Fe-co-ni-cu-zn high-entropy sensing material and preparation method therefor, sensing electrode and use thereof

Abstract

Provided in the present invention is a preparation method for an Fe-Co-Ni-Cu-Zn high-entropy sensing material. The Fe-Co-Ni-Cu-Zn high-entropy sensing material is obtained by preparing an electroplating solution, adjusting the concentration and pH value of an electrolyte, and preparing a sensitive material from Fe, Co, Ni, Cu and Zn by means of an electrochemical method. The preparation method is simple and convenient to operate, and relatively low in terms of cost and energy consumption; and the elemental composition, structural morphology, performance, etc., of the high-entropy alloy can be easily controlled by changing the deposition parameters (time, temperature, etc.) of electrochemical deposition. The Fe-Co-Ni-Cu-Zn high-entropy sensing material prepared in the present application can be used as a sensing electrode to test urea and glucose solutions having different concentrations, and has high detection precision, good stability and high sensitivity.

Description

Fe-Co-Ni-Cu-Zn high-entropy sensing material, preparation method, sensing electrode and application thereof Technical Field

[0001] The present application relates to the field of material detection technology, and in particular to a preparation method of a Fe-Co-Ni-Cu-Zn high-entropy sensing material, a Fe-Co-Ni-Cu-Zn high-entropy sensing material and applications thereof. Background Art

[0002] Detection materials are crucial for electrochemical sensing. Current detection materials suffer from low accuracy, poor stability, and low zero-degree sensitivity. Furthermore, it's difficult to simultaneously detect both glucose and urea using the same electrode material. The development of novel detection materials for biochemical sensors is urgently needed.

[0003] High-entropy alloys are solid solution alloy materials composed of five or more metal elements in equiatomic or non-equiatomic ratios. Due to the difference in their structure from traditional alloys, high-entropy alloys have the following unique effects: high-entropy effect, lattice distortion effect, hysteresis diffusion effect and "cocktail effect", which also enable them to obtain many attractive properties, such as mechanical properties, corrosion resistance, unique electromagnetic properties, etc.

[0004] At present, the preparation methods of high entropy alloys mainly include physical methods such as arc induction melting, thermal spraying, laser cladding, and mechanical die casting. The experimental operation process of the existing methods is difficult, the processing route is complex, and the control effect is limited. Using electrochemical deposition to control high entropy alloys is a low-cost and simple preparation method. Compared with other control methods, it can control the element ratio and chemical composition of HEA on substrates with complex geometric shapes. It is easy to operate, has low processing environment requirements, does not require complex equipment and expensive raw materials, and provides great convenience for engineering applications. In addition, electrochemical deposition can easily control the element composition, microstructure and performance of high entropy alloys by changing the deposition parameters (time, temperature, etc.). Therefore, it is possible to control the microstructure and performance of high entropy alloys by adjusting the electrochemical deposition parameters.

[0005] Summary of the Invention

[0006] In view of this, it is necessary to provide a preparation method of Fe-Co-Ni-Cu-Zn high-entropy sensing material, Fe-Co-Ni-Cu-Zn high-entropy sensing material, sensing material and its application that are simple to operate, low cost and low energy consumption and can be controlled to address the defects in the existing technology.

[0007] To solve the above problems, this application adopts the following technical solutions:

[0008] One of the purposes of this application is to provide a method for preparing a Fe-Co-Ni-Cu-Zn high entropy sensing material, comprising the following steps:

[0009] Prepare an electrolyte solution, wherein the electroplating solution includes the following components: soluble iron salt, cobalt salt, nickel salt, copper salt, zinc salt, complexing agent, buffer, reducing agent and additional salt;

[0010] Adjusting the concentration and pH value of the electrolyte;

[0011] The adjusted electrolyte is electroplated to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material.

[0012] In some embodiments, in the step of preparing the electrolyte, the soluble iron salt includes ferrous sulfate, the cobalt salt includes cobalt sulfate, the nickel salt includes nickel sulfate, the copper salt includes copper sulfate, and the zinc salt includes zinc sulfate; the chelating agent includes but is not limited to citric acid or trisodium citrate; the buffer includes but is not limited to boric acid; the reducing agent includes but is not limited to sodium hypophosphite; and the additional salt includes but is not limited to potassium chloride.

