High-entropy alloy carbon nano composite fiber membrane as well as preparation method and application thereof

Abstract

The invention provides a high-entropy alloy carbon nano composite fiber membrane, zinc element and one or more metal elements of iron, cobalt, nickel, magnesium, manganese and copper are compounded and concentrated on the surface of carbon nanofiber in a metal oxide form, the diameter of the carbon nanofiber in the composite fiber membrane is 100-600nm, the fiber is of a porous structure, and the specific surface area is 80-450m < 2 > / g; the fiber membrane is prepared by the following steps: adding metal salt and / or a metal oxide precursor into a solvent, stirring and dissolving to obtain a metal salt precursor dispersion liquid, adding polyacrylonitrile, heating and stirring to obtain a composite fiber membrane spinning solution, and carrying out electrostatic spinning, pre-oxidation and carbonization treatment. The prepared composite fiber membrane is high in evaporation rate and high in output current and voltage, and can be applied to the field of water and electricity co-production.

Description

Technical Field

[0001] The present invention relates to the technical field of composite fiber membranes, and in particular, to a high-entropy alloy carbon nano composite fiber membrane, a preparation method thereof, and an application thereof. Background Art

[0002] In recent years, the concept of interfacial solar evaporation has received extensive attention. The interfacial solar evaporation technology absorbs solar energy through a photothermal material and converts it into heat energy. At the same time, a large amount of water is transported to the evaporation surface to achieve evaporation, so as to achieve the continuous and stable operation of the evaporation process. At the same time, during the evaporation process, the temperature difference generated between the evaporation interface and the external environment due to the conversion of solar energy and heat energy, as well as the salt particle concentration difference generated by the transportation of brine, can all be used for power generation.

[0003] The prior art has tried to prepare lignin aerogel by compounding wood sponge with honeycomb-like porous carbon nanofibers to achieve moisture absorption and water conductivity, to reach a certain evaporation rate, and to generate a certain amount of power output during the water conduction process. However, the evaporation rate and power output are still difficult to meet the application requirements, and at the same time, there is also the problem of complex preparation process, making it difficult to be widely applied. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a high-entropy alloy carbon nano composite fiber membrane. By adding zinc oxide, metal particles are migrated to the surface of carbon fibers during the carbonization process, thereby improving the water conductivity on the surface of carbon nanofibers, while increasing the porosity of the carbon nanofiber membrane and improving the transmission and diffusion efficiency of water in the fiber membrane.

[0005] To achieve the above object, the present invention provides a high-entropy alloy carbon nano composite fiber membrane, wherein the carbon fibers in the fiber membrane are compounded with one or more metal elements of zinc, iron, cobalt, nickel, magnesium, manganese, and copper, and the metal elements are compounded with carbon nanofibers in the form of metal oxides, and the mass fraction of the metal elements in the carbon nanofiber membrane is 20-80%;

[0006] The diameter of the carbon nanofibers in the composite fiber membrane is 100-600 nm, the fibers are in a porous structure, and the specific surface area is 80-450 m 2 / g, and the metal elements are concentrated on the surface of the carbon nanofibers.

[0007] In some technical solutions of the present invention, the metal oxides include one or more of zinc oxide, iron oxide, cobalt oxide, nickel oxide, magnesium oxide, manganese oxide, manganese oxide, and copper oxide. Preferably, the metal oxides at least include a composition of iron oxide, cobalt oxide, nickel oxide, magnesium oxide, manganese oxide, and zinc oxide.

[0008] In some technical solutions of the present invention, the mass fraction of the metal element in the carbon nanocomposite fiber membrane is 40-80 wt%, specifically, it can be exemplified as 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, and further preferably 55-70 wt%.

[0009] In some technical solutions of the present invention, the metal element includes six metal elements: zinc, iron, cobalt, nickel, magnesium, and manganese. Further, the molar ratio of the five elements of iron, cobalt, nickel, magnesium, and manganese is 2:2:2:2:1.

[0010] In some technical solutions of the present invention, the fiber diameter is 250-400 nm, and further preferably 340-370 nm.

[0011] In some technical solutions of the present invention, the specific surface area of the fiber is 250-350 m 2 / g.

