requirements are met, a micron-sized ring-disk electrode is obtained. If the preset requirements are not met, grinding, polishing and electrochemical testing are continued until the preset requirements are met to obtain a micron-sized ring-disk electrode.

[0032] Beneficial effects of the present invention:

[0033] The present invention provides a method for preparing a micron-sized ring-disk electrode composed of different electrode materials, wherein the disk electrode is prepared by stretching the electrode material sealed in a glass capillary into a conical needle tip, and the ring electrode is prepared by directly coating a pre-configured carbon glue to form a solid carbon film; wherein the preparation of the ring electrode is the key to obtaining a good dual-channel micron-sized ring-disk electrode, which directly affects the test performance of the electrode.

[0034] For the preparation of disk electrodes in micrometer-scale ring-disk electrodes, the present invention proposes a hydrophobic pretreatment of electrode raw materials based on the common preparation method, which effectively solves the problem of electrode preparation failure caused by the easy formation of gaps between the electrode insulating wall and the electrode material.

[0035] For the preparation of the ring electrode in the micron-scale ring-disk electrode, compared with the traditional chemical vapor deposition method and magnetron sputtering method, the preparation method of the ring electrode provided by the present invention has the following advantages: (1) the process is simple and does not involve complicated chemical reactions and physical processes; (2) the cost is low and no expensive equipment and reagents are required; (3) the obtained electrode material has good adhesion, the thickness of the ring electrode material can be controlled to reach tens of microns, the adhesion between the ring electrode material and the insulating layer is strong, and there is no shedding.

[0036] Therefore, the micron-scale ring-disk electrode prepared by the preparation method proposed in the present invention has a small size and a high collection rate, can exhibit good electrochemical detection performance, and can be used for high-sensitivity detection of trace reaction products or intermediates. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the steps of a method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode provided by an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of optical images of micron-scale disk electrode prototypes of different electrode materials after being stretched at different stretching parameters provided by an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of the state of a glass capillary in a disk electrode before and after hydrophobic treatment provided by an embodiment of the present invention;

[0040] Figure 4 A process flow chart of a micron-scale ring-disk electrode provided by an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of the cross-sectional structure of a micrometer-scale ring-disk electrode provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0043] The present invention provides a method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode. Figure 1 As shown, it may include:

[0044] S1, sealing the preselected metal electrode material and non-metal electrode material into a glass capillary, and using a stretching instrument to locally heat, stretch, and fuse the glass capillary to obtain a fused glass capillary.

[0045] For S1, this may include:

[0046] S11, cutting the preselected metal electrode material and non-metal electrode material to the same length as the glass capillary, cleaning and drying the cut metal electrode material and non-metal electrode material to obtain treated electrode material.

[0047] Specifically, the pre-selected metal electrode materials may include:

[0048] Platinum and gold wire.

[0049] Preselected non-metallic electrode materials may include: carbon fiber.

[0050] It is understandable that the preselected metal electrode materials include but are not limited to platinum wire and gold wire, and the preselected non-metal electrode materials include but are not limited to carbon fiber. The diameter of the platinum wire can be within 100 μm, the diameter of the gold wire can be within 100 μm, and the diameter of the carbon fiber can be within 100 μm; the size of the selected glass capillary can be: the inner diameter is not less than 0.2 mm, and the outer diameter is not greater than 2.0 mm.

[0051] S12, sealing the processed electrode material into a glass capillary, calibrating the position of the glass capillary, placing the glass capillary at the heating center of the tensile tester, and fixing the glass capillary.

[0052] Specifically, after the center of the glass capillary is placed at the heating center of the tensile tester, the glass capillary can be fixed by tightening the threads to prevent it from shaking left and right.

[0053] S13, locally heating the glass capillary using a stretching instrument, stretching both ends of the glass capillary to melt the heated portion of the glass capillary, and obtaining a melted glass capillary.

[0054] Specifically, the stretching parameters of the stretching instrument are set, and the stretching instrument is operated. The heating end of the stretching instrument starts to heat the glass capillary and the electrode material embedded therein. When the glass capillary and the electrode material embedded therein are heated to begin to melt, the stretching instrument starts to stretch the glass capillary and the electrode material embedded therein according to the set stretching parameters (such as strength, etc.). The glass capillary and the electrode material embedded therein begin to melt from the heating part to obtain a melted glass capillary. It can be understood that deformation and fracture will occur during the melting process of the glass capillary and the electrode material embedded therein, thereby forming two melted glass capillaries with long conical tips. Either of the two melted glass capillaries can be used to generate micron-scale disk electrodes.

