Nickel alloy electrode based on cyclic voltammetry scanning method and activation method and application thereof

Abstract

The invention discloses a nickel alloy electrode based on a cyclic voltammetry scanning method and an activation method and application thereof, according to the method, the prepared nickel alloy electrode is placed in a three-electrode electrolytic tank system for cyclic voltammetry scanning, and the activated nickel alloy electrode is obtained. By adopting the method disclosed by the invention, the porous catalyst layer with higher electrocatalytic activity and higher stability can be prepared on the electrode. The electrode prepared by the process can stably operate for a long time, and the degradation of heavy alcohol in industrial wastewater and coupled hydrogen production are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of inorganic functional electrode materials, and particularly relates to a nickel alloy electrode activated by cyclic voltammetry scanning method, an activation method thereof and an application thereof. Background Art

[0002] Industrial wastewater refers to the wastewater, sewage and waste liquid generated during industrial production, which contains industrial production materials, intermediate products and products lost with water, as well as pollutants generated during the production process. The output of industrial wastewater in China is huge, with an annual discharge of up to 17 billion cubic meters. Due to the diverse types of industrial wastewater, its composition is very complex, rich in a large amount of organic and inorganic pollutants. If it is discharged randomly, it will cause irreversible damage to the surrounding environment and ecology. Therefore, it is necessary to prevent and control wastewater pollution and make it harmless. At the same time, based on the high carbon content, high calorific value and high resource attributes of wastewater organic matter, resource conversion and high-value utilization should also be carried out. The market demand for the treatment of chemical heavy alcohol wastewater is huge, and the potential capital market is relatively large. If a technological breakthrough in the electrolytic coupling of alcohol organic matter wastewater to produce hydrogen can be achieved, it will bring huge economic value and social effects.

[0003] Electrocatalysts are the most important factors affecting the oxidation of organic substances such as ethylene glycol and ethanol, and their performance is usually comprehensively evaluated according to three criteria: activity, selectivity and stability. At the industrial application level, the cost of electrocatalysts and the Faraday efficiency are also important factors to be considered, because they determine the construction cost and treatment energy consumption of the electrochemical system. It is extremely challenging to find catalyst materials that meet all the above requirements. Although many papers on the electrochemical oxidation of ethylene glycol (EG) and ethanol (EtOH) have been published, there is currently no specific industrial device dedicated to the electrochemical treatment of heavy alcohol wastewater. Therefore, there is an urgent need to develop electrocatalysts suitable for industrial-scale applications. Nickel-copper-based catalysts have considerable performance in the electrooxidation of ethylene glycol, and are rich in reserves and have a reasonable price, making them ideal candidate materials for the industrial electrooxidation of heavy alcohol wastewater. However, when the catalysts prepared by laboratory research are put into industrial applications, they need to go through the step of activating the catalyst electrode first, because industrial electrodes (such as nickel mesh) generally have defects such as impurity elements and fewer exposed active sites, and need to go through electrochemical and non-electrochemical activation processes to further improve the performance of the catalyst electrode.

[0004] Patent Application No. 202310533621.5 discloses a pre-activation method for a nickel foam electrode active material and its application. Specifically, after cleaning the nickel foam material, it is subjected to gradient annealing treatment successively in an Ar / NH3 atmosphere and an air atmosphere to obtain the activated nickel foam electrode material. The activated nickel foam electrode material prepared by this invention has a surface structure feature of being loose and porous, increasing the specific surface area of the electrode material, thus increasing the contact area with the electrolyte and improving the electrochemical performance of the material. However, this activation method requires a high temperature of 1000°C and a long treatment time, and it is only applicable to the activation of catalyst substrate materials and does not involve the activation of the catalyst itself. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a method for activating a nickel alloy electrode by cyclic voltammetry scanning, the obtained electrode and its application. This activation method is simple to operate, time-consuming, directly improves the surface morphology of the catalyst layer, increases the number of active sites, and significantly enhances the oxidation performance of the electrode.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] The present invention first provides a method for activating a nickel alloy electrode based on cyclic voltammetry scanning, which is to place the prepared nickel alloy electrode in a three-electrode electrolytic cell system for cyclic voltammetry scanning to obtain the activated nickel alloy electrode; wherein, in the three-electrode electrolytic cell system, the nickel alloy electrode is the working electrode, the graphite rod is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the electrolyte is one of potassium hydroxide or sodium hydroxide solutions.