[0012] With the increase of the composite amount of the metal element, the fiber diameter will gradually increase, and the specific surface area of the fiber will decrease, affecting the photothermal area, and then resulting in a decrease in the evaporation rate. However, at the same time, the increase in the metal element content will also increase the metal oxides on the surface of the fiber membrane and improve the hydrophilicity, making the water absorption of the composite fiber membrane increase, thereby increasing the evaporation rate. When the metal element content is low, the increase in the metal element content mainly affects the improvement of the water absorption of the fiber membrane, and the evaporation rate shows an overall upward trend. When the metal element content reaches 55-70%, the evaporation rate reaches the optimal state. When the metal element content further increases, the influence of the decrease in the photothermal area on the evaporation rate begins to become larger, offsetting the improvement of the evaporation rate due to the increase in the hydrophilicity of the fiber membrane, and the evaporation rate reaches a relatively balanced state. At the same time, as the evaporation rate increases, the movement rate of the salt ions in the salt water accelerates, thereby improving the power generation capacity. However, the increase in the metal element content increases the metal oxides on the surface of the fiber membrane, which in turn leads to an increase in the resistance of the fiber membrane and affects the electrical output performance. When the content exceeds 80 wt%, it is difficult to obtain ideal electrical output performance.

[0013] The present invention also provides a preparation method of a high-entropy alloy carbon nanocomposite fiber membrane, which at least includes the following steps:

[0014] Step 1: Add a metal salt and / or a metal oxide precursor to an N,N-dimethylformamide solvent and stir to dissolve to obtain a metal salt precursor dispersion;

[0015] Step 2: Add polyacrylonitrile to the precursor dispersion prepared in Step 1, heat and stir to obtain a composite fiber membrane spinning solution;

[0016] Step 3: Electrospun the spinning solution obtained in Step 2 to obtain a composite fiber membrane;

[0017] Step 4: Pre-oxidize the composite fiber membrane obtained in Step 3, and then perform carbonization treatment in an inert gas to obtain the high-entropy alloy carbon nanocomposite fiber membrane.

[0018] In some technical solutions of the present invention, in the precursor dispersion liquid in Step 1, the mass concentration of the metal salt and / or metal oxide precursor component is 5-20 wt%, specifically, 5%, 8%, 10%, 12%, 13%, 14%, 15%, 16%, 18%, 20% can be exemplified. Preferably, the mass concentration of the metal salt and / or metal oxide precursor component is 13-16 wt%. The high-entropy alloy carbon nanocomposite fiber membrane prepared within this range

[0019] In some technical solutions of the present invention, at least zinc oxide is included in the metal salt and / or metal oxide in Step 1. Zinc oxide is reduced to elemental zinc at the carbonization temperature, and the temperature exceeds the melting point of zinc, which will melt into liquid zinc and flow in the carbon fiber skeleton, and carry other metals to migrate from the inside to the fiber surface, improving the porosity of the carbon fiber.

[0020] In some technical solutions of the present invention, the metal elements contained in the metal salt and / or metal oxide in Step 1 further include one or more of iron, cobalt, nickel, magnesium, manganese, and copper. The preferred metal elements include iron, cobalt, nickel, magnesium, and manganese. Further, the molar ratio of the metal elements iron, cobalt, nickel, magnesium, manganese, and zinc is 2:2:2:2:1:1. The metal salt is selected from one or more of chlorides and their hydrates, acetates and their hydrates, sulfates and their hydrates, and nitrates and their hydrates.

[0021] In some preferred technical solutions of the present invention, the metal salt and / or metal oxide precursor combination in Step 1 at least includes zinc oxide, manganese oxide, magnesium sulfate, iron(III) chloride hexahydrate, cobalt(II) acetate tetrahydrate, and nickel(II) acetate tetrahydrate.

[0022] In some technical solutions of the present invention, the stirring time in Step 1 is 20-120 minutes.

[0023] In some technical solutions of the present invention, the mass concentration of the polyacrylonitrile in the precursor dispersion liquid in Step 2 is 8-12%, specifically, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12% can be exemplified. Preferably, the mass concentration of the polyacrylonitrile is 9-11%.

[0024] In some technical solutions of the present invention, the stirring temperature in Step 2 is 50-80 °C, the stirring time is 2-4 h, and the rotation speed is 300-1000 r / min.

[0025] In some technical solutions of the present invention, in step 3, the process parameters of the electrospinning include: the inner diameter of the needle is 0.25 - 0.82 mm, the static voltage is 10 - 15 KV, the injection speed of the injection pump is 0.8 - 1 mm / min, the spinning distance is 12 - 17 cm, the collecting plate is a flat collecting plate, the ambient temperature is 25 ± 5 °C, and the ambient humidity is 45 ± 5% RH.