[0055] Optional, schematic diagram of optical images of micron-scale disk electrode prototypes of different electrode materials after stretching at different stretching parameters, see Figure 2 . Figure 2 (a), (b) and (c) show the optical images of the micron-scale disk electrode prototype after the gold wire is stretched at different stretching parameters. Figure 2 (d), (e) and (f) show the optical images of the micron-scale disk electrode prototype after the platinum wire is stretched at different stretching parameters. Figure 2 (g), (h) and (i) show the optical images of the micron-scale disk electrode prototype after the carbon fiber is stretched at different stretching parameters. Figure 2 It can be seen that different stretching parameters correspond to different electrode materials, which will affect the morphology of the final electrode. Through a large number of trial and error experiments, the corresponding stretching parameters for different glass capillary sizes and different electrode materials can be determined.

[0056] S2, immersing the melted glass capillary in a hydrophobic solution for hydrophobic pretreatment to obtain a treated glass capillary; inserting a metal wire from the open end of the treated glass capillary, and connecting the metal wire with the electrode material in the treated glass capillary using silver paste to form a micron-scale disk electrode.

[0057] For S2, this may include:

[0058] S21, immersing the melted glass capillary in a hydrophobic solution for hydrophobic pretreatment to obtain a treated glass capillary.

[0059] Specifically, S21 may include:

[0060] S211, preparing a hydrophobic solution in a glove box with a preset environment.

[0061] The preset environment can be an anhydrous, ultra-low oxygen environment.

[0062] S212, soaking the melted glass capillary in a hydrophobic solution for 30-40 minutes.

[0063] See the schematic diagram of the state of the glass capillary in the disk electrode before and after the hydrophobic treatment provided by the embodiment of the present invention. Figure 3 , Figure 3 It can be seen that the entire fused glass capillary is immersed in a hydrophobic solution, so that the hydrophobic solution enters the gap between the electrode material and the glass capillary, thereby changing the inner wall structure of the glass capillary and making it hydrophobic. The entire operation needs to be carried out in an environment without water and with ultra-low oxygen content.

[0064] S213, taking out the soaked glass capillary and drying it naturally in the shade to obtain a treated glass capillary.

[0065] It can be understood that the embodiment of the present invention effectively prevents the solution from entering the gap through the hydrophobic treatment step, thereby solving the problems of poor electrochemical performance and reduced success rate of electrode preparation caused by the hydrophobic treatment.

[0066] S22, inserting a metal wire from the open end of the treated glass capillary, and connecting the metal wire to the electrode material in the treated glass capillary using silver paste to form a micron-sized disk electrode.

[0067] See the process flow chart of a micron-scale ring-disk electrode provided in an embodiment of the present invention. Figure 4 ,from Figure 4 As can be seen from the left part of the figure, the metal wire used for current conduction is cut to a suitable length with reference to the length of the selected glass capillary, and the metal wire is connected to the electrode material in the treated glass capillary using conductive silver paste, as shown in FIG. Figure 4 As shown in the left part of FIG, a micron-scale disk electrode is formed.

[0068] The diameter of the metal wire is smaller than the inner diameter of the glass capillary.

[0069] It can be understood that for the preparation of the disk electrode in the micron-scale ring-disk electrode, the embodiment of the present invention proposes hydrophobic pretreatment of the electrode raw materials on the basis of the common preparation method, which effectively solves the problem of electrode preparation failure caused by the easy formation of gaps between the electrode insulating wall and the electrode material.

[0070] S3, forming a solid carbon film on the outer wall of the glass capillary of the micron-sized disk electrode by using the pre-configured carbon paste.

[0071] Specifically, S3 may include:

[0072] The pre-configured carbon glue is evenly coated on the outer wall of the glass capillary of the micron-sized disk electrode by using a brush to form a solid carbon film.

[0073] Optionally, the pre-configured carbon glue is composed of acetone diluent and carbon glue mixed in a preset ratio. The preset ratio can be acetone diluent and carbon glue mixed in a volume ratio of 1:10. The diluted pre-configured carbon glue is applied in a simple manner, such as Figure 4 As shown in the middle part of the figure, a nanoscale solid carbon film is formed on the outer wall of the micron-scale disk electrode.

[0074] S4, fixing the metal wire to the end of the solid carbon film to form a micrometer-sized ring electrode.

[0075] Specifically, S4 may include:

[0076] After the pre-configured carbon glue is completely solidified, a metal wire for current conduction is wound and fixed on the outer wall of the glass capillary coated with the pre-configured carbon glue, so as to conduct the micron-sized ring electrode.