[0013] In some embodiments, the step of preparing the electrolyte specifically includes the following steps:

[0014] First, deionized water is heated and maintained at a temperature of 20° C.-90° C., and then the complexing agent, the buffer, and the additional salt are added in sequence and stirred until dissolved. Then, the soluble iron salt, the cobalt salt, the nickel salt, the copper salt, the zinc salt, and the reducing agent are added and stirred until dissolved. After aging for 0.2-8 hours, the electrolyte is obtained.

[0015] In some embodiments, the step of adjusting the concentration and pH value of the electrolyte specifically includes the following steps:

[0016] A strong acid solution is added to the electrolyte, and the concentration and pH value of the electrolyte are adjusted to make the pH value of the electrolyte 7.0-8.5.

[0017] In some embodiments, the contents of the electroplating solution components are as follows: ferrous sulfate 5.0-200.0 g / L, cobalt sulfate 5.0-180.0 g / L, nickel sulfate 5.0-150 g / L, potassium chloride 5.0-100.0 g / L, copper sulfate 0.1-50.0 g / L, zinc sulfate 0.2-60.0 g / L, trisodium citrate 1.0-50.0 g / L, sodium hypophosphite 0.1-20 g / L, citric acid 10.0-200.0 g / L, and boric acid 2.0-80.0 g / L.

[0018] In some embodiments, the strong acidic solution includes but is not limited to sulfuric acid solution, hydrochloric acid solution or nitric acid solution, and the concentration of the sulfuric acid solution is 0.1-6 mol / L.

[0019] In some embodiments, the step of electroplating the adjusted electrolyte to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material specifically includes the following steps:

[0020] The Fe-Co-Ni-Cu-Zn high-entropy sensing material is obtained by using an electrode rod as an anode and a conductive substrate as a cathode and performing electroplating at a constant potential. The electroplating process has an electrodeposition potential range of -3.0-3.0 V, a deposition temperature of 30-80° C., and a deposition time range of 0.1-50 min.

[0021] In some embodiments, the conductive substrate includes but is not limited to titanium, copper, and silver; the electrode rod includes but is not limited to a millstone rod, lead, titanium, and platinum.

[0022] In some embodiments, the conductive substrate further includes a pretreatment step before use, wherein the pretreatment includes first polishing the conductive substrate with sandpaper, then ultrasonically treating it for 5-20 minutes, then soaking it in a 0.5-2 mol / L sulfuric acid solution for 0.5-8 hours, and then rinsing it with pure water and ethanol in sequence, and drying it.

[0023] In some embodiments, the ratio of each metal element in the Fe-Co-Ni-Cu-Zn high entropy sensing material is between 1% and 50%.

[0024] The second purpose of this application is to provide a Fe-Co-Ni-Cu-Zn high entropy sensing material, which is prepared by the preparation method of the Fe-Co-Ni-Cu-Zn high entropy sensing material.

[0025] The third object of this application is to provide a sensing electrode comprising the Fe-Co-Ni-Cu-Zn high entropy sensing material.

[0026] The fourth purpose of this application is to provide an application of the above-mentioned sensing electrode in detecting the concentration of urea and glucose.

[0027] In some embodiments, the detection concentration range of urea is 0.2-1.4 mM, and the detection concentration range of glucose is 0.1-0.5 mM.

[0028] This application adopts the above technical solution, and its beneficial effects are as follows:

[0029] The present invention proposes a preparation method of an Fe-Co-Ni-Cu-Zn high-entropy sensing material. By preparing an electroplating solution, adjusting the electrolyte concentration and pH value, and preparing sensitive materials for Fe, Co, Ni, Cu, and Zn elements through an electrochemical method, the Fe-Co-Ni-Cu-Zn high-entropy sensing material is obtained. The above preparation method is simple to operate, with low cost and energy consumption. By changing the deposition parameters (time, temperature, etc.) through electrochemical deposition, the elemental composition, microstructure, and performance of the high-entropy alloy can be easily controlled. The Fe-Co-Ni-Cu-Zn high-entropy sensing material prepared in the present application can be used as a sensing electrode to test urea and glucose solutions of different concentrations, with high detection accuracy, good stability, and high zero-degree sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 is a flow chart of the steps of the method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material provided in an embodiment of the present application.

[0032] FIG2 is a SEM and element distribution diagram of the high entropy electrode material provided in Example 1 of the present application.

[0033] FIG3 is an electrochemical scanning curve at different common sugar concentrations provided in Example 5 of the present application.

