Preparation method and application of nickel-based bubble-free oxygen evolution electrode

Abstract

The invention discloses a nickel-based bubble-free oxygen evolution electrode preparation method and application thereof.The nickel-based bubble-free oxygen evolution electrode preparation method comprises the steps that cleaned foamed nickel is soaked in an aqueous solution containing ferric nitrate nonahydrate, nickel nitrate hexahydrate and urea, after magnetic stirring is conducted for 10 min, the foamed nickel is transferred into a reaction kettle to be subjected to a hydrothermal reaction, and a NiFe-coated NF electrode is prepared; the method comprises the following steps: adding PTFE particles and XC-72 carbon black into a mixed solution of ethanol and deionized water, and carrying out uniform ultrasonic dispersion to obtain a suspension; and spraying the suspension on the surface of the NiFe-coated NF electrode on one side by adopting a pressure spraying method. Water can be oxidized to generate oxygen by exposing one side of the NiFe electrocatalyst in the electrocatalytic water oxidation reaction. Due to the aerophile and hydrophobic characteristics of PTFE, generated oxygen can be extracted from the NiFe electrocatalyst side to the PTFE side through an efficient mass transfer channel in the PTFE, so that the problem of performance degradation caused by accumulation of oxygen bubbles on the surface of the NiFe catalyst is relieved, and the water electrolysis efficiency is improved. The technology has relatively high value for constructing an efficient and stable electrocatalytic water decomposition electrode.

Description

Technical Field

[0001] The present invention relates to the technical field of oxygen evolution electrode preparation, and particularly to a preparation method and application of a nickel-based bubble-free oxygen evolution electrode. Background Art

[0002] Hydrogen energy, with its high energy density and zero pollution characteristics, has become an ideal clean energy source to replace fossil fuels. The electrolytic water hydrogen production technology based on renewable energy (wind power / solar power / hydroelectric power) has become an important development path in the green hydrogen production system due to its zero carbon emission and high purity hydrogen production advantages. Among them, the alkaline electrolytic water technology occupies a dominant position due to its high industrial maturity, but it faces a gas-liquid mass transfer bottleneck at the electrode / electrolyte interface under high current density (>400 mA / cm 2 ), resulting in multiple energy efficiency losses. First, the rapid nucleation of gaseous products leads to the dense accumulation of bubbles, forming a viscous gas film, directly causing the loss of electrochemically active area and a sharp increase in activation overpotential; second, the transient pressure fluctuations generated during the bubble growth / desorption process induce the expansion of microcracks in the catalyst layer; third, the turbulent migration of bubbles in the electrolyte flow channel leads to an increase in local concentration polarization. This multi-stage cascade failure mechanism severely restricts the improvement of the power density of the electrolytic cell and has become one of the key bottlenecks restricting the large-scale application process of green hydrogen.

[0003] Currently, the industrial community mostly adopts external field intervention technologies to suppress bubbles on the electrode surface. For example, ultrasonic cavitation is used to break up adhered bubbles, mechanical convection flushing is used to remove newly formed bubbles, pressure pulsation is used to adjust buoyancy to accelerate desorption, and magnetic control strategies are used to direct the movement of bubbles. Although these multi-physical field collaborative schemes can improve the mass transfer efficiency, their inherent defect of relying on external energy input leads to an increase in system energy consumption, and the equipment complexity raises the initial investment cost, restricting large-scale application. To address the above problems, the present technology proposes to reconstruct the three-phase interface through a surface-functionalized gas diffusion electrode (GDE): based on a highly active catalyst carrier, a hydrophobic treatment and micro-nano regulation process are adopted to construct a GDE with a superhydrophobic coating. This design directionally regulates the bubble behavior through the gasophilic characteristics of the hydrophobic interface, synergistically optimizes the mass transfer path of the solid-liquid-gas three-phase interface, effectively suppresses the bubble coverage on the catalyst surface and strengthens the electrolyte contact, thereby significantly reducing the reaction overpotential without relying on external energy input.

