A superstable non-polarizable electrode and preparation method thereof

Abstract

The present application provides an ultra-stable non-polarizable electrode and a preparation method thereof, which relates to the field of geophysical observation instrument development, including an outer shell, a top cover and a bottom shell connected to the upper and lower parts of the outer shell respectively, the top cover is provided with an electrode core and an electrode lead and a metal connector connected to the two, the bottom shell, the outer shell and the top cover form an electrode cavity, the cross section of the electrode cavity is provided with an hourglass-shaped small channel, the electrode cavity is filled with electrolyte slurry, and the electrode core extends into the electrolyte slurry. The electrode cavity is provided with an ion permeable member and other structures that reduce the ion exchange rate, and the outer shell is provided with a sandwich structure filled with insulating material. The ultra-stable non-polarizable electrode has the advantages of small initial range, stable range, low temperature coefficient, long service life and good waterproof performance; at the same time, the present invention uses secondary electrolysis to maintain the electrode, so that the electrode range is restored to the initial state, further improving the service life and cost performance of the electrode.

Description

Technical Field

[0001] The invention relates to the field of geophysical observation instrument development, and in particular to an ultra-stable non-polarizable electrode and a preparation method thereof. Background Art

[0002] Electrical prospecting is an important branch of exploration geophysics, which solves geological and geophysical problems by obtaining electrical information of underground media. Most of the field data collection of electrical prospecting branch methods requires observation of electric field signals. As an important electric field sensor, non-polarized electrodes are used for high-precision measurement of electric field signals. Existing non-polarized electrodes mostly use Pb-PbCl2, Cu-CuSO4, and Ag-AgCl electrodes, which are widely used in electrical prospecting.

[0003] In foreign countries, the Cu-CuSO4 electrode invented by Soviet scientist Semenov in 1937 is the earliest non-polarizable electrode. Although the Cu-CuSO4 electrode can meet the general requirements of electrical prospecting, the consistency of the range is not easy to guarantee, and it is necessary to frequently prepare and fill the liquid, measure the range pairing, and have a short lifespan, making it difficult to apply to long-term observations. In the 1970s, French scientist Gilbert Petiau developed the Pb-PbCl2 electrode for long-term observation problems. Compared with the Cu-CuSO4 electrode, this non-polarizable electrode has excellent characteristics such as small range, low temperature coefficient, low noise, and long stabilization time. In the 1990s, Gilbert Petiau conducted in-depth research on the formulation and structure of the Pb-PbCl2 electrode, which improved the performance of the Pb-PbCl2 electrode. However, Pb-PbCl2 electrodes are harmful to the environment and are not conducive to environmental protection. In Europe, Pb-PbCl2 electrodes have been banned from use in magnetotelluric exploration. In response to the pollution problem of Pb-PbCl2 electrodes, Cu-CuSO4 electrodes are used instead, such as LEMI-701 produced in Ukraine.

[0004] Domestically, in 1997, the Lanzhou Institute of Seismology of the China Earthquake Administration developed the Pb-PbCl2 electrode for magnetotelluric exploration, but its stability could not meet the needs of long-term observations.

[0005] In response to the problems of electrolyte loss inside the electrode and diffusion of soil impurities into the electrode during long-term testing, in order to improve stability, Patent No. CN201410795698.0 improves the electrode structure and adopts a built-in straight tube small channel design to reduce the ion exchange rate and improve the stability of the non-polarized electrode; Patent No. CN202011447602.3 improves the electrode structure and proposes a double-layer electrode structure, which increases the electrolyte capacity inside the electrode, uses small holes to connect the inner and outer layers, and also improves the long-term stability of the electrode.

[0006] However, in actual use, it is found that the above technology has at least the following technical problems:

[0007] The design with built-in straight tube small channels has the problem that the electrolyte of some electrodes is unevenly filled and insufficiently filled in the straight tube small channels, resulting in small bubbles. The small bubbles are easy to migrate to the small channels, causing electrode function failure and affecting electrode stability. The solution with a double-layer electrode structure still has the influence of small bubbles on the extreme difference.

