Preparation method and application of flexible flower-like platinum / dendritic silver counter electrode

Abstract

The invention relates to the field of electrochemistry, and discloses a preparation method and application of a flexible flower-like platinum / dendritic silver counter electrode. The method comprises the following steps: firstly, carrying out self-assembly treatment on an ITO substrate; then platinum flowers and silver branches are sequentially deposited on the substrate through an electrochemical deposition method; and finally, the platinum flower and the silver branch are transferred to the PDMS substrate by using a semi-embedding technology to prepare the flexible counter electrode. According to the invention, the platinum flower and the silver branch are combined together for the first time, so that the platinum flower is partially exposed outside PDMS, and the silver branch is embedded in PDMS. The counter electrode prepared by the invention has excellent mechanical flexibility, acid and alkali resistance and conductivity. The prepared counter electrode shows high sensitivity during electrochemical catalysis of glucose and cane sugar and can be used for preparing a three-electrode integrated system with other flexible electrodes and performing ethanol catalysis, and a new thought and a new solution are provided for development of flexible electrochemical integrated devices.

Description

Technical Field

[0001] The present invention relates to the field of electrochemistry, specifically to the field of flexible electrode preparation, and provides a preparation method and application of a flexible flower-shaped platinum / dendritic silver counter electrode. Background Art

[0002] In the field of electrochemistry, the three-electrode system (working electrode, counter electrode, and reference electrode) is a core component of electrochemical sensors, energy conversion devices, and analytical detection equipment. Among them, the counter electrode, as an auxiliary electrode, mainly functions to provide a stable current path to ensure the efficient operation of electrochemical reactions. In recent years, counter electrode materials have been widely used in the fields of electrocatalysis, energy storage, and sensing, such as platinum-based electrodes and carbon-based electrodes. Platinum-based electrodes are widely used in high-precision electrochemical sensors and fuel cell fields due to their excellent electrical conductivity and chemical stability. However, traditional platinum-based electrodes usually have a rigid structure and are difficult to adapt to the dynamic deformation requirements of flexible electronic devices. Carbon-based electrodes (such as carbon nanotubes and graphene) have attracted attention due to their low cost and good flexibility, but they are prone to oxidation intercalation reactions in strong acid, strong base, or high-concentration electrolyte environments, resulting in the passivation of surface active sites and limiting their long-term stability.

[0003] In recent years, researchers have tried to improve the performance of platinum-based composite electrodes through composite material design, nanostructure optimization, etc. For example, by combining platinum with other conductive materials (such as carbon nanotubes and conductive polymers), the rigidity problem of platinum electrodes has been partially solved, but these electrodes are all used for working electrodes, rather than counter electrodes.

[0004] With the rapid development of flexible electronics technology, the research on counter electrode materials is gradually moving towards flexibility, high performance, and integration. However, there are still the following key problems: Limitations in material performance: Although platinum-based electrodes have high electrical conductivity and chemical stability, their rigid structure is difficult to adapt to the dynamic deformation requirements of flexible electronic devices; carbon-based electrodes have low cost, but their stability is poor in strong acid and strong base environments. Integration challenges: Traditional rigid electrodes cannot be efficiently integrated with flexible electronic components, limiting the overall performance of flexible electrochemical systems. Summary of the Invention

[0005] In order to overcome the deficiencies of traditional counter electrode materials, the present invention provides a preparation method and application of a flexible flower-shaped platinum / dendritic silver counter electrode. The prepared flexible counter electrode has excellent mechanical flexibility, corrosion resistance, and electrical conductivity, and can be used for electrocatalysis.

[0006] The present invention combines flower-shaped platinum and dendritic silver for the first time to form a flexible counter electrode with both electrical conductivity and stability. The specific innovation points are as follows:

[0007] Structural innovation: Adopting a semi-embedded structure design, the flower-shaped platinum is exposed on the surface to enhance chemical stability, while the dendritic silver is embedded inside the PDMS to maintain high conductivity, achieving a perfect combination of flexibility and performance.

[0008] Material optimization: Through the collaborative design of surface modification of nano platinum flowers and the conductive network of internal silver branches, the conductivity and chemical stability of the electrode are greatly improved.

[0009] Application innovation: This flexible counter electrode is applicable to flexible integration fields, such as flexible sensors, wearable devices, and bio-integrated electronic systems, providing key material support for the development of electrochemical devices towards miniaturization and intelligence.