[0077] S5, a glass capillary outer tube is put on the outer side of the micrometer-sized ring electrode, encapsulated with epoxy resin, and then subjected to grinding, polishing and electrochemical testing to obtain a micrometer-sized ring-disk electrode.

[0078] For S5, this may include:

[0079] S51, putting the glass capillary outer tube on the outer side of the micrometer-sized ring electrode and encapsulating it with epoxy resin to obtain a packaged electrode.

[0080] It can be understood that the inner diameter of the outer glass capillary is greater than the outer diameter of the glass capillary.

[0081] Optionally, a larger silicate glass capillary outer tube (eg, inner diameter 1.1 mm, outer diameter 1.5 mm) is sheathed on the outside of the micrometer-sized ring electrode and encapsulated with epoxy resin to obtain a packaged electrode.

[0082] S52, removing excess epoxy resin from the surface of the packaged electrode by grinding, and then polishing to obtain a polished electrode.

[0083] It is understandable that the excess epoxy resin can be removed by a grinding method combining mechanical grinding (rough grinding) and manual grinding (fine grinding). After fine polishing with polishing powder, a micron-sized ring-disk electrode with good electrical signal can be obtained.

[0084] S53, using a test solution to perform an electrochemical test on the polished electrode, if the preset requirements are met, a micron-sized ring-disk electrode is obtained, if not, grinding and polishing and electrochemical testing are continued until the preset requirements are met to obtain a micron-sized ring-disk electrode. The micron-sized ring-disk electrode finally obtained is as follows Figure 4 As shown in the right part of .

[0085] The electrochemical test may be a cyclic voltammetry test, through which the electrochemical performance of the micrometer-sized ring-disk electrode can be observed.

[0086] A schematic diagram of the cross-sectional structure of a micrometer-scale ring-disk electrode provided in an embodiment of the present invention is shown in FIG. Figure 5 ,from Figure 5 It can be seen that the micron-scale ring-disk electrode is mainly composed of three parts: a micron-scale disk electrode, an insulating layer, and a micron-scale ring electrode; the diameter of the micron-scale disk electrode is usually not greater than 100μm, the thickness of the insulating layer does not exceed 20μm, and the thickness of the micron-scale ring electrode is equal to or less than 100μm.

[0087] The micron-sized ring-disk electrode prepared in the embodiment of the present invention has a unique structure and micron-sized size, thereby ensuring that the material transfer mode between the disk electrode and the ring electrode surface is realized by spontaneous diffusion, which is easier to reach a steady state, avoiding the disturbance noise caused by the forced convection of the traditional rotating ring-disk electrode, and thus can obtain a larger signal-to-noise ratio and higher sensitivity, and can be used for the detection of some low-concentration targets; the micron-sized ring-disk electrode has excellent electrochemical performance, the electrode charging current is small, and in the dual working electrode mode, there is a narrow spacing between the ring and disk electrodes, which is conducive to the material transfer and exchange between the two electrodes, thereby obtaining a higher collection rate, and can capture lower concentration intermediates. Structurally, the micron-sized ring-disk electrode prepared in the embodiment of the present invention is small in size (the disk electrode, the insulating layer, and the ring electrode are all in the tens of microns), and has good electrochemical performance. It can be applied not only to the research on detecting intermediates, but also to the field of low-limit detection of biological environments, and has a wide range of application prospects. In the future, its application potential in energy electrochemistry, spectroelectrochemistry, sensors, analytical chemistry and other fields can be fully developed.

[0088] An embodiment of the present invention provides a method for preparing a micron-sized ring-disk electrode composed of different electrode materials, wherein the disk electrode is prepared by stretching the electrode material sealed in a glass capillary into a conical needle tip, and the ring electrode is prepared by directly coating a pre-configured carbon glue to form a solid carbon film; wherein, the preparation of the ring electrode is the key to obtaining a good dual-channel micron-sized ring-disk electrode, which directly affects the test performance of the electrode.

[0089] For the preparation of disk electrodes in micrometer-scale ring-disk electrodes, the present invention proposes a hydrophobic pretreatment of electrode raw materials based on the common preparation method, which effectively solves the problem of electrode preparation failure caused by the easy formation of gaps between the electrode insulating wall and the electrode material.