[0034] FIG4 is an electrochemical scanning curve at different common sugar concentrations provided in Example 6 of the present application. DETAILED DESCRIPTION

[0035] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0036] In the description of this application, it should be understood that the terms "upper", "lower", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0038] In order to make the purpose, technical solutions and advantages of this application more clear, this application is further described in detail below with reference to the accompanying drawings and embodiments.

[0039] Please refer to Figure 1, which is a flow chart of the steps of the preparation method of the Fe-Co-Ni-Cu-Zn high entropy sensing material provided in this application, including the following steps S110 to S130. The implementation method of each step is described in detail below.

[0040] Step S110: preparing an electrolyte, wherein the electroplating solution includes the following components: soluble iron salt, cobalt salt, nickel salt, copper salt, zinc salt, complexing agent, buffer, reducing agent and additional salt.

[0041] In this embodiment, the step of preparing the electrolyte specifically includes the following steps:

[0042] First, deionized water is heated and maintained at a temperature of 20° C.-90° C., and then the complexing agent, the buffer, and the additional salt are added in sequence and stirred until dissolved. Then, the soluble iron salt, the cobalt salt, the nickel salt, the copper salt, the zinc salt, and the reducing agent are added and stirred until dissolved. After aging for 0.2-8 hours, the electrolyte is obtained.

[0043] In this embodiment, the soluble iron salt includes ferrous sulfate, the cobalt salt includes cobalt sulfate, the nickel salt includes nickel sulfate, the copper salt includes copper sulfate, and the zinc salt includes zinc sulfate; the chelating agent includes but is not limited to citric acid or trisodium citrate; the buffer includes but is not limited to boric acid; the reducing agent includes but is not limited to sodium hypophosphite; and the additional salt includes but is not limited to potassium chloride.

[0044] Furthermore, the components of the electroplating solution are as follows: 5.0-200.0 g / L of ferrous sulfate, 5.0-180.0 g / L of cobalt sulfate, 5.0-150 g / L of nickel sulfate, 5.0-100.0 g / L of potassium chloride, 0.1-50.0 g / L of copper sulfate, 0.2-60.0 g / L of zinc sulfate, 1.0-50.0 g / L of trisodium citrate, 0.1-20 g / L of sodium hypophosphite, 10.0-200.0 g / L of citric acid, and 2.0-80.0 g / L of boric acid.

[0045] Step S120: adjusting the concentration and pH value of the electrolyte.

[0046] In this embodiment, the step of adjusting the concentration and pH value of the electrolyte specifically includes the following steps: adding a strong acid solution to the electrolyte, adjusting the concentration and pH value of the electrolyte, and making the pH value of the electrolyte 7.0-8.5.

[0047] Furthermore, the strong acid solution includes but is not limited to sulfuric acid solution, hydrochloric acid solution or nitric acid solution, and the concentration of the sulfuric acid solution is 0.1-6 mol / L.

[0048] It can be understood that by adding an appropriate amount of strong acid solution to the electroplating solution, the concentration and pH value of the electroplating solution can be adjusted to better meet the subsequent preparation requirements of Fe-Co-Ni-Cu-Zn high entropy sensing materials.

[0049] Step S130: performing electroplating on the adjusted electrolyte to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material.

[0050] In this embodiment, the step of electroplating the adjusted electrolyte to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material specifically includes the following steps: using an electrode rod as an anode and a conductive substrate as a cathode, and performing electroplating at a constant potential to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material.

[0051] Furthermore, during the electroplating process, the electrodeposition potential ranges from -3.0 to 3.0 V, the deposition temperature ranges from 30 to 80° C., and the deposition time ranges from 0.1 to 50 min.

[0052] It can be understood that by changing the deposition parameters (time, temperature, etc.) through electrochemical deposition, the elemental composition, microstructure, and properties of high-entropy alloys can be easily controlled. Therefore, the adjustment of electrochemical deposition parameters provides the possibility of regulating the microstructure and properties of high-entropy alloys.

[0053] In this embodiment, the conductive substrate includes but is not limited to titanium, copper, and silver; the electrode rod includes but is not limited to a millstone rod, lead, titanium, and platinum.

[0054] Furthermore, the conductive substrate also includes a pretreatment step before use, the pretreatment comprising first polishing the conductive substrate with sandpaper, then ultrasonically treating it for 5-20 minutes, then soaking it in a 0.5-2 mol / L sulfuric acid solution for 0.5-8 hours, then rinsing it with pure water and ethanol in sequence, and drying it.