[0010] Through the above innovations, the present invention solves the problems of insufficient performance and difficult integration of flexible counter electrodes in the prior art, and provides a new solution for the development of flexible electrochemical integrated devices.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A preparation method of a flexible flower-shaped platinum / dendritic silver counter electrode, comprising the following steps:

[0013] Step 1. Self-assembly of the ITO substrate: The cleaned ITO substrate is successively immersed in cationic polymer and anionic polymer solutions with concentrations of 3-30 mg / mL, and after immersion, it is washed with ultrapure water and dried with nitrogen.

[0014] Step 2. Chronoamperometric deposition of Pt flowers: Using the self-assembled ITO substrate above as the working electrode, a saturated calomel electrode as the reference electrode, and a platinum sheet as the counter electrode, a three-electrode system of the CHI660E electrochemical system is used for the deposition reaction. The electrode is placed in a mixed solution containing 5-50 mM K 2 PtCl 4 、50-500 mM H 2 SO 4 and 50-500 mM K 2 SO 4 , and nano Pt flowers are deposited by chronoamperometry to obtain a Pt / ITO electrode.

[0015] Step 3. Chronoamperometric deposition of Ag branches: Using the Pt / ITO electrode prepared above as the working electrode, a saturated calomel electrode as the reference electrode, and a platinum sheet as the counter electrode, a three-electrode system of the CHI660E electrochemical system is used for the deposition reaction. The electrode is placed in a mixed solution containing 10-100 mM AgNO 3 and 0.1-10 M NaNO 3 , and nano Ag branches are deposited by chronoamperometry to obtain an AgPt / ITO electrode.

[0016] Step 4. Transfer the Pt flower and Ag branches to PDMS by semi-embedding technology: Immerse the prepared AgPt / ITO electrode in PDMS. After degassing by vacuum pumping, vacuum drying, and heat curing, peel the PDMS from the ITO to obtain the flexible dendritic AgPt / PDMS counter electrode.

[0017] Furthermore, the cleaning operation in Step 1 is as follows: Ultrasonically clean the ITO substrate with ultrapure water, acetone, and ethanol in sequence for 1 - 10 hours, dry it with nitrogen, and then place it in an ozone cleaner for cleaning for 1 - 10 hours.

[0018] Preferably, in Step 1, each immersion lasts for 10 - 100 minutes, and after cleaning with ultrapure water, it is dried with nitrogen and repeated six times.

[0019] Furthermore, the cationic polymer in Step 1 is polyethyleneimine (PEI) or PDDA.

[0020] Furthermore, the anionic polymer in Step 1 is polyacrylamide (PAA) or PSS.

[0021] Furthermore, the conditions of the chronoamperometry in Step 2 are: the constant potential is -0.3 to -0.03 V, and the deposition time is 4000 - 40000 s.

[0022] Furthermore, the conditions of the chronoamperometry in Step 3 are: the constant potential is -0.6 to -0.06 V, and the deposition time is 1000 - 10000 s.

[0023] Furthermore, in Step 4, use a vacuum drying oven to heat and cure at 60°C - 100°C for 1 - 10 hours.

[0024] The present invention also protects the application of a flexible flower-shaped platinum / dendritic silver counter electrode in the electrocatalysis of glucose. Using the prepared flexible flower-shaped platinum / dendritic silver electrode as the counter electrode, glucose is catalyzed by cyclic voltammetry. The results show that the oxidation peak shape of the counter electrode prepared by the present invention is the same as that of the traditional platinum electrode, but the oxidation peak is higher, indicating that this flexible counter electrode can be used in the field of electrocatalysis.

[0025] The present invention also protects the application of a flexible flower-shaped platinum / dendritic silver counter electrode in the electrocatalysis of sucrose. Using the prepared flexible flower-shaped platinum / dendritic silver electrode as the counter electrode, sucrose is catalyzed by cyclic voltammetry. The results show that the oxidation peak shape of the counter electrode prepared by the present invention is the same as that of the traditional platinum electrode, but the oxidation peak is higher, indicating that this flexible counter electrode can be used in the field of electrocatalysis.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] The present invention is a structural innovation: the counter electrode adopts a new semi-embedded structure, which is different from the traditional rigid counter electrode, has the advantage of flexibility, can better adapt to complex application scenarios, and expands the scope of use of the electrochemical counter electrode.