[0004] Based on this, the present invention prepares the NiFe-PTFE@NF bubble-free oxygen evolution electrode by a two-step method. The preparation method described in the present invention can obtain an electrode with high activity and high stability by adjusting parameters such as the composition, concentration, ultrasonic time, ultrasonic power, and spraying distance of the spraying solution. This preparation method is conducive to the tight combination between the catalyst and the carrier, thereby improving its charge transport characteristics and mechanical stability, and has certain industrial application prospects. Summary of the Invention

[0005] To solve the above technical problems, a preparation method and application of a nickel-based bubble-free oxygen evolution electrode are provided, and the technical solution solves the problems proposed in the above background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A preparation method of a nickel-based bubble-free oxygen evolution electrode, comprising: S101. Immerse the cleaned nickel foam in an aqueous solution containing iron(III) nitrate nonahydrate, nickel(II) nitrate hexahydrate and urea, stir magnetically for 10 min, and then transfer it to a reaction kettle for hydrothermal reaction to obtain a NiFe@NF electrode; S102. Add PTFE particles and XC-72 carbon black to a mixed solution of ethanol and deionized water, and ultrasonically disperse them evenly to obtain a suspension; S103. Spray the suspension unilaterally on the surface of the NiFe@NF electrode by pressure spraying method, and obtain a NiFe-PTFE@NF bubble-free oxygen evolution electrode after sintering in a muffle furnace.

[0007] Preferably, in S101, the molar mass ratio of iron(III) nitrate nonahydrate, nickel(II) nitrate hexahydrate and urea is 1:1:10.

[0008] Preferably, in S101, the hydrothermal reaction is carried out in a polytetrafluoroethylene-lined high-pressure reaction kettle and reacts at a constant temperature of 120 °C for 12 h.

[0009] Preferably, in S102, the particle sizes of both XC-72 carbon black particles and PTFE particles are 50 nm, and the mass ratio is 1:1 to 1:3.

[0010] Preferably, in S102, the volume ratio of ethanol to deionized water is 3:1.

[0011] Preferably, in S102, the ultrasonic dispersion time is 2 - 60 min, and the ultrasonic frequency is 100 - 800 W.

[0012] Preferably, in S103, the working pressure range of the pressure spraying method is 0.2 - 0.4 MPa.

[0013] Preferably, in S103, the working pressure of the pressure spraying method is selected as 0.3 MPa.

[0014] Preferably, in S103, the calcination conditions are: heating to 250 - 380 °C at a heating rate of 2 - 10 °C / min, holding for 0.5 - 5 h, and then naturally cooling to room temperature.

[0015] The present invention also provides an application of the NiFe-PTFE@NF bubble-free oxygen evolution electrode prepared by the above preparation method in the preparation of O2 in an alkaline water electrolysis system, where the electrolyte is a 1 mol / L KOH solution and the working temperature is 25°C.

[0016] Compared with the prior art, the present invention provides a preparation method and an application of a nickel-based bubble-free oxygen evolution electrode, which have the following beneficial effects: 1. The nickel-based bubble-free oxygen evolution electrode described in the present invention has a superhydrophilic-superhydrophobic integrated coupling structure. The NiFe nanosheet structure is in-situ hydrothermally grown on nickel foam, with high dispersion, a large specific surface area, good conductivity, excellent charge transport characteristics, and shows excellent activity and stability during electrocatalytic water oxidation. On the other side of the electrode, hydrophobic particles PTFE are sprayed on the NiFe nanosheets and cured at low temperature to form a hydrophobic bubble extraction layer. The gasophilicity of the hydrophobic layer is used to drive oxygen bubbles to quickly detach, enabling the catalyst layer to be fully wetted by the electrolyte and further improving the catalytic performance of the NiFe electrocatalyst.

[0017] 2. The preparation method described in the present invention is simple to operate, and the required raw materials are all cheap and easily available. It has the advantage of rapid large-scale preparation and good industrial adaptability.

[0018] 3. The preparation method described in the present invention obtains a high-activity and high-stability electrode system by adjusting parameters such as the concentration ratio of suspension A, ultrasonic power, and ultrasonic time, so as to meet different requirements for catalytic performance. At the same time, the in-situ preparation method is beneficial to the tight combination between the catalyst and the conductive carrier, thereby improving its charge transport characteristics and mechanical stability, which is crucial in industrial applications. Description of the Drawings

[0019] Figure 1 It is a comparative diagram of linear voltammograms of NiFe-PTFE@NF, NiFe@NF, NF-PTFE, and NF electrodes in the present invention; Figure 2 It is a stability test diagram of the NiFe-PTFE@NF electrode in the present invention; Figure 3 It is a performance comparison diagram of linear voltammograms of NiFe-PTFE-C, NiFe-NF, and NiFE-NF-one-sided sealed electrodes in the present invention; Figure 4 It is a photo of the NiFe catalytic layer and the NiFe-PTFE layer immersed in water in the present invention; Figure 5 In the present invention, the hydrophobic angle of the NiFe-PTFE@NF layer is 152°, and the gasophobic angle of the NiFe catalytic layer is 136.8°. Detailed Embodiments

[0020] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be conceived by those skilled in the art.