[0026] In some technical solutions of the present invention, in step 3, the pre-oxidation temperature is 150 - 250 °C, the time is 1.5 - 2.5 h, and the time is 1 - 4 h.

[0027] In some technical solutions of the present invention, in step 3, the carbonization temperature is 800 - 1000 °C.

[0028] In addition, the present invention also provides the application of the high-entropy alloy carbon nanocomposite fiber membrane in the field of combined heat and power generation, specifically, it can be applied to the field of seawater desalination. During the seawater desalination process of the fiber membrane, ions in the salt water can drive the electrons on the fiber surface to form charge flow during transportation, thereby generating electric energy, and electric energy output can be generated after being connected to the circuit.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. Adding a high-entropy alloy to the carbon nanofiber membrane can effectively improve the hydrophilicity of the composite fiber membrane, and at the same time has a high porosity, enabling water to be effectively and stably transported and diffused in the high-entropy alloy carbon nanocomposite fiber membrane, achieving a high and stable evaporation rate. At the same time, along with the high-speed and stable evaporation of seawater on the surface of the composite fiber membrane, ions in the salt water can drive the electrons on the fiber surface to form charge flow during transportation, thereby generating electric energy.

[0031] 2. Adding zinc oxide to the carbon nanocomposite fiber membrane is reduced to zinc metal at the carbonization temperature, and the temperature exceeds the melting point of zinc, which will melt into liquid zinc and flow in the carbon fiber skeleton, and carry other metals to migrate from the inside to the fiber surface, improving the porosity of the carbon fiber and the water conductivity on the fiber surface, thereby enhancing the evaporation rate of water and the power generation capacity.

[0032] 3. Using classical spinning to obtain the high-entropy alloy carbon nanocomposite fiber membrane is convenient to prepare and has a simple process, which can reduce the cost of material preparation and save resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the attached drawings required for the description of the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0034] Figure 1 Scanning electron microscope image of the high-entropy alloy carbon nanotube composite fiber membrane prepared in Example 1

[0035] Figure 2 Scanning electron microscope image of the high-entropy alloy carbon nanotube composite fiber membrane prepared in Example 3

[0036] Figure 3 Scanning electron microscope image of the high-entropy alloy carbon nanotube composite fiber membrane prepared in Comparative Example 2 Detailed implementation manners

[0037] The following combines the embodiments in the present invention to clearly and completely describe the technical solutions in the present invention. The described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] Example 1

[0039] Preparation of the high-entropy alloy carbon nanotube composite fiber membrane:

[0040] Step 1: Add 1.08 g of ferric chloride hexahydrate, 0.996 g of cobalt acetate tetrahydrate, 0.995 g of nickel acetate tetrahydrate, 0.481 g of magnesium sulfate, 0.49 g of manganese oxide, and 0.163 g of zinc oxide to 79.9 g of N,N-dimethylformamide, stir and dissolve at room temperature, with a stirring rate of 450 rpm, to obtain a metal salt precursor dispersion with a concentration of 5 wt%.

[0041] Step 2: Add 2 g of polyacrylonitrile powder to 18 g of the precursor dispersion in Step 1 at a concentration of 10 wt%, heat and stir in a water bath until completely dissolved, with a heating temperature of 60 °C, a stirring rate of 450 rpm, and a stirring time of 2 h, to obtain a composite fiber membrane spinning solution.

[0042] Step 3: Add the composite fiber membrane spinning solution obtained in Step 2 to a metal needle syringe with a capacity of 10 mL, with a needle inner diameter of 0.33 mm, install it on an injection pump, and perform electrospinning at an injection rate of 1.0 mL / h, a voltage of 12 kV, and an injection distance of 15 cm, collect the nanofiber membrane on aluminum foil, and the spinning time is 4.5 h to obtain a composite fiber membrane.

[0043] Step 4: Tear the composite fiber membrane obtained in Step 3 from the aluminum foil paper, place it in an oven, and perform pre-oxidation at 200 °C for 2 h. Place the pre-oxidized fiber membrane obtained in a tubular furnace and perform carbonization under a nitrogen atmosphere. First, heat it to 100 °C at a heating rate of 5 °C / min and hold for 30 min, then heat it to 800 °C at a heating rate of 5 °C / min and hold for 2 h. After natural cooling, a high-entropy alloy carbon nano composite fiber membrane is obtained.