[0028] The present invention has the advantage of improved performance: through the composite structure design of nano-platinum flowers on the surface and silver branches with good conductivity inside, the conductivity of the electrode is greatly improved, and the overall performance of the electrode is improved. Pt flowers usually present a tree-like or flower-like structure with three-dimensional branches, with multiple branches and secondary branches, resembling petals or branches. Ag branches usually present a linear or branch-like structure, similar to the branches of tree branches, with a long trunk and branches. The morphology of the two is completely different. The electron microscope drawings of Pt flowers and Ag branches can more intuitively reflect the morphological difference between the two. The morphological difference between flower-like platinum and branch-like silver is the result of the combined effect of the type of precious metal and the deposition conditions: the high surface energy and three-dimensional nucleation characteristics of platinum, combined with a lower deposition potential and a longer deposition time, prompt it to form a flower-like structure. The low surface energy and one-dimensional growth characteristics of silver, combined with a higher deposition potential and a shorter deposition time, prompt it to form a branch-like structure.

[0029] The present invention embodies the characteristics of material optimization: silver is used internally, which significantly improves the conductivity while having little impact on the overall electrode material, thereby ensuring the stability of the electrode's performance in other aspects and achieving efficient utilization of material performance.

[0030] The present invention has the characteristic of composite structure assisting integration: the composite structure composed of nano-platinum flowers and silver branches not only has excellent conductivity, but also has good compatibility. During the integration process, it can be stably combined with other materials or components, effectively avoiding integration problems caused by material mismatch and ensuring the stable operation of the integrated system.

[0031] The present invention has outstanding integration advantages: traditional rigid counter electrodes cannot be integrated, while the flexible counter electrode of the present invention, with its bendable and deformable properties, can flexibly adapt to various complex shapes and narrow spaces, making it possible to integrate with other electronic components, and effectively promoting the development of electrochemical equipment towards miniaturization and integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is the SEM morphology of the Pt / ITO electrode;

[0033] Figure 2 is the SEM morphology of the AgPt / ITO electrode;

[0034] Figure 3 This is the SEM morphology of the flexible flower-like platinum / dendritic silver counter electrode;

[0035] Figure 4XRD pattern of the flexible flower-like platinum / dendritic silver counter electrode;

[0036] Figure 5 Resistance change diagram of the flexible flower-like platinum / dendritic silver counter electrode under different stretching degrees;

[0037] Figure 6 Resistance change diagram of the flexible flower-like platinum / dendritic silver counter electrode under different bending times;

[0038] Figure 7 Resistance change diagram of the flexible flower-like platinum / dendritic silver counter electrode in ethanol and tap water;

[0039] Figure 8 OCP test diagram of the flexible flower-like platinum / dendritic silver counter electrode in 1M H 2 SO 4 ;

[0040] Figure 9 OCP test diagram of the flexible flower-like platinum / dendritic silver counter electrode in 1M PBS;

[0041] Figure 10 OCP test diagram of the flexible flower-like platinum / dendritic silver counter electrode in 1M NaOH;

[0042] Figure 11 Performance comparison diagram of the flexible flower-like platinum / dendritic silver counter electrode and other commercial counter electrodes in glucose catalytic oxidation;

[0043] Figure 12 Performance comparison diagram of the flexible flower-like platinum / dendritic silver counter electrode and other commercial counter electrodes in sucrose catalytic oxidation;

[0044] Figure 13 Schematic diagram of the application of the flexible flower-like platinum / dendritic silver counter electrode in a three-electrode integrated device;

[0045] Figure 14 CV diagram of the flexible flower-like platinum / dendritic silver counter electrode for ethanol electrocatalysis in a three-electrode integrated device. Detailed implementation method

[0046] The technical solutions of the present invention will be further described below in conjunction with the embodiments, but the present invention is not limited to the content of the embodiments in any form. The experimental methods described in the embodiments are all conventional methods unless otherwise specified; the experimental reagents and materials can be obtained from commercial channels unless otherwise specified.

