A single-atom supported Os-WO 2.72 Electrocatalytic material and its preparation method and application

Abstract

The present invention discloses a single-atom-loaded Os-WO 2.72 Electrocatalytic material and preparation method and application thereof; Preparation: (1) fully dissolving a tungsten source in an organic solvent to obtain a solution; (2) heating the solution for reaction, washing, and drying to obtain WO 2.72 ;(3) Will WO 2.72 Disperse in a solvent to obtain a dispersion; add potassium citrate and an osmium source to the dispersion under ice bath conditions and stir to obtain a mixed solution; (4) heat the mixed solution for reaction, wash, and dry to obtain Os-WO 2.72 Application: The electrocatalytic material prepared by the present invention can be used for oxygen evolution reaction and glucose oxidation reaction. 2.72 It has low cost and high utilization rate of active sites. The loading amount 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 atom is often very high. With a smaller loading amount, it can achieve a better specific activity than similar three-dimensional materials. Low loading amount can further reduce the cost of the catalyst.

Description

Technical Field

[0001] The present invention relates to the technical field of single-atom supported catalytic materials, and in particular to a single-atom supported Os-WO 2.72 Electrocatalytic materials and their preparation methods and applications. Background Art

[0002] Single-atom catalysts have been a hot research direction in the field of catalysis in recent years. The single-atom catalytic materials at their core have very important application value because they can maximize the utilization of metal atom active sites and effectively reduce catalyst costs.

[0003] Supported single-atom catalysts refer to supported catalysts that contain only single atoms that have no interaction with each other as the only active center. Single-atom catalysts have shown great development potential because they integrate many advantages of heterogeneous catalysts, such as easy separation and structural stability, and the "isolated sites" of homogeneous catalysts.

[0004] Glucose electrochemical oxidation reaction (GOR) to prepare organic acids has wide distribution, sustainability, non-toxicity and important industrial prospects. In recent years, the electrochemical oxidation of glucose has been attracting attention due to the properties of electrode materials and electrode surface structure. At present, gold and platinum as electrode materials still have the disadvantages of being easily adsorbed by intermediates, poor selectivity and low sensitivity, thereby inhibiting further glucose electrocatalytic oxidation. 2.72 It has been shown to be a promising material for efficient electrochemical applications, but WO 2.72 It cannot have both high catalytic activity and satisfactory H2 production efficiency, while Os-WO 2.72 As a supported single-atom catalyst, it has excellent performance in these aspects. Osmium single atoms have extremely large surface free energy. The smaller the surface area of ​​the crystal, the more rapidly the surface free energy increases, and the catalyst has a strong tendency to reduce its own energy. Therefore, as the active center, the osmium single atom has a strong spontaneous tendency to adsorb substrate molecules to increase the coordination number and reduce the surface energy. This characteristic makes Os-WO 2.72 Single-atom supported catalytic materials have strong adsorption and capture capabilities for substrate molecules, which is also an important reason why supported single-atom catalysts have high activity and are expected to be used in the field of glucose fuel cells. Summary of the invention

[0005] The purpose of the present invention is to improve the existing platinum, gold and WO 2.72 The defects of electrocatalytic materials such as Os-WO are eliminated, and a single-atom Os-WO 2.72The invention discloses a method for preparing an electrocatalytic material. The method of the invention is a method for preparing an osmium single atom by loading it on tungsten oxide. At the same time, the invention uses the prepared single atom loaded electrocatalytic material as a highly active substance, which has excellent electrocatalytic performance, and has a low overpotential in the oxygen evolution reaction and the glucose oxidation reaction in the water electrolysis reaction and the glucose electrolysis reaction.

[0006] The present invention is achieved through the following technical solutions:

[0007] A single atom-supported Os-WO 2.72 A method for preparing an electrocatalytic material, characterized in that the method comprises the following steps:

[0008] (1) fully dissolving a tungsten source in an organic solvent according to a stoichiometric ratio to obtain a solution;

[0009] (2) heating the solution to react, washing and drying after the reaction to obtain WO 2.72 Carrier material;

[0010] (3) The WO 2.72 The carrier material is dispersed in a solvent to obtain a dispersion; then potassium citrate and an osmium source are added to the dispersion under ice bath conditions and stirred uniformly to obtain a mixed solution;

[0011] (4) heating the mixed solution for reaction, washing and drying after the reaction to obtain Os-WO 2.72 Electrocatalytic materials.

