An online detection method and device for the distribution of electrolytic water electrode reaction activity

Abstract

The present invention discloses an online detection method and device for the distribution of the reaction activity of water electrolysis electrodes, which characterizes the size of the reaction activity of the electrodes by the starting potential, that is, characterizes the distribution of the reaction activity of water electrolysis electrodes by the starting potential distribution on the surface of water electrolysis electrodes; the online detection method for the distribution of the starting potential distribution on the surface of water electrolysis electrodes comprises the following steps: using a prism-type total reflection system with incident parallel light to perform real-time imaging on the surface of water electrolysis electrodes; simultaneously using a potential scanning device module to perform potential scanning on the water electrolysis electrodes; and obtaining the starting potential distribution on the surface of water electrolysis electrodes according to the change of light intensity at different positions in the image with the potential. The device comprises an incident parallel light module, a TIR module, and an imaging detection module arranged in sequence. The present invention provides a tool for imaging the electrode surface and real-time detection of the activity distribution at the local position of the electrode for reactions such as water electrolysis hydrogen evolution reaction that do not require a metal film layer.

Description

Technical Field

[0001] The invention belongs to the technical field of imaging measurement, and in particular relates to an online detection method and device for the distribution of electrode reaction activity of electrolyzed water. Background Art

[0002] As the energy crisis becomes increasingly prominent, the development of sustainable green energy has become the focus of people's attention. Hydrogen energy is a green, reliable and sustainable energy. On the one hand, hydrogen can be prepared online through electrolysis cells and transported through natural gas pipelines, making it possible to replace traditional fossil fuels. On the other hand, the only product of hydrogen combustion is water, which is a completely clean energy source. Fuel cells can directly convert the chemical energy of hydrogen into electrical energy for human use. At present, the methods for preparing hydrogen generally include fossil fuel hydrogen production, industrial byproduct hydrogen production and water electrolysis hydrogen production. The first two methods have the defects of insufficient hydrogen purity (mixed with carbon-containing substances such as carbon monoxide), and cannot reduce dependence on traditional fossil fuels or reduce pollutant emissions. Therefore, the promising technology of preparing hydrogen by electrolysis of water has attracted widespread attention from scientists.

[0003] Due to the high energy barrier caused by the reaction, the hydrogen evolution reaction (HER) process is slow, so it is necessary to add efficient, stable and economical HER catalysts, such as Pt. However, most of these catalysts are precious metals and are extremely expensive, so it is of great significance to rationally optimize the loading amount of the catalyst. The traditional electrical methods for characterizing electrode activity mainly include potential scanning method (linear sweep voltammetry (LSV), cyclic voltammetry (CV)), constant current charge and discharge method and electrochemical impedance spectroscopy. Such methods can only give the overall reaction activity of the electrode. For example, cyclic voltammetry can only collect the average current density change of the electrode after voltage is applied, that is, it is impossible to characterize the difference in activity at different positions of the modified electrode.

[0004] Existing patent CN109724947A discloses an optical detection method based on surface plasmon resonance (SPR) technology to detect the refractive index of the electrolyte near the vanadium electrolyte electrode, and then obtain the local current density of the electrode, and then reflect the distribution of activity at different positions of the electrode in the electrode reaction by the change of the refractive index of the local electrolyte of the electrode over time (publication number). This technology adopts Kretschmann structure, and the film structure includes the metal film structure of SPR, the medium-metal film structure of long-range SPR (LRSPR) and the metal-medium film structure of waveguide type SPR (PWR). The metal film layer is easy to fall off in a strong acid environment. Compared with SPR technology, the advantage of TIR (Total internal reflection) technology is that it does not require a metal film layer. In this way, there will be no problem of metal film layer falling off in a highly corrosive solution environment. In addition, due to the absence of a metal film layer, the background current interference during the test will be reduced accordingly.

[0005] However, a large number of bubbles will be generated on the surface of the prism and the electrode during the electrolysis of water, which will cause a large change in the refractive index of the electrolyte (such as sulfuric acid solution). For example, the refractive index from the liquid phase to the gas phase drops from about 1.338 to about 1. However, the refractive index detection range of refractive index measurement technologies such as SPR and TIR is about 0.001 to 0.01, and it is impossible to measure the refractive index change from the water phase to the gas phase. It is difficult to perform online in-situ detection of electrolysis of water to obtain the distribution of the electrolysis water electrode reaction activity. Therefore, how to perform online detection of the distribution of the electrolysis water electrode reaction activity is a difficult problem. Summary of the invention

[0006] In order to solve the technical problems raised in the above background technology, the purpose of the present invention is to provide an online detection method and device for the distribution of electrode reaction activity of electrolyzed water.