[0021] Example 1 Please refer to Figures 1-5 As shown, a preparation method of a nickel-based bubble-free oxygen evolution electrode includes: S101. Dissolve 0.5 mmol of nickel nitrate hexahydrate, 0.5 mmol of iron nitrate nonahydrate, and 5 mmol of urea in 60 mL of deionized water, and magnetically stir for 10 min until it becomes clear; S102. Take nickel foam, about 5×5 cm 2 , 3 pieces, ultrasonically clean in an ultrasonic cleaner with 3 mol / L HCl solution for 15 min to remove the NiO layer on the surface, and then ultrasonically clean with deionized water and absolute ethanol for 15 min each, and vacuum dry at 80 °C for 2 h to ensure that the surface of the nickel foam is fully cleaned; S103. Transfer 1 piece of pretreated nickel foam and the precursor solution to a 100 mL polytetrafluoroethylene-lined autoclave, react at 120 °C for 12 h, after the reaction, ultrasonically clean with deionized water and ethanol for 5 min each, and vacuum dry at 80 °C for 6 h to obtain the NiFe@NF electrode, about 5×5 cm 2 ; S104. Disperse 5 mg / mL XC-72 carbon black particles and 5 mg / mL PTFE particles in an ethanol-water mixed solvent with a volume ratio of 3:1, ultrasonically treat for 15 min at a power of 800 W to prepare suspension A; S105. Spray and brush suspension A onto one side of the NiFe anode supported by nickel foam until a uniform layer of carbon black particles completely covers the electrode surface, and then anneal the electrode in a muffle furnace at 350 °C for 1 h to obtain the final nickel-based bubble-free oxygen evolution anode. Measured using a high-precision microbalance, the loading of the mixture is 8 - 10 mg / cm 2 , labeled as NiFe-PTFE@NF-1; S106. Cut the electrode into an area of 1×1 cm 2 for LSV test. It is measured that at a current density of 10 mA / cm 2 , the overpotential of the OER reaction is 139 mV, the contact angle of the hydrophobic coating is 152°. For Comparative Example 2 NiFe-NF, the overpotential of the OER reaction is 296 mV at a current density of 10 mA / cm2, and for Comparative Example 4 NiFe-NF - after single-sided sealing, the overpotential of the OER reaction is 353 mV.

[0022] Example 2 S201. Similar to the above steps 1 - 3, disperse 5 mg / mL XC - 72 carbon black (50 nm) and 10 mg / mL PTFE particles (50 nm) in an ethanol - water mixed solvent (volume ratio 3:1) at a mass ratio of 1:2, and ultrasonically treat for 15 min (power 800 W) to obtain suspension B; S202. Spray and brush suspension B onto one side of the NiFe anode supported by nickel foam until the electrode surface is completely covered with a uniform layer of carbon black particles, and then anneal this electrode in a muffle furnace at 350 °C for 1 h to obtain the final nickel - based bubble - free oxygen evolution anode. Measured using a high - precision microbalance, the loading of the mixture is 8 - 10 mg / cm 2 , labeled as NiFe - PTFE@NF - 2; S203. Cut this electrode into an area of 1×1 cm 2 for LSV testing. It is measured that at a current density of 10 mA / cm 2 , the over - potential of the OER reaction is 147 mV, and the contact angle of the hydrophobic coating is 156°. For Comparative Example 2 NiFe - NF, the over - potential of the OER reaction is 296 mV at a current density of 10 mA / cm 2 , and for Comparative Example 4 NiFe - NF - single - side sealed, the over - potential of the OER reaction is 353 mV.

