Method for synthesizing MOF material from waste ternary lithium battery NCM811 and waste PET and application of MOF material

Abstract

The invention belongs to the technical field of recycling of waste lithium ion battery wastes and PET plastics, and particularly relates to a method for synthesizing an MOF material from a waste ternary lithium battery NCM811 and waste PET and application of the MOF material. The method comprises the following steps: mixing an eight-series ternary positive electrode material from the waste lithium ion battery, PET waste plastic and a solvent, and carrying out a heating reaction; after the reaction is completed, washing and drying are carried out to obtain an MOF material, the MOF material is compounded on the surface of foamed nickel (NF) to prepare an electrode, the electrode is used as a working electrode to form a three-electrode system, urea electrooxidation reaction or electrocatalytic hydrogen evolution reaction is carried out, and the catalyst has good electrocatalytic performance which is obviously superior to that of most existing non-noble metal catalysts and has good application prospects. And the catalyst has high activity and remarkable energy-saving and consumption-reducing potential. The method realizes efficient recovery and resource utilization of solid wastes, and has remarkable green and environment-friendly benefits and good economic and social benefits.

Description

Technical Field

[0001] This invention belongs to the field of waste battery and waste PET recycling technology, specifically involving a method for synthesizing MOF materials from waste ternary lithium battery NCM811 and waste PET, and its application. Background Technology

[0002] With the widespread application of lithium-ion batteries in electric vehicles, consumer electronics, and energy storage systems, the market demand for their core material—ternary cathode materials (such as lithium nickel cobalt manganese oxide, NCM)—continues to rise. Among them, octa-series ternary materials (such as NCM811), with their high nickel content (up to 80%), possess excellent energy density and long driving range, occupying an important position in high-energy-density battery systems. However, resources such as nickel and cobalt are scarce and expensive, and the disposal of batteries can cause serious environmental pollution.

[0003] Currently, the recycling of spent ternary lithium batteries is driven by multiple factors, including resource economics, environmental protection, policies and regulations, and market growth. Traditional processes face problems such as low efficiency and high pollution, while new recycling technologies, such as deep eutectic solvent combined with microwave-assisted leaching, are emerging, aiming to improve metal recovery rates and material regeneration purity, and promote the realization of green and sustainable battery systems. Against this backdrop, developing efficient, environmentally friendly, and economical recycling technologies, and exploring research on recycling and regeneration technologies for octet lithium-ion materials, is of great significance. Summary of the Invention

[0004] The purpose of this invention is to provide a green, environmentally friendly, and sustainable material synthesis method. By comprehensively utilizing two types of waste materials—waste PET and octet ternary lithium-ion battery materials—a metal-organic framework (MOF) material was successfully synthesized using an organic solvent method. This method not only achieves efficient recovery and reuse of metal elements and organic components from waste resources but also produces MOF functional materials with high added value, controllable structure, and excellent performance. The prepared MOFs not only avoid the dependence on high-purity commercial reagents in traditional synthesis, significantly reducing environmental impact and cost, but also exhibit excellent electrocatalytic performance—in the urea electro-oxidation reaction (UOR), this catalyst achieves a high efficiency of 10 mA cm⁻¹. -2 and 100 mA cm -2 The operating potential at the prepared catalyst was reduced by 54 mV and 71 mV compared to the original nickel foam, respectively, and its performance was also superior to typical Fe-LDH and Co-LDH catalysts. Importantly, in the alkaline water electrolysis coupled urea oxidation system, the thermodynamic potential of the conventional oxygen evolution reaction (OER) is 1.23 V, but it actually requires over 1.50 V to drive the reaction, while the theoretical potential required for UOR is even lower. Therefore, replacing the anolyte reaction with UOR significantly reduces the total system voltage. The prepared catalyst operates at 100 mA cm⁻¹. -2The UOR can be efficiently driven with only 1.403 V, meaning that up to 100–200 mV or even more cell voltage can be saved in actual electrolytic hydrogen production processes. On an industrial scale, for every 100 mV reduction in voltage, electrolysis energy consumption can be reduced by approximately 10–15%, corresponding to significant savings in electricity costs and reductions in carbon emissions. This invention effectively improves the resource utilization level of solid waste, promotes the high-value recycling process of waste materials, and has significant environmental and economic benefits. Furthermore, its low-voltage, high-efficiency operation significantly improves overall energy efficiency and economic feasibility.