[0008] Preferably, during the activation process by cyclic voltammetry scanning, the low potential is set to 0V, the high potential is set to 0.8 - 1.5V, the scanning rate is set to 50 - 100mV / s, and the number of scanning cycles is 300 - 500 cycles. More preferably, the low potential is set to 0V, the high potential is set to 1V, the scanning rate is set to 50mV / s, and the number of scanning cycles is 300 cycles.

[0009] Preferably, the nickel alloy electrode is a copper-nickel alloy electrode prepared in the laboratory or a copper-nickel alloy electrode prepared by industrial plasma spraying method.

[0010] Preferably, the copper-nickel alloy electrode prepared in the laboratory is obtained by reducing Cu 2+ and Ni 2+ to obtain CuNi alloy nanoparticles, and then dispersing the CuNi alloy nanoparticles in a 5wt% Nafion and ethanol solution, and then adhering them to the carbon paper.

[0011] Preferably, the copper-nickel alloy electrode prepared by industrial plasma spraying method is to directly spray CuNi alloy powder on industrial nickel mesh by plasma spraying method.

[0012] Preferably, the concentration of the electrolyte is 1-3 mol / L.

[0013] The present invention also provides an activated nickel alloy electrode obtained by using the above nickel alloy electrode activation method. The surface of this electrode has the characteristics of being loose and porous. The oxidation current density of Ni increases from 43 mA / cm 2 to 49-55 mA / cm 2 , indicating that this activation method promotes the conversion of Ni to Ni 3+ / Ni 2+ , and has higher oxidability; the electrochemical double-layer capacitance of the nickel alloy electrode increases from 2.45 mF / cm 2 before activation to 5.4-6.15 mF / cm 2 , indicating that the activated copper-nickel alloy electrode has a larger active surface area and an increased number of active sites; the surface electron transfer resistance of the activated nickel alloy electrode is 9.4-12.5 Ω, which is much smaller than the surface electron transfer resistance of 29.5 Ω of the unactivated electrode, indicating that the activated electrode has a faster electron transfer speed. The activated copper-nickel alloy electrode can completely degrade the alcohol substances in the electrolyte after electrolysis for about 8 h in a mixed electrolyte solution of 1 mol / L potassium hydroxide and 0.1 mol / L ethanol or ethylene glycol, and at an industrial current density of 300 mA / cm 2 , this electrode can achieve stable electrolysis for 200 h.

[0014] The present invention also provides an application of the activated nickel alloy electrode obtained by using the above nickel alloy electrode activation method, which can be used as an anode electrocatalyst for treating heavy alcohol wastewater by industrial electrochemical oxidation method.

[0015] Compared with the prior art, the technical effects of the present invention are as follows:

[0016] (1) The activated copper-nickel electrode prepared by the present invention has a large porosity, thus effectively increasing the specific surface area of the material. At the same time, the method of activating the electrode by cyclic voltammetry can promote the conversion of Ni to Ni 2+ / Ni 3+ , form an amorphous hydroxide coating layer on the electrode surface, increase the number of active sites, and significantly improve the ability of electrochemical oxidation of heavy alcohol substances.

