CN115404508A - Monoatomic supported Os-WO 2.72 Electrocatalytic material, preparation method and application thereof - Google Patents

Abstract

The invention discloses a monoatomic load type Os-WO _2.72 Electrocatalytic material, a preparation method and application thereof; preparation: (1) Fully dissolving a tungsten source in an organic solvent to obtain a dissolved solution; (2) Heating the dissolved solution for reaction, washing and drying to obtain WO _2.72 (ii) a (3) Mixing WO _2.72 Dispersing in a solvent to obtain a dispersion liquid; under the ice-bath condition, adding potassium citrate and an osmium source into the dispersion liquid and stirring to obtain a mixed liquid; (4) Heating the mixed solution for reaction, washing and drying to obtain Os-WO _2.72 . The application comprises the following steps: electricity produced by the inventionThe catalytic material can be used for oxygen evolution reaction and glucose oxidation reaction. Os-WO prepared by the invention _2.72 It has low cost and high utilization rate of active sites. The single-atom supported catalytic material has low load, the dispersion degree of the active center osmium atoms on the carrier is high, so the utilization rate of the active center of the osmium atoms is high, the specific activity superior to that of a three-dimensional similar material can be realized by using less load, and the cost of the catalyst can be further reduced by using low load.

Description

A single-atom supported Os-WO2.72 electrocatalytic material and its preparation method and application

technical field

The invention relates to the technical field of single-atom-supported catalytic materials, in particular to a single-atom-supported Os-WO _2.72 electrocatalytic material and its preparation method and application.

Background technique

Single-atom catalysts are a hot research direction in the field of catalysis in recent years. As the core of single-atom catalytic materials, they can maximize the utilization of metal atom active sites and effectively reduce the cost of catalysts, so they have very important application value.

Supported single-atom catalyst refers to a supported catalyst that only contains a single atom that has no interaction with each other as the only active center. Single-atom catalysts have shown great development potential due to their integration of many advantages such as the easy separation and structural stability of heterogeneous catalysts and the "isolated sites" of homogeneous catalysts.

Glucose electrochemical oxidation reaction (GOR) to prepare organic acids has wide distribution, sustainability, non-toxicity and important industrial prospects, and the electrochemical oxidation of glucose depending on the properties of electrode materials and electrode surface structure has been attracting attention in recent years. At present, gold and platinum, as electrode materials, still have the disadvantages of being easily adsorbed by intermediate products, poor selectivity, and low sensitivity, thereby inhibiting further electrocatalytic oxidation of glucose. WO _2.72 has been proved to be a promising material for high-efficiency electrochemical applications, but WO _2.72 cannot simultaneously possess high catalytic activity and satisfactory _H2 production efficiency, while Os-WO _2.72 as a supported single-atom catalyst has comparative advantages in these aspects. Excellent performance, the osmium single atom has a huge surface free energy, the smaller the surface area of the crystal, the surface free energy will increase sharply, and the catalyst has a strong tendency to reduce its own energy. Therefore, the osmium single atom as the active center has a spontaneous tendency to strongly adsorb the substrate molecules to increase the coordination number and reduce the surface energy. This feature makes the Os-WO _2.72 single-atom-supported catalytic material have a strong adsorption and capture ability for substrate molecules, and is also an important reason for the high activity of the supported single-atom catalyst, which is expected to be used in the field of glucose fuel cells.

Contents of the invention

The purpose of the present invention is to provide a method for preparing a monoatomic Os-WO _2.72 electrocatalytic material for the defects of existing electrocatalytic materials such as platinum, gold and WO _2.72 . A method for preparing atoms supported on tungsten oxide; at the same time, the present invention uses the prepared single-atom-supported electrocatalytic material as a highly active material, which has excellent electrocatalytic performance, and can be used in the oxygen evolution reaction and glucose reaction in the electrolysis of water reaction and electrolysis of glucose reaction. The overpotential in the oxidation reaction is low.

The present invention is achieved through the following technical solutions:

A method for preparing a monoatom-supported Os-WO _2.72 electrocatalytic material, characterized in that the method comprises the following steps:

(1) According to the stoichiometric ratio, the tungsten source is fully dissolved in the organic solvent to obtain a solution;

(2) Heating and reacting the solution, washing and drying after the reaction, to obtain the carrier material of WO _2.72 ;

(3) Disperse the WO _2.72 carrier material in a solvent to obtain a dispersion; then add potassium citrate and an osmium source to the dispersion under ice bath conditions and stir evenly to obtain a mixed solution;

(4) The mixed liquid is heated for reaction, washed and dried after the reaction to obtain Os-WO _2.72 electrocatalytic material.