[0007] In order to achieve the above-mentioned object, the technical scheme adopted by the present invention is as follows: on the one hand, the present invention provides an online detection method for the distribution of the reaction activity of the water electrolysis electrode, which characterizes the reaction activity of the electrode by the starting potential, that is, characterizes the distribution of the reaction activity of the water electrolysis electrode by the starting potential distribution on the surface of the water electrolysis electrode;

[0008] The online detection method of the initial potential distribution on the surface of the water electrolysis electrode comprises the following steps:

[0009] (1) using a prism-type total reflection system with parallel light incident on the surface of the water electrolysis electrode to perform real-time imaging; while the prism-type total reflection system with parallel light incident on the surface of the water electrolysis electrode performs real-time imaging on the surface of the water electrolysis electrode, a potential scanning device module is used to perform potential scanning on the water electrolysis electrode;

[0010] (2) According to the change of light intensity (potential) over time at different positions in the image, the distribution of the initial potential on the surface of the water electrolysis electrode is obtained, where the initial potential is the potential when the light intensity just starts to change.

[0011] Furthermore, the online detection method of the initial potential distribution on the surface of the water electrolysis electrode specifically comprises the following steps:

[0012] (1) adjusting the prism-type total reflection system with parallel light incident to a state where the surface of the water electrolysis electrode can be clearly imaged, and recording a two-dimensional image of the water electrolysis electrode;

[0013] (2) using a potential scanning device module to perform potential scanning on the water electrolysis electrode;

[0014] (3) using a prism-type total reflection system with parallel light incidence to collect and save the real-time changes of the two-dimensional image of the water electrolysis electrode during the potential scanning process;

[0015] (4) The curve of the change of light intensity over time (potential) at different positions of the image is plotted by using the collected two-dimensional image group to obtain the initial potential distribution on the surface of the water electrolysis electrode, where the initial potential is the potential when the light intensity just starts to change.

[0016] Furthermore, the parallel light incident prism type total reflection system comprises an incident parallel light module, a TIR module, and an imaging detection module which are arranged in sequence.

[0017] Further, the incident parallel light module is used to provide parallel incident light;

[0018] The TIR module detects the change of refractive index by total reflection of parallel incident light at the contact surface between the TIR module and the water electrolysis electrode. The change of refractive index in the hydrogen evolution reaction is mainly due to the generation of bubbles.

[0019] The imaging detection module is used to collect the reflected light imaging of the water electrolysis electrode to obtain position information, and is used to detect the light intensity change in real time, and then obtain the starting potential when the refractive index changes at various locations on the surface of the water electrolysis electrode based on the relationship between light intensity and refractive index.

[0020] Furthermore, the potential scanning device module causes the hydrogen evolution reaction to generate bubbles through potential scanning to produce a change in the refractive index of the surface of the water electrolysis electrode.

[0021] On the other hand, the present invention provides an online detection device for the distribution of the reaction activity of the water electrolysis electrode, comprising a prism-type total reflection system for incident parallel light, wherein the prism-type total reflection system for incident parallel light comprises an incident parallel light module, a TIR module, and an imaging detection module arranged in sequence;

[0022] The incident parallel light module is used to provide parallel incident light;

[0023] The TIR module detects the change in refractive index by total reflection of parallel incident light at the contact surface between the TIR module and the water electrolysis electrode;

[0024] The imaging detection module is used, on the one hand, to collect the reflected light imaging of the water electrolysis electrode to obtain position information, and on the other hand, to detect the light intensity change in real time, and then obtain the starting potential when the refractive index changes at various locations on the surface of the water electrolysis electrode based on the relationship between light intensity and refractive index. The reaction activity of the electrode is characterized by the starting potential, that is, the reaction activity distribution of the water electrolysis electrode is characterized by the starting potential distribution on the surface of the water electrolysis electrode.

[0025] Furthermore, the incident parallel light module includes a point light source and a collimating lens which are arranged in sequence;

[0026] Preferably, the TIR module comprises a prism, and the prism is in direct contact with the water electrolysis electrode;

[0027] Preferably, the imaging detection module comprises an imaging lens group and an area array camera which are arranged in sequence; more preferably, the imaging detection module further comprises a filter, and the filter is located between the TIR module and the imaging lens group.