[0017] (2) The method of activating the electrode by cyclic voltammetry adopted by the present invention is simple in operation, short in activation time, high in preparation efficiency, and low in required cost, and can meet the industrial requirements. Description of the Drawings

[0018] Figure 1 Scanning electron microscope images of different electrodes, where (a) is the scanning electron microscope image of the unactivated copper-nickel alloy electrode, (b) is the scanning electron microscope image of the copper-nickel alloy electrode obtained in Example 1, (c) is the scanning electron microscope image of the copper-nickel alloy electrode obtained in Example 3, and (d) is the scanning electron microscope image of the copper-nickel alloy electrode obtained in Comparative Example 1.

[0019] Figure 2 The curve of cyclic voltammetry activation of the copper-nickel alloy electrode in Example 1 of the present invention.

[0020] Figure 3 The curve of electrochemical double-layer capacitance measured by cyclic voltammetry before and after activation of the copper-nickel alloy electrode in Example 1 of the present invention.

[0021] Figure 4 The electrochemical impedance spectra of the copper-nickel alloy electrode before and after activation in Example 1 of the present invention.

[0022] Figure 5 The cyclic voltammetry curves of electro-oxidizing ethanol of the copper-nickel alloy electrodes obtained in Example 1, Comparative Examples 1 and 2 of the present invention and the unactivated copper-nickel alloy electrode.

[0023] Figure 6 The concentration change curve of ethanol during the electro-oxidation of ethanol by the copper-nickel alloy electrodes obtained in Example 1, Comparative Examples 1 and 2 of the present invention and the unactivated copper-nickel alloy electrode.

[0024] Figure 7 The cyclic voltammetry curves of electro-oxidizing ethylene glycol of the copper-nickel alloy electrodes obtained in Example 1, Comparative Examples 1 and 2 of the present invention and the unactivated copper-nickel alloy electrode.

[0025] Figure 8 The concentration change curve of ethylene glycol during the electro-oxidation of ethylene glycol by the copper-nickel alloy electrodes obtained in Example 1, Comparative Examples 1 and 2 of the present invention and the unactivated copper-nickel alloy electrode.

[0026] Figure 9 The stability test curve of electro-oxidizing ethylene glycol by the copper-nickel alloy electrode obtained in Example 1 of the present invention at a current density of 300 mA / cm 2 Current density. Detailed implementation manners

[0027] The following describes the exemplary embodiments of the present invention in detail. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments can be achieved and various changes can be made to the present invention without departing from the spirit and scope of the present invention. The principles and features of the present invention are described below in conjunction with the accompanying drawings and specific embodiments. The examples are only for explaining the present invention and are not used to limit the scope of the present invention. Equivalent transformations or substitutions in function, method, or structure made by those of ordinary skill in the art according to these embodiments are all within the protection scope of the present invention.

[0028] For the materials, reagents, etc. used in the following embodiments, unless otherwise specified, they can all be obtained commercially.

[0029] Example 1

[0030] The activation method of the copper-nickel alloy electrode is as follows:

[0031] The copper-nickel alloy electrode prepared in the laboratory: Cu is reduced by sodium borohydride 2+ and Ni 2+ to obtain CuNi alloy nanoparticles, and then the CuNi alloy nanoparticles are dispersed in a 5wt% Nafion and ethanol solution, and then adhered to the carbon paper to obtain.

[0032] In a three-electrode electrolytic cell system, using the copper-nickel alloy electrode prepared in the laboratory as the working electrode, a graphite rod as the counter electrode, an Ag / AgCl electrode as the reference electrode, and the electrolyte as 1 mol / L KOH solution. During the cyclic voltammetry scanning activation process, the low potential is set to 0 V, the high potential is set to 1 V, the scanning rate is set to 50 mV / s, and the number of scanning cycles is 300 to obtain the activated copper-nickel alloy electrode.

[0033] The scanning electron microscope image of the activated copper-nickel alloy electrode is as Figure 1 (b) shown.