[0008] In response to the problems of poor water retention and short service life of electrolytes, Patent No. CN202011261605.8 proposed a solution to use fumed silica as an electrode filler and a polypropylene diaphragm to divide the electrode into two upper and lower cavities, aiming to improve electrode stability and extend service life. Fumed silica enhances the water retention of the electrolyte, and the polypropylene diaphragm reduces the ion exchange rate. However, in actual use, it was found that the electrode of this solution is a small laboratory electrode, which is difficult to use for field observations, and it also does not solve the impact of temperature changes on electrode measurements.

[0009] Therefore, in the face of the need for long-period geoelectric field observation, higher requirements are put forward for extreme stability. The existing non-polarizable electrodes have the following problems: the external temperature changes affect the electrode measurement accuracy, the electrolyte ion exchange rate is uncontrollable, and it cannot adapt to different test environments; the electrolyte and the external environment have a fast ion exchange rate, which causes impurities in the external environment to diffuse into the electrode electrolyte, shortening the service life of the electrode; when using a straight tube small channel structure electrode for electrolyte filling, there is a problem of uneven and insufficient filling, resulting in small bubbles, affecting the stability of the electrode; the internal electrolyte capacity of the electrode is small and the service life is short; the Pb-PbCl2 electrode also has environmental pollution problems; there is a lack of effective maintenance methods for the electrode. In view of the above problems, there is an urgent need for an ultra-stable non-polarizable electrode for field long-period geoelectric field exploration. Summary of the invention

[0010] In order to overcome the shortcomings of existing non-polarizable electrodes, such as being affected by changes in the temperature of the survey environment during measurement, difficulty in ensuring extreme consistency, and short service life, the embodiments of the present application provide an ultra-stable non-polarizable electrode and a preparation method thereof, which can reduce the exchange rate of ions inside the non-polarizable electrode, reduce the influence of temperature on exploration and measurement, and extend the service life of the electrode, while having the advantages of easy installation and maintainability.

[0011] The technical solution adopted by the embodiment of the present application to solve its technical problem is: an ultra-stable non-polarizable electrode, characterized in that it includes an outer shell, a top cover, and a bottom shell.

[0012] The top cover is provided with an electrode core, an electrode lead and a metal connector connecting the two.

[0013] The bottom shell, the outer shell and the top cover form an electrode cavity, the cross section of the electrode cavity is provided with an hourglass-shaped small channel; the electrode cavity is filled with electrolyte slurry; the electrode core extends into the electrolyte slurry.

[0014] In a specific embodiment, the shell is a sandwich structure formed by an inner layer and an outer layer.

[0015] In a specific embodiment, the inner and outer sandwich structures of the outer shell are filled with thermal insulation material.

[0016] In a specific embodiment, an ion permeable member is provided in the electrode cavity to separate the electrode cavity from top to bottom.

[0017] In a specific embodiment, the ion permeable member disposed in the electrode cavity is a polypropylene diaphragm.

[0018] In a specific embodiment, the bottom shell is a hemispherical tubular porous structure.

[0019] In a specific embodiment, the inner and outer layers of the shell are both made of PVC material, the outer layer of the shell is in a downwardly tapered shape, the electrode core is a silver mesh, and the metal connecting piece is a silver sheet.

[0020] In a specific embodiment, the method for preparing the ultrastable non-polarizable electrode comprises:

[0021] Step 1: Material preparation: Process the shell of the ultra-stable non-polarizable electrode, make the hourglass-shaped small channel of the shell, the hemispherical porous bottom shell and the polypropylene diaphragm, and clean the silver sheet in the top cover;

[0022] Step 2: preparing electrolyte slurry;

[0023] Step 3: Test the pH value. If the pH value is unqualified, calibrate the pH value of the electrolyte slurry. If the pH value is qualified, proceed to the next step.

[0024] Step 4: Filling: injecting electrolyte slurry into the electrode cavity of the non-polarizable electrode;

[0025] Step 5: Test extremely poorly and put it into use.

