RuSe 2 Preparation of Co-NC nanocomposites and their application in hydrogen evolution under alkaline conditions

Abstract

Preparation of RuSe2 / Co-N-C Nanocomposite Material and Its Application in Hydrogen Evolution under Alkaline Conditions. This invention belongs to the field of electrocatalysis preparation and application, specifically involving the preparation of a RuSe2 / Co-N-C nanocomposite material and its application in electrocatalytic hydrogen evolution. First, a white crystalline Co,N-doped carbon nanosheet precursor is prepared via solid-state pyrolysis. Then, Co-N-C nanosheets are synthesized by high-temperature annealing in a tube furnace. Subsequently, RuSe2 is uniformly grown on the Co-N-C nanosheets via a hydrothermal method. Finally, the RuSe2 / Co-N-C nanocomposite material is obtained by annealing in a tube furnace. Benefiting from the synergistic effect induced by Co functionalization and the unique heterostructure interface, the RuSe2 / Co-N-C heterostructure electrocatalyst exhibits excellent hydrogen evolution (HER) performance under alkaline conditions. The synthesized RuSe2 / Co-N-C heterostructure electrocatalyst has advantages such as simple synthesis operation, green and pollution-free process, and excellent HER activity and stability.

Description

Technical Field

[0001] The invention belongs to the field of electrocatalyst preparation and application, and specifically relates to the preparation and application of a RuSe2 / Co-NC nanocomposite material. Background Art

[0002] The energy crisis is hindering the socio-economic development of the world, and there is an urgent need to develop clean energy. Hydrogen (H2) is considered a potential clean energy source due to its high energy density and low environmental pollution. Electrocatalytic hydrogen evolution is an efficient and green H2 production technology. Although electrocatalysts based on the precious metal Pt can achieve stable, efficient and continuous H2 evolution, they are not suitable for widespread application due to their high cost and scarce supply. Therefore, it is urgent to develop a new type of non-precious metal electrocatalyst that can replace Pt with high efficiency and low cost.

[0003] Although Ru is also a rare transition metal element, its price is less than one-fourth of that of Pt, and metal Ru itself has good catalytic activity and catalytic stability. A large number of studies have shown that Ru can be combined with non-metallic elements of group VA or group VIA to become an effective electrocatalyst. It can have a hydrogen binding strength similar to that of Pt and exhibit good HER activity and corrosion resistance. Studies have confirmed that RuS2, RuSe2 and RuTe2 as TMDCs are excellent HER electrocatalysts.

[0004] At the same time, the slow adsorption and dissociation steps of water molecules (Volmer steps) are the main reason for the poor alkaline HER kinetics. ad ) are recombined into H2 and then desorbed from the electrocatalyst. H2O, OH ad and H ad are independent intermediates in these basic reactions. Basically, an ideal catalyst should have a balanced adsorption capacity for each reaction intermediate to achieve fast HER kinetics in alkaline media. It is a reasonable design strategy to construct heterostructured electrocatalysts to trigger a synergistic effect at the heterogeneous interface to enhance the alkaline HER kinetics. Specifically, one component in the heterostructure acts as a water dissociation promoter, while the other is responsible for the subsequent HER process. Carbon-based materials have the significant advantage of high conductivity and have been widely used as electrocatalyst supports. However, they themselves have almost no function to decompose H2O and therefore cannot be used as catalyst promoters for alkaline HER. Therefore, it will be of great significance to endow carbonaceous materials with good conductivity to accelerate the Volmer step to develop efficient heterostructured electrocatalysts for alkaline HER.

[0005] In this paper, we propose a transition metal functionalization strategy for the synthesis of multifunctional carbon nanosheets as electrocatalyst supports for alkaline HER. Specifically, atomically dispersed Co species are confined in N-doped carbon nanosheets (Co-NC) to endow the carbon nanosheets with additional water adsorption and dissociation functions. N doping destroys the electronic neutrality of carbon and induces polarization of adjacent carbon atoms to promote the activation of H2 molecules. The obtained RuSe2 / Co-NC composites have excellent HER performance and stability under alkaline conditions. Summary of the invention

[0006] The purpose of the present invention is to provide a RuSe2 / Co-NC composite material and a preparation method thereof, and to apply the composite material to produce hydrogen by electrolysis of water under alkaline conditions, which has excellent HER performance and stability.

