CN110711597B - A kind of Co-Mo-P-O electrocatalyst and its preparation method and application - Google Patents

Abstract

The invention discloses a Co-Mo-P-O electrocatalyst and a preparation method and application thereof. The Co‑Mo‑P‑O electrocatalyst is an amorphous nanoparticle film comprising four elements of Co, Mo, P and O supported on a conductive substrate. The preparation method is to use a three-electrode electrochemical system to carry out electrochemical deposition in an aqueous solution containing cobalt sulfate, sodium molybdate, sodium hypophosphite and sodium citrate, and use a conductive substrate, a platinum sheet and a saturated calomel electrode as the work respectively. electrode, counter electrode and reference electrode. The preparation method of the Co-Mo-P-O electrocatalyst of the present invention is simple and feasible, exhibits excellent performance in the hydrogen evolution reaction of electrolytic water, the oxygen evolution reaction of electrolytic water and the application of complete electrolysis of water, and is expected to obtain large-scale application in industry .

Description

A kind of Co-Mo-P-O electrocatalyst and its preparation method and application

technical field

The invention belongs to the field of electrocatalyst nanomaterials, and in particular relates to a Co-Mo-P-O electrocatalyst and a preparation method and application thereof.

Background technique

With the growth and development of the global population, fossil energy such as coal and petroleum are used in large quantities. The limited storage of these fossil energy sources and the environmental pollution caused by their use have forced mankind to seek new clean energy sources to replace fossil energy sources. Hydrogen is attracting extensive attention as a clean and efficient energy source. Hydrogen production from water electrolysis is considered to be a very promising method for hydrogen production due to its environmental friendliness and high efficiency. However, its high energy consumption limits its wide-ranging industrial applications. The use of appropriate electrocatalysts can reduce the activation energy of the water splitting reaction and speed up the reaction kinetics, thereby improving the efficiency of electrolysis of water to produce hydrogen and reducing energy consumption.

Water electrolysis mainly consists of two half-reactions: the cathodic hydrogen evolution reaction and the anodic oxygen evolution reaction. Compared with the hydrogen evolution reaction, the multi-electron reaction steps of the oxygen evolution reaction cause its slower kinetics. Therefore, the development of a highly active oxygen evolution electrocatalyst is also of great significance for the electrolysis of water to produce hydrogen. At the same time, if the prepared electrocatalyst has dual functions, that is, it can catalyze both hydrogen evolution and oxygen evolution efficiently, it will make a great contribution to reducing production costs and simplifying production processes.

At present, the hydrogen evolution and oxygen evolution catalysts with the best electrocatalytic performance are Pt-based and Ir-based compounds, respectively. However, the high cost and small reserves of such precious metals limit their large-scale industrial application. Transition metals have the characteristics of low cost, abundant reserves and excellent electrocatalytic performance, and are currently being used in a large number of researches. Therefore, it is necessary to use transition metal systems to prepare highly active hydrogen evolution and oxygen evolution catalysts for water electrolysis.

SUMMARY OF THE INVENTION

The first object of the present invention is to provide a novel Co-Mo-P-O electrocatalyst.

The second object of the present invention is to provide a preparation method of Co-Mo-P-O electrocatalyst.

The third object of the present invention is to provide the application of Co-Mo-P-O electrocatalyst for realizing high-performance hydrogen evolution reaction of water electrolysis, oxygen evolution reaction of water electrolysis and complete water electrolysis reaction.

To achieve the above object, the present invention adopts the following technical solutions:

In a first aspect, the present invention provides a Co-Mo-P-O electrocatalyst, wherein the Co-Mo-P-O electrocatalyst is an amorphous nanoparticle film comprising four elements of Co, Mo, P, and O supported on a conductive substrate .

In the Co-Mo-P-O electrocatalyst of the present invention, Co, Mo, P and O are uniformly distributed in the whole film, and the surface of the film is highly rough. The Co-Mo-P-O electrocatalyst has a highly rough surface, a large electrochemically active area, and excellent electrical conductivity.

Preferably, the conductive substrate is foamed nickel, nickel sheet or ITO glass. Those skilled in the art can easily understand that the conductive substrate here can be any conductive substrate.