[0026] In a specific embodiment, the preparation of the electrolyte slurry of the ultrastable non-polarizable electrode comprises:

[0027] Step A, preparing a PAAAM super absorbent resin / silicon dioxide composite water-retaining material, taking acrylic acid and adding sodium hydroxide solution to neutralize it in an ice bath, then adding acrylamide and N,N-methylenebisacrylamide in sequence and stirring until completely dissolved, then adding nano-silicon dioxide to the solution and mechanically stirring it, then putting it into an ultrasonic instrument for ultrasonication, shaking it violently from time to time during the ultrasonication process, and cooling the mixed mud after the ultrasonication;

[0028] Step B, then adding glycerol, potassium persulfate and sodium sulfite to the solution in sequence, and stirring continuously, and obtaining a resin gel colloid liquid after the reaction is terminated;

[0029] Step C, mixing AgCl, HCl, NaCl and water, and stirring by electromagnetic stirring until a mixed solution is obtained;

[0030] Step D: Mix the resin gel colloid obtained in step 2 with the mixed solution obtained in step 3 and stir them together with electromagnetic stirring until they are uniform. The uniform colloid finally obtained is the electrolyte slurry.

[0031] In a specific embodiment, the ultrastable non-polarizable electrode maintenance method comprises the following steps:

[0032] Step a, immersing a non-polarizable electrode and a pure silver sheet in an electrolyte, connecting the non-polarizable electrode and the pure silver sheet to a power source, connecting the non-polarizable electrode to a positive potential and electrifying it as an anode, and connecting the pure silver sheet to a negative potential and electrifying it, removing impurities on the surface of the silver sheet of the non-polarizable electrode, and leaving a pure silver sheet at the exposed part;

[0033] Step b: Use the non-polarizable electrode as the cathode, connect it to the negative potential of the power supply, connect the pure silver sheet to the positive potential of the power supply and energize it, and plate a layer of silver chloride film on the non-polarizable electrode silver sheet; the whole process needs to be operated in the dark.

[0034] The advantages of the embodiments of the present application are:

[0035] 1. The hourglass-shaped small channel structure set in the cross section of the non-polarized electrode cavity effectively reduces the ion exchange rate, while avoiding the situation where the electrolyte is filled unevenly and insufficiently in the small channel to produce small bubbles, thereby improving the extreme stability of the non-polarized electrode.

[0036] 2. The shell of the non-polarized electrode adopts a sandwich structure, which effectively reduces the impact of temperature on exploration and measurement and improves the extreme stability of the non-polarized electrode.

[0037] 3. An ion permeable member is provided in the electrode cavity of the non-polarizable electrode, which can further reduce the ion exchange rate and extend the service life of the electrode.

[0038] 4. The bottom shell of the non-polarizable electrode adopts a hemispherical tubular porous structure, which can make the ion exchange more uniform, improve the sensitivity of exploration, and adapt to different exploration and testing environments.

[0039] 5. The electrolyte slurry is prepared by combining AgCl powder with PAAAM super absorbent resin / silicon dioxide composite water-retaining material, which makes the water-retaining capacity stronger and the extreme stability better, and can be competent for the exploration of long-period earth electric fields.

[0040] 6. The cost performance of the electrode is improved and the service life of the electrode is extended by performing secondary electrolysis maintenance on the silver sheet connected to the electrode core and the electrode lead in the top cover of the non-polarized electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of an ultrastable non-polarizable electrode of the present invention;

[0042] Figure 2 A bottom view of a bottom shell of an ultrastable non-polarizable electrode of the present invention;

[0043] Figure 3 A manufacturing flow chart of an ultrastable non-polarizable electrode of the present invention;

[0044] Figure 4 The present invention is a schematic diagram of the maintenance of a silver sheet installed inside the top cover of an ultra-stable non-polarizable electrode.