[0012] Single atom supported Os-WO prepared by the method of the present invention 2.72 Electrocatalytic materials can be used for oxygen evolution reaction (OER) and glucose oxidation reaction (GOR), and have small overpotential and excellent electrocatalytic activity. 2.72 Electrocatalytic materials are single-atom supported catalytic materials, which often exhibit good catalytic performance in the field of electrocatalysis, especially in the oxygen evolution reaction (OER).

[0013] Furthermore, a single-atom-supported Os-WO 2.72 Preparation method of electrocatalytic material: step (1) dissolving a tungsten source in an organic solvent by ultrasonication and stirring according to a stoichiometric ratio to obtain a solution; wherein the tungsten source is tungsten hexachloride and the organic solvent is ethanol. Preferably, the ultrasonication time is about 10 minutes, the stirring speed is 1500-2000 rpm, and the stirring time is about 0.5 hours.

[0014] Furthermore, a single-atom-supported Os-WO 2.72Preparation method of electrocatalytic material: the molar volume ratio of the tungsten source to the organic solvent in step (1) is 0.01-0.1 mol / L.

[0015] Furthermore, a single-atom-supported Os-WO 2.72 Preparation method of electrocatalytic material: Step (2) placing the solution in a hydrothermal kettle for solvent thermal reaction for 8-12 hours, washing with water and alcohol after the reaction, and then drying at 50-60°C to obtain WO 2.72 Carrier material; wherein: the solvent thermal temperature is 150-180°C.

[0016] Furthermore, a single-atom-supported Os-WO 2.72 Preparation method of electrocatalytic material: the osmium source, the potassium citrate and the WO in step (3) 2.72 The molar ratio of the carrier material is (1-10):50:20.

[0017] Furthermore, a single-atom-supported Os-WO 2.72 Preparation method of electrocatalytic material: the osmium source, potassium citrate and WO in step (3) are 2.72 The molar ratio of the total molar amount of the carrier material to the solvent is 1:(1500-1800).

[0018] Furthermore, a single-atom-supported Os-WO 2.72 Preparation method of electrocatalytic material: the solvent described in step (3) is water, the osmium source is potassium chloroosmate (K2OsCl6), the ice bath temperature is 0-5°C; the stirring speed is 1000-2000rpm.

[0019] Furthermore, a single-atom-supported Os-WO 2.72 Preparation method of electrocatalytic material: Step (4) placing the mixed solution in a hydrothermal kettle and reacting at 100-120°C for 3-6 hours, washing with water and alcohol after the reaction, and then drying at 50-60°C to obtain Os-WO 2.72 Electrocatalytic materials.

[0020] A single atom-supported Os-WO 2.72 The electrocatalytic material is characterized in that it is prepared by the above-mentioned preparation method.

[0021] A single atom-supported Os-WO 2.72 The application of the electrocatalytic material is characterized in that the electrocatalytic material prepared by the above preparation method is used for oxygen evolution reaction and glucose oxidation reaction.

[0022] Single atom supported Os-WO prepared by the present invention 2.72The electrocatalytic materials can be used as electrocatalytic materials for oxygen evolution reaction (OER) and glucose oxidation reaction (GOR), promoting their application in commercial electrocatalysts.

[0023] Beneficial effects of the present invention:

[0024] (1) Single-atom supported Os-WO prepared by the present invention 2.72 Electrocatalytic materials have low cost and high utilization rate of active sites. The loading amount 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 atom is often very high. With a small loading amount, it can achieve a specific activity that is better than that of similar three-dimensional materials. Low loading amount can further reduce the cost of the catalyst.

[0025] (2) Single-atom supported Os-WO prepared by the present invention 2.72 Electrocatalytic materials have high selectivity. Single-atom catalytic materials have a single adsorption configuration because the catalytic center is only a single atom, and there are no multiple competing adsorption configurations. Single atoms loaded on a carrier will alloy to a certain extent, and the carrier-coordinated atoms 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 its reaction path single and the reaction product selectivity high.