[0044] Preparation of seawater evaporation device: Use the dried wet wipes as the water-conducting layer and PS foam plastic as the suspension layer. After the wet wipes and the foam are combined, place the high-entropy alloy carbon nano composite fiber membrane obtained in Step 4 on the wet wipes and test its evaporation rate under the intensity of one sun; Test the voltage and current output by the high-entropy alloy carbon nano fiber under the intensity of one sun with a digital multimeter. The specific operation is to connect the positive pole of the digital multimeter to the sample surface and the negative pole to the water until the output signal is stable.

[0045] Example 2

[0046] Preparation of high-entropy alloy carbon nano composite fiber membrane:

[0047] Step 1: Add 1.08 g of ferric chloride hexahydrate, 0.996 g of cobalt acetate tetrahydrate, 0.995 g of nickel acetate tetrahydrate, 0.481 g of magnesium sulfate, 0.49 g of manganese oxide, and 0.163 g of zinc oxide to 79.9 g of N,N-dimethylformamide, stir and dissolve at room temperature, with a stirring rate of 450 rpm, to prepare a metal salt precursor dispersion with a concentration of 10 wt%.

[0048] Step 2: Add 2 g of polyacrylonitrile powder to the precursor dispersion in Step 1 at a concentration of 10 wt%, heat and stir in a water bath until completely dissolved, with a heating temperature of 60 °C, a stirring rate of 450 rpm, and a stirring time of 2 h to obtain a composite fiber membrane spinning solution.

[0049] Step 3: Add the composite fiber membrane spinning solution obtained in Step 2 to a metal needle syringe with a volume of 10 mL, with a needle inner diameter of 0.33 mm, install it on an injection pump, and perform electrospinning at an injection rate of 1.0 mL / h, a voltage of 12 kV, and an injection distance of 15 cm, and collect the nanofiber membrane on aluminum foil paper. The spinning time is 4.5 h to obtain a composite fiber membrane.

[0050] Step 4: Tear the composite fiber membrane obtained in Step 3 from the aluminum foil paper, place it in an oven, and perform pre-oxidation at 200 °C for 2 h. Place the pre-oxidized fiber membrane obtained in a tube furnace and perform carbonization under a nitrogen atmosphere. First, heat it to 100 °C at a heating rate of 5 °C / min and hold for 30 min, then heat it to 800 °C at a heating rate of 5 °C / min and hold for 2 h. After natural cooling, a high-entropy alloy carbon nanocomposite fiber membrane is obtained.

[0051] Preparation of seawater evaporation device: Use the dried wet wipe as the water-conducting layer and PS foam plastic as the suspension layer. After the wet wipe and the foam are compounded, place the high-entropy alloy carbon nanocomposite fiber membrane obtained in Step 4 on the wet wipe and test its evaporation rate under the intensity of one sun; Test the voltage and current output by the high-entropy alloy carbon nanofibers under the intensity of one sun with a digital multimeter. The specific operation is to connect the positive electrode of the digital multimeter to the sample surface and the negative electrode to the water until the output signal is stable and then end.

[0052] Example 3

[0053] Preparation of high-entropy alloy carbon nanocomposite fiber membrane:

[0054] Step 1: Add 1.08 g of ferric chloride hexahydrate, 0.996 g of cobalt acetate tetrahydrate, 0.995 g of nickel acetate tetrahydrate, 0.481 g of magnesium sulfate, 0.49 g of manganese oxide, and 0.163 g of zinc oxide to 79.9 g of N,N-dimethylformamide, stir and dissolve at room temperature, with a stirring rate of 450 rpm, to prepare a metal salt precursor dispersion with a concentration of 15 wt%.

[0055] Step 2: Add 2 g of polyacrylonitrile powder to 18 g of the precursor dispersion in Step 1 at a concentration of 10 wt%, heat and stir in a water bath until completely dissolved, with a heating temperature of 60 °C, a stirring rate of 450 rpm, and a stirring time of 2 h to obtain a composite fiber membrane spinning solution.

[0056] Step 3: Add the composite fiber membrane spinning solution obtained in Step 2 to a metal needle syringe with a volume of 10 mL and a needle inner diameter of 0.33 mm. Install it on an injection pump and perform electrospinning at an injection rate of 1.0 mL / h, a voltage of 12 kV, and an injection distance of 15 cm. Collect the nanofiber membrane on aluminum foil paper, and the spinning time is 4.5 h to obtain a composite fiber membrane.