[0047] Embodiment 1 Preparation method of the flexible flower-like platinum / dendritic silver counter electrode

[0048] The specific steps are as follows:

[0049] Step 1 Self-assembly of ITO substrate: The ITO substrate was successively ultrasonically cleaned with ultrapure water, acetone, and ethanol for 1 hour, dried with nitrogen, and then placed in an ozone cleaner for 1 hour. The cleaned ITO substrate was successively immersed in solutions of polyethyleneimine (PEI) and polyacrylamide (PAA) with a concentration of 3 mg / mL, each immersion for 10 min, washed with ultrapure water, and dried with nitrogen. This was repeated six times to obtain the self-assembled ITO substrate.

[0050] Step 2 Chronoamperometric deposition of Pt flowers: Using the self-assembled ITO substrate above as the working electrode, a saturated calomel electrode as the reference electrode, and a platinum sheet as the counter electrode, a three-electrode system of the CHI660E electrochemical system was used for the deposition reaction. The electrodes were placed in a mixed solution containing 5 mM K 2 PtCl 4 , 50 mM H 2 SO 4 and 50 mM K 2 SO 4 . The constant potential was set to -0.3 V, and the deposition time was 4000 s. Nano Pt flowers were deposited by chronoamperometry to prepare a Pt / ITO electrode.

[0051] Step 3 Chronoamperometric deposition of Ag branches: Using the Pt / ITO electrode prepared above as the working electrode, a saturated calomel electrode as the reference electrode, and a platinum sheet as the counter electrode, a three-electrode system of the CHI660E electrochemical system was used for the deposition reaction. The electrodes were placed in a mixed solution containing 10 mM AgNO 3 and 0.1 M NaNO 3 . The constant potential was set to -0.6 V, and the deposition time was 1000 s. Nano Ag branches were deposited by chronoamperometry to prepare an AgPt / ITO electrode.

[0052] Step 4 Transfer of Pt flowers and Ag branches to PDMS by semi-embedding technique: The prepared AgPt / ITO electrode above was immersed in PDMS. After degassing by vacuum pumping and curing at 100 °C for 1 hour using a vacuum drying oven, the PDMS was peeled off from the ITO. Thus, a flexible branched AgPt / PDMS counter electrode was obtained.

[0053] The morphology of the flexible flower-shaped platinum / branched silver counter electrode prepared in Example 1 was observed by scanning electron microscopy (SEM). As shown in the appendix Figure 1 , it can be seen from the figure that the silver branches are completely embedded in the inner layer of PDMS, while a part of the nano Pt flowers is embedded in the inner layer and a part is exposed on the surface of PDMS. X-ray diffraction (XRD) was used to analyze the crystal structure of the electrode. As shown in the appendix Figure 2 , characteristic diffraction peaks of silver and platinum appear in the figure, proving the elemental composition of the material.

[0054] Example 2 Mechanical Flexibility Test of Flexible Flower-like Platinum / Branched Silver Counter Electrode

[0055] To evaluate the mechanical flexibility of the electrode, tensile and bending tests were carried out on it. As shown in the appendix Figure 3 As shown, when the electrode was successively stretched to 125%, 150%, 175% and 200% of its initial length, the change in resistance was not obvious, and R / R 0 was only 1.22, indicating good tensile conductivity. At the same time, after the electrode was bent 180° and subjected to 100, 200, 300, 400, 500 and 1000 bends, as shown in the appendix Figure 4 As shown, the change in resistance was still not significant, and R / R 0 was only 1.23, fully confirming its excellent mechanical properties.

[0056] Example 3 Corrosion Resistance Test of Flexible Flower-like Platinum / Branched Silver Counter Electrode

[0057] To evaluate the corrosion resistance of the electrode, it was placed in ethanol and tap water, and the resistance was measured after 1 day, 10 days, 20 days and 30 days respectively. The appendix Figure 5 shows that the change in resistance was small, R / R 0 was less than 1.10, and the morphology of the electrode remained basically unchanged, indicating good corrosion resistance and stability in complex environments.

[0058] Example 4 Electrochemical Stability Test of Flexible Flower-like Platinum / Branched Silver Counter Electrode

[0059] Using the open circuit potential method, the OCP test of the flower-like platinum / branched silver counter electrode was carried out for 15000 s under the conditions of 1M H 2 SO 4 , 1M PBS, 1M NaOH. The results are shown in the appendix Figure 6 , 7 , 8. The test shows that the open circuit potential of the flower-like platinum / branched silver counter electrode remains stable in different electrolytes, indicating good chemical stability in a variety of electrochemical environments.