[0034] The test results of the intrinsic activity of the electrode show that: the oxidation current density of Ni is 53 mA / cm 2 , the electrochemical double-layer capacitance of the nickel alloy electrode is 6.15 mF / cm 2 , and the surface electron transfer resistance of the activated nickel alloy electrode is 9.4 Ω.

[0035] The electrochemical test results show that: in a mixed electrolyte solution of 1 mol / L potassium hydroxide and 0.1 mol / L ethanol or ethylene glycol, the electrode can completely degrade the alcohol substances in the electrolyte after electrolysis for 8 h. At an industrial current density of 300 mA / cm 2 , the electrode can achieve stable electrolysis for 200 h.

[0036] Example 2

[0037] The activation method of the copper-nickel alloy electrode is as follows:

[0038] The copper-nickel alloy electrode prepared in the laboratory: Cu is reduced by sodium borohydride 2+ and Ni 2+ to obtain CuNi alloy nanoparticles, and then the CuNi alloy nanoparticles are dispersed in a 5wt% Nafion and ethanol solution, and then adhered to carbon paper to obtain it.

[0039] In a three-electrode electrolytic cell system, using the copper-nickel alloy electrode prepared in the laboratory as the working electrode, a graphite rod as the counter electrode, and an Ag / AgCl electrode as the reference electrode, with the electrolyte being a 2mol / L KOH solution, during the activation process by cyclic voltammetry scanning, the low potential is set to 0V, the high potential is set to 0.8V, the scanning rate is set to 100mV / s, and the number of scanning cycles is 300 cycles, to obtain the activated copper-nickel alloy electrode.

[0040] The scanning electron microscope image of the activated copper-nickel alloy electrode is similar Figure 1 to that shown in (b).

[0041] The test results of the electrode intrinsic activity show that: the oxidation current density of Ni is 55mA / cm 2 , the electrochemical double-layer capacitance of the nickel alloy electrode is 5.8mF / cm 2 , and the surface electron transfer resistance of the activated nickel alloy electrode is 10.4Ω.

[0042] The electrochemical test results show that: in a mixed electrolyte solution of 1mol / L potassium hydroxide and 0.1mol / L ethanol or ethylene glycol, the electrode can achieve complete degradation of alcohol substances in the electrolyte after 8h of electrolysis. At an industrial current density of 300mA / cm 2 , the electrode can achieve stable electrolysis for 200h.

[0043] Example 3

[0044] The activation method of the copper-nickel alloy electrode is as follows:

[0045] The copper-nickel alloy electrode prepared industrially by plasma spraying method: directly spray CuNi alloy powder on industrial nickel mesh by plasma spraying method.

[0046] In a three - electrode electrolytic cell system, a copper - nickel alloy electrode prepared by industrial plasma spraying method is used as the working electrode, a graphite rod as the counter electrode, an Ag / AgCl electrode as the reference electrode, and the electrolyte is 2 mol / L NaOH solution. During the activation process by cyclic voltammetry scanning, the low potential is set to 0 V, the high potential is set to 1 V, the scanning rate is set to 50 mV / s, and the number of scanning cycles is 400 to obtain the activated copper - nickel alloy electrode.

[0047] The scanning electron microscope image of the activated copper - nickel alloy electrode is as Figure 1 (c) shown.

[0048] The test results of the intrinsic activity of the electrode show that: the oxidation current density of Ni is 49 mA / cm 2 , the electrochemical double - layer capacitance of the nickel - alloy electrode is 5.2 mF / cm 2 , and the surface electron transfer resistance of the activated nickel - alloy electrode is 12.5 Ω.

[0049] The electrochemical test results show that: in a mixed electrolyte solution of 1 mol / L potassium hydroxide and 0.1 mol / L ethanol or ethylene glycol, the electrode can achieve complete degradation of alcohol substances in the electrolyte after 8 h of electrolysis. At an industrial current density of 300 mA / cm 2 , the electrode can achieve 200 h of stable electrolysis.