[0026] (3) Additional value-added chemicals: The inherent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) of conventional water electrolysis produce O2 of low value, and cross-reaction with H2 may also pose a safety hazard in the industrial water splitting process. Replacing the oxygen evolution reaction (OER) with the electrolytic glucose oxidation reaction (GOR) can reduce the input voltage for H2 production and convert it into additional value-added chemicals. The preparation of organic acids by glucose oxidation reaction (GOR) has wide distribution, sustainability, non-toxicity and important industrial prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The single-atom supported Os-WO prepared in Example 2 of the present invention 2.72 XRD patterns of electrocatalytic materials. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] A single-atom supported Os-WO 2.72 The method for preparing the electrocatalytic material comprises the following specific steps:

[0032] (1) According to the stoichiometric ratio, tungsten hexachloride is subjected to ultrasonic treatment for 10 minutes, and then stirred at a stirring speed of 1500 rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume ratio of tungsten hexachloride to ethanol is 0.05 mol / L;

[0033] (2) The solution was transferred into a hydrothermal kettle, and the hydrothermal kettle was placed in an oven for solvent thermal reaction for 10 hours. After the reaction, it was washed with water and alcohol, and then dried in an oven at 50° C. for 1 hour to obtain WO 2.72 Carrier material; wherein: the solvent thermal temperature is 160°C;

[0034] (3) The WO 2.72 The carrier material is dispersed in water to obtain a dispersion; then potassium citrate and potassium chloroosmate (K2OsCl6) are added to the dispersion under an ice bath condition of 5°C and stirred at a rate of 1000 rpm for 0.5 hours to obtain a mixed solution; wherein: potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of the total amount of carrier material to water is 1:1600;

[0035] (4) The mixed solution was placed in a hydrothermal reactor and reacted at 120°C for 5 hours. After the reaction, it was washed with water and alcohol, and then dried at 60°C for 1 hour to obtain a single-atom supported Os-WO 2.72 Electrocatalytic materials.

[0036] application:

[0037] The single-atom supported Os-WO prepared in Example 1 was 2.72 The electrocatalytic material is used for glucose oxidation reaction, and the process is as follows:

[0038] (1) Prepare a mixed solution A with a volume ratio of Nafion resin, water and ethanol of 1:2:7, take 1.0 mg of the prepared single-atom supported Os-WO 2.72 The electrocatalytic material was ultrasonically dispersed in 100 μL of mixed solution A (ultrasonic time 15 min, ultrasonic temperature 25° C., ultrasonic power 800 W) to obtain mixed solution B;

[0039] (2) 10 μL of mixed solution B was dropped onto the glassy carbon electrode and dried naturally to obtain an electrocatalyst;

[0040] (3) OER performance was measured under 1 M KOH, 10 mA cm -2 The oxygen evolution overpotential is 341 mV at a current density of 10 mA cm. The glucose oxidation reaction (GOR) performance is measured in 1 M KOH and 0.1 M glucose electrolyte. -2 The overpotential of glucose oxidation is only 304 mV, which shows that the electrocatalyst can be used for GOR to achieve energy-saving hydrogen production.

[0041] Example 2

[0042] A single atom-supported Os-WO 2.72 The method for preparing the electrocatalytic material comprises the following specific steps:

[0043] (1) According to the stoichiometric ratio, tungsten hexachloride was subjected to ultrasonic treatment for 15 minutes, and then stirred at a stirring speed of 1000 rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume ratio of tungsten hexachloride to ethanol is 0.03 mol / L;

[0044] (2) The solution was transferred into a hydrothermal kettle, and the hydrothermal kettle was placed in an oven for solvent thermal reaction for 9 hours. After the reaction, it was washed with water and alcohol, and then dried in an oven at 55° C. for 1 hour to obtain WO 2.72 Carrier material; wherein: the solvent thermal temperature is 160°C;

[0045] (3) The WO 2.72 The carrier material is dispersed in water to obtain a dispersion; then potassium citrate and potassium chloroosmate (K2OsCl6) are added to the dispersion under an ice bath condition of 3°C and stirred at a rate of 1500 rpm for 0.5 hours to obtain a mixed solution; wherein: potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of the total amount of carrier material to water is 1:1500;

[0046] (4) The mixed solution was placed in a hydrothermal reactor and reacted at 110°C for 6 hours. After the reaction, it was washed with water and alcohol, and then dried at 60°C for 1 hour to obtain a single-atom supported Os-WO 2.72 Electrocatalytic materials.