[0007] The technical solution of the present invention is as follows: the present invention provides a RuSe2 / Co-NC composite material. The preparation method of the catalyst is as follows: the RuSe2 / Co-NC nanocomposite material is synthesized by multiple steps, firstly a white crystalline Co, N doped carbon nanosheet precursor is prepared by solid pyrolysis method, then Co-NC nanosheet is synthesized by high temperature annealing in a tubular furnace, then RuSe2 is uniformly grown on the Co-NC nanosheet by a hydrothermal method, and finally the RuSe2 / Co-NC nanocomposite material is obtained by annealing in a tubular furnace.

[0008] The specific process is:

[0009] (1) Synthesis of Co and N doped carbon nanosheets by solid pyrolysis. Specifically, a certain amount of cobalt (II) acetylacetonate was taken as a cobalt source, dissolved together with urea and glucose in a beaker filled with deionized water, and ultrasonicated and stirred for 120 min at room temperature to obtain a pink transparent uniform solution. The mass ratio of cobalt (II) acetylacetonate to urea was 1:150-200, and the mass ratio of cobalt (II) acetylacetonate to glucose was 1:10-15.

[0010] The present invention selects glucose as a carbon source, cobalt acetylacetonate as a cobalt source, and urea as a nitrogen source to obtain a better cobalt-nitrogen doped carbon nanosheet. If the carbon source, cobalt source, and nitrogen source are replaced with other components, the morphology of the cobalt-nitrogen doped carbon nanosheet will be affected, thereby affecting the electrocatalytic performance. At the same time, the carbon nanosheets prepared from different raw materials will have different thicknesses of the nanosheets, as well as the ratio and distribution of cobalt and nitrogen elements, which are all important factors affecting the activity of the catalyst.

[0011] Preferably, the mass ratio of cobalt (II) acetylacetonate to urea is 1:160, and the mass ratio of cobalt (II) acetylacetonate to glucose is 1:10.

[0012] (2) The beaker is opened and placed in a forced air drying oven to completely evaporate the pink solution to obtain a white crystalline precursor. The white crystalline precursor is placed in a crucible and transferred to a tube furnace. N2 is introduced as a protective gas at 5°C﹒ min -1 The heating rate was raised to 900°C and the temperature was maintained for calcination for 5 hours. After the calcination was completed, N2 was continuously introduced and the mixture was naturally cooled to room temperature. The black solid was collected to obtain Co-NC nanosheets. The drying temperature of the blast drying oven was 70°C to 90°C.

[0013] Preferably, the drying temperature of the blast drying oven is 80°C.

[0014] Among them, the calcination temperature affects the graphitization degree of the carbon nanosheets and the binding degree of elemental cobalt. A temperature below 900°C is not conducive to the formation of elemental cobalt and carbon nanosheets with a high degree of graphitization.

[0015] The Co-NC nanosheets prepared by the present invention have good morphology and structure, which is conducive to the subsequent loading of RuSe2 particles, can make the RuSe2 particles and the Co-NC nanosheets more closely combined, and is conducive to the formation and exposure of more heterojunctions, thereby improving the catalytic activity.

[0016] (3) Prepare fresh RuSe2 / Co-NC nanocomposites by hydrothermal method. Specifically, a certain amount of Co-NC was dissolved in deionized water, and after 120 minutes of ultrasonic stirring (ultrasonic treatment was performed under an ultrasonic machine with a power of 220W), Se powder and RuCl3 were added to the above solution, and after 10 minutes of vigorous stirring, 2 mL of hydrazine hydrate (Se powder: hydrazine hydrate is 5 mg: 1 ml) was added. A Teflon-lined autoclave was used as a reaction container, and the obtained solution was transferred into the autoclave. The temperature was raised to 120°C in a blast drying oven and maintained for 12 hours. After the reaction was completed, the autoclave was naturally cooled to room temperature, the liquid was poured out, the precipitate was collected by centrifugation, and then it was thoroughly washed with deionized water and ethanol for 5 to 8 times, and finally dried in a vacuum drying oven at 60°C overnight. Among them, the mass ratio of Se powder to RuCl3 is 1:5 to 6, and the mass ratio of Se powder to Co-NC is 1:0.2 to 1.6. Preferably, the mass ratio of Se powder to Co-NC is 1:0.5.