[0028] Furthermore, it also includes a potential scanning device module, which performs potential scanning on the water electrolysis electrode to promote the hydrogen evolution reaction to generate bubbles, so that the refractive index of the electrolyte at the water electrolysis electrode changes, thereby changing the intensity of the TIR reflected light;

[0029] Preferably, the potential scanning device module performs potential scanning on the water electrolysis electrode through an electrochemical workstation to induce hydrogen evolution reaction to generate bubbles to produce a change in the refractive index of the water electrolysis electrode surface.

[0030] Furthermore, the water electrolysis electrode is a water electrolysis electrode that can be attached to a TIR module.

[0031] Furthermore, it also includes a vacuum sealing device, in which the TIR module and the water electrolysis electrode are located, and the vacuum sealing device is used to discharge bubbles generated after the detection is completed, so that the electrolyte refills the gap between the TIR module and the water electrolysis electrode, so that the next test can be carried out without removing the sample;

[0032] Preferably, the vacuum sealing device comprises a sealing cover, a vacuum device, a window for incident light and a window for outgoing light.

[0033] The beneficial effects of the present invention are as follows: the applicant has found that before a large number of macroscopic bubbles are generated, there will be a process of generating microbubbles, during which the refractive index of the prism surface will undergo a slight change, which can be measured by TIR technology during this process, and the corresponding potential at this time is the starting potential. Since the generation of a large number of macroscopic bubbles will prevent the reaction from proceeding, the present application characterizes the size of the electrode's reaction activity by using the starting potential generated by microbubbles, thereby avoiding the influence of the generation of macroscopic bubbles on the measurement, and thus the measurement is more accurate. The present invention provides a tool for imaging the electrode surface and real-time detection of the activity distribution of the local position of the electrode for reactions such as the electrolysis of water and hydrogen evolution reaction that do not require a metal film layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a module diagram of an online detection device for the distribution of the initial potential on the surface of the water electrolysis electrode in an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the structure of an online detection device for the distribution of the initial potential on the surface of an electrolyzed water electrode in an embodiment of the present invention;

[0036] Figure 3 is a graph showing the relationship between the ratio of the reflected light intensity to the light source intensity and the incident angle in a 0.5M H2SO4 solution in an embodiment of the present invention;

[0037] Figure 4 is a curve diagram showing the relationship between the ratio of the reflected light intensity to the incident light intensity and the refractive index of the solution at an incident angle of 49.8° in an embodiment of the present invention;

[0038] Figure 5 a is the LSV curve obtained by scanning at 1mV / s in the electrochemical workstation. Figure 5 b is the TIR imaging diagram when the voltage is 0V, Figure 5 c is the relationship curve between the light intensity change and the scanning voltage corresponding to the three points A, B, and C in Figure b. Figure 5 d is the initial potential distribution diagram of the electrode;

[0039] Figure 6 This is a TIR imaging diagram when the scanning voltage is -0.95V in an embodiment of the present invention;

[0040] Among them, 1. Incident parallel light module, 11. Point light source, 12. Collimating lens, 2. TIR module, 21. Prism, 3. Imaging detection module, 31. Filter, 32. Imaging lens group, 33. Area array camera, 34. Electrode imaging schematic diagram, 4. Potential scanning device module, 41. Electrochemical workstation, 42. Water electrolysis electrode, 43. Electrolytic cell, 51. Sealing cover, 52. Vacuum extraction device, 53. Incident light window, 54. Outgoing light window. DETAILED DESCRIPTION

[0041] The method for characterizing the performance of the water electrolysis electrode in the embodiment of the present invention is based on a three-electrode system combined with traditional electrical methods (linear sweep voltammetry) and TIR technology for imaging and real-time detection, so as to achieve the measurement of the activity distribution of different positions of the water electrolysis electrode. When the electrolyte at the electrode undergoes a hydrogen evolution reaction, the hydrogen ions in the electrolyte at the electrode generate hydrogen as the potential is scanned to the starting potential in the linear sweep voltammetry, and hydrogen is precipitated when the solubility of hydrogen near the electrode reaches saturation, so that the refractive index changes, which can be measured by the intensity of the reflected light. Therefore, the bubble generation situation can be reversed by measuring the change in the intensity of the reflected light in a scanning cycle, and the local electrode activity can be obtained. Compared with the linear sweep voltammetry method to directly obtain the average current density of the entire electrode, the TIR imaging technology can characterize the distribution of the starting potential at different positions of the electrode, which realizes the quantitative characterization of the activity at different positions of the electrode.