[0045] Description of main reference numerals:

[0046] 1-electrolyte slurry; 2-bottom shell; 3-hourglass-shaped small channel; 4-insulating material; 5-ion permeable member; 6-electrode core; 7-fixing ring; 8-outer shell; 9-top cover; 10-electrode lead; 11-metal connector; 12-electrode cavity; 13-power supply; 14-pure silver sheet; 15-non-polarizable electrode; 16 electrolyte. DETAILED DESCRIPTION

[0047] The present application provides an ultra-stable non-polarizable electrode and a preparation method thereof to solve the problems of the non-polarizable electrode in the prior art, such as its extreme instability, short service life, and susceptibility to external temperature. The overall idea is as follows:

[0048] Embodiment 1:

[0049] See also Figure 1The present invention provides an ultrastable non-polarizable electrode, comprising an outer shell 8, a top cover 9 and a bottom shell 2 respectively connected to the upper and lower parts of the outer shell 8, the top cover 9 is provided with an electrode core 6 and an electrode lead 10 and a metal connector 11 connecting the two; the bottom shell 2 and the inner layer of the outer shell 8 and the top cover form an electrode cavity 12, the cross section of the electrode cavity 12 is provided with an hourglass-shaped small channel 3, the electrode cavity 12 is filled with an electrolyte slurry 1, and the electrode core 6 extends into the electrolyte slurry 1.

[0050] When in use, the bottom of the non-polarizable electrode is buried downward in the geological soil to be measured, and the electrode lead 10 is connected to the measuring instrument, so that the electrolyte slurry 1 in the inner cavity of the non-polarizable electrode is connected to the earth to be measured through the bottom shell 2, thereby generating a charge conductive channel between the earth to be measured, the electrolyte slurry 1, the electrode core 6, the metal connector 11, the electrode lead 10, and the measuring instrument to form a ground measurement circuit to achieve the measurement of the ground potential signal. Since the bottom of the non-polarizable electrode is in contact with the earth to be measured through the bottom shell 2, the polarization potential generated by the direct contact between the metal electrode and the earth is avoided, and the non-polarizable electrode is filled with uniform electrolyte slurry 1, which can keep the internal potential of the electrode stable for a long time, thereby improving the measurement accuracy of the ground potential.

[0051] Since the production of traditional non-polarizable electrodes usually involves inserting a metal wire into an electrode shell filled with a saturated metal salt solution and contacting the soil through the bottom, the electrolyte ion concentration changes locally too much after a period of use, and the change in electrolyte ion concentration will cause electrochemical changes at the metal electrode / electrolyte interface, generating polarization potential and affecting the measurement accuracy. In this embodiment, a metal-metal salt solution electrode is used, and an electrolyte slurry 1 composed of a metal salt maintaining a certain pH is set between the soil and the metal electrode in an ion-conductive electrochemical manner. By improving the structure of the electrode and controlling the metal salt ion concentration in the electrode cavity 12, the metal polarization potential is reduced and kept relatively stable.

[0052] In this embodiment, an hourglass-shaped small channel 3 is provided in the cross section of the electrode cavity 12. When ions are exchanged up and down in the electrode cavity 12, the speed of ion movement is restricted due to the existence of the hourglass-shaped small channel 3, and the exchange speed is reduced. During the use of the electrode buried in the earth, when external ions in the earth enter the electrolyte slurry 1 through the electrode bottom shell 2, the influence of the change of ion concentration in the electrode cavity 12 above the hourglass-shaped small channel 3 will be reduced as much as possible, so that the ion concentration in the upper part of the electrode cavity 12 can be better maintained constant, thereby ensuring the stability of the electrochemical reaction in the electrode / electrolyte interface; in addition, the structural design of the hourglass-shaped small channel 3 is different from that of the traditional straight tube small channel. When the electrolyte slurry 1 is poured, the bubbles can be discharged upward along the inner side of the hourglass, avoiding the situation where small bubbles are easily generated during filling, thereby ensuring the electrode stability and measurement accuracy.

[0053] The top cover 9 adopts a watertight connector structure, and a metal connector 11 connected to the electrode core 6 and the electrode lead 10 is provided inside the top cover 9. In this example, the metal connector 11 is a silver sheet, the electrode core 6 is a silver mesh, and the fixing ring 7 fixes the silver sheet and the silver mesh to prevent the silver mesh from moving inside the electrode and causing electrode noise, which brings unstable factors to the measurement. The lead-out silver sheet is combined with the watertight connector through a hard connection in a high-voltage manner, and the electrode lead 10 that passes through the outside is a copper wire.