[0017] (4) The fresh RuSe2 / Co-NC product in the previous step was subjected to thermal annealing in a tube furnace to prepare a RuSe2 / Co-NC nanocomposite material. Specifically, the fresh RuSe2 / Co-NC was loaded into a crucible and placed in a tube furnace. N2 was introduced as a protective gas at 5 °C min -1The heating rate is increased to the set temperature and maintained for 2 hours, and then naturally cooled to room temperature to obtain the final product RuSe2 / Co-NC. The calcination temperature is 300℃~500℃.

[0018] Preferably, the calcination temperature is 400°C.

[0019] The present invention synthesizes RuSe2 / Co-NC nanocomposite materials through multiple steps. First, a white crystalline Co, N-doped carbon nanosheet precursor is prepared through solid pyrolysis, and then Co-NC nanosheets are synthesized through high-temperature annealing in a tubular furnace. Subsequently, RuSe2 is uniformly grown on the Co-NC nanosheets through a hydrothermal method, and finally the RuSe2 / Co-NC nanocomposite materials are obtained through annealing in a tubular furnace. The present invention optimizes the different mass ratios of RuSe2 and Co-NC to obtain the optimal preparation conditions, and finally the RuSe2 / Co-NC nanocomposite materials are applied to electrolysis of water and hydrogen evolution in an alkaline environment.

[0020] RuSe2 / Co-NC nanocomposites are used in the electrocatalytic hydrogen evolution performance test method, using a three-electrode system. The working electrode is a glassy carbon electrode loaded with RuSe2 / Co-NC nanocomposites, the counter electrode is a graphite rod electrode, the reference electrode is a Hg / HgO electrode, and the electrolyte is a 1 mol / L KOH solution.

[0021] The technical effects achieved by the present invention are:

[0022] (1) Co-NC nanosheets with wrinkled morphology and a large number of active sites were prepared by solid pyrolysis.

[0023] (2) For the first time, RuSe2 was uniformly loaded on the surface of Co-NC nanosheets by a hydrothermal method to prepare RuSe2 / Co-NC nanocomposites.

[0024] (3) The effect of the amount of Co-NC added on the electrocatalytic HER performance of RuSe2 / Co-NC nanocomposites was studied. The heterostructure formed between RuSe2 and Co-NC is beneficial to the improvement of electrocatalytic performance.

[0025] (4) The prepared RuSe2 / Co-NC-5 has excellent electrocatalytic HER performance and stability in alkaline solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the SEM image of Example 1.

[0027] Figure 2These are the XRD diagrams of Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4.

[0028] Figure 3 HER polarization curves of Example 1, Example 2, Example 3 and Example 4 in 1.0 M KOH solution for water electrolysis.

[0029] Figure 4 Polarization curves of HER of water electrolysis in 1.0M KOH solution of Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4.

[0030] Figure 5 The Tafel curves of HER of water electrolysis in 1.0 M KOH solution are shown in FIG. 1 , 2, 3 and 4.

[0031] Figure 6 The Tafel curves of HER of water electrolysis in 1.0M KOH solution are shown in Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4.

[0032] Figure 7 This is the current-time curve of Example 1 when water is electrolyzed for 17 hours at an overpotential of 26 mV. DETAILED DESCRIPTION

[0033] The present invention further illustrates the technical features of the present invention with the following examples, but the protection scope of the present invention is not limited to the following embodiments.

[0034] Example 1

[0035] Preparation of 1.1 mol / L KOH solution

[0036] Dissolve 5.62 g KOH in 50 mL ultrapure water. After the KOH solution is completely dissolved and cooled, dilute to volume in a 100 mL volumetric flask.

[0037] 2. Preparation of Co and N doped carbon nanosheets

[0038] (1) Co and N-doped carbon nanosheets were synthesized by solid pyrolysis. Specifically, 0.05 g of cobalt (II) acetylacetonate was used as a cobalt source and added to 40 mL of deionized water together with 8.0 g of urea and 0.50 g of glucose. The mixture was ultrasonicated and stirred for 120 min at room temperature to obtain a pink transparent uniform solution.