[0042] The present invention is further described below in conjunction with the accompanying drawings and a preferred specific implementation manner.

[0043] The module diagram of the online detection device for the distribution of the electrolytic water electrode reaction activity used in the embodiment of the present application is as follows: Figure 1 As shown, it includes an incident parallel light module 1, a TIR module 2, an imaging detection module 3, and a potential scanning device module 4. The incident parallel light module 1 generates parallel incident light. The TIR module 2 mainly detects the change in refractive index by total reflection of the parallel incident light at the contact surface between the TIR module and the water electrolysis electrode, and the change in refractive index in the hydrogen evolution reaction is mainly due to the generation of bubbles. On the one hand, the imaging detection module 3 collects the reflected light imaging of the water electrolysis electrode to obtain position information, and on the other hand, it detects the change in light intensity in real time, and then obtains the starting potential when the refractive index changes at various locations on the electrode surface according to the relationship between light intensity and refractive index. The potential scanning device module 4 performs a potential scan on the water electrolysis electrode, and on the one hand, obtains the voltage and current density change curve of the electrode as a whole, and on the other hand, promotes the generation of bubbles in the hydrogen evolution reaction through potential scanning to produce a change in the refractive index on the surface of the water electrolysis electrode, thereby causing the TIR reflected light intensity to change;

[0044] The structural schematic diagram of the online detection device for the distribution of the electrolytic water electrode reaction activity is as follows: Figure 2As shown, the incident parallel light module 1 includes a point light source 11 and a collimating lens 12 arranged in sequence, and parallel incident light is obtained, and is incident on the TIR module 2 at an angle close to the total reflection angle (i.e., the angle corresponding to the highest sensitivity of the light intensity type TIR); the TIR module 2 includes a prism 21 with a refractive index of 1.75, and the prism 21 is in direct contact with the water electrolysis electrode 42. The parallel incident light directly hits the surface of the prism 21 and the water electrolysis electrode 42 for total reflection, and bubbles are generated at the contact interface; the imaging detection module 3 includes a filter 31, an imaging lens group 32 and an array camera 33 arranged in sequence. In order to maintain the monochromaticity of the light, no interference fringes appear, and higher precision, the interface reflected light needs to pass through the narrow-band filter 31, and then pass through the imaging lens group 32 to be received by the array camera 33; since the hydrogen evolution reaction water electrolysis electrode 42 is in close contact with the prism 21, the imaging lens group 32 can image the surface of the water electrolysis electrode 42. The schematic diagram of electrode imaging is shown in Figure 2 As shown in 34. The imaging contrast mainly comes from the refractive index difference caused by the contact and non-contact between the water electrolysis electrode 42 and the prism 21. A three-electrode system is adopted, and the electrolytic cell 43 includes an electrolyte and a water electrolysis electrode 42. The potential scanning device module 4 performs a potential scanning on the carbon felt (water electrolysis electrode 42) loaded with a catalyst on the working electrode through the electrochemical workstation 41 to promote the hydrogen evolution reaction to generate bubbles; the potential scanning device module 4 performs a potential scanning on the water electrolysis electrode 42 to change the refractive index of the electrolyte (0.5M H2SO4 solution) at the water electrolysis electrode 42, which causes the TIR reflected light intensity to change and also causes the two-dimensional imaging image to evolve, which provides the possibility of non-contact non-destructive detection of electrode activity and study of activity differences at different positions of the electrode by optical TIR method. In addition, it also includes a vacuum sealing device, which includes a sealing cover 51, a vacuum device 52, a window for incident light 53 and a window for outgoing light 54. The settings of the window for incident light 53 and the window for outgoing light 54 ensure that the incident light path and the outgoing light path are not affected; the TIR module 2 and the water electrolysis electrode 42 are located in the vacuum sealing device, and the vacuum sealing device is used to discharge the bubbles generated after the detection is completed, so that the electrolyte refills the gap between the TIR module 2 and the water electrolysis electrode 42, so that the next test can be carried out without removing the sample.