The single-atom supported Os-WO _2.72 electrocatalytic material prepared by the method of the invention can be used for oxygen evolution reaction (OER) and glucose oxidation reaction (GOR), and has a small overpotential and excellent electrocatalytic activity. The Os-WO _2.72 electrocatalytic material prepared in the present invention is a single-atom supported catalytic material, and the single-atom supported catalytic material often exhibits good catalytic performance in the field of electrocatalysis, especially oxygen evolution reaction (OER).

Further, a preparation method of a single-atom-supported Os-WO _2.72 electrocatalytic material: step (1) according to the stoichiometric ratio, fully dissolve the tungsten source in the organic solvent by ultrasonic and stirring to obtain a solution; wherein: the The tungsten source is tungsten hexachloride, and the organic solvent is ethanol. Preferably, the ultrasonic time is about 10 minutes, the stirring speed is 1500-2000 rpm, and the stirring time is about 0.5 hour.

Further, a method for preparing a single-atom-supported Os-WO _2.72 electrocatalytic material: the molar volume ratio of the tungsten source to the organic solvent in step (1) is 0.01-0.1 mol/L.

Further, a preparation method of a single-atom-supported Os-WO _2.72 electrocatalytic material: step (2) put the solution in a hydrothermal kettle for solvothermal reaction for 8-12 hours, and wash with water and alcohol after the reaction , and then dried at 50-60°C to obtain the carrier material of WO _2.72 ; wherein: the solvothermal temperature is 150-180°C.

Further, a method for preparing a single-atom supported Os-WO _2.72 electrocatalytic material: the molar ratio of the osmium source, the potassium citrate and the WO _2.72 carrier material in step (3) is (1-10 ):50:20.

Further, a method for preparing a single-atom-supported Os-WO _2.72 electrocatalytic material: the molar ratio of the total molar amount of the osmium source, potassium citrate and WO _2.72 carrier material to the solvent described in step (3) is 1: (1500-1800).

Further, a method for preparing a single-atom supported Os-WO _2.72 electrocatalytic material: the solvent described in step (3) is water, the osmium source is potassium chloroosmate (K ₂ OsCl ₆ ), ice The bath temperature is 0-5 °C; the stirring speed is 1000-2000 rpm.

Further, a preparation method of single-atom-supported Os-WO _2.72 electrocatalytic material: step (4) put the mixed solution in a hydrothermal kettle and react at 100-120°C for 3-6 hours. Washing with water and alcohol, and then drying at 50-60°C to obtain Os-WO _2.72 electrocatalytic material.

A monoatom-loaded Os-WO _2.72 electrocatalytic material is characterized in that it is prepared by the above-mentioned preparation method.

An application of single-atom supported Os-WO _2.72 electrocatalytic material, characterized in that the electrocatalytic material prepared by the above preparation method is used for oxygen evolution reaction and glucose oxidation reaction.

The single-atom supported Os-WO _2.72 electrocatalytic material prepared by the present invention can be used as an electrocatalytic material for oxygen evolution reaction (OER) and glucose oxidation reaction (GOR), promoting its application in commercial electrocatalysts.

Beneficial effects of the present invention:

(1) The monoatom-loaded Os-WO _2.72 electrocatalytic material prepared by the present invention has low cost and high active site utilization. The loading capacity of single-atom-supported catalytic materials is often low, and the dispersion of the active center osmium atoms on the carrier is very high, so the utilization rate of the active center of the osmium atoms is often high, and it can achieve better than three-dimensional similar materials with less loading. The specific activity and low loading can further reduce the catalyst cost.

(2) The monoatom-supported Os-WO _2.72 electrocatalytic material prepared by the present invention has high selectivity. Since the catalytic center of single-atom catalytic materials only exists as a single atom, the adsorption configuration is relatively single, and there are no multiple competing adsorption configurations. The single atom loaded on the carrier will be alloyed to a certain extent, and the coordination atoms of the carrier will change the electronic structure of the single atom to a certain extent, thereby enhancing the specific adsorption strength of the single atom in the active center; these characteristics make the reaction path single and the reaction products High selectivity.