[0054] like Figure 2 As shown, the bottom shell 2 of the non-polarizable electrode adopts a hemispherical tubular porous structure made of PVC material, and the number of openings can be specifically set according to different geological environments, so as to adapt to different geological observation environments. The electrode is connected to the external measurement environment through the bottom shell 2, so that the electrolyte slurry 1 and external ions diffuse through the bottom shell 2. Different from the traditional planar contact structure between the bottom of the electrode and the earth, the hemispherical contact structure increases the contact area, makes the ion exchange more uniform, and the electrolyte exchange current density is more uniform. In addition, the number of openings can be specifically determined according to different geological environments, so as to adjust the diffusion speed of the ions between the earth and the electrode cavity 12, and keep the ion concentration in the electrode cavity 12 as stable as possible, thereby improving the exploration sensitivity and the service life of the electrode.

[0055] In this example, the electrolyte slurry 1 is prepared by combining AgCl powder with PAAAM super absorbent resin / silicon dioxide composite water-retaining material. The electrolyte slurry 1 has stronger water-retaining capacity and better extreme stability, and is capable of performing long-period geoelectric field exploration tasks.

[0056] Embodiment 2:

[0057] The difference from Example 1 is that an ion permeable member 5 is provided in the electrode cavity 12 to separate the upper and lower electrodes. In this example, the ion permeable member 5 is a polypropylene diaphragm. When ions are exchanged between the separated upper and lower electrode cavities 12, the characteristics of the microporous structure of the polypropylene diaphragm limit the passage of ions. In this way, the ion exchange rate will be reduced, and the ion concentration in the electrode cavity 12 above the polypropylene diaphragm will remain relatively constant, avoiding being directly affected by the changes in the ion concentration in the lower cavity, thereby ensuring the stability of the electrochemical reaction in the silver mesh / electrolyte slurry interface in the upper cavity of the electrode. The hourglass-shaped small channel 3 and the polypropylene diaphragm are set at the same time, which further reduces the ion exchange rate in the electrode cavity 12, better maintains the ion concentration in the upper part of the electrode cavity 12, and improves the stability of the extreme difference.

[0058] Embodiment 3:

[0059] The difference from Example 1 and Example 2 is that:

[0060] The inner and outer sandwich structures of the shell 8 are filled with insulating material 4. In this example, the shell 8 preferably adopts a three-layer structure, the outermost and innermost layers are PVC materials, and the middle layer insulating material 4 is nano-scale silicon dioxide. The electrochemical reaction in the electrode / electrolyte interface is related to the ambient temperature, and the temperature also affects the ion exchange rate of the electrolyte. In this embodiment, a sandwich structure shell 8 with an insulating function is used. During specific use, the ion movement exchange in the electrolyte slurry 1 can work better at a relatively stable ambient temperature, and will not cause changes in the ion activity of the electrolyte slurry 1 due to drastic changes in the external temperature during the data acquisition process, thereby reducing the impact of changes in ion activity on the electrode / electrolyte interface on the electrode measurement accuracy. In addition, the outer layer of the shell 8 in this embodiment is designed to be a downward-retracted cone, which is convenient for installation in field operations.

[0061] See also Figure 3 The present invention provides a method for preparing an ultrastable non-polarizable electrode, comprising:

[0062] Step 1, material preparation: processing the shell 8 of the ultra-stable non-polarizable electrode, and making the hourglass-shaped small channel 3, the hemispherical porous bottom shell 2 and the polypropylene diaphragm of the shell 8, and cleaning the silver sheet in the top cover 9;

[0063] Step 2: preparing electrolyte slurry 1;

[0064] Step 3: Test the pH value. If the pH value is unqualified, calibrate the pH value of the electrolyte slurry 1. If the pH value is qualified, proceed to the next step.