[0005] The objective of this invention can be achieved through the following technical solution: terephthalic acid raw material is obtained by degrading PET waste plastic through a solvothermal method using organic reagents; then, the waste material of octetium-based ternary lithium-ion batteries is processed to provide a metal source for the synthesis of MOF materials; MOF materials are prepared by coating the surface of a nickel foam electrode as a working electrode; a three-electrode system is constructed using HgO / Hg as a reference electrode and a platinum sheet electrode as a counter electrode in an H-type electrolytic cell to achieve the catalytic electro-oxidation reaction of urea.

[0006] The specific steps for synthesizing MOF materials from waste PET and NCM811 are as follows: (1) Pretreatment of the octet ternary material NCM811; The NCM811 ternary material powder was washed with pure water. The powder material was originally alkaline. It was washed with pure water until the pH was about 7, and then dried at 60°C for 24 hours to obtain the treated ternary ternary material powder.

[0007] (2) The octet ternary material NCM811 is mixed with a solvent to form an ideal medium; Further, the solvent is at least one of water or a water / N,N-dimethylformamide (DMF) mixed solvent.

[0008] Preferably, the water / N,N-dimethylformamide (DMF) mixed solvent is obtained by mixing water and N,N-dimethylformamide (DMF) at a volume ratio of 1:(0.4~2.5).

[0009] (3) Place PET waste plastic in an ideal medium for heating reaction; PET waste plastic depolymerizes to produce terephthalic acid and ethylene glycol, wherein terephthalic acid and Ni, the main metal source in the octetary ternary material, coordinate to form MOF material under the condition of organic solvent.

[0010] Furthermore, the PET waste plastic is either a thin film or a polyester material; Furthermore, the ratio of the PET waste plastic to the octet ternary material NCM811 is 0.1~2 mmol: 0.1~0.4 g.

[0011] Furthermore, the heating reaction temperature is 170~200℃, and the reaction time is 16~36h.

[0012] (4) After the reaction is completed, the synthesized MOF material is washed three times with ethanol and deionized water respectively, and finally dried in an oven at 60°C overnight to obtain the MOF material.

[0013] The above MOF material was applied to the urea electro-oxidation reaction, specifically including the following steps: 20 mg of MOF material, 990 μL of anhydrous ethanol, and 10 μL of Nafion (5%) were mixed in a micro centrifuge tube and sonicated for 20 min to form a catalyst solution. 80 μL of the catalyst solution was dropped onto a 1 cm × 3 cm nickel foam surface and dried to obtain an electrode. The electrode was used as the working electrode, the HgO / Hg electrode as the reference electrode, and the platinum sheet electrode as the counter electrode to form a three-electrode system. The urea electro-oxidation was carried out using a solution containing 1 M KOH and 0.5 M urea as the electrolyte.

[0014] The above-mentioned MOF material was applied to the electrocatalytic hydrogen evolution reaction, specifically including the following steps: 20 mg of MOF material, 990 μL of anhydrous ethanol and 10 μL of Nafion (5%) were mixed in a micro centrifuge tube and sonicated for 20 min to form a catalyst solution. 80 μL of the solution was dropped onto a 1 cm × 3 cm nickel foam surface and dried to obtain an electrode. The electrode was used as the working electrode, the HgO / Hg electrode as the reference electrode and the platinum sheet electrode as the counter electrode to form a three-electrode system. Electrocatalytic hydrogen evolution was performed using a 1 M KOH solution as the electrolyte.