(3) Additional value-added chemicals: traditional hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which are inherent in electrolytic water, produce O ₂ with low value, crossing with H ₂ may also cause safety in the process of industrial water splitting Hidden danger. Replacing the oxygen evolution reaction (OER) with the electrolytic oxidative glucose reaction (GOR) can reduce the input voltage for _H2 production and convert it into additional value-added chemicals. The preparation of organic acids by the glucose oxidation reaction (GOR) has broad distribution, sustainability, non-toxicity, and great industrial promise.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be 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 skilled in the art can also obtain other drawings based on these drawings without creative work.

Figure 1 is the XRD pattern of the single-atom supported Os-WO _2.72 electrocatalytic material prepared in Example 2 of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1

A method for preparing a monoatom-supported Os-WO _2.72 electrocatalytic material, comprising the following specific steps:

(1) According to the stoichiometric ratio, tungsten hexachloride was ultrasonicated for 10 minutes, then stirred at a stirring speed of 1500rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume of tungsten hexachloride and ethanol The ratio is 0.05mol/L;

(2) Transfer the dissolving solution into a hydrothermal kettle, place the hydrothermal kettle in an oven for solvothermal reaction for 10 hours, wash with water and alcohol after the reaction, and then dry in an oven at 50°C for 1 hour to obtain WO _2.72 carrier material; wherein: the solvothermal temperature is 160°C;

(3) Disperse the WO _2.72 carrier material in water to obtain a dispersion; then add potassium citrate and potassium chloroosmate (K ₂ OsCl ₆ ) to the dispersion in an ice bath at 5°C and Stir at a rate of 1000rpm for 0.5 hours to obtain a mixed solution; wherein: the molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 is 1:10:4; the total molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 carrier material The molar ratio of water to water is 1:1600;

(4) Put the above mixed solution in a hydrothermal kettle to react at 120°C for 5 hours, wash with water and alcohol after the reaction, and then dry at 60°C for 1 hour to obtain the monoatom-loaded Os-WO _2.72 electrode catalytic material.

application:

The single-atom-loaded Os-WO _2.72 electrocatalytic material prepared in Example 1 above was used for glucose oxidation reaction, and the process was as follows:

(1) Configure Nafion resin: water: ethanol with a volume ratio of 1:2:7 mixed solution A, take 1.0 mg of the prepared monoatom-loaded Os-WO _2.72 electrocatalytic material and ultrasonically disperse it in 100 μL of mixed solution A (Ultrasonic time is 15 minutes, ultrasonic temperature is 25°C, ultrasonic power is 800W), and mixed solution B is obtained;

(2) Take 10 μL of the mixed solution B and drop it on the glassy carbon electrode, and dry it naturally to obtain the electrocatalyst;

(3) The oxygen evolution reaction (OER) performance was measured under 1M KOH, and the oxygen evolution overpotential was 341mV at a current density of 10mA cm ^-2 ; the glucose oxidation reaction (GOR) was measured under 1M KOH and 0.1M glucose electrolyte Performance, the overpotential of oxidizing glucose at a current density of 10mA·cm ^-2 is only 304mV, it is obvious that the electrocatalyst used in GOR is beneficial to energy-saving hydrogen production.

Example 2

A method for preparing a monoatom-supported Os-WO _2.72 electrocatalytic material, comprising the following specific steps:

(1) According to the stoichiometric ratio, tungsten hexachloride is ultrasonicated for 15 minutes, then stirred at a stirring speed of 1000rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume of tungsten hexachloride and ethanol The ratio is 0.03mol/L;

(2) Transfer the dissolving solution into a hydrothermal kettle, place the hydrothermal kettle in an oven for solvothermal reaction for 9 hours, wash with water and alcohol after the reaction, then dry in an oven at 55° C. for 1 hour to obtain WO _2.72 carrier material; wherein: the solvothermal temperature is 160°C;

(3) Disperse the WO _2.72 carrier material in water to obtain a dispersion; then add potassium citrate and potassium chloroosmate (K ₂ OsCl ₆ ) to the dispersion in an ice bath at 3°C and Stir at a rate of 1500rpm for 0.5 hours to obtain a mixed solution; wherein: the molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 is 1:5:2; the total molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 carrier material The molar ratio of water to water is 1:1500;

(4) Put the above mixed solution in a hydrothermal kettle to react at 110°C for 6 hours, wash with water and alcohol after the reaction, and then dry at 60°C for 1 hour to obtain the monoatom-loaded Os-WO _2.72 electrode catalytic material.

application:

The single-atom-supported Os-WO _2.72 electrocatalytic material prepared in Example 2 above was used in the glucose oxidation reaction, and the process was as follows:

(1) Configure Nafion resin: water: ethanol with a volume ratio of 1:2:7 mixed solution A, take 1.5 mg of the prepared monoatom-loaded Os-WO _2.72 electrocatalytic material and ultrasonically disperse it in 150 μL of mixed solution A (Ultrasonic time is 15 minutes, ultrasonic temperature is 25°C, ultrasonic power is 800W), and mixed solution B is obtained;

(2) Take 10 μL of the mixed solution B and drop it on the glassy carbon electrode, and dry it naturally to obtain the electrocatalyst;

(3) The oxygen evolution reaction (OER) performance was measured under 1M KOH, and the oxygen evolution overpotential was 309mV at a current density of 10mA cm ^-2 ; the glucose oxidation reaction (GOR) was measured under 1M KOH and 0.1M glucose electrolyte Performance, the overpotential of oxidizing glucose at a current density of 10mA·cm ^-2 is only 281mV, it is obvious that the electrocatalyst used in GOR is beneficial to energy-saving hydrogen production.

X-ray diffraction was performed on the single-atom-supported Os-WO _2.72 electrocatalytic material prepared in Example 2 above. The results are shown in Figure 1. It can be seen from Figure 1 that the XRD peak shape is consistent with the standard card PDF#05-0392 , which proves that the substrate is indeed WO _2.72 , and there is no peak of elemental osmium, indicating that the osmium and the substrate WO _2.72 form a coordination structure, and there is no Os-Os bond, which means that Os-WO _2.72 is a single-atom structure.

Example 3

A method for preparing a monoatom-supported Os-WO _2.72 electrocatalytic material, comprising the following specific steps:

(1) According to the stoichiometric ratio, tungsten hexachloride is ultrasonicated for 15 minutes, then stirred at a stirring speed of 2000rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume of tungsten hexachloride and ethanol The ratio is 0.03mol/L;

(2) Transfer the solution into a hydrothermal kettle, place the hydrothermal kettle in an oven for solvothermal reaction for 11 hours, wash with water and alcohol after the reaction, and then dry in an oven at 60°C for 1 hour to obtain WO _2.72 carrier material; wherein: the solvothermal temperature is 160°C;

(3) Disperse the WO _2.72 carrier material in water to obtain a dispersion; then add potassium citrate and potassium chloroosmate (K ₂ OsCl ₆ ) to the dispersion in an ice bath at 0°C and Stir at a rate of 2000rpm for 0.5 hours to obtain a mixed solution; wherein: the molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 is 1:50:20; the total molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 carrier material The molar ratio of water to water is 1:1800;

(4) Put the above mixed solution in a hydrothermal kettle to react at 100°C for 6 hours, wash with water and alcohol after the reaction, and then dry at 50°C for 1 hour to obtain the monoatom-loaded Os-WO _2.72 electrode catalytic material.

application:

The single-atom supported Os-WO _2.72 electrocatalytic material prepared in Example 3 above was used for glucose oxidation reaction, and the process was as follows:

(1) Configure Nafion resin: water: ethanol with a volume ratio of 1:2:7 mixed solution A, take 2.0 mg of the prepared single-atom-loaded Os-WO _2.72 electrocatalytic material and ultrasonically disperse it in 200 μL of mixed solution A (Ultrasonic time is 20 minutes, ultrasonic temperature is 25°C, ultrasonic power is 1000W), and mixed solution B is obtained;

(2) Take 10 μL of the mixed solution B and drop it on the glassy carbon electrode, and dry it naturally to obtain the electrocatalyst;

(3) The oxygen evolution reaction (OER) performance was measured under 1M KOH, and the oxygen evolution overpotential was 389mV at a current density of 10mA cm ^-2 ; the glucose oxidation reaction (GOR) was measured under 1M KOH and 0.1M glucose electrolyte Performance, the overpotential of oxidizing glucose at a current density of 10mA·cm ^-2 is only 336mV, it is obvious that the electrocatalyst used in GOR is beneficial to energy-saving hydrogen production.