[0045] The method for online detection of the distribution of the activity of the electrolytic water electrode reaction using an online detection device for the distribution of the activity of the electrolytic water electrode reaction comprises the following steps: (1) adjusting the prism-type total reflection system for incident parallel light to a state where the surface of the working electrode (carbon felt loaded with catalyst) can be clearly imaged, and recording a two-dimensional image of the working electrode (carbon felt loaded with catalyst);

[0046] (2) performing a scanning test on the three-electrode system using the linear scanning voltammetry method of the potential scanning device module 4 to obtain an overall average voltage-current density curve of the electrodes;

[0047] (3) A prism-type total reflection system with parallel light incidence is used to collect and save the real-time changes of the two-dimensional image of the working electrode (carbon felt loaded with catalyst) during the linear scanning voltammetry scanning process;

[0048] (4) Plotting the curve of light intensity variation over time (potential) at different positions of the image through the collected two-dimensional image group, comparing the light intensity variation curves at different positions, and converting them into a reaction activity distribution map. Selecting the light intensity variation curve at any point on the electrode and comparing it with the voltage-current density curve obtained by linear scanning voltammetry, as long as the basic shape of the curves is consistent, the feasibility of applying the present application to the characterization of electrode activity can be verified.

[0049] The relationship between the ratio of reflected light intensity to light source intensity and incident angle in 0.5M H2SO4 solution was tested. The results are as follows: Figure 3 As shown, from Figure 3 It can be seen that the light intensity ratio is very sensitive to the incident angle near 49°. When the incident angle is selected as 49.8°, the change in the light intensity ratio relative to the refractive index will be very significant.

[0050] The applicant has found that before a large number of macro bubbles are generated, there is a process of generating micro bubbles. During this process, the refractive index of the prism surface will undergo a slight change, which can be measured by TIR technology. The corresponding potential at this time is the starting potential. The relationship between the ratio of the reflected light intensity to the incident light intensity and the refractive index of the solution was tested at an incident angle of 49.8°. The results are as follows: Figure 4 As shown, from Figure 4 It can be seen that when bubbles are generated at the contact interface between the prism 21 and the water electrolysis electrode 42, the refractive index drops from n1 to n2, and the light intensity ratio increases significantly, which is reflected in the imaging detection module 3 to obtain the starting potential at different positions, and then judge the activity of the hydrogen evolution reaction.

[0051] The LSV curve obtained by scanning the three-electrode system in the electrochemical workstation 41 at 1mV / s linear scanning voltammetry is shown in Figure 5As shown in a, the TIR imaging diagram when the voltage is 0V is shown in b, and the relationship curve between the light intensity change and the scanning voltage corresponding to the three points A, B, and C in Figure b is shown in c. It can be seen from the figure that the light intensity change is consistent with the LSV curve obtained by the electrochemical workstation 41. Figure c proves that the TIR system can be used to characterize the activity of the local hydrogen evolution reaction. The potential when the light intensity just starts to change is the starting potential. The lower the starting potential, the better the electrode activity. The distribution diagram of the electrode starting potential is shown in d, indicating that the TIR system can well characterize the electrode reaction activity.

[0052] The TIR imaging image when the scanning voltage is -0.95V is as follows Figure 6 As shown, the bubble generation at different positions can be seen, and the bubbles are bright white, indicating that the TIR system can perform two-dimensional imaging of different positions of the electrode very well.

[0053] The above description is only a specific implementation mode of the present invention, not all implementation modes. Any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the specification of the present invention are covered by the claims of the present invention.

Claims

1. An online detection method for the distribution of electrolytic water electrode reaction activity, characterized in that: The reaction activity of the electrode is characterized by the starting potential, that is, the distribution of the reaction activity of the water electrolysis electrode is characterized by the distribution of the starting potential on the surface of the water electrolysis electrode; The online detection method of the initial potential distribution on the surface of the water electrolysis electrode comprises the following steps: (1) using a prism-type total reflection system with parallel light incident on the surface of the water electrolysis electrode to perform real-time imaging; while the prism-type total reflection system with parallel light incident on the surface of the water electrolysis electrode performs real-time imaging on the surface of the water electrolysis electrode, a potential scanning device module is used to perform potential scanning on the water electrolysis electrode; (2) obtaining the distribution of the initial potential on the surface of the water electrolysis electrode according to the change of light intensity over time or electric potential at different positions in the image, wherein the initial potential is the potential when the light intensity just starts to change; The parallel light incident prism type total reflection system comprises an incident parallel light module, a TIR module, and an imaging detection module arranged in sequence; the TIR module comprises a prism, and the prism is in direct contact with the water electrolysis electrode; The incident parallel light module is used to provide parallel incident light; The TIR module detects the change of refractive index by total reflection of parallel incident light at the contact surface between the TIR module and the water electrolysis electrode; The imaging detection module is used to collect the reflected light imaging of the water electrolysis electrode to obtain position information, and is used to detect the light intensity change in real time, and then obtain the starting potential when the refractive index changes at various locations on the surface of the water electrolysis electrode based on the relationship between light intensity and refractive index.