[0015] The beneficial effects of this invention are as follows: This invention utilizes waste PET and octet ternary materials to synthesize high-value-added MOF materials, which are then applied to the electro-oxidation of urea molecules and electrocatalytic hydrogen evolution. This achieves efficient recycling and resource utilization of solid waste, reducing dependence on primary resources and environmental pollution. It also produces functional materials with excellent electrocatalytic performance, resulting in significant green environmental benefits and good economic and social benefits. This provides a new technological path for promoting circular economy and sustainable development. Attached Figure Description

[0016] Figure 1 The XRD pattern of Ni(OH)2@Ni-MOF / NF(NCM811)-4:6; Figure 2 The FT-IR spectrum of Ni(OH)2@Ni-MOF / NF(NCM811)-4:6 is shown. Figure 3 The SEM spectrum of Ni(OH)2@Ni-MOF / NF(NCM811)-4:6; Figure 4 a) is the CV activation graph of the working electrode after a period of time; b) is a comparison graph of the electrochemical LSV performance of the working electrodes made of the materials of Example 8, Comparative Example 3, and Comparative Example 4 for urea electro-oxidation; c) is the electrode made of Ni(OH)2@Ni-MOF / NF(NCM811)-4:6 in 1.0 M KOH + 0.5 M urea electrolyte at different scan rates (10, 20, 30, 40, 50 mV s). -1 Cyclic voltammetry (CV) curves under ) are shown, and d is a comparison of the overpotential of the electrode made of Ni(OH)2@Ni-MOF / NF (NCM811)-4:6 in oxygen evolution reaction (OER) 1.0 M KOH electrolyte and urea oxidation reaction (UOR) 1.0 M KOH + 0.5 M urea electrolyte. Detailed Implementation

[0017] The present invention will be described in detail below with reference to embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several adjustments and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0018] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0019] The octa-series ternary (NCM811) powder used in the following examples and comparative examples was derived from waste lithium-ion battery cathode materials; the waste PET plastic was derived from waste mineral water plastic bottles.

[0020] The octet ternary (NCM811) powder was processed. The specific steps were as follows: the octet ternary material NCM811 powder was washed with pure water. The powder material originally had alkaline properties. It was washed with pure water until the pH was about 7. Then it was dried at 60°C for 24 hours.

[0021] Example 1

[0022] Preparation of Ni(OH)2-NCM811 catalytic powder: Add 10 mL of deionized water to a 50 mL beaker, then add 1 mmol (96 mg) of NCM811 octavalent ternary cathode powder to form a solution. Transfer the solution to a 50 mL high-temperature reactor, immerse 0.2 g of waste PET plastic in the solution, seal the reactor, and react at 180 °C for 24 h in a constant temperature oven. After the reaction, wash the product three times with deionized water and ethanol, centrifuge, and then dry it at 60 °C for 24 h in a constant temperature oven. After cooling to room temperature, Ni(OH)2-NCM811 catalyst material can be obtained.

[0023] Example 2

[0024] Preparation of Ni(OH)2@Ni-MOF(NCM811)-4mLDMF: Add 10 mL of deionized water to a 50 mL beaker, then add 1 mmol (96 mg) of NCM811 ternary octyl-8 powder to form a solution. Add 4 mL of N,N-dimethylformamide (DMF) to the solution and mix thoroughly. Transfer the solution to a 50 mL high-temperature reactor, immerse 0.2 g of waste PET plastic in the solution, seal the reactor, and react at 180 °C for 24 h in a constant temperature oven. Wash the product obtained from the reaction three times with deionized water and ethanol, centrifuge, and then place it in a constant temperature oven to dry at 60 °C for 24 h. Cool to room temperature to obtain the Ni(OH)2@Ni-MOF(NCM811)-4mL DMF catalyst.

[0025] Example 3

[0026] Preparation of Ni(OH)2@Ni-MOF(NCM811)-8mLDMF: Add 10 mL of deionized water to a 50 mL beaker, then add 1 mmol (96 mg) of NCM811 ternary octyl-8 powder to form a solution. Add 8 mL of N,N-dimethylformamide (DMF) to the solution and mix thoroughly. Transfer the solution to a 50 mL high-temperature reactor, immerse 0.2 g of waste PET plastic in the solution, seal the reactor, and react at 180 °C for 24 h in a constant temperature oven. Wash the product obtained from the reaction three times with deionized water and ethanol, centrifuge, and then place it in a constant temperature oven to dry at 60 °C for 24 h. Cool to room temperature to obtain the Ni(OH)2@Ni-MOF(NCM811)-8mL DMF catalyst.