[0057] Step 4: Tear the composite fiber membrane obtained in Step 3 from the aluminum foil paper, place it in an oven, and perform pre-oxidation at 200 °C for 2 h. Place the pre-oxidized fiber membrane obtained in a tubular furnace and perform carbonization under a nitrogen atmosphere. First, heat it to 100 °C at a heating rate of 5 °C / min and hold for 30 min, then heat it to 800 °C at a heating rate of 5 °C / min and hold for 2 h. After natural cooling, a high-entropy alloy carbon nano composite fiber membrane is obtained.

[0058] Preparation of seawater evaporation device: Use the dried wet wipe as the water-conducting layer and PS foam plastic as the suspension layer. After the wet wipe and the foam are compounded, place the high-entropy alloy carbon nano composite fiber membrane obtained in Step 4 on the wet wipe and test its evaporation rate under the intensity of one sun; test the voltage and current output by the high-entropy alloy carbon nano fiber under the intensity of one sun with a digital multimeter. The specific operation is to connect the positive pole of the digital multimeter to the sample surface and the negative pole to the water until the output signal is stable and then end.

[0059] Example 4

[0060] Preparation of high-entropy alloy carbon nano composite fiber membrane:

[0061] Step 1: Add 1.08 g of ferric chloride hexahydrate, 0.996 g of cobalt acetate tetrahydrate, 0.995 g of nickel acetate tetrahydrate, 0.481 g of magnesium sulfate, 0.49 g of manganese oxide, and 0.163 g of zinc oxide to 79.9 g of N,N-dimethylformamide, stir and dissolve at room temperature with a stirring rate of 450 rpm to prepare a metal salt precursor dispersion with a concentration of 20 wt%.

[0062] Step 2: Add 2 g of polyacrylonitrile powder to 18 g of the precursor dispersion in Step 1 at a concentration of 10 wt%, heat and stir in a water bath until completely dissolved, with a heating temperature of 60 °C, a stirring rate of 450 rpm, and a stirring time of 2 h to obtain a composite fiber membrane spinning solution.

[0063] Step 3: Add the composite fiber membrane spinning solution obtained in Step 2 to a metal needle syringe with a volume of 10 mL and a needle inner diameter of 0.33 mm, install it on an injection pump, and perform electrospinning at an injection rate of 1.0 mL / h, a voltage of 12 kV, and an injection distance of 15 cm. Collect the nanofiber membrane on the aluminum foil paper, and the spinning time is 4.5 h to obtain a composite fiber membrane.

[0064] Step 4: Tear the composite fiber membrane obtained in Step 3 from the aluminum foil paper, place it in an oven, and perform pre-oxidation at 200 °C for 2 h. Place the pre-oxidized fiber membrane in a tube furnace and perform carbonization under a nitrogen atmosphere. First, heat it to 100 °C at a heating rate of 5 °C / min and hold for 30 min, then heat it to 800 °C at a heating rate of 5 °C / min and hold for 2 h. After natural cooling, a high-entropy alloy carbon nano-composite fiber membrane is obtained.

[0065] Preparation of seawater evaporation device: Use the dried wet wipe as the water-conducting layer and PS foam plastic as the suspension layer. After the wet wipe and the foam are combined, place the high-entropy alloy carbon nano-composite fiber membrane obtained in Step 4 on the wet wipe and test its evaporation rate under the intensity of one sun; Test the voltage and current output by the high-entropy alloy carbon nano-fiber under the intensity of one sun through a digital multimeter. The specific operation is to connect the positive pole of the digital multimeter to the sample surface and the negative pole to the water until the output signal is stable and then end.

[0066] Comparative Example 1: The only difference from Example 3 is that zinc oxide is not added to the precursor dispersion liquid in Step 1

[0067] Comparative Example 2: The only difference from Example 3 is that zinc oxide in the precursor dispersion liquid is replaced with zinc chloride in Step 1.

[0068] Comparative Example 3: The only difference from Example 3 is that the precursor dispersion liquid is not added.