[0047] application:

[0048] The single-atom supported Os-WO prepared in Example 2 was 2.72 The electrocatalytic material is used for glucose oxidation reaction, and the process is as follows:

[0049] (1) Prepare a mixed solution A with a volume ratio of Nafion resin, water and ethanol of 1:2:7, take 1.5 mg of the prepared single-atom supported Os-WO 2.72 The electrocatalytic material was ultrasonically dispersed in 150 μL of mixed solution A (ultrasonic time 15 min, ultrasonic temperature 25° C., ultrasonic power 800 W) to obtain mixed solution B;

[0050] (2) 10 μL of mixed solution B was dropped onto the glassy carbon electrode and dried naturally to obtain an electrocatalyst;

[0051] (3) OER performance was measured under 1 M KOH, 10 mA cm -2 The oxygen evolution overpotential is 309 mV at a current density of 10 mA cm. The glucose oxidation reaction (GOR) performance is measured in 1 M KOH and 0.1 M glucose electrolyte. -2 The overpotential of glucose oxidation is only 281 mV, which shows that the electrocatalyst can be used for GOR to achieve energy-saving hydrogen production.

[0052] The single-atom supported Os-WO prepared in Example 2 2.72 The electrocatalytic material was subjected to X-ray diffraction, and the results were as follows Figure 1 As shown, from Figure 1 It can be seen that the XRD peak shape is consistent with the standard card PDF#05-0392, proving that the substrate is indeed WO 2.72 , there is no peak of elemental osmium, indicating that the osmium in it is bound to the substrate WO 2.72 The coordination structure is formed, and there is no Os-Os bond, which means that Os-WO 2.72 It is a single-atom structure.

[0053] Example 3

[0054] A single-atom supported Os-WO 2.72 The method for preparing the electrocatalytic material comprises the following specific steps:

[0055] (1) According to the stoichiometric ratio, tungsten hexachloride is subjected to ultrasonic treatment for 15 minutes, and then stirred at a stirring speed of 2000 rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume ratio of tungsten hexachloride to ethanol is 0.03 mol / L;

[0056] (2) The solution was transferred into a hydrothermal kettle, and the hydrothermal kettle was placed in an oven for solvent thermal reaction for 11 hours. After the reaction, it was washed with water and alcohol, and then dried in an oven at 60° C. for 1 hour to obtain WO 2.72 Carrier material; wherein: the solvent thermal temperature is 160°C;

[0057] (3) The WO 2.72 The carrier material is dispersed in water to obtain a dispersion; then potassium citrate and potassium chloroosmate (K2OsCl6) are added to the dispersion under an ice bath condition of 0°C and stirred at a rate of 2000 rpm for 0.5 hours to obtain a mixed solution; wherein: potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of the total amount of carrier material to water is 1:1800;

[0058] (4) The mixed solution was placed in a hydrothermal reactor and reacted at 100°C for 6 hours. After the reaction, it was washed with water and alcohol, and then dried at 50°C for 1 hour to obtain a single-atom supported Os-WO 2.72 Electrocatalytic materials.

[0059] application:

[0060] The single-atom supported Os-WO prepared in Example 3 was 2.72 The electrocatalytic material is used for glucose oxidation reaction, and the process is as follows:

[0061] (1) Prepare a mixed solution A with a volume ratio of Nafion resin, water and ethanol of 1:2:7, take 2.0 mg of the prepared single-atom supported Os-WO 2.72 The electrocatalytic material was ultrasonically dispersed in 200 μL of mixed solution A (ultrasonic time 20 min, ultrasonic temperature 25° C., ultrasonic power 1000 W) to obtain mixed solution B;

[0062] (2) 10 μL of mixed solution B was dropped onto the glassy carbon electrode and dried naturally to obtain an electrocatalyst;

[0063] (3) OER performance was measured under 1 M KOH, 10 mA cm -2 The oxygen evolution overpotential is 389 mV at a current density of 10 mA cm. The glucose oxidation reaction (GOR) performance is measured in 1 M KOH and 0.1 M glucose electrolyte.-2 The overpotential of glucose oxidation is only 336 mV, which shows that the electrocatalyst can be used for GOR to achieve energy-saving hydrogen production.