[0027] Example 4

[0028] Preparation of NiO2(NCM811)-10mLDMF: Add 10 mL of N,N-dimethylformamide (DMF) and 2 mmol (192 mg) of NCM811 octa-series ternary (NCM811) powder to a 50 mL beaker to form a solution. Transfer the solution to a 50 mL high-temperature reactor and immerse 0.2 g of waste PET plastic in the solution. Seal the reactor and react at 180 °C for 24 h in a constant temperature oven. Wash the product obtained from the reaction with deionized water and ethanol three times, centrifuge, and then place it in a constant temperature oven to dry at 60 °C for 24 h. After cooling to room temperature, NiO2(NCM811)-10 mL LDMF catalyst material is obtained. In Example 4, the reaction system did not contain water. DMF can dissolve terephthalic acid. The terephthalic acid from the depolymerization of PET dissolved in DMF, which prevented the metal from coordinating to synthesize MOF.

[0029] Example 5

[0030] Preparation of Ni(OH)2@Ni-MOF(NCM811)-4mLH2O.

[0031] Add 10 mL of N,N-dimethylformamide (DMF) to a 50 mL beaker, then add 2 mmol (192 mg) of octa-series ternary (NCM811) powder to form a solution. Add 4 mL of deionized water to the solution and mix thoroughly. Transfer the solution to a 50 mL high-temperature reactor, immerse 0.2 g of waste PET plastic in the solution, seal the reactor, and react at 180 °C for 24 h in a constant temperature oven. Wash the product obtained from the reaction three times with deionized water and ethanol, centrifuge, and then place it in a constant temperature oven to dry at 60 °C for 24 h. After cooling to room temperature, the Ni(OH)2@Ni-MOF(NCM811)-4mLH2O catalyst material is obtained.

[0032] Example 6

[0033] Preparation of Ni(OH)2@Ni-MOF(NCM811)-8mLH2O.

[0034] Add 10 mL of N,N-dimethylformamide (DMF) to a 50 mL beaker, then add 2 mmol (192 mg) of NCM811 octa-series ternary (NCM811) powder to form a solution. Add 8 mL of deionized water to the solution and mix thoroughly. Transfer the solution to a 50 mL high-temperature reactor, immerse 0.2 g of waste PET plastic in the solution, seal the reactor, and react at 180 °C for 24 h in a constant temperature oven. Wash the product obtained from the reaction three times with deionized water and ethanol, centrifuge, and then place it in a constant temperature oven to dry at 60 °C for 24 h. After cooling to room temperature, the Ni(OH)2@Ni-MOF(NCM811)-8mLH2O catalyst material is obtained.

[0035] Example 7

[0036] Preparation of Ni(OH)2@Ni-MOF(NCM811)-4:4.

[0037] Add 4 mL of N,N-dimethylformamide (DMF) to a 50 mL beaker, then add 2 mmol (192 mg) of NCM811 octavalent ternary (NCM811) powder to form a solution. Add 4 mL of deionized water to the solution and mix thoroughly. Transfer the solution to a 50 mL high-temperature reactor, immerse 0.2 g of waste PET plastic in the solution, seal the reactor, and react at 180 °C for 24 h in a constant temperature oven. Wash the product three times with deionized water and ethanol, centrifuge, and then dry it at 60 °C for 24 h in a constant temperature oven. Cool to room temperature to obtain the Ni(OH)2@Ni-MOF(NCM811)-4:4 catalyst.

[0038] Example 8

[0039] Preparation of Ni(OH)2@Ni-MOF(NCM811)-4:6.