[0050] Example 4

[0051] The activation method of the copper - nickel alloy electrode is as follows:

[0052] The copper - nickel alloy electrode prepared by industrial plasma spraying method: directly spray CuNi alloy powder on the industrial nickel mesh by plasma spraying method.

[0053] In a three - electrode electrolytic cell system, a copper - nickel alloy electrode prepared by industrial plasma spraying method is used as the working electrode, a graphite rod as the counter electrode, an Ag / AgCl electrode as the reference electrode, and the electrolyte is 3 mol / L NaOH solution. During the activation process by cyclic voltammetry scanning, the low potential is set to 0 V, the high potential is set to 1.5 V, the scanning rate is set to 60 mV / s, and the number of scanning cycles is 500 to obtain the activated copper - nickel alloy electrode.

[0054] The scanning electron microscope image of the activated copper - nickel alloy electrode is similar to Figure 1 (c) shown.

[0055] The test results of the intrinsic activity of the electrode show that: the oxidation current density of Ni is 50 mA / cm 2 , the electrochemical double - layer capacitance of the nickel - alloy electrode is 5.4 mF / cm 2 , and the surface electron transfer resistance of the activated nickel - alloy electrode is 11.6 Ω.

[0056] The results of electrochemical tests show that: in a mixed electrolyte solution of 1 mol / L potassium hydroxide and 0.1 mol / L ethanol or ethylene glycol, the alcohol substances in the electrolyte can be completely degraded after 8 hours of electrolysis with this electrode. At an industrial current density of 300 mA / cm 2 , this electrode can achieve stable electrolysis for 200 hours.

[0057] Figure 1 (a) is the scanning electron microscopy image of the unactivated copper-nickel alloy electrode. By Figure 1 (a) compared with Figure 1 (b) and Figure 1 (c), it can be seen that the surface of the unactivated copper-nickel alloy electrode is relatively smooth and the porosity is relatively low. After activation, the surface of the copper-nickel alloy electrode has the characteristics of being loose and porous, the porosity increases greatly, the active specific surface area increases, and more active sites are exposed.

[0058] Comparative Example 1

[0059] In this comparative example, cyclic voltammetry scanning activation was carried out using a magnesium sulfate solution as the electrolyte:

[0060] The copper-nickel alloy electrode prepared in the laboratory: Cu was reduced by sodium borohydride 2+ and Ni 2+ to obtain CuNi alloy nanoparticles, and then the CuNi alloy nanoparticles were dispersed in a 5 wt% Nafion and ethanol solution and adhered to the carbon paper to obtain it.

[0061] In a three-electrode electrolytic cell system, using the copper-nickel alloy electrode prepared in the laboratory as the working electrode, a graphite rod as the counter electrode, and an Ag / AgCl electrode as the reference electrode, with a 1 mol / L magnesium sulfate solution as the electrolyte, during the cyclic voltammetry scanning activation process, the low potential was set to 0 V, the high potential was set to 1 V, the scanning rate was set to 50 mV / s, and the number of scanning cycles was 300 to obtain the activated copper-nickel alloy electrode.

[0062] The scanning electron microscopy image of the activated copper-nickel alloy electrode is as shown in Figure 1 (d).

[0063] Comparative Example 2

[0064] In this comparative example, cyclic voltammetry scanning activation was carried out at a low potential:

[0065] The copper-nickel alloy electrode prepared in the laboratory: Cu was reduced by sodium borohydride 2+ and Ni 2+ to obtain CuNi alloy nanoparticles, and then the CuNi alloy nanoparticles were dispersed in a 5 wt% Nafion and ethanol solution and adhered to the carbon paper to obtain it.

[0066] In a three - electrode electrolytic cell system, a copper - nickel alloy electrode prepared in the laboratory is used as the working electrode, a graphite rod as the counter electrode, and an Ag / AgCl electrode as the reference electrode. The electrolyte is 1 mol / L KOH solution. During the activation process by cyclic voltammetry scanning, the low potential is set to 0 V, the high potential is set to 0.4 V, the scanning rate is set to 50 mV / s, and the number of scanning cycles is 300 to obtain the activated copper - nickel alloy electrode.