[0064] Example 4

[0065] A single atom-supported Os-WO 2.72 The method for preparing the electrocatalytic material comprises the following specific steps:

[0066] (1) According to the stoichiometric ratio, tungsten hexachloride is subjected to ultrasonic treatment for 10 minutes, and then stirred at a stirring speed of 2000 rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume ratio of tungsten hexachloride to ethanol is 0.08 mol / L;

[0067] (2) The solution was transferred into a hydrothermal kettle, and the hydrothermal kettle was placed in an oven for solvent thermal reaction for 11 hours. After the reaction, it was washed with water and alcohol, and then dried in an oven at 55° C. for 1 hour to obtain WO 2.72 Carrier material; wherein: the solvent thermal temperature is 160°C;

[0068] (3) The WO 2.72 The carrier material is dispersed in water to obtain a dispersion; then potassium citrate and potassium chloroosmate (K2OsCl6) are added to the dispersion under an ice bath condition of 0°C and stirred at a rate of 2000 rpm for 0.5 hours to obtain a mixed solution; wherein: potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of the total amount of carrier material to water is 1:1700;

[0069] (4) The mixed solution was placed in a hydrothermal reactor and reacted at 120°C for 4 hours. After the reaction, it was washed with water and alcohol, and then dried at 50°C for 1 hour to obtain a single-atom supported Os-WO 2.72 Electrocatalytic materials.

[0070] application:

[0071] The single-atom supported Os-WO prepared in Example 4 was 2.72 The electrocatalytic material is used for glucose oxidation reaction, and the process is as follows:

[0072] (1) Prepare a mixed solution A with a volume ratio of Nafion resin, water and ethanol of 1:2:7, take 2.0 mg of the prepared single-atom supported Os-WO 2.72 The electrocatalytic material was ultrasonically dispersed in 200 μL of mixed solution A (ultrasonic time 20 min, ultrasonic temperature 25° C., ultrasonic power 1000 W) to obtain mixed solution B;

[0073] (2) 10 μL of mixed solution B was dropped onto the glassy carbon electrode and dried naturally to obtain an electrocatalyst;

[0074] (3) OER performance was measured under 1 M KOH, 10 mA cm -2 The oxygen evolution overpotential is 339 mV at a current density of 10 mA cm. The glucose oxidation reaction (GOR) performance is measured in 1 M KOH and 0.1 M glucose electrolyte. -2 The overpotential of glucose oxidation is only 292 mV, which shows that the electrocatalyst can be used for GOR to achieve energy-saving hydrogen production.

[0075] Example 5

[0076] A single-atom supported Os-WO 2.72 The method for preparing the electrocatalytic material comprises the following specific steps:

[0077] (1) According to the stoichiometric ratio, tungsten hexachloride is subjected to ultrasonic treatment for 10 minutes, and then stirred at a stirring speed of 2000 rpm for 0.5 hours to fully dissolve it in ethanol to obtain a solution; wherein: the molar volume ratio of tungsten hexachloride to ethanol is 0.03 mol / L;

[0078] (2) The solution was transferred into a hydrothermal kettle, and the hydrothermal kettle was placed in an oven for solvent thermal reaction for 12 hours. After the reaction, it was washed with water and alcohol, and then dried in an oven at 50° C. for 1 hour to obtain WO 2.72 Carrier material; wherein: the solvent thermal temperature is 160°C;

[0079] (3) The WO 2.72 The carrier material is dispersed in water to obtain a dispersion; then potassium citrate and potassium chloroosmate (K2OsCl6) are added to the dispersion under an ice bath condition of 0°C and stirred at a rate of 1500 rpm for 0.5 hours to obtain a mixed solution; wherein: potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of potassium chloroosmate, potassium citrate and WO 2.72 The molar ratio of the total amount of carrier material to water is 1:1600;

[0080] (4) The mixed solution was placed in a hydrothermal reactor and reacted at 110°C for 5 hours. After the reaction, it was washed with water and alcohol, and then dried at 55°C for 1 hour to obtain a single-atom supported Os-WO 2.72 Electrocatalytic materials.

[0081] application:

[0082] The single-atom supported Os-WO prepared in Example 5 was 2.72 The electrocatalytic material is used for glucose oxidation reaction, and the process is as follows:

[0083] (1) Prepare a mixed solution A with a volume ratio of Nafion resin, water and ethanol of 1:2:7, take 2.5 mg of the prepared single-atom supported Os-WO 2.72 The electrocatalytic material was ultrasonically dispersed in 250 μL of mixed solution A (ultrasonic time 15 min, ultrasonic temperature 25° C., ultrasonic power 1000 W) to obtain mixed solution B;

[0084] (2) 10 μL of mixed solution B was dropped onto the glassy carbon electrode and dried naturally to obtain an electrocatalyst;

[0085] (3) OER performance was measured under 1 M KOH, 10 mA cm -2 The oxygen evolution overpotential is 341 mV at a current density of 10 mA cm. The glucose oxidation reaction (GOR) performance is measured in 1 M KOH and 0.1 M glucose electrolyte. -2 The overpotential of glucose oxidation is only 298 mV, which shows that the electrocatalyst can be used for GOR to achieve energy-saving hydrogen production.