[0055] In this embodiment, the ratio of each metal element in the Fe-Co-Ni-Cu-Zn high entropy sensing material is between 1% and 50%.

[0056] The above embodiment of the present application provides a method for preparing a Fe-Co-Ni-Cu-Zn high-entropy sensing material. By preparing an electroplating solution, adjusting the electrolyte concentration and pH value, and preparing sensitive materials for Fe, Co, Ni, Cu, and Zn elements by an electrochemical method, Fe-Co-Ni-Cu-Zn high-entropy sensing material is obtained. The above preparation method is simple to operate, with low cost and energy consumption. By changing the deposition parameters (time, temperature, etc.) through electrochemical deposition, the elemental composition, microstructure, and performance of the high-entropy alloy can be easily controlled.

[0057] The Fe-Co-Ni-Cu-Zn high entropy sensing material prepared in this application can be used as a sensing electrode to test urea and glucose solutions of different concentrations.

[0058] In some embodiments, the detection concentration range of urea is 0.2-1.4 mM, and the detection concentration range of glucose is 0.1-0.5 mM.

[0059] The sensing electrode provided in the present application includes Fe-Co-Ni-Cu-Zn high-entropy sensing material, which can simultaneously detect glucose and urea with high detection accuracy, good stability and high zero-degree sensitivity.

[0060] The above technical solutions of the present application are described in detail below in conjunction with specific embodiments.

[0061] Example 1

[0062] Example 1 of the present application provides a preparation method of a Fe-Co-Ni-Cu-Zn high entropy sensing material, and the preparation method is as follows:

[0063] (1) First, deionized water is heated and maintained at a temperature of 20° C., and then citric acid, boric acid, and potassium chloride are added in sequence and stirred until dissolved. Then, ferrous sulfate, cobalt sulfate, nickel sulfate, copper sulfate, zinc sulfate, and sodium hypophosphite are added and stirred until dissolved. After aging for 0.2 h, the electrolyte is obtained.

[0064] (2) Adding a 0.1 mol / L sulfuric acid solution to the electrolyte to adjust the concentration and pH of the electrolyte to 7.0. The electrolyte contains: 5.0 g / L ferrous sulfate, 5.0 g / L cobalt sulfate, 5.0 g / L nickel sulfate, 5.0 g / L potassium chloride, 0.1 g / L copper sulfate, 0.2 g / L zinc sulfate, 0.1 g / L sodium hypophosphite, 10.0 g / L citric acid, and 2.0 g / L boric acid.

[0065] (3) A stone mill rod is used as an anode and titanium is used as a cathode, and a constant potential electroplating treatment is performed to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material, wherein the electrodeposition potential range during the electroplating process is -3.0 V, the deposition temperature is 30°C, and the deposition time range is 0.1 min.

[0066] Please refer to FIG2 , which is the SEM image and element distribution diagram provided in Example 1.

[0067] Example 2

[0068] Example 2 of the present application provides a preparation method of a Fe-Co-Ni-Cu-Zn high entropy sensing material, and the preparation method is as follows:

[0069] (1) First, deionized water is heated and maintained at a temperature of 90° C., and then trisodium citrate, boric acid, and potassium chloride are added in sequence and stirred until dissolved. Then, ferrous sulfate, cobalt sulfate, nickel sulfate, copper sulfate, zinc sulfate, and sodium hypophosphite are added and stirred until dissolved. After aging for 8 hours, the electrolyte is obtained.

[0070] (2) Adding 6 mol / L sulfuric acid solution to the above electrolyte, adjusting the concentration and pH value of the electrolyte to 7.5. The electrolyte contains: 200.0 g / L ferrous sulfate, 180.0 g / L cobalt sulfate, 150 g / L nickel sulfate, 100.0 g / L potassium chloride, 50.0 g / L copper sulfate, 60.0 g / L zinc sulfate, 1.0 g / L trisodium citrate, 20 g / L sodium hypophosphite, and 80.0 g / L boric acid.

[0071] (3) A stone mill rod is used as an anode and titanium is used as a cathode, and a constant potential electroplating treatment is performed to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material, wherein the electrodeposition potential range during the electroplating process is 3.0 V, the deposition temperature is 80° C., and the deposition time range is 50 min.