In a second aspect, the present invention provides a method for preparing a Co-Mo-P-O electrocatalyst, comprising the following steps:

1) prepare an electrolyte aqueous solution containing cobalt sulfate, sodium molybdate, sodium hypophosphite and sodium citrate;

2) In a three-electrode electrochemical system, a conductive substrate is used as a working electrode, and a constant potential is applied to the working electrode for electrochemical deposition, that is, a Co-Mo-P-O electrocatalyst is obtained.

Each step is explained in detail below:

Step 1): Prepare an aqueous electrolyte solution containing cobalt sulfate, sodium molybdate, sodium hypophosphite and sodium citrate.

Preferably, the concentration of each component in the electrolyte aqueous solution is: 0.15mol/L cobalt sulfate, 0.05mol/L sodium molybdate, 0.05mol/L-0.6mol/L sodium hypophosphite, 0.15mol/L sodium citrate .

Step 2): in a three-electrode electrochemical system, a conductive substrate is used as a working electrode, and a constant potential is applied to the working electrode for electrochemical deposition, that is, a Co-Mo-P-O electrocatalyst is obtained.

Preferably, the conductive substrate is any conductive substrate such as nickel foam, nickel sheet or ITO glass.

Preferably, in the three-electrode electrochemical system, a platinum sheet is used as a counter electrode, and a saturated calomel electrode (SCE) is used as a reference electrode.

Preferably, the constant potential is -2.0V (relative to a saturated calomel electrode). It will be understood by those skilled in the art that the potential value is different depending on the reference electrode. With different potential values, the electrodeposition rate is different, and the morphology will also change; and this application is based on the reference electrode saturated calomel electrode, under the condition of a constant potential of -2.0V, the limited performance and structure are obtained. Co-Mo-P-O electrocatalyst.

Preferably, the electrochemical deposition is carried out at room temperature with continuous stirring by a magnetic stirrer at a stirring speed of 200-500 rpm; preferably 300 rpm.

Preferably, the deposition time is 5 minutes. If the deposition time is too long, the deposited film is easy to fall off. In the research process of the present invention, 5 minutes is the best time, and the electrocatalyst deposited on the nickel foam starts to fall off after more than 5 minutes.

In a third aspect, the present invention provides the application of the above Co-Mo-P-O electrocatalyst in the hydrogen evolution reaction of electrolyzed water, the oxygen evolution reaction of electrolyzed water and fully electrolyzed water.

Specifically, the application of the above Co-Mo-P-O electrocatalyst in the hydrogen evolution reaction of water electrolysis, the oxygen evolution reaction of water electrolysis and complete electrolysis of water includes the following aspects:

1) Using the Co-Mo-PO electrocatalyst as the cathode for the hydrogen evolution reaction of water electrolysis, the overpotential when the current density is 10 mA/cm ² is only 97 mV.

2) Using the Co-Mo-PO electrocatalyst as the anode for water electrolysis and oxygen evolution reaction, the overpotential at a current density of 10 mA/cm ² is only 260.4 mV.

3) Using the Co-Mo-PO electrocatalyst as anode and cathode for complete water electrolysis reaction respectively, the voltage when the current density is 10 mA/cm ² is only 1.62 V.

In the embodiment of the present invention, the tests carried out with respect to the above applications are as follows:

Applications 1) and 2) were carried out in 1 mol/L KOH aqueous solution with Co-Mo-P-O electrocatalyst as working electrode, graphite rod and mercury/mercury oxide electrode as counter electrode and reference electrode, respectively. Before the start of the test, nitrogen gas was injected into the electrolyte for 30 minutes, and the nitrogen gas was continuously injected into the electrolyte at a flow rate of 20 mL/min until the end of the test. The test was performed at room temperature with a constant stirring rate of 200 rpm. The Co-Mo-P-O electrocatalysts were tested for the hydrogen evolution reaction and oxygen evolution performance of water electrolysis in the range of -0.27-1.60 V (relative to the reversible hydrogen electrode) by linear sweep voltammetry.

Application 3) uses Co-Mo-P-O electrocatalysts as anode and cathode, respectively, and conducts complete electrolysis of water in 1 mol/L KOH aqueous solution. Before the test starts, nitrogen gas was injected into the electrolyte for 30 minutes, and nitrogen gas was continuously injected into the electrolyte at a flow rate of 20 mL/min until the test was over. The test was performed at room temperature with a constant stirring rate of 200 rpm. The complete water electrolysis performance of the Co-Mo-P-O electrocatalyst was tested by linear sweep voltammetry in the range of 1.23-1.70 V.