[0086] The single-atom supported Os-WO obtained in Examples 1-5 above 2.72 After the electrocatalyst was made into an electrocatalyst, the OER and GOR performance of the catalytic material was tested in an electrochemical workstation. The test conditions were room temperature, the OER electrolyte was 1.0 M KOH, and the GOR electrolyte was a mixed solution of 1.0 M KOH and 0.1 M glucose. The comprehensive results are shown in Table 1. The following results are all obtained when the current density reached 10 mA cm -2 The overpotential at .

[0087] Table 1 shows the OER and GOR performance of the materials prepared in Examples 1-5 as catalysts

[0088]

[0089] 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 electrooxidation and is also conducive to reducing the voltage for efficient H2 production; because the highly active osmium single atom that has no interaction with each other is used as the only active center, different from the simple chemical bond connection, the single atom-loaded Os-WO 2.72 The electrocatalytic material exhibits excellent selectivity for the glucose oxidation reaction (GOR) with the addition of glucose, resulting in a lower overpotential for GOR than for OER.

[0090] The above are preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A single-atom supported Os-WO 2.72 A method for preparing an electrocatalytic material, characterized in that: The method comprises the following steps: (1) fully dissolving a tungsten source in an organic solvent according to a stoichiometric ratio to obtain a solution; (2) heating the solution to react, washing and drying after the reaction to obtain WO 2.72 Carrier material; (3) The WO 2.72 The carrier material is dispersed in a solvent to obtain a dispersion; then potassium citrate and an osmium source are added to the dispersion under ice bath conditions and stirred uniformly to obtain a mixed solution; (4) heating the mixed solution for reaction, washing and drying after the reaction to obtain Os-WO 2.72 Electrocatalytic materials; Wherein, the tungsten source is tungsten hexachloride; the osmium source is potassium chloroosmate; the osmium source, potassium citrate and WO 2.72 The molar ratio of the carrier material is (1-10):50:

20.

2. A single atom supported Os-WO according to claim 1 2.72 A method for preparing an electrocatalytic material, characterized in that: Step (1) dissolving the tungsten source in an organic solvent by ultrasonication and stirring according to a stoichiometric ratio to obtain a solution; wherein the organic solvent is ethanol.

3. A single atom supported Os-WO according to claim 1 or 2 2.72 A method for preparing an electrocatalytic material, characterized in that: The molar volume ratio of the tungsten source to the organic solvent in step (1) is 0.01 to 0.1 mol / L.

4. A single atom supported Os-WO according to claim 1 2.72 A method for preparing an electrocatalytic material, characterized in that: Step (2) placing the solution in a hydrothermal reactor for solvent thermal reaction for 8 to 12 hours, washing with water and alcohol after the reaction, and then drying at 50 to 60° C. to obtain WO 2.72 Carrier material; wherein: the solvent thermal temperature is 150-180°C.

5. The single-atom supported Os-WO according to claim 1 2.72 A method for preparing an electrocatalytic material, characterized in that: The osmium source, potassium citrate and WO in step (3) 2.72 The molar ratio of the total molar amount of the carrier material to the solvent is 1:(1500-1800).

6. The single-atom supported Os-WO according to claim 1 2.72 A method for preparing an electrocatalytic material, characterized in that: The solvent in step (3) is water, the ice bath temperature is 0-5°C, and the stirring speed is 1000-2000 rpm.

7. The single-atom supported Os-WO according to claim 1 2.72 A method for preparing an electrocatalytic material, characterized in that: Step (4) placing the mixed solution in a hydrothermal kettle and reacting at 100-120°C for 3-6 hours, washing with water and alcohol after the reaction, and then drying at 50-60°C to obtain Os-WO 2.72 Electrocatalytic materials.

8. A single atom-supported Os-WO 2.72 An electrocatalytic material, characterized in that The method is prepared by the method according to any one of claims 1 to 7.

9. A single atom-supported Os-WO 2.72 Application of electrocatalytic material, characterized in that The electrocatalytic material prepared by the preparation method according to any one of claims 1 to 7 is used for oxygen evolution reaction and glucose oxidation reaction.

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