Example 4

A method for preparing a monoatom-supported Os-WO _2.72 electrocatalytic material, comprising the following specific steps:

(1) According to the stoichiometric ratio, tungsten hexachloride was ultrasonicated for 10 minutes, then stirred at a stirring speed of 2000rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume of tungsten hexachloride and ethanol The ratio is 0.08mol/L;

(2) Transfer the dissolving solution into a hydrothermal kettle, place the hydrothermal kettle in an oven for solvothermal reaction for 11 hours, wash with water and alcohol after the reaction, then dry in an oven at 55° C. for 1 hour to obtain WO _2.72 carrier material; wherein: the solvothermal temperature is 160°C;

(3) Disperse the WO _2.72 carrier material in water to obtain a dispersion; then add potassium citrate and potassium chloroosmate (K ₂ OsCl ₆ ) to the dispersion in an ice bath at 0°C and Stir at a rate of 2000rpm for 0.5 hours to obtain a mixed solution; wherein: the molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 is 1:10:4; the total molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 carrier material The molar ratio of water to water is 1:1700;

(4) Put the above mixed solution in a hydrothermal kettle to react at 120°C for 4 hours, wash with water and alcohol after the reaction, and then dry at 50°C for 1 hour to obtain the monoatom-loaded Os-WO _2.72 electrode catalytic material.

application:

The single-atom-supported Os-WO _2.72 electrocatalytic material prepared in Example 4 above was used in the glucose oxidation reaction, and the process was as follows:

(1) Configure Nafion resin: water: ethanol with a volume ratio of 1:2:7 mixed solution A, take 2.0 mg of the prepared single-atom-loaded Os-WO _2.72 electrocatalytic material and ultrasonically disperse it in 200 μL of mixed solution A (Ultrasonic time is 20 minutes, ultrasonic temperature is 25°C, ultrasonic power is 1000W), and mixed solution B is obtained;

(2) Take 10 μL of the mixed solution B and drop it on the glassy carbon electrode, and dry it naturally to obtain the electrocatalyst;

(3) The oxygen evolution reaction (OER) performance was measured under 1M KOH, and the oxygen evolution overpotential was 339mV at a current density of 10mA cm ^-2 ; the glucose oxidation reaction (GOR) was measured under 1M KOH and 0.1M glucose electrolyte Performance, the overpotential of glucose oxidation at a current density of 10mA·cm ^-2 is only 292mV, it is obvious that the electrocatalyst used in GOR is beneficial to energy-saving hydrogen production.

Example 5

A method for preparing a monoatom-supported Os-WO _2.72 electrocatalytic material, comprising the following specific steps:

(1) According to the stoichiometric ratio, tungsten hexachloride was ultrasonicated for 10 minutes, then stirred at a stirring speed of 2000rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume of tungsten hexachloride and ethanol The ratio is 0.03mol/L;

(2) Transfer the dissolving solution into a hydrothermal kettle, place the hydrothermal kettle in an oven for solvothermal reaction for 12 hours, wash with water and alcohol after the reaction, then dry in an oven at 50° C. for 1 hour to obtain WO _2.72 carrier material; wherein: the solvothermal temperature is 160°C;

(3) Disperse the WO _2.72 carrier material in water to obtain a dispersion; then add potassium citrate and potassium chloroosmate (K ₂ OsCl ₆ ) to the dispersion in an ice bath at 0°C and Stir at a rate of 1500rpm for 0.5 hours to obtain a mixed solution; wherein: the molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 is 1:10:5; the total molar ratio of potassium chloroosmate, potassium citrate and WO _2.72 carrier material The molar ratio of water to water is 1:1600;

(4) Put the above mixed solution in a hydrothermal kettle to react at 110°C for 5 hours, wash with water and alcohol after reaction, and then dry at 55°C for 1 hour to obtain the monoatom-loaded Os-WO _2.72 electrode catalytic material.

application:

The single-atom-supported Os-WO _2.72 electrocatalytic material prepared in Example 5 above was used in the glucose oxidation reaction, and the process was as follows:

(1) Configure Nafion resin: water: ethanol with a volume ratio of 1:2:7 mixed solution A, take 2.5 mg of the prepared single-atom-loaded Os-WO _2.72 electrocatalytic material and ultrasonically disperse it in 250 μL of mixed solution A (Ultrasonic time is 15 minutes, ultrasonic temperature is 25°C, ultrasonic power is 1000W), and mixed solution B is obtained;

(2) Take 10 μL of the mixed solution B and drop it on the glassy carbon electrode, and dry it naturally to obtain the electrocatalyst;

(3) The oxygen evolution reaction (OER) performance was measured under 1M KOH, and the oxygen evolution overpotential was 341mV at a current density of 10mA cm ^-2 ; the glucose oxidation reaction (GOR) was measured under 1M KOH and 0.1M glucose electrolyte Performance, the overpotential of glucose oxidation at a current density of 10mA·cm ^-2 is only 298mV, it is obvious that the electrocatalyst used in GOR is beneficial to energy-saving hydrogen production.