[0023] Example 3 S301. Similar to the above steps 1 - 3, disperse 5 mg / mL XC - 72 carbon black (50 nm) and 15 mg / mL PTFE particles (50 nm) in an ethanol - water mixed solvent (volume ratio 3:1) at a mass ratio of 1:3, and ultrasonically treat for 15 min (power 800 W) to obtain suspension C; S302. Spray and brush suspension C onto one side of the NiFe anode supported by nickel foam until the electrode surface is completely covered with a uniform layer of carbon black particles, and then anneal this electrode in a muffle furnace at 350 °C for 1 h to obtain the final nickel - based bubble - free oxygen evolution anode. Measured using a high - precision microbalance, the loading of the mixture is 8 - 10 mg / cm2, labeled as NiFe - PTFE@NF - 3; S303. Cut this electrode into an area of 1×1 cm 2 for LSV testing. It is measured that at a current density of 10 mA / cm 2 , the over - potential of the OER reaction is 153 mV, and the contact angle of the hydrophobic coating is 154°. For Comparative Example 2 NiFe - NF, the over - potential of the OER reaction is 296 mV at a current density of 10 mA / cm 2 , and for Comparative Example 4 NiFe - NF - single - side sealed, the over - potential of the OER reaction is 353 mV.

[0024] Example 4 S401. Similar to the above steps 1 - 3, disperse 5 mg / mL XC - 72 carbon black (50 nm) and 5 mg / mL PTFE particles (50 nm) in an ethanol - water mixed solvent (volume ratio 3:1) at a mass ratio of 1:1, and ultrasonically treat for 5 min (power 100 W) to obtain suspension D; S402. Spray - brush suspension D onto one side of the NiFe anode supported by nickel foam until the electrode surface is completely covered with a uniform layer of carbon black particles, and then anneal this electrode in a muffle furnace at 350 °C for 1 h to obtain the final nickel - based bubble - free oxygen evolution anode. Measured using a high - precision microbalance, the loading of the mixture is 8 - 10 mg / cm 2 , labeled as NiFe - PTFE@NF - 4; S403. Cut this electrode into an area of 1×1 cm 2 for LSV testing. It is measured that at a current density of 10 mA / cm 2 , the over - potential of the OER reaction is 165 mV, and the contact angle of the hydrophobic coating is 125°. For Comparative Example 2 NiFe - NF, the over - potential of the OER reaction is 296 mV at a current density of 10 mA / cm 2 , and for Comparative Example 4 NiFe - NF - single - side sealed, the over - potential of the OER reaction is 353 mV.

[0025] Example 5 S501. Similar to the above steps 1 - 3, disperse 5 mg / mL XC - 72 carbon black (50 nm) and 5 mg / mL PTFE particles (50 nm) in an ethanol - water mixed solvent (volume ratio 3:1) at a mass ratio of 1:1, and ultrasonically treat for 10 min (power 100 W) to obtain suspension E; S502. Spray - brush suspension E onto one side of the NiFe anode supported by nickel foam until the electrode surface is completely covered with a uniform layer of carbon black particles, and then anneal this electrode in a muffle furnace at 350 °C for 1 h to obtain the final nickel - based bubble - free oxygen evolution anode. Measured using a high - precision microbalance, the loading of the mixture is 8 - 10 mg / cm 2 , labeled as NiFe - PTFE@NF - 5; S503. Cut this electrode into an area of 1×1 cm 2 for LSV testing. It is measured that at a current density of 10 mA / cm 2 , the over - potential of the OER reaction is 154 mV, and the contact angle of the hydrophobic coating is 131°. For Comparative Example 2 NiFe - NF, the over - potential of the OER reaction is 296 mV at a current density of 10 mA / cm 2 , and for Comparative Example 4 NiFe - NF - single - side sealed, the over - potential of the OER reaction is 353 mV.

[0026] Example 6 S601. Similar to the above steps 1 - 3, disperse 5 mg / mL XC - 72 carbon black (50 nm) and 5 mg / mL PTFE particles (50 nm) in an ethanol - water mixed solvent (volume ratio 3:1) at a mass ratio of 1:1, and ultrasonically treat for 15 min (power 100 W) to obtain suspension F; S602. Spray - brush suspension F onto one side of the NiFe anode supported by nickel foam until the electrode surface is completely covered with a uniform layer of carbon black particles, and then anneal this electrode in a muffle furnace at 350 °C for 1 h to obtain the final nickel - based bubble - free oxygen evolution anode. Measured using a high - precision microbalance, the loading of the mixture is 8 - 10 mg / cm 2 , labeled as NiFe - PTFE@NF - 6; S603. Cut this electrode into an area of 1×1 cm 2 for LSV test. It is measured that at a current density of 10 mA / cm 2 , the over - potential of the OER reaction is 143 mV, and the contact angle of the hydrophobic coating is 133°. For Comparative Example 2 NiFe - NF, the over - potential of the OER reaction is 296 mV at a current density of 10 mA / cm 2 , and for Comparative Example 4 NiFe - NF - single - side sealed, the over - potential of the OER reaction is 353 mV.