[0065] Step 4: filling: injecting the electrolyte slurry 1 into the electrode cavity 12 of the non-polarizable electrode;

[0066] Step 5: Test the range and put it into use. After the electrode is sealed, the electrode is tested for linearity, background noise, range stability, source impedance, frequency characteristics and temperature coefficient; electrodes that fail the test are discarded, and electrodes that pass the test are put into use.

[0067] The present invention also provides a method for preparing an electrolyte slurry 1 for an ultrastable non-polarizable electrode, comprising:

[0068] Step A, preparing a PAAAM super absorbent resin / silicon dioxide composite water-retaining material, taking acrylic acid and adding sodium hydroxide solution to neutralize it in an ice bath, then adding acrylamide and N,N-methylenebisacrylamide in sequence and stirring until completely dissolved, then adding nano-silicon dioxide to the solution and mechanically stirring it, then putting it into an ultrasonic instrument for ultrasonication, shaking it violently from time to time during the ultrasonication process, and cooling the mixed mud after the ultrasonication;

[0069] Step B, then adding glycerol, potassium persulfate and sodium sulfite to the solution in sequence, and stirring continuously, and obtaining a resin gel colloid liquid after the reaction is terminated;

[0070] Step C, mixing AgCl, HCl, NaCl and water, and stirring by electromagnetic stirring until a mixed solution is obtained;

[0071] Step D: Mix the resin gel colloid obtained in step 2 with the mixed solution obtained in step 3 and stir them together with electromagnetic stirring until they are uniform. The uniform colloid finally obtained is the electrolyte slurry 1.

[0072] According to a method for preparing an electrolyte slurry 1 for an ultra-stable non-polarizable electrode provided by the present invention, preferably, in step A, the concentration of the sodium hydroxide solution is 10%, the neutralization degree of acrylic acid added to the sodium hydroxide solution is 75%, 2% of nano-silicon dioxide is added and mechanical stirring is performed for 1 hour, and then the mixture is placed in an ultrasonic instrument at a temperature of 60 degrees for 1 hour, and the mixture is shaken violently from time to time during the ultrasonic process. After the ultrasonication, the mixed slurry is cooled to room temperature; in step B, the reaction temperature of glycerol, potassium persulfate and sodium sulfite is maintained at 35°C, and the reaction is terminated after 30 minutes. When synthesizing the water-retaining material, acrylic acid and The mass ratio of acrylamide is 10:1, potassium persulfate and sodium sulfite are selected as initiators, N,N-methylenebisacrylamide is selected as a crosslinking agent, and propylene glycol is selected as a plasticizer, and the amounts thereof are 1%, 0.04% and 0.15% of the monomer mass, respectively; in step C, 40g of AgCl, 0.2g of HCl, 1.1kg of NaCl and 1L of water are mixed, wherein the electromagnetic stirring speed is 10-100r / min, and the stirring time is 0.5-2h; in step D, the electromagnetic stirring speed is 10-100r / min, and the stirring time is 24-48h.

[0073] See also Figure 4 The present invention also provides a method for maintaining an ultra-stable non-polarizable electrode, comprising:

[0074] Step a, immersing the non-polarizable electrode 15 and the pure silver sheet 14 in an electrolyte, connecting the non-polarizable electrode 15 and the pure silver sheet 14 to a power source 13, connecting the non-polarizable electrode to a positive potential and electrifying it as an anode, and connecting the pure silver sheet 14 to a negative potential and electrifying it, removing impurities on the surface of the silver sheet of the non-polarizable electrode 15, and leaving a pure silver sheet at the exposed part;

[0075] Step b: Use the non-polarizable electrode 15 as a cathode, connect it to the negative potential of the power supply 13, connect the pure silver sheet 14 to the positive potential of the power supply 13 and energize it, and plate a layer of silver chloride film on the silver sheet of the non-polarizable electrode 15; the whole process needs to be operated in the dark.

[0076] Preferably, the electrolyte 16 in step a is a 3.5% NaCl solution.