The beneficial effects of the present invention are as follows:

The advantages of the Co-Mo-PO electrocatalyst of the present invention lie in: the amorphous Co-Mo-PO electrocatalyst supported on a conductive substrate has a highly rough surface, a large electrochemical active area and excellent electrical conductivity; The electrodeposition method prepared by the Co-Mo-PO electrocatalyst is simple in process, high in repeatability and low in cost; the Co-Mo-PO electrocatalyst of the present invention can be used as a bifunctional catalyst to be applied in the hydrogen evolution reaction of water electrolysis and the oxygen evolution reaction of electrolytic water, Thus, the Co-Mo-PO electrocatalyst can be used as both cathode and anode for complete water electrolysis. When using the Co-Mo-PO electrocatalyst of the present invention to catalyze the hydrogen evolution reaction of water electrolysis, it shows a low electrocatalytic water splitting hydrogen evolution overpotential, and the required overpotential of the current density of 10mA/cm ² is only 97mV; using the present invention When the Co-Mo-PO electrocatalyst of the present invention catalyzes the electrolysis of water for oxygen evolution, the required overpotential of the current density of 10mA/cm ² is only 260.4mV; the Co-Mo-PO electrocatalyst of the present invention is used as both the cathode and the anode for complete When electrolyzing water, it shows better performance than similar catalysts, with low overpotential and good stability. When the current density is 10mA/cm ² , only 1.57V external voltage is required. The novel Co-Mo-PO electrocatalyst of the invention has the advantages of simple preparation method, high repeatability, low cost, extremely high catalytic activity, and can be widely applied to industrial production of electrolytic water for hydrogen production.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a SEM image of the Co-Mo-P-O electrocatalyst in Example 5 of the present invention.

FIG. 2 is the EDX energy spectrum of the Co-Mo-P-O electrocatalyst in Example 5 of the present invention.

Figure 3a is a TEM image of the Co-Mo-P-O electrocatalyst in Example 5 of the present invention.

Figure 3b is a Mapping diagram of Co element in the Co-Mo-P-O electrocatalyst in Example 5 of the present invention.

Figure 3c Mapping diagram of Mo element in the Co-Mo-P-O electrocatalyst in Example 5 of the present invention.

Fig. 3d Mapping diagram of P element in the Co-Mo-P-O electrocatalyst in Example 5 of the present invention.

Figure 3e Mapping diagram of O element in the Co-Mo-P-O electrocatalyst in Example 5 of the present invention.

4 is the XRD pattern of the Co-Mo-P-O electrocatalyst in Example 5 of the present invention.

Fig. 5 is the hydrogen evolution performance curve of electrolysis water of the Co-Mo-P-O electrocatalyst of Example 6 of the present invention.

FIG. 6 is the performance curve of the electrolysis of water for hydrogen evolution of the Co-Mo-P-O electrocatalyst in Example 7 of the present invention.

Fig. 7 is the oxygen evolution performance curve of electrolyzed water of the Co-Mo-P-O electrocatalyst of Example 8 of the present invention.

Fig. 8 is the reaction performance curve of the complete electrolysis of water of the Co-Mo-P-O electrocatalyst of Example 9 of the present invention.

Detailed ways

In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Example 1

A 2cm×2cm nickel sheet was placed in acetone, ethanol and 1M hydrochloric acid in sequence for ultrasonic cleaning for 15 min, then rinsed with a large amount of deionized water and dried with nitrogen. An electrolyte solution containing the following components was prepared: 0.15 mol/L CoSO ₄ , 0.05 mol/L NaMoO ₄ , 0.6 mol/L NaH ₂ PO ₂ , and 0.15M Na ₃ C ₆ H ₅ O ₇ . In the three-electrode electrochemical system, the cleaned nickel sheet, platinum sheet and saturated calomel electrode were used as working electrode, counter electrode and reference electrode, respectively. At room temperature, a potential of −2 V (relative to the saturated calomel electrode) was applied to the working electrode by an electrochemical workstation, and the electroplating was carried out for 5 min. During the deposition process, the reaction system was stirred by a magnetic stirrer at 300 rpm. After the electrochemical deposition, the nickel sheet was taken out, rinsed with a large amount of deionized water, and blown dry with nitrogen to obtain a Co-Mo-PO electrocatalyst.