The single-atom supported Os-WO _2.72 electrocatalytic material obtained in the above Examples 1-5 was made into an electrocatalyst, and the OER and GOR performance of the catalytic material was detected at an electrochemical workstation. The detection conditions were room temperature, and the OER electrolyte was 1.0M KOH. The GOR electrolyte is a mixed solution of 1.0M KOH and 0.1M glucose. The comprehensive results are shown in Table 1. The following results are all overpotentials when the current density reaches 10mA·cm ^-2 .

Table 1 is the OER and GOR performance of the material obtained in embodiment 1-5 as catalyst

It can be seen from Table 1 that adding a small amount of glucose as a promoter to replace OER is more conducive to thermodynamic electro-oxidation and also helps to reduce the voltage for efficient _H2 production; because highly active osmium single atoms that have no interaction with each other As the only active center, which is different from simple chemical bonds, the single-atom-supported Os-WO _2.72 electrocatalytic material exhibits excellent selectivity and is suitable for the glucose oxidation reaction (GOR) with added glucose, so that GOR has a higher ratio than OER lower overpotential.

The above-mentioned preferred embodiments of the present invention are only used to explain the present invention, and are not intended to limit the present invention. 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 (10)

1. Monoatomic supported Os-WO _2.72 A method of preparing an electrocatalytic material, the method comprising the steps of:

(1) Fully dissolving a tungsten source in an organic solvent according to a stoichiometric ratio to obtain a dissolved solution;

(2) Heating the solution for reaction, washing and drying after the reaction to obtain WO _2.72 A carrier material;

(3) Subjecting said WO to _2.72 Dispersing a carrier material in a solvent to obtain a dispersion liquid; then under the ice-bath condition, adding potassium citrate and an osmium source into the dispersion liquid and uniformly stirring to obtain a mixed liquid;

(4) Heating the mixed solution for reaction, washing and drying after the reaction to obtain Os-WO _2.72 An electrocatalytic material.

2. A monatomic supported Os-WO according to claim 1 _2.72 The preparation method of the electrocatalytic material is characterized in that, in the step (1), a tungsten source is fully dissolved in an organic solvent by ultrasonic and stirring according to a stoichiometric ratio to obtain a solution; wherein: the tungsten source is tungsten hexachloride, and the organic solvent is ethanol.

3. A monoatomic supported Os-WO according to claim 1 or 2 _2.72 The preparation method of the electrocatalytic material is characterized in that the molar volume ratio of the tungsten source to the organic solvent in the step (1) is 0.01-0.1mol/L.

4. A monatomic supported Os-WO according to claim 1 _2.72 The preparation method of the electrocatalytic material is characterized in that the solution is placed in a hydrothermal kettle in the step (2) for solvothermal reaction for 8 to 12 hours, and after the reaction, the obtained product is washed by water and alcohol and then dried at 50 to 60 ℃ to obtain WO _2.72 A carrier material; wherein: the solvent heating temperature is 150-180 ℃.

5. A monatomic supported Os-WO according to claim 1 _2.72 The method for preparing the electrocatalytic material is characterized in that the osmium source, the potassium citrate and the WO in the step (3) _2.72 The molar ratio of the support material is (1-10): 50:20.

6. according to the claims2A monoatomic supported Os-WO as defined in claim 1 _2.72 The preparation method of the electrocatalytic material is characterized in that in the step (3), the osmium source, potassium citrate and WO are adopted _2.72 The molar ratio of the total amount of moles of support material to the solvent is 1: (1500-1800).

7. A monatomic supported Os-WO according to claim 1 _2.72 The preparation method of the electrocatalytic material is characterized in that the solvent in the step (3) is water, the osmium source is potassium chloroosmate, and the ice bath temperature is 0-5 ℃; the stirring speed is 1000-2000rpm.

8. A monatomic supported Os-WO according to claim 1 _2.72 The preparation method of the electrocatalytic material is characterized in that the mixed solution is placed in a hydrothermal kettle to react for 3-6 hours at the temperature of 100-120 ℃, and after the reaction, the mixed solution is washed by water and alcohol and then dried at the temperature of 50-60 ℃ to obtain Os-WO _2.72 An electrocatalytic material.

9. Monoatomic supported Os-WO _2.72 Electrocatalytic material, characterized in that it is obtained by the process according to any one of claims 1 to 8.

10. Monoatomic supported Os-WO _2.72 Use of an electrocatalytic material prepared by the preparation method according to any one of claims 1 to 8 for oxygen evolution reactions and glucose oxidation reactions.

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