[0077] In summary, the present invention reduces the ion exchange rate while avoiding the generation of bubbles in the small channel by providing an hourglass-shaped small channel 3 in the electrode cavity, designs the outer shell 8 as a sandwich structure, fills it with insulating material 4, and reduces the influence of temperature on exploration and measurement; by providing a structure for reducing the ion exchange rate in the electrode cavity 12, an ion permeable member 5 made of a polypropylene diaphragm, etc., reduces the exchange rate of ions inside the non-polarized electrode and extends the service life of the electrode; the bottom shell 2 is designed as a hemispherical tubular porous structure with an adjustable number of openings, so that the ion exchange is more uniform and adapts to different geographical exploration environments; the outer layer of the non-polarized electrode outer shell 8 is designed as a downwardly inward-retracted cone, which is convenient for field operation and installation; the preparation method of an electrolyte slurry 1 proposed in the present invention has stronger water retention capacity and better extreme stability, and can be competent for the exploration task of long-period earth electric field; the non-polarized electrode maintenance method proposed in the present invention improves the cost-effectiveness of electrode use.

[0078] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. An ultrastable non-polarizable electrode, characterized in that: include: shell; A top cover, on which are arranged an electrode core and an electrode lead and a metal connector connecting the two; The bottom shell, the outer shell and the top cover form an electrode cavity, the cross section of the electrode cavity is provided with an hourglass-shaped small channel; the electrode cavity is filled with electrolyte slurry; the electrode core extends into the electrolyte slurry; Among them, the outer shell is a sandwich structure formed by inner and outer layers; the inner and outer sandwich structures of the outer shell are filled with insulating materials; the inner and outer layers of the outer shell are both made of PVC material, the outer layer of the outer shell is a downwardly conical shape, the electrode core is a silver mesh, and the metal connecting piece is a silver sheet.

2. An ultrastable non-polarizable electrode as claimed in claim 1, characterized in that: An ion permeable member is arranged in the electrode cavity to separate the electrode cavity from top to bottom.

3. An ultrastable non-polarizable electrode as claimed in claim 2, characterized in that: The ion permeable member arranged in the electrode cavity is a polypropylene diaphragm.

4. The ultrastable non-polarizable electrode according to claim 1, characterized in that: The bottom shell is a hemispherical tubular porous structure.

5. A method for preparing an ultrastable non-polarizable electrode as claimed in claim 1, characterized in that: include: Step 1: Material preparation: Process the shell of the ultra-stable non-polarizable electrode, make the hourglass-shaped small channel of the shell, the hemispherical porous bottom shell and the polypropylene diaphragm, and clean the silver sheet in the top cover; Step 2: preparing electrolyte slurry; Step 3: Test the pH value. If the pH value is unqualified, calibrate the pH value of the electrolyte slurry. If the pH value is qualified, proceed to the next step. Step 4: Filling: injecting electrolyte slurry into the electrode cavity of the non-polarizable electrode; Step 5: Test the extremes and put it into use.

6. The method for preparing an ultrastable non-polarizable electrode according to claim 5, characterized in that: The specific steps of preparing the electrolyte slurry include: Step A, preparing a PAAAM super absorbent resin / silicon dioxide composite water-retaining material, taking acrylic acid and adding sodium hydroxide solution to neutralize it in an ice bath, then adding acrylamide and N,N-methylenebisacrylamide in sequence and stirring until completely dissolved, then adding nano-silicon dioxide to the solution and mechanically stirring it, then putting it into an ultrasonic instrument for ultrasonication, shaking it violently from time to time during the ultrasonication process, and cooling the mixed mud after the ultrasonication; Step B, then adding glycerol, potassium persulfate and sodium sulfite to the solution in sequence, and stirring continuously, and obtaining a resin gel colloid liquid after the reaction is terminated; Step C, mixing AgCl, HCl, NaCl and water, and stirring by electromagnetic stirring until a mixed solution is obtained; Step D: Mix the resin gel colloid obtained in step 2 with the mixed solution obtained in step 3 and stir them together with electromagnetic stirring until they are uniform. The uniform colloid finally obtained is the electrolyte slurry.

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