Example 2

A 2cm×2cm nickel sheet was placed in acetone, ethanol and 1M hydrochloric acid in sequence for ultrasonic cleaning for 15 min, then rinsed with a large amount of deionized water and dried with nitrogen. An electrolyte solution containing the following components was prepared: 0.15 mol/L CoSO ₄ , 0.05 mol/L NaMoO ₄ , 0.5 mol/L NaH ₂ PO ₂ , and 0.15M Na ₃ C ₆ H ₅ O ₇ . In the three-electrode electrochemical system, the cleaned nickel sheet, platinum sheet and saturated calomel electrode were used as working electrode, counter electrode and reference electrode, respectively. At room temperature, a potential of −2 V (relative to the saturated calomel electrode) was applied to the working electrode by an electrochemical workstation, and the electroplating was carried out for 5 min. During the deposition process, the reaction system was stirred by a magnetic stirrer at 300 rpm. After the electrochemical deposition, the nickel sheet was taken out, rinsed with a large amount of deionized water, and blown dry with nitrogen to obtain a Co-Mo-PO electrocatalyst.

Example 3

The 2cm×2cm nickel flakes were placed in acetone, ethanol and 1M hydrochloric acid for ultrasonic cleaning for 15min in turn, then rinsed with a large amount of deionized water and dried with nitrogen. An electrolyte solution containing the following components was prepared: 0.15 mol/L CoSO ₄ , 0.05 mol/L NaMoO ₄ , 0.3 mol/L NaH ₂ PO ₂ , and 0.15M Na ₃ C ₆ H ₅ O ₇ . In the three-electrode electrochemical system, the cleaned nickel sheet, platinum sheet and saturated calomel electrode were used as working electrode, counter electrode and reference electrode, respectively. At room temperature, a potential of −2 V (relative to the saturated calomel electrode) was applied to the working electrode by an electrochemical workstation, and the electroplating was carried out for 5 min. During the deposition process, the reaction system was stirred by a magnetic stirrer at 300 rpm. After the electrochemical deposition, the nickel sheet was taken out, rinsed with a large amount of deionized water, and blown dry with nitrogen to obtain a Co-Mo-PO electrocatalyst.

Example 4

A 2cm×2cm nickel sheet was placed in acetone, ethanol and 1M hydrochloric acid in sequence for ultrasonic cleaning for 15 min, then rinsed with a large amount of deionized water and dried with nitrogen. An electrolyte solution containing the following components was prepared: 0.15 mol/L CoSO ₄ , 0.05 mol/L NaMoO ₄ , 0.05 mol/L NaH ₂ PO ₂ , and 0.15M Na ₃ C ₆ H ₅ O ₇ . In the three-electrode electrochemical system, the cleaned nickel sheet, platinum sheet and saturated calomel electrode were used as working electrode, counter electrode and reference electrode, respectively. At room temperature, a potential of −2 V (relative to the saturated calomel electrode) was applied to the working electrode by an electrochemical workstation, and the electroplating was carried out for 5 min. During the deposition process, the reaction system was stirred by a magnetic stirrer at 300 rpm. After the electrochemical deposition, the nickel sheet was taken out, rinsed with a large amount of deionized water, and blown dry with nitrogen to obtain a Co-Mo-PO electrocatalyst.

Example 5

The 2cm×2cm nickel foam was placed in acetone, ethanol and 1M hydrochloric acid in sequence for ultrasonic cleaning for 15 min, then rinsed with a large amount of deionized water and dried with nitrogen. An electrolyte solution containing the following components was prepared: 0.15 mol/L CoSO ₄ , 0.05 mol/L NaMoO ₄ , 0.5 mol/L NaH ₂ PO ₂ , and 0.15M Na ₃ C ₆ H ₅ O ₇ . In the three-electrode electrochemical system, the cleaned nickel foam, platinum sheet and saturated calomel electrode were used as working electrode, counter electrode and reference electrode, respectively. At room temperature, a potential of −2 V (relative to the saturated calomel electrode) was applied to the working electrode by an electrochemical workstation, and the electroplating was carried out for 5 min. During the deposition process, the reaction system was stirred by a magnetic stirrer at 300 rpm. After the electrochemical deposition, the nickel foam was taken out, rinsed with a large amount of deionized water, and blown dry with nitrogen to obtain a Co-Mo-PO electrocatalyst.