[0072] Example 3

[0073] Example 3 of the present application provides a preparation method of a Fe-Co-Ni-Cu-Zn high entropy sensing material, and the preparation method is as follows:

[0074] (1) First, deionized water is heated and maintained at a temperature of 50° C., and then trisodium citrate, boric acid, and potassium chloride are added in sequence and stirred until dissolved. Then, ferrous sulfate, cobalt sulfate, nickel sulfate, copper sulfate, zinc sulfate, and sodium hypophosphite are added and stirred until dissolved. After aging for 4 hours, the electrolyte is obtained.

[0075] (2) Add 3 mol / L sulfuric acid solution to the electrolyte to adjust the concentration and pH value of the electrolyte to 8.2. The electrolyte contains: 50.0 g / L ferrous sulfate, 80.0 g / L cobalt sulfate, 100 g / L nickel sulfate, 50.0 g / L potassium chloride, 20.0 g / L copper sulfate, 30.0 g / L zinc sulfate, 20.0 g / L trisodium citrate, 10 g / L sodium hypophosphite, and 40.0 g / L boric acid.

[0076] (3) A stone mill rod is used as an anode and titanium is used as a cathode, and a constant potential electroplating treatment is performed to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material, wherein the electrodeposition potential range during the electroplating process is 3.0 V, the deposition temperature is 80° C., and the deposition time range is 50 min.

[0077] Example 4

[0078] Example 3 of the present application provides a preparation method of a Fe-Co-Ni-Cu-Zn high entropy sensing material, and the preparation method is as follows:

[0079] (1) First, deionized water is heated and maintained at a temperature of 30° C., and then citric acid, boric acid, and potassium chloride are added in sequence and stirred until dissolved. Then, ferrous sulfate, cobalt sulfate, nickel sulfate, copper sulfate, zinc sulfate, and sodium hypophosphite are added and stirred until dissolved. After aging for 5 hours, the electrolyte is obtained.

[0080] (2) Adding 3 mol / L sulfuric acid solution to the electrolyte, adjusting the concentration and pH of the electrolyte to 8.5. The electrolyte contains: 40.0 g / L ferrous sulfate, 30.0 g / L cobalt sulfate, 10 g / L nickel sulfate, 20.0 g / L potassium chloride, 10.0 g / L copper sulfate, 20.0 g / L zinc sulfate, 50.0 g / L citric acid, 8 g / L sodium hypophosphite, and 20.0 g / L boric acid.

[0081] (3) A stone mill rod is used as an anode and titanium is used as a cathode, and a constant potential electroplating process is used to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material, wherein the electrodeposition potential range during the electroplating process is 2.0 V, the deposition temperature is 60° C., and the deposition time range is 30 min.

[0082] Table 1 shows the content of elements in Examples 1-4

[0083] Example 5

[0084] Potassium chloride was dissolved in 100 ml of deionized water to obtain a 0.1 M solution. Subsequently, different amounts of glucose were added to prepare solutions with concentrations ranging from 0.2 to 1.4 μM.

[0085] The high entropy electrode material was deposited on the surface of the working electrode by the method of Example 1 to prepare a high entropy electrode.

[0086] The high entropy electrode and the prepared Au-HEA electrode were scanned at a scan rate of 50 mV / s over a range of 0.2 V to 0.8 V. The oxidation peak within this range was identified, and a linear relationship was established using linear fitting. Figure 3 shows the electrochemical scan curves for different concentrations of common sugars, as provided in Example 5.

[0087] Example 6

[0088] Potassium chloride was dissolved in 100 ml of deionized water to obtain a 0.1 M solution. Subsequently, different amounts of glucose were added to prepare solutions with a concentration of 0.1 to 0.5 μM.

[0089] The high entropy electrode material was deposited on the surface of the working electrode by the method of Example 3 to prepare a high entropy electrode.

[0090] The high-entropy electrode and the prepared Au-HEA electrode were scanned at a scan rate of 50 mV / s over a range of -0.35 V to 0 V. The oxidation peak within this range was identified, and a linear relationship was established using linear fitting. Figure 4 shows the electrochemical scan curves for different concentrations of common sugars, as provided in Example 6.

[0091] It can be understood that the various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above are merely preferred embodiments of the present application and only specifically describe the technical principles of the present application. These descriptions are intended only to explain the principles of the present application and should not be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application, as well as other specific implementations of the present application that can be conceived by those skilled in the art without inventive effort, shall be included within the scope of protection of the present application.