[0039] (2) Place the beaker open in a forced air drying oven at 80°C to completely evaporate the pink solution to obtain a white crystalline precursor, place it in a crucible and transfer it to a tube furnace, introduce N2 as a protective gas, and heat at 5°C﹒ min -1 The heating rate was increased to 900°C and the temperature was maintained for calcination for 5 h. After the calcination, N2 was continued to be introduced and naturally cooled to room temperature. The black solid was collected to obtain Co-NC nanosheets.

[0040] 3.Fresh RuSe2 / Co-NC nanocomposites

[0041] Fresh RuSe2 / Co-NC nanocomposites were prepared by a hydrothermal method. Specifically, 5 mg Co-NC was dissolved in 35 ml deionized water. After 120 min of ultrasonic vigorous stirring, 0.0098 g Se powder and 0.0518 g RuCl3 were added to the above solution. After vigorous stirring for 10 min, 2 ml of hydrazine hydrate was added. A 50 ml Teflon-lined autoclave was used as a reaction container, the resulting solution was transferred thereto, the temperature was raised to 120°C in a forced air drying oven and maintained for 12 h. After the reaction was completed, the reactor was naturally cooled to room temperature, the liquid was poured out, the precipitate was collected by centrifugation, and then it was thoroughly washed with deionized water and ethanol for 5 to 8 times, and finally dried in a vacuum drying oven at 60°C overnight.

[0042] 4. Preparation of RuSe2 / Co-NC nanocomposites

[0043] The product of the previous step, Fresh RuSe2 / Co-NC, was subjected to thermal annealing in a tube furnace to prepare RuSe2 / Co-NC nanocomposites. Specifically, Fresh RuSe2 / Co-NC was loaded into a crucible and placed in a tube furnace. N2 was introduced as a protective gas at 5 °C min -1 The heating rate was increased to 400 °C and maintained for 2 h, and then naturally cooled to room temperature to obtain the final product RuSe2 / Co-NC.

[0044] application

[0045] 1. Activation treatment of electrocatalyst

[0046] (1) 2 mg of catalyst and 10 μL of 5 wt% Nafion were dispersed in a mixed solution containing 375 μL of ultrapure water and 125 μL of ethanol to prepare a catalyst ink. After continuous ultrasonic treatment for 20 minutes, 5 μL of uniform ink was dropped onto a pre-polished glassy carbon electrode with a diameter of 3 mm and then dried naturally at room temperature.

[0047] (2) A three-electrode system was used, wherein the working electrode was a glassy carbon electrode with the surface drop-coated with Example 1, the counter electrode was a graphite rod electrode, the reference electrode was a Hg / HgO electrode, and the electrolyte was 1 mol / L KOH;

[0048] (3) Cyclic voltammetry (CV) activation: Shanghai Chenhua DH7000 electrochemical workstation was used with CV program, the test range was -0.8 to -1.6 V vs. RHE, the scan rate was 100 mV / s, and the cycle was repeated for 20 times until the electrode reached a stable state.

[0049] 2. Linear sweep voltammetry (LSV) test

[0050] After activation, the program was switched to linear sweep voltammetry with a test interval of -0.8 to -1.6 V vs. RHE and a scan rate of 5 mV / s. The electrocatalyst was at -10 mA / cm 2 When the overpotential is 26mV, Figure 3 shown.

[0051] 3. Stability test

[0052] After activation, switch the program to the chronoamperometry program, set the voltage to 26mv, and the time to 61200s. Figure 7 As shown, the voltage of the electrocatalyst does not change much, demonstrating its good stability.

[0053] The SEM image of Example 1 is as follows Figure 1 As shown in Figure 2, the synthesized RuSe2 / Co-NC nanocomposite has a regular morphology. Figure 2 As shown in the figure, the RuSe2 / Co-NC sample obtained after high-temperature annealing at 400°C has good crystallinity, and all diffraction peaks match those of crystalline RuSe2. At the same time, the broad peak at 25.5° belonging to metal Co is also consistent with the sharp diffraction peak at 44.1°, which proves the successful synthesis of RuSe2 / Co-NC nanocomposite materials.