[0060] Comparative Example 1 Performance Comparison of Flexible Flower-like Platinum / Branched Silver Counter Electrode and Other Commercial Counter Electrodes in Glucose Catalytic Oxidation

[0061] Using the PdAu-AgNWs electrode as the working electrode (WE), and the counter electrode (CE) corresponding to the Pt wire, Pt sheet, and the prepared flower-like platinum / branched silver electrode respectively, cyclic voltammetry was used to catalyze 30 mM glucose. As shown in the appendix Figure 9 As shown, the peak shapes of the electrocatalytic oxidation of the CV curves are the same, but the oxidation peak using the flower-like platinum / branched silver electrode as the counter electrode is higher, indicating its more excellent electrocatalytic performance, superior to the traditional commercial platinum electrode.

[0062] Performance Comparison of Flexible Flower-like Platinum / Branched Silver Counter Electrode with Other Commercial Counter Electrodes in Sucrose Catalytic Oxidation

[0063] Using the PtNiAu / ITO electrode as the working electrode (WE), and the counter electrode (CE) corresponding to a Pt wire, a Pt sheet, and the prepared flower-like platinum / branched silver electrode respectively, cyclic voltammetry was used to catalyze the oxidation of 0.9 M sucrose. As shown in the appendix Figure 10 As shown, the peak shapes of the electrocatalytic oxidation can also be seen to be consistent in the CV curves. However, the oxidation peak of the prepared flower-like platinum / branched silver electrode as the counter electrode is higher, further demonstrating its advantages in the field of electrocatalysis.

[0064] When depositing the flower-like platinum alone without the branched silver, the conductivity of the electrode is very poor; while when depositing the silver branches alone, the stability of the electrode is very poor. The deposition order of the Pt flower and the Ag branches cannot be reversed. Because only in this way can the Ag branches be embedded in the PDMS after the operation in step four. The Ag branches have excellent conductivity, and since Ag is exposed outside the PDMS and is easily oxidized, it is suitable as the internal structure. The Pt flower has high chemical stability and catalytic activity and is suitable as the surface structure, so it is exposed on the surface of the PDMS. If the order is reversed, the above effects cannot be achieved.

[0065] Application Example 1 Application of Flexible Flower-like Platinum / Branched Silver Counter Electrode in a Three-electrode Integrated Device

[0066] Integrate the Dendritic-Ag / AgCl electrode as the reference electrode (RE), the prepared flexible flower-like platinum / branched silver electrode as the counter electrode (CE), and the Au-AgNWs electrode as the working electrode (WE) into a three-electrode integrated device, as shown in the appendix Figure 11 As shown. The cyclic voltammetry was used to test the performance of the integrated device in ethanol electrocatalysis. As shown in the appendix Figure 12 As shown, the integrated device shows good electrochemical response in ethanol electrocatalysis, and an oxidation peak of ethanol appears at a potential of 0.45 V, indicating that the flexible flower-like platinum / branched silver counter electrode has excellent electrocatalytic performance in the three-electrode integrated device and can meet the requirements of practical applications.

[0067] The flexible counter electrode proposed by the present invention achieves multi-dimensional performance breakthroughs through systematic innovation. Its core innovation lies in constructing a novel semi-embedded composite structure, which breaks through the geometric form limitations of traditional rigid electrodes. Through the collaborative design of the surface modification of nano-platinum flowers and the internal silver-branch conductive network, while ensuring the flexibility of the electrode, an exponential improvement in electrical conductivity is achieved. At the material science level, a highly ductile silver matrix is used internally, which not only maintains the overall mechanical stability of the electrode but also ensures the electron transport efficiency through the excellent electrical conductivity of silver, realizing the efficient utilization of material functions. This composite structure exhibits excellent interfacial compatibility. The three-dimensional interconnected network formed by the nano-platinum flower surface layer can form stable chemical bonds with other functional materials, effectively solving the interfacial mismatch problem during the integration of heterogeneous materials. In the dimension of system integration, the bendable characteristics of the flexible electrode enable it to adapt to complex three-dimensional curved surfaces. Combined with the modular design architecture, it provides a material basis for constructing a highly integrated electrochemical sensing system, significantly promoting the evolution process of electrochemical devices towards miniaturization and intelligence.