[0027] Example 7 S701. Similar to the above steps 1 - 3, disperse 5 mg / mL XC - 72 carbon black (50 nm) and 5 mg / mL PTFE particles (50 nm) in an ethanol - water mixed solvent (volume ratio 3:1) at a mass ratio of 1:1, and ultrasonically treat for 15 min (power 400 W) to obtain suspension G; S702. Spray - brush suspension G onto one side of the NiFe anode supported by nickel foam until the electrode surface is completely covered with a uniform layer of carbon black particles, and then anneal this electrode in a muffle furnace at 350 °C for 1 h to obtain the final nickel - based bubble - free oxygen evolution anode. Measured using a high - precision microbalance, the loading of the mixture is 8 - 10 mg / cm 2 , labeled as NiFe - PTFE@NF - 7; S703. Cut this electrode into an area of 1×1 cm 2 for LSV test. It is measured that at a current density of 10 mA / cm2, the over - potential of the OER reaction is 157 mV, and the contact angle of the hydrophobic coating is 137°. For Comparative Example 2 NiFe - NF, the over - potential of the OER reaction is 296 mV at a current density of 10 mA / cm 2 , and for Comparative Example 4 NiFe - NF - single - side sealed, the over - potential of the OER reaction is 353 mV.

[0028] Example 8 S801. Similar to the above steps 1 - 3, disperse 5 mg / mL XC - 72 carbon black (50 nm) and 5 mg / mL PTFE particles (50 nm) in an ethanol - water mixed solvent (volume ratio 3:1) at a mass ratio of 1:1, and ultrasonically treat for 15 min (power 200 W) to obtain suspension H; S802. Spray - brush suspension H onto one side of the NiFe anode supported by nickel foam until the electrode surface is completely covered with a uniform layer of carbon black particles, and then anneal this electrode in a muffle furnace at 350 °C for 1 h to obtain the final nickel - based bubble - free oxygen evolution anode. Measured using a high - precision microbalance, the loading of the mixture is 8 - 10 mg / cm 2 , marked as NiFe - PTFE@NF - 8; S803. Cut this electrode into an area of 1×1 cm 2 for LSV test. It is measured that at a current density of 10 mA / cm 2 , the over - potential of the OER reaction is 149 mV, and the contact angle of the hydrophobic coating is 152°. For Comparative Example 2 NiFe - NF, the over - potential of the OER reaction is 296 mV at a current density of 10 mA / cm 2 , and for Comparative Example 4 NiFe - NF - single - side sealed, the over - potential of the OER reaction is 353 mV.

[0029] The performance test results of Examples 1 - 8 are shown in Table 1: As mentioned above, these are only several embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, within the scope of the technical solution of the present invention, making some changes or modifications using the disclosed technical content is equivalent to equivalent implementation cases and all belong to the scope of the technical solution.

[0030] Control Example 1 Cut three pieces of nickel foam (about 5×5 cm 2 ), ultrasonically clean in a 3 mol / L HCl solution in an ultrasonic cleaner for 15 min to remove the surface NiO layer, and then ultrasonically clean with deionized water and absolute ethanol for 15 min each to ensure that the surface of the nickel foam is fully cleaned. After vacuum drying at 80 °C for 2 h, cut it into 1×1 cm 2 as a blank control electrode (marked as NF).

[0031] Control Example 2 Mix the nitrate - urea mixed solution in step 1 of Example 1 with the pretreated nickel foam (1×1 cm 2It was placed in a 100 mL polytetrafluoroethylene-lined high-pressure reactor and hydrothermally reacted at 120 °C for 12 h. After the reaction, it was ultrasonically cleaned with deionized water and ethanol for 5 min in sequence, and vacuum dried at 80 °C for 6 h to obtain the NiFe electrode supported on NF (marked as NiFe@NF).

[0032] Comparative Example 3 5 mg / mL of XC-72 carbon black (50 nm) and PTFE particles (50 nm) were dispersed in an ethanol-water mixed solvent (volume ratio 3:1) at a concentration of 5 mg / mL, and ultrasonically treated for 30 min (power 800 W) to obtain a uniform suspension H. The suspension H was spray-coated on the surface of the clean NF unilaterally by the pressure spraying method (working pressure 0.3 MPa, spraying angle 90°, vertical distance 15 cm), and a nickel-based superhydrophobic electrode without catalyst loading (marked as NF-PTFE) was obtained after sintering at 350 °C for 1 h.