[0069] Performance testing and description:

[0070] Table 1 Fiber diameters and specific surface areas of Examples 1-4 and Comparative Examples 1-3

[0071] Group Fiber diameter (nm) <![CDATA[Specific surface area (m 2 ·g -1 )]]> Example 1 125.32 417.77 Example 2 223.54 295.93 Example 3 351.16 294.91 Example 4 534.63 86.75 Comparative Example 1 324.72 257.43 Comparative Example 2 316.59 247.38 Comparative Example 3 122.97 389.74

[0072] Table 2 Evaporation performance table of Examples 1-4 and Comparative Examples 1-3

[0073] Group <![CDATA[Evaporation rate (kg·m -2 ·h -1 )]]> Example 1 1.83 Example 2 2.04 Example 3 2.24 Example 4 2.22 Comparative Example 1 1.35 Comparative Example 2 1.54 Comparative Example 3 1.03

[0074] Table 3 Electrical output performance table of Examples 1-4 and Comparative Examples 1-3

[0075]

[0076] From the test data of Examples 1-4, it can be seen that for the high-entropy alloy carbon nano-composite fiber membrane prepared by the present invention, the evaporation rate can reach 1.83 kg / m 2 ·h, and the highest can reach 2.24 kg / m 2 ·h. And while evaporating seawater, it can stably output current and voltage. The output voltage reaches more than 500 mV, and the output current can reach more than 76 μA, and the highest can exceed 290 μA.

[0077] The following points should be finally noted: Although the present invention has been described in detail above with general descriptions and specific embodiments, on the basis of the present invention, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-entropy alloy carbon nanocomposite fiber membrane, characterized in that, The carbon nanocomposite fiber membrane is composited with zinc element and one or more metal elements selected from iron, cobalt, nickel, magnesium, manganese, and copper. The metal element is composited with carbon nanofibers in the form of metal oxides, and the mass fraction of the metal element in the carbon nanofiber membrane is 20-80%; The carbon nanofibers in the composite fiber membrane have a diameter of 100 - 600 nm, the fibers have a porous structure, and the specific surface area is 80 - 450 m 2 / g, and the metal elements are concentrated on the surface of the carbon nanofibers.

2. The high-entropy alloy carbon nanocomposite fiber membrane according to claim 1, characterized in that The metal oxides include zinc oxide and one or more of iron oxide, cobalt oxide, nickel oxide, magnesium oxide, manganese oxide, manganese suboxide, and copper oxide.

3. The high-entropy alloy carbon nano-composite fiber membrane according to claim 1, characterized in that, The metal elements include at least six metal elements: zinc, iron, cobalt, nickel, magnesium, and manganese.

4. A method for preparing a high-entropy alloy carbon nano composite fiber membrane, characterized in that, It includes at least the following steps: Step 1: Add metal salts and / or metal oxide precursors to N,N-dimethylformamide solvent and stir to dissolve to obtain a metal salt precursor dispersion; Step 2: Add polyacrylonitrile to the precursor dispersion prepared in Step 1, heat and stir to obtain a composite fiber membrane spinning solution; Step 3: Electrospun the spinning solution obtained in Step 2 to prepare a composite fiber membrane; Step 4: Pre-oxidize the composite fiber membrane obtained in Step 3, and then perform carbonization treatment in an inert gas to obtain the high-entropy alloy carbon nanocomposite fiber membrane.

5. The preparation method of the carbon nanocomposite fiber membrane according to claim 3, characterized in that, In the precursor dispersion in Step 1, the mass concentration of the metal salt and / or metal oxide precursor component is 5-20 wt%.

6. The preparation method of the carbon nanocomposite fiber membrane according to claim 3, characterized in that, In the metal oxides in Step 1, at least zinc oxide is included.

7. The preparation method of the carbon nano-composite fiber membrane according to claim 3, wherein The metal elements contained in the metal salts and / or metal oxides in Step 1 also include one or more of iron, cobalt, nickel, magnesium, manganese, and copper; the metal salts are selected from one or more of chlorides and their hydrates, acetates and their hydrates, sulfates and their hydrates, and nitrates and their hydrates.

8. The preparation method of the carbon nanocomposite fiber membrane according to claim 3, wherein In Step 2, the mass concentration of polyacrylonitrile in the precursor dispersion is 8-12%.

9. The preparation method of the carbon nano-composite fiber membrane according to claim 3, wherein, In some technical solutions of the present invention, in Step 3, the carbonization temperature is 800-1000 °C.

10. Application of a high-entropy alloy carbon nanocomposite fiber membrane in the field of combined heat and power generation.

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