[0068] The above content is only a preferred embodiment of the present invention, and it cannot be used to limit the protection scope of the present invention. Any equivalent substitution or change made by those skilled in the art within the technical scope disclosed by the present invention according to its technical solution and inventive concept should be covered within the protection scope of the present invention.

Claims

1. A flexible flower-shaped platinum / dendritic silver counter electrode, characterized in that: It includes a PDMS flexible substrate, a nano-platinum flower structure exposed on the surface, and a silver branch-like structure embedded in the PDMS. The nano-platinum flower structure is exposed on the PDMS surface to ensure the stability of the electrode, and the silver branch-like structure is completely embedded in the PDMS to maintain the conductivity of the electrode. Therefore, the electrode has both stability and conductivity.

2. A method for preparing a flexible flower-like platinum / dendritic silver counter electrode, characterized in that: The following steps are involved: Step 1. Self-assembly of ITO substrate: soak the cleaned ITO substrate in a cationic polymer solution and an anionic polymer solution with a concentration of 3-30 mg / mL, wash with ultrapure water and blow dry with nitrogen gas; Step 2. Depositing Pt flowers by chronoamperometry: The self-assembled ITO substrate is used as the working electrode, the saturated calomel electrode is used as the reference electrode, and the platinum sheet is used as the counter electrode. The deposition reaction is carried out by using the three-electrode system of the CHI660E electrochemical system. The electrode is placed in a mixed solution containing 5-50 mM K2PtCl4, 50-500 mM H2SO4 and 50-500 mM K2SO4, and nano Pt flowers are deposited by chronoamperometry to obtain a Pt / ITO electrode. Step 3. Deposition of Ag branches by chronoamperometry: The prepared Pt / ITO electrode is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a platinum sheet is used as a counter electrode. A deposition reaction is performed using a three-electrode system of a CHI660E electrochemical system. The electrode is placed in a mixed solution containing 10-100 mM AgNO3 and 0.1-10 M NaNO3, and nano-Ag branches are deposited by chronoamperometry to obtain an AgPt / ITO electrode. Step 4. Transfer the Pt flower and Ag branch to PDMS using the semi-embedded technology: Immerse the AgPt / ITO electrode prepared above into PDMS, and after vacuum degassing, vacuum drying, heating and curing, peel off the PDMS and ITO to obtain a flexible branch-like AgPt / PDMS counter electrode.

3. The method for preparing the flexible flower-like platinum / dendritic silver counter electrode according to claim 2, characterized in that: The cleaning operation in step 1 is as follows: ultrasonically clean the ITO substrate with ultrapure water, acetone, and ethanol for 1 to 10 hours, blow dry with nitrogen, and then place it in an ozone cleaning machine for cleaning for 1 to 10 hours.

4. The method for preparing the flexible flower-like platinum / dendritic silver counter electrode according to claim 2, characterized in that: Step 1: Soak for 10 to 100 minutes each time, rinse with ultrapure water and blow dry with nitrogen, and repeat six times.

5. The method for preparing the flexible flower-like platinum / dendritic silver counter electrode according to claim 2, characterized in that: Step 1 The cationic polymer is polyethyleneimine (PEI) or PDDA.

6. The method for preparing the flexible flower-like platinum / dendritic silver counter electrode according to claim 2, characterized in that: Step 1: The anionic polymer is polyacrylamide (PAA) or PSS.

7. The method for preparing the flexible flower-like platinum / dendritic silver counter electrode according to claim 2, characterized in that: The conditions of the chronoamperometry in step 2 are: constant potential of -0.3 to -0.03 V, and deposition time of 4000 to 40000 s.

8. The method for preparing the flexible flower-like platinum / dendritic silver counter electrode according to claim 2, characterized in that: The conditions of the chronoamperometry in step 3 are: constant potential of -0.6 to -0.06 V, and deposition time of 1000 to 10000 s.

9. The method for preparing the flexible flower-like platinum / dendritic silver counter electrode according to claim 2, characterized in that: Step 4: Use a vacuum drying oven to heat and cure at 60° C. to 100° C. for 1 to 10 hours.

10. An application of a flexible flower-shaped platinum / dendritic silver counter electrode, characterized in that: It is characterized in that Application of electrodes in electrocatalysis of glucose, sucrose and ethanol.

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