[0090] For the preparation of the ring electrode in the micron-scale ring-disk electrode, compared with the traditional chemical vapor deposition method and magnetron sputtering method, the preparation method of the ring electrode provided by the present invention has the following advantages: (1) the process is simple and does not involve complicated chemical reactions and physical processes; (2) the cost is low and no expensive equipment and reagents are required; (3) the obtained electrode material has good adhesion, the thickness of the ring electrode material can be controlled to reach tens of microns, the adhesion between the ring electrode material and the insulating layer is strong, and there is no shedding.

[0091] Therefore, the preparation method of the micron-sized ring-disk electrode has a relatively simple process, low cost, and good detection performance; the various equipment involved are relatively simple, various pharmaceutical reagents are relatively cheap, and various operations are relatively simple. The micron-sized ring-disk electrode is composed of two micron-sized electrodes, which show the characteristics of high sensitivity and large signal-to-noise ratio in electrochemical testing. It can be applied to the field of low-limit detection of biological ion environments.

[0092] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode, characterized in that: include: The preselected metal electrode material and non-metal electrode material are sealed into a glass capillary, and the glass capillary is locally heated, stretched, and melted using a stretching instrument to obtain a melted glass capillary; The melted glass capillary is immersed in a hydrophobic solution for hydrophobic pretreatment to obtain a treated glass capillary; a metal wire is introduced from the open end of the treated glass capillary, and the metal wire is connected to the electrode material in the treated glass capillary by using silver paste to form a micron-scale disk electrode; A solid carbon film is formed on the outer wall of a glass capillary of a micrometer-sized disk electrode by using a pre-configured carbon glue; Fixing a metal wire to the end of the solid carbon film to form a micrometer-sized ring electrode; The glass capillary outer tube is sheathed on the outer side of the micrometer-sized ring electrode, which is encapsulated by epoxy resin, and then ground, polished and electrochemically tested to obtain a micrometer-sized ring-disk electrode.

2. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: Pre-selected metal electrode materials, including: Platinum and gold wire.

3. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: Preselected non-metallic electrode materials include: carbon fiber.

4. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: The method includes sealing the preselected metal electrode material and the non-metal electrode material into a glass capillary, and locally heating, stretching, and fusing the glass capillary using a stretching instrument to obtain a fused glass capillary, including: The preselected metal electrode material and the non-metal electrode material are cut to the same length as the glass capillary, and the cut metal electrode material and the non-metal electrode material are cleaned and dried to obtain a treated electrode material; The processed electrode material is sealed in a glass capillary, the position of the glass capillary is calibrated, the glass capillary is placed in the heating center of the tensile tester, and the glass capillary is fixed; The glass capillary is locally heated by using a stretching instrument, and the two ends of the glass capillary are stretched to melt the heated parts of the glass capillary, thereby obtaining a melted glass capillary.

5. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: The method of immersing the melted glass capillary in a hydrophobic solution for hydrophobic pretreatment to obtain the treated glass capillary comprises: Prepare the hydrophobic solution in a glove box with preset environment; Soaking the melted glass capillary in the hydrophobic solution for 30-40 minutes; The soaked glass capillary is taken out and naturally dried in the shade to obtain a treated glass capillary.

6. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: The diameter of the metal wire is smaller than the inner diameter of the glass capillary.

7. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: The method of forming a solid carbon film on the outer wall of a glass capillary of a micron-sized disk electrode by using a pre-configured carbon glue comprises: The pre-configured carbon glue is uniformly coated on the outer wall of the glass capillary of the micron-sized disk electrode by using a brush to form the solid carbon film.

8. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: The pre-configured carbon glue is formed by mixing acetone diluent and carbon glue in a preset ratio.

9. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: The inner diameter of the glass capillary outer tube is greater than the outer diameter of the glass capillary tube.

10. The method for preparing a low-cost, high-collection-rate micrometer-scale ring-disk electrode according to claim 1, characterized in that: The glass capillary outer tube is sheathed on the outer side of the micrometer-sized ring electrode, encapsulated by epoxy resin, and then ground, polished and electrochemically tested to obtain a micrometer-sized ring-disk electrode, including: Sheathing a glass capillary outer tube on the outer side of the micrometer-sized ring electrode and encapsulating it with epoxy resin to obtain an encapsulated electrode; The excess epoxy resin on the surface of the packaged electrode is removed by grinding, and then polished to obtain a polished electrode; The polished electrode is electrochemically tested using a test solution. If the preset requirements are met, a micron-sized ring-disk electrode is obtained. If the preset requirements are not met, grinding, polishing and electrochemical testing are continued until the preset requirements are met to obtain a micron-sized ring-disk electrode.

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