Claims

1. A method for preparing a Fe-Co-Ni-Cu-Zn high entropy sensing material, characterized in that: The steps include: Prepare an electrolyte, wherein the electroplating solution includes the following components: soluble iron salt, cobalt salt, nickel salt, copper salt, zinc salt, complexing agent, buffer, reducing agent and additional salt; Adjusting the concentration and pH value of the electrolyte; The adjusted electrolyte is electroplated to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material.

2. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 1, characterized in that: In the step of configuring the electrolyte, the soluble iron salt includes ferrous sulfate, the cobalt salt includes cobalt sulfate, the nickel salt includes nickel sulfate, the copper salt includes copper sulfate, and the zinc salt includes zinc sulfate; the complexing agent includes but is not limited to citric acid or trisodium citrate; the buffer includes but is not limited to boric acid; the reducing agent includes but is not limited to sodium hypophosphite; and the additional salt includes but is not limited to potassium chloride.

3. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 1 or 2, characterized in that: The steps of preparing the electrolyte specifically include the following steps: First, deionized water is heated and maintained at a temperature of 20° C.-90° C., and then the complexing agent, the buffer, and the additional salt are added in sequence and stirred until dissolved, and then the soluble iron salt, the cobalt salt, the nickel salt, the copper salt, the zinc salt, and the reducing agent are added and stirred until dissolved, and after aging for 0.2-8 hours, the electrolyte is obtained.

4. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 2, characterized in that: The step of adjusting the concentration and pH value of the electrolyte specifically includes the following steps: A strong acid solution is added to the electrolyte, and the concentration and pH value of the electrolyte are adjusted to make the pH value of the electrolyte 7.0-8.

5.

5. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 4, characterized in that: The components of the electroplating solution are as follows: 5.0-200.0 g / L of ferrous sulfate, 5.0-180.0 g / L of cobalt sulfate, 5.0-150 g / L of nickel sulfate, 5.0-100.0 g / L of potassium chloride, 0.1-50.0 g / L of copper sulfate, 0.2-60.0 g / L of zinc sulfate, 1.0-50.0 g / L of trisodium citrate, 0.1-20 g / L of sodium hypophosphite, 10.0-200.0 g / L of citric acid, and 2.0-80.0 g / L of boric acid.

6. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 5, characterized in that: The strong acid solution includes but is not limited to sulfuric acid solution, hydrochloric acid solution or nitric acid solution, and the concentration of the sulfuric acid solution is 0.1-6 mol / L.

7. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 1, characterized in that: The step of electroplating the adjusted electrolyte to obtain the Fe-Co-Ni-Cu-Zn high entropy sensing material specifically includes the following steps: The Fe-Co-Ni-Cu-Zn high entropy sensing material is obtained by using an electrode rod as an anode and a conductive substrate as a cathode and performing electroplating at a constant potential, wherein the electrodeposition potential ranges from -3.0 to 3.0 V, the deposition temperature is 30 to 80° C., and the deposition time ranges from 0.1 to 50 min during the electroplating process.

8. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 7, characterized in that: The conductive substrate includes but is not limited to titanium, copper, and silver; the electrode rod includes but is not limited to stone mill rod, lead, titanium, and platinum.

9. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 8, characterized in that: The conductive substrate also includes a pretreatment step before use, which includes first polishing the conductive substrate with sandpaper, then ultrasonically treating it for 5-20 minutes, then soaking it in a 0.5-2 mol / L sulfuric acid solution for 0.5-8 hours, then washing it with pure water and ethanol in turn, and drying it.

10. The method for preparing the Fe-Co-Ni-Cu-Zn high entropy sensing material according to claim 1, characterized in that: The proportion of each metal element in the Fe-Co-Ni-Cu-Zn high entropy sensing material is between 1% and 50%.

11. A Fe-Co-Ni-Cu-Zn high entropy sensing material, characterized in that: It is prepared by the preparation method of the Fe-Co-Ni-Cu-Zn high entropy sensing material according to any one of claims 1 to 10.

12. A sensing electrode, characterized in that: Includes the Fe-Co-Ni-Cu-Zn high entropy sensing material as described in claim 11.

13. Use of the sensing electrode according to claim 12 in detecting the concentrations of urea and glucose.

14. Use of the sensing electrode according to claim 12 in detecting urea or glucose concentration, characterized in that: The detection concentration range of the urea is 0.2-1.4 mM, and the detection concentration range of the glucose is 0.1-0.5 mM.

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