[0054] Example 2

[0055] Compared with Example 1, the difference is that the amount of Co-NC is changed to 0.002 g during the preparation process, and the other preparation methods are the same as Example 1.

[0056] The application method is the same as that of Example 1. The RuSe2 / Co-NC nanocomposite prepared in Example 2 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2 When the overpotential is 68mV.

[0057] Example 3

[0058] Compared with Example 1, the difference is that the amount of Co-NC is changed to 0.01 g during the preparation process, and the other preparation methods are the same as Example 1.

[0059] The application method is the same as that of Example 1. The RuSe2 / Co-NC nanocomposite prepared in Example 3 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2 When , the overpotential is 59mV.

[0060] Example 4

[0061] Compared with Example 1, the difference is that the amount of Co-NC is changed to 0.015 g during the preparation process, and the other preparation methods are the same as Example 1.

[0062] The application method is the same as that of Example 1. The RuSe2 / Co-NC nanocomposite prepared in Example 4 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2 When , the overpotential is 113mV.

[0063] Example 5

[0064] Compared with Example 1, the difference is that the annealing temperature is not changed to 300° C. during the synthesis of RuSe2 / Co-NC.

[0065] The application method is the same as that of Example 1. The RuSe2 / Co-NC nanosheet composite material prepared in Example 5 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2 When , the overpotential is 69mV.

[0066] Example 6

[0067] Compared with Example 1, the difference is that the annealing temperature is not changed to 500° C. during the synthesis of RuSe2 / Co-NC.

[0068] The application method is the same as that of Example 1. The RuSe2 / Co-NC nanosheet composite material prepared in Example 6 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2 When the overpotential is 48mV.

[0069] It can be seen that the calcination temperature affects the crystallinity of the catalyst. The catalyst obtained at a calcination temperature of 400 °C has good crystallinity and catalytic activity. The performance is -2Under the condition of calcination temperature of 300℃, the overpotential is 26mV. When only the calcination temperature is changed to 300℃, the crystallinity of the catalyst is not high, which will affect the formation of heterogeneous structure to a certain extent. The performance is not good at a current density of 10mA cm -2 Under the condition of calcination at 400℃, the overpotential is 69mV. When the calcination temperature is only changed to 500℃, the RuSe2 particles loaded on the Co-NC nanosheets will agglomerate to a certain extent, thus affecting the catalytic activity of the catalyst. Under the calcination condition of 400℃, not only a catalyst with good crystallinity and heterogeneous structure can be obtained, but also more active sites of Co-NC nanosheets and RuSe2 heterogeneous structure will be exposed, thus having good catalytic activity.

[0070] Comparative Example 1

[0071] Compared with Example 1, the difference is that during the preparation process, the Fresh RuSe2 / Co-NC is not subjected to tubular furnace calcination and is directly used as a working electrode for testing.

[0072] The application method is the same as that of Example 1. The FreshRuSe2 / Co-NC nanocomposite prepared in Example 1 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2 When , the overpotential is 111mV.

[0073] The present invention makes RuSe2 and Co-NC more tightly combined after calcination in a tubular furnace, thereby forming a heterogeneous structure of RuSe2 and Co-NC, thereby greatly improving the hydrogen evolution performance of the catalyst. Compared with Example 1, the hydrogen evolution performance of Fresh RuSe2 and Fresh RuSe2 / Co-NC without calcination in a tubular furnace is not much different. At the same time, if only Fresh RuSe2 is calcined to obtain RuSe2 material, the performance improvement is also very limited. Only the RuSe2 / Co-NC material obtained after calcination of Fresh RuSe2 / Co-NC has a huge improvement in hydrogen evolution performance, which also shows that the catalytic performance of the present invention benefits from the heterogeneous structure formed between RuSe2 and Co-NC after calcination.

[0074] Comparative Example 2

[0075] Compared with Example 1, the difference is that the Co-NC nanoblocks prepared by replacing the raw materials are directly used as the working electrode.

[0076] The application method is the same as that of Example 1. The Co-NC material prepared in Comparative Example 2 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2When , the overpotential is 289mV.