The Co-Mo-P-O electrocatalyst prepared in Example 5 was characterized by various means. The morphologies of the Co-Mo-P-O electrocatalysts are shown in the SEM images of Fig. 1. Figure 2 shows the EDX energy spectrum of the Co-Mo-P-O electrocatalyst. It can be seen that the Co-Mo-P-O electrocatalyst is composed of four elements, Co, Mo, P, and O. Among them, Cu and C come from the energy spectrum characterization. substrate used. Figures 3a-3e are the TEM images of the Co-Mo-P-O electrocatalyst and the corresponding element Mapping images, of which Figure 3a- is the TEM morphology of the Co-Mo-P-O particles, Figure 3b, Figure 3c, Figure 3d, Figure 3 3e is the distribution map of the corresponding elements of Co, Mo, P, and O, respectively. It can be seen that the four elements of Co, Mo, P, and O are uniformly distributed in the whole particle. Figure 4 shows the XRD pattern of the Co-Mo-P-O electrocatalyst. It can be seen that in the XRD pattern of the Co-Mo-P-O electrocatalyst, except for the base peak of Ni, no other peaks appear, indicating that the Co-Mo-P-O electrocatalyst is a Amorphous structure.

Example 6

The Co-Mo-PO electrocatalyst of Example 2 was used as the working electrode, the graphite rod and the mercury/mercury oxide electrode were used as the counter electrode and the reference electrode respectively, and the electrochemical three-electrode system was used to test the embodiment in a 1mol/L KOH aqueous solution. 2. Hydrogen evolution performance of Co-Mo-PO electrocatalysts for water electrolysis. Before the start of the test, nitrogen gas was injected into the electrolyte for 30 minutes, and the nitrogen gas was continuously injected into the electrolyte at a flow rate of 20 mL/min until the end of the test. The test was performed at room temperature with a constant stirring rate of 200 rpm. The hydrogen evolution performance of the Co-Mo-PO electrocatalyst of Example 2 was tested in the range of -0.23-0V (relative to the reversible hydrogen electrode) by linear sweep voltammetry, and the results are shown in FIG. 5 . When the current density reaches 10 mA/ ^cm2 , the overpotential is as low as 121.9 mV, indicating that the catalyst has excellent catalytic activity for hydrogen evolution.

Example 7

The Co-Mo-PO electrocatalyst of Example 5 was used as the working electrode, the graphite rod and the mercury/mercury oxide electrode were used as the counter electrode and the reference electrode respectively, and the electrochemical three-electrode system was used in the 1mol/L KOH aqueous solution to test the example. 5. Hydrogen evolution performance of Co-Mo-PO electrocatalysts for water electrolysis. Before the start of the test, nitrogen gas was injected into the electrolyte for 30 minutes, and the nitrogen gas was continuously injected into the electrolyte at a flow rate of 20 mL/min until the end of the test. The test was performed at room temperature with a constant stirring rate of 200 rpm. The hydrogen evolution performance of the Co-Mo-PO electrocatalyst of Example 5 was tested in the range of -0.27-0V (relative to the reversible hydrogen electrode) by linear sweep voltammetry, and the results are shown in FIG. 6 . When the current density reaches 10mA/ ^cm2 , the overpotential is as low as 97mV, which is lower than the Co-Mo-PO electrocatalyst with the same electrodeposition conditions except that the conductive substrate is different in Example 6, which proves that the foamed nickel conductive substrate is compared with the nickel sheet. The conductive substrate is more beneficial to reduce the overpotential of the hydrogen evolution reaction of electrolyzed water, because the three-dimensional framework structure of nickel foam is more conducive to exposing more active sites.