[0067] The scanning electron microscope image of the activated copper - nickel alloy electrode is similar to Figure 1 (d).

[0068] From Figure 1 (d) the scanning electron microscope image, it can be seen that the surface porosity of the copper - nickel alloy electrode obtained by activation in the comparative example has increased compared to the unactivated electrode, but there is a certain gap compared with the porosity of the copper - nickel alloy electrode obtained by the activation method in the example, indicating that the present invention has certain advantages.

[0069] Test experiment

[0070] Use a CHI760E electrochemical workstation to test the performance of the activated and unactivated copper - nickel alloy electrodes in the above - mentioned examples and comparative examples for the electrolysis of ethanol and ethylene glycol.

[0071] Figure 2 This is the curve during cyclic voltammetry activation of the copper - nickel alloy electrode in Example 1. Among them, the electrolyte is 1 mol / L KOH solution. During the activation process by cyclic voltammetry scanning, the low potential is set to 0 V, the high potential is set to 1 V, and the scanning rate is set to 50 mV / s. It can be seen from the curve in the figure that the oxidation current density of Ni increases from 43 mA / cm 2 to 53 mA / cm 2 , indicating that this activation method promotes the transformation of Ni to Ni 3+ / Ni 2+ .

[0072] Figure 3 This is the electrochemical double - layer capacitance curve measured by cyclic voltammetry before and after the activation of the copper - nickel alloy electrode in Example 1. The double - layer capacitance of the copper - nickel alloy electrode before activation is 2.45 mF / cm 2 , and the double - layer capacitance after activation is 6.15 mF / cm 2 , indicating that the activated copper - nickel alloy electrode has a larger active surface area and an increased number of active sites.

[0073] Figure 4Fig. 0 is the electrochemical impedance spectroscopy diagram of the copper-nickel alloy electrode before and after activation in Example 1. It can be seen from the curves in the figure that the surface electron transfer resistance of the activated electrode is much smaller than that of the unactivated electrode (the resistance value corresponds to the diameter of the semicircle), indicating that the activated electrode has a faster electron transfer rate.

[0074] Figure 5 Fig. 4 is the cyclic voltammetry curve of different electrodes in a mixed solution of 1 mol / L potassium hydroxide and 0.1 mol / L ethanol. Figure 6 Fig. 6 is the concentration change curve of ethanol during the electrooxidation of ethanol using different electrodes. From Figure 5 and 6 it can be seen that the copper-nickel alloy electrode obtained in Example 1 has the highest rate of ethanol oxidation. Complete oxidation of ethanol can be achieved in about 8 h. The rate of ethanol oxidation of the unactivated copper-nickel alloy electrode is the lowest, and only about 25% of ethanol can be oxidized in 8 h. The rates of ethanol oxidation of the copper-nickel alloy electrodes obtained in Comparative Examples 1 and 2 are between the two, and about 50% of ethanol can be oxidized in 8 h.

[0075] Figure 7 Fig. 14 is the cyclic voltammetry curve of different electrodes in a mixed solution of 1 mol / L potassium hydroxide and 0.1 mol / L ethylene glycol. Figure 8 Fig. 16 is the concentration change curve of ethylene glycol during the electrooxidation of ethylene glycol using different electrodes. From Figure 7 and 8 it can be seen that the copper-nickel alloy electrode obtained in Example 1 has the highest rate of ethylene glycol oxidation. Complete oxidation of ethylene glycol can be achieved in about 8 h. The rate of ethylene glycol oxidation of the unactivated copper-nickel alloy electrode is the lowest, and only about 25% of ethylene glycol can be oxidized in 8 h. The rates of ethylene glycol oxidation of the copper-nickel alloy electrodes obtained in Comparative Examples 1 and 2 are between the two, and about 45% of ethylene glycol can be oxidized in 8 h.