[0033] Comparative Example 4 The NiFe-PTFE@NF electrode prepared in Example 1 was cut into 1×1 cm 2 and the PTFE-coated side was fully sealed with a high-temperature resistant silicone sealant to obtain a nickel-based electrode with single-sided sealing (marked as NiFe-PTFE@NF - single-sided sealing).

[0034] Performance Evaluation According to Figure 3 the LSV curve analysis with IR compensation, Example 1 (NiFe-PTFE@NF) achieved a current density of 420 mA / cm² at a cell voltage of 1.596 V vs. RHE, which was significantly better than Comparative Example 2 (NiFe@NF, 1.749 V @ 420 mA / cm² 2 ) and Comparative Example 4 (NiFe-PTFE - single-sided sealing, 1.902 V @ 420 mA / cm² 2 ), and its overpotential decreased by 153 mV (corresponding to a 10% increase in activity) and 306 mV (corresponding to a 20% increase in activity) respectively. At the same cell voltage (1.596 V), the current density of Example 1 reached 420 mA / cm² 2 (52.5 mA / cm² for Comparative Example 2 2 ), and the performance improvement amplitude reached 700%. 2

[0035] Combined with the electrochemical kinetics analysis, the exponential growth characteristic of the electrolytic water LSV curve (indicating that as the current density further increases to the industrial level (>1 A / cm² 2 ), the overpotential advantage of Example 1 will be more significant. This characteristic makes it have the potential for large-scale application in low-energy-consuming and high-production-capacity electrolytic cells (such as pressurized alkaline electrolytic cells, anion exchange membrane electrolytic cells).

[0036] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a nickel-based bubble-free oxygen evolution electrode, characterized in that: include: S101, soaking the cleaned nickel foam in an aqueous solution containing iron nitrate nonahydrate, nickel nitrate hexahydrate and urea, stirring magnetically for 10 minutes, and then transferring to a reactor for hydrothermal reaction to obtain a NiFe@NF electrode; S102, adding PTFE particles and XC-72 carbon black to a mixed solution of ethanol and deionized water, and uniformly dispersing by ultrasonication to obtain a suspension; S103, using a pressure jet method to spray the suspension onto the surface of the NiFe@NF electrode on one side, and obtaining a NiFe-PTFE@NF bubble-free oxygen evolution electrode after sintering in a muffle furnace.

2. The method for preparing a nickel-based bubble-free oxygen evolution electrode according to claim 1, characterized in that: The molar mass ratio of iron nitrate nonahydrate, nickel nitrate hexahydrate and urea in S101 is 1:1:

10.

3. The method for preparing a nickel-based bubble-free oxygen evolution electrode according to claim 1, characterized in that: The hydrothermal reaction in S101 is carried out in a polytetrafluoroethylene-lined high-pressure reactor at a constant temperature of 120° C. for 12 hours.

4. The method for preparing a nickel-based bubble-free oxygen evolution electrode according to claim 1, characterized in that: The particle sizes of the XC-72 carbon black particles and the PTFE particles in the S102 are both 50 nm, and the mass ratio is 1:1-1:

3.

5. The method for preparing a nickel-based bubble-free oxygen evolution electrode according to claim 1, characterized in that: The volume ratio of ethanol to deionized water in S102 is 3:

1.

6. The method for preparing a nickel-based bubble-free oxygen evolution electrode according to claim 1, characterized in that: The ultrasonic dispersion time in S102 is 2-60 min, and the ultrasonic frequency is 100-800 W.

7. The method for preparing a nickel-based bubble-free oxygen evolution electrode according to claim 1, characterized in that: The working pressure range of the pressure injection method in S103 is 0.2-0.4 MPa.

8. The method for preparing a nickel-based bubble-free oxygen evolution electrode according to claim 7, characterized in that: The working pressure of the pressure injection method in S103 is selected to be 0.3 MPa.

9. The method for preparing a nickel-based bubble-free oxygen evolution electrode according to claim 1, characterized in that: The calcination conditions in S103 are: heating to 250-380° C. at a heating rate of 2-10° C. / min, keeping the temperature for 0.5-5 h, and then naturally cooling to room temperature.

10. An application of a NiFe-PTFE@NF bubble-free oxygen evolution electrode prepared by the preparation method according to any one of claims 1 to 9 in preparing O2 in an alkaline water electrolysis system, wherein the electrolyte is a 1 mol / L KOH solution and the operating temperature is 25°C.

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