Example 8

The Co-Mo-PO electrocatalyst of Example 5 was used as the working electrode, and the graphite rod and the mercury/mercury oxide electrode were used as the counter electrode and the reference electrode respectively, and the electrochemical three-electrode system was used in the 1mol/L KOH aqueous solution to test the example. 5. Oxygen evolution performance of Co-Mo-PO electrocatalysts for water electrolysis. Before the start of the test, nitrogen gas was injected into the electrolyte for 30 minutes, and the nitrogen gas was continuously injected into the electrolyte at a flow rate of 20 mL/min until the end of the test. The test was performed at room temperature with a constant stirring rate of 200 rpm. The oxygen evolution performance of the Co-Mo-PO electrocatalyst of Example 5 was tested in the range of 1.12-1.60 V (relative to the reversible hydrogen electrode) by linear sweep voltammetry, and the results are shown in FIG. 7 . When the current density reaches 10 mA/ ^cm2 , the overpotential is as low as 260.4 mV, indicating that the catalyst has excellent catalytic activity for oxygen evolution.

Example 9

The Co-Mo-PO electrocatalyst of Example 5 was used as the anode and the cathode, respectively, and an electrochemical two-electrode system was used to conduct a complete electrolysis of water in a 1 mol/L KOH aqueous solution. Before the start of the test, nitrogen gas was injected into the electrolyte for 30 minutes, and the nitrogen gas was continuously injected into the electrolyte at a flow rate of 20 mL/min until the end of the test. The test was performed at room temperature with a constant stirring rate of 200 rpm. The complete water electrolysis performance of the Co-Mo-PO electrocatalyst was tested by linear sweep voltammetry in the voltage range of 1.23-1.70 V, and the results are shown in Figure 8. When the current density reaches 10 mA/ ^cm2 , the required supply voltage is as low as 1.62 V, indicating that the bifunctional catalyst has excellent catalytic activity for complete water electrolysis.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Changes or changes in other different forms cannot be exhausted here, and all obvious changes or changes derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (9)

1. A Co-Mo-P-O electrocatalyst used for electrolytic water hydrogen evolution reaction or electrolytic water oxygen evolution reaction or complete electrolytic water is characterized in that the Co-Mo-P-O electrocatalyst is an amorphous nanoparticle film loaded on a conductive substrate and comprising four elements of Co, Mo, P and O; in the Co-Mo-P-O electrocatalyst, Co, Mo, P and O are uniformly distributed in the whole film, and the surface of the film is highly rough;

the preparation method of the Co-Mo-P-O electrocatalyst comprises the following steps:

1) preparing an electrolyte aqueous solution containing cobalt sulfate, sodium molybdate, sodium hypophosphite and sodium citrate;

2) in a three-electrode electrochemical system, a conductive substrate is used as a working electrode, and a constant potential is applied to the working electrode for electrochemical deposition, so that the Co-Mo-P-O electrocatalyst is obtained.

2. The Co-Mo-P-O electrocatalyst according to claim 1, wherein the electrically conductive substrate is foamed nickel, nickel sheet or ITO glass.

3. The Co-Mo-P-O electrocatalyst according to claim 1, wherein the concentration of each component in the aqueous electrolyte solution is: 0.15 mol/L cobalt sulfate, 0.05 mol/L sodium molybdate, 0.05 mol/L-0.6 mol/L sodium hypophosphite and 0.15 mol/L sodium citrate.

4. The Co-Mo-P-O electrocatalyst according to claim 1, wherein in said three-electrode electrochemical system a platinum sheet is used as counter electrode and a saturated calomel electrode is used as reference electrode.

5. The Co-Mo-P-O electrocatalyst according to claim 1, characterized in that the constant potential is-2.0V.

6. The Co-Mo-P-O electrocatalyst according to claim 1, characterized in that the electrochemical deposition is performed at room temperature with continuous stirring by a magnetic stirrer at a stirring speed of 200-500 rpm.

7. The Co-Mo-P-O electrocatalyst according to claim 1, wherein the electrochemical deposition time is 5 minutes.

8. Use of a Co-Mo-P-O electrocatalyst according to any one of claims 1-2 in hydrogen evolution reactions by electrolysis, oxygen evolution reactions by electrolysis and complete electrolysis of water.

9. The use according to claim 8, characterized by the following aspects:

1) the Co-Mo-P-O electrocatalyst is used as a cathode for the electrolytic water hydrogen evolution reaction;

2) the Co-Mo-P-O electrocatalyst is used as an anode for the electrolytic water oxygen evolution reaction;

3) the Co-Mo-P-O electrocatalyst is used as an anode and a cathode respectively for complete water electrolysis reaction.

Images