[0076] Meanwhile, further as shown in Figure 9 in a mixed solution of 1 mol / L potassium hydroxide and 0.1 mol / L ethylene glycol, using the copper-nickel alloy electrode obtained in Example 1 as the working electrode for a stability experiment, at a current density of 300 mA / cm 2 this electrode can achieve stable electrolysis for 200 h with little voltage change.

[0077] According to the above electrochemical tests, the copper-nickel alloy electrode obtained in the present invention has a high porosity, has more active sites, excellent ability to electrooxidize ethanol and ethylene glycol, good electrode stability, and can meet the industrial requirements to a certain extent.

[0078] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A nickel alloy electrode based on cyclic voltammetry scanning method, characterized in that, Cyclic voltammetry scanning was performed on a nickel alloy electrode in a three - electrode electrolytic cell system to obtain an activated nickel alloy electrode; among them, in the three - electrode electrolytic cell system, the nickel alloy electrode is the working electrode, the graphite rod is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the electrolyte is one of potassium hydroxide or sodium hydroxide solutions; the surface of the activated nickel alloy electrode has a loose and porous characteristic, the oxidation current density of Ni is 49 - 55 mA / cm 2 , the electrochemical double - layer capacitance is 5.4 - 6.15 mF / cm 2 , and the electron transfer resistance is 9.4 - 12.5 Ω.

2. The nickel alloy electrode based on cyclic voltammetry scanning method according to claim 1, characterized in that, In a mixed electrolyte solution of 1 mol / L potassium hydroxide and 0.1 mol / L ethanol or ethylene glycol, the complete degradation of alcohols in the electrolyte can be achieved by electrolysis for 8 h.

3. The nickel alloy electrode based on cyclic voltammetry scanning method according to claim 1, characterized in that, The electrode can achieve stable electrolysis for 200 h at an industrial current density of 300 mA / cm 2 .

4. A method for activating a nickel alloy electrode based on cyclic voltammetry scanning method, characterized in that, During the activation process by cyclic voltammetry scanning, the low potential is set at 0 V, the high potential is set at 0.8 - 1.5 V, the scanning rate is set at 50 - 100 mV / s, and the number of scanning cycles is 300 - 500.

5. The activation method of the nickel alloy electrode according to claim 2, characterized in that, During the activation process by cyclic voltammetry scanning, the low potential is set at 0 V, the high potential is set at 1 V, the scanning rate is set at 50 mV / s, and the number of scanning cycles is 300.

6. The nickel alloy electrode activation method according to claim 1, wherein: The nickel alloy electrode is a copper-nickel alloy electrode prepared in the laboratory or a copper-nickel alloy electrode prepared by plasma spraying method for industrial use.

7. The activation method of the nickel alloy electrode according to claim 4, characterized in that: The described laboratory-prepared copper-nickel alloy electrode is obtained by reducing Cu 2+ and Ni 2+ using sodium borohydride to obtain CuNi alloy nanoparticles, then dispersing the CuNi alloy nanoparticles in a 5 wt% Nafion and ethanol solution, and then adhering them to carbon paper.

8. The activation method of the nickel alloy electrode according to claim 4, characterized in that: The copper-nickel alloy electrode prepared by plasma spraying method for industrial use is directly spraying CuNi alloy powder on industrial nickel mesh by plasma spraying method.

9. The method for activating a nickel alloy electrode according to claim 1, characterized in that: The concentration of the electrolyte is 1 - 3 mol / L.

10. Application of the activated nickel alloy electrode obtained by using the nickel alloy electrode activation method as described in any one of claims 1-3, characterized in that: This electrode can be used as an anode electrocatalyst for treating heavy alcohol wastewater by industrial electrochemical oxidation method.

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