2. The online detection method for the distribution of electrolytic water electrode reaction activity according to claim 1, characterized in that: The online detection method of the initial potential distribution on the surface of the water electrolysis electrode specifically comprises the following steps: (1) Adjust the prism-type total reflection system with parallel light incident to a state where the surface of the water electrolysis electrode can be clearly imaged, and record a two-dimensional image of the water electrolysis electrode; (2) Using a potential scanning device module to perform potential scanning on the water electrolysis electrode; (3) A prism-type total reflection system with parallel light incidence is used to collect and save the real-time changes of the two-dimensional image of the water electrolysis electrode during the potential scanning process; (4) The light intensity at different positions in the image is plotted against time or potential using the acquired two-dimensional image group to obtain the initial potential distribution on the surface of the water electrolysis electrode, where the initial potential is the potential when the light intensity just starts to change.

3. The online detection method for the distribution of electrolytic water electrode reaction activity according to claim 1 or 2, characterized in that: The potential scanning device module causes the hydrogen evolution reaction to generate bubbles through potential scanning to produce a change in the refractive index of the surface of the water electrolysis electrode.

4. An online detection device for the distribution of electrolytic water electrode reaction activity, using the online detection method for the distribution of electrolytic water electrode reaction activity as claimed in claim 1 or 2 for detection, characterized in that: A prism-type total reflection system for incident parallel light, wherein the prism-type total reflection system for incident parallel light comprises an incident parallel light module, a TIR module, and an imaging detection module arranged in sequence; the TIR module comprises a prism with a refractive index of 1.75, and the prism is in direct contact with a water electrolysis electrode; The incident parallel light module is used to provide parallel incident light; The TIR module detects the change of refractive index by total reflection of parallel incident light at the contact surface between the TIR module and the water electrolysis electrode; The imaging detection module is used, on the one hand, to collect the reflected light imaging of the water electrolysis electrode to obtain position information, and on the other hand, to detect the light intensity change in real time, and then obtain the starting potential when the refractive index changes at various locations on the surface of the water electrolysis electrode based on the relationship between light intensity and refractive index. The reaction activity of the electrode is characterized by the starting potential, that is, the reaction activity distribution of the water electrolysis electrode is characterized by the starting potential distribution on the surface of the water electrolysis electrode.

5. The online detection device for the distribution of the electrolytic water electrode reaction activity according to claim 4, characterized in that: The incident parallel light module includes a point light source and a collimating lens arranged in sequence; The imaging detection module includes an imaging lens group and an area array camera which are arranged in sequence; the imaging detection module also includes a filter, and the filter is located between the TIR module and the imaging lens group.

6. The online detection device for the distribution of the electrolytic water electrode reaction activity according to claim 4, characterized in that: It also includes a potential scanning device module, which performs potential scanning on the water electrolysis electrode to promote the hydrogen evolution reaction to generate bubbles, so that the refractive index of the electrolyte at the water electrolysis electrode changes, thereby changing the intensity of the TIR reflected light; The potential scanning device module performs potential scanning on the water electrolysis electrode through an electrochemical workstation to promote hydrogen evolution reaction to generate bubbles to produce a change in the refractive index of the water electrolysis electrode surface.

7. The online detection device for the distribution of the electrolytic water electrode reaction activity according to claim 4, characterized in that: The water electrolysis electrode is a water electrolysis electrode that can be attached to the TIR module.

8. The online detection device for the distribution of the electrolytic water electrode reaction activity according to any one of claims 4 to 7, characterized in that: It also includes a vacuum sealing device, in which the TIR module and the water electrolysis electrode are located, and the vacuum sealing device is used to discharge bubbles generated after the test is completed, so that the electrolyte refills the gap between the TIR module and the water electrolysis electrode, so that the next test can be carried out without removing the sample; The vacuum sealing device comprises a sealing cover, a vacuum device, a window for incident light and a window for emitting light.

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