[0077] Compared with Example 1, the difference is that dicyandiamide is used as the nitrogen source and carbon source, cobalt nitrate is used as the cobalt source, and other conditions are the same. Finally, a blocky cobalt-nitrogen-doped carbon structure is obtained, and a nanosheet structure cannot be obtained.

[0078] Comparative Example 3

[0079] Compared with Example 1, the difference is that Co-NC is not added during the synthesis of RuSe2.

[0080] The application method is the same as that of Example 1. The RuSe2 material prepared in Example 3 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2 When the overpotential is 90mV.

[0081] Comparative Example 4

[0082] Compared with Example 1, the difference is that Co-NC is not added during the synthesis of FreshRuSe2, and the annealing operation is not performed in a tube furnace at 400°C.

[0083] The application method is the same as that of Example 1. The FreshRuSe2 material prepared in Example 4 is electrocatalytically decomposed into water to produce hydrogen in a KOH electrolyte with a concentration of 1 mol / L. The cathode is charged at a current density of 10 mA / cm 2 When , the overpotential is 113mV.

Claims

1. A method for preparing a RuSe2 / Co-NC nanocomposite material, characterized in that: The specific steps of the preparation method are as follows: (1) Cobalt acetylacetonate is used as a cobalt source, wherein the valence state of cobalt is divalent, and is dissolved in deionized water together with urea and glucose, and stirred to obtain a pink transparent uniform solution; (2) placing the solution of step (1) in a drying oven, completely evaporating the pink transparent uniform solution to obtain a white crystalline precursor, placing the precursor in a crucible and transferring it to a tube furnace, introducing N2 as a protective gas, heating the furnace to 900°C and maintaining the temperature for calcination. After the calcination is completed, continuing to introduce N2 to cool the mixture naturally to room temperature, and collecting the black solid to obtain Co-NC nanosheets; (3) Preparation of fresh RuSe2 / Co-NC nanocomposites by hydrothermal method: Co-NC nanosheets are dispersed in deionized water, and after vigorous ultrasonic stirring, Se powder and RuCl3 are added thereto, and vigorous stirring is continued. Hydrazine hydrate is then added, and a high-pressure reactor is used as a reaction vessel to transfer the obtained solution thereto, and the temperature is raised for reaction. After the reaction is completed, the reactor is naturally cooled to room temperature, the liquid is poured out, the precipitate is collected by centrifugation, washed, and dried to obtain fresh RuSe2 / Co-NC; (4) The fresh RuSe2 / Co-NC was thermally annealed in a tube furnace to prepare RuSe2 / Co-NC nanocomposite materials: fresh RuSe2 / Co-NC was loaded into a crucible and placed in a tube furnace. N2 was introduced as a protective gas and the temperature was raised to 300°C~500°C for calcination. After calcination, the RuSe2 / Co-NC was naturally cooled to room temperature to obtain the final product RuSe2 / Co-NC.

2. The method for preparing the RuSe2 / Co-NC nanocomposite material according to claim 1, characterized in that: In step (1), the mass ratio of cobalt acetylacetonate to urea is 1:150-200.

3. The method for preparing the RuSe2 / Co-NC nanocomposite material according to claim 1, characterized in that: In step (1), the mass ratio of cobalt acetylacetonate to glucose is 1:10-15.

4. The method for preparing the RuSe2 / Co-NC nanocomposite material according to claim 1, characterized in that: In step (3), the mass ratio of Se powder to RuCl3 is 1:5~6, and the mass ratio of Se powder to Co-NC is 1:0.2~1.

6.

5. The method for preparing the RuSe2 / Co-NC nanocomposite material according to claim 1, characterized in that: The calcination time in step (2) is 5 h.

6. The method for preparing the RuSe2 / Co-NC nanocomposite material according to claim 1, characterized in that: The temperature of step (3) is 120 °C and maintained for 12 h.

7. The method for preparing the RuSe2 / Co-NC nanocomposite material according to claim 1, characterized in that: The calcination temperature in step (4) is 400° C. and the calcination time is 2 h.

8. An application of a RuSe2 / Co-NC nanocomposite material prepared by the method according to any one of claims 1 to 7, characterized in that: The RuSe2 / Co-NC nanocomposite material is used for electrocatalytic hydrogen evolution under alkaline conditions.

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