[0040] Add 4 mL of N,N-dimethylformamide (DMF) to a 50 mL beaker, then add 2 mmol (192 mg) of NCM811 octavalent ternary (NCM811) powder to form a solution. Add 6 mL of deionized water to the solution and mix thoroughly. Transfer the solution to a 50 mL high-temperature reactor, immerse 0.2 g of waste PET plastic in the solution, seal the reactor, and react at 180 °C for 24 h in a constant temperature oven. Wash the product obtained from the reaction three times with deionized water and ethanol, centrifuge, and then dry it at 60 °C for 24 h in a constant temperature oven. After cooling to room temperature, Ni(OH)2@Ni-MOF(NCM811)-4:6 catalyst material is obtained.

[0041] Comparative Example 1

[0042] In Example 8, 0.2g PET was replaced with 166mg terephthalic acid, and the other preparation process was the same as in Example 8, to obtain Ni(OH)2@Ni-MOF(NCM811)-BDC.

[0043] Comparative Example 2

[0044] The reaction temperature in Example 8 was changed to 170℃, and the other preparation processes were the same as in Example 8, resulting in Ni(OH)2@Ni-MOF(NCM811)-170℃.

[0045] Comparative Example 3

[0046] 291 mg of nickel nitrate hexahydrate solid was added to a 50 mL beaker, followed by 3 mL of H₂O and 4 mL of DMF. The mixture was thoroughly stirred to form a solution. This solution was then transferred to a 50 mL high-temperature reactor. A 1 cm × 3 cm piece of NF and 0.2 g of waste PET plastic were immersed in the solution. The reactor was sealed and reacted at 180 °C for 24 h in a constant-temperature oven. After the reaction, the electrode was rinsed multiple times with deionized water and ethanol until no obvious impurities were observed. It was then placed in a constant-temperature oven and dried at 60 °C for 24 h. After cooling to room temperature, a Ni-MOF / NF electrode with a nanorod structure was obtained.

[0047] Comparative Example 4

[0048] 291 mg of nickel nitrate hexahydrate solid and 16.9 mg of manganese sulfate monohydrate solid were added to a 50 mL beaker, followed by 3 mL of H₂O and 4 mL of DMF. The mixture was thoroughly stirred to form a solution. This solution was transferred to a 50 mL high-temperature reactor, and 1 cm × 3 cm pieces of NF and 0.2 g of PET waste plastic were immersed in the solution. The reactor was sealed and reacted at 180 °C for 24 h in a constant-temperature oven. After the reaction, the electrodes were rinsed repeatedly with deionized water and ethanol until no obvious impurities were observed. They were then dried at 60 °C for 24 h in a constant-temperature oven and cooled to room temperature to obtain NiMn with a nanorod structure. 0.1 -MOF / NF electrode.

[0049] Using the electrodes prepared in the examples and comparative examples as working electrodes, the HgO / Hg electrode as a reference electrode, and the platinum sheet electrode as a counter electrode, a three-electrode system was formed for electrocatalytic activity testing. The specific steps are as follows: Electrochemical performance was tested using a three-electrode system. Electrodes were prepared using the materials obtained in Examples 1-8 and Comparative Examples 1-2. The specific steps were as follows: 20 mg of the material obtained in the above examples or comparative examples, 990 μL of anhydrous ethanol, and 10 μL of Nafion (5%) were mixed in a microcentrifuge tube and sonicated for 20 min to form a catalyst solution. 80 μL of this solution was drop-coated onto a 1 cm × 3 cm nickel foam surface and dried to obtain the catalytic electrode (NF). The electrode names obtained in each example are shown in Figure 1. The prepared electrode was used as the working electrode, the HgO / Hg electrode as the reference electrode, and the platinum sheet electrode as the counter electrode. The effective area of ​​the working electrode was 0.2 cm². 2 The electrolyte consisted of 1M KOH solution and 0.5M urea solution. The scan rate for the CV test was 5 mV / s. -1 The voltage range is 0.8~2V, and the experimental test temperature is room temperature.

[0050] Table 1 lists the overpotential data of the catalytic materials prepared by the examples, comparative examples, two typical layered double hydroxides, and blank nickel foam at different current densities in the urea oxidation reaction (UOR), for systematic comparison of the differences in electrochemical performance of each catalyst.

[0051] Figure 1 The image shows the XRD pattern of Ni(OH)2@Ni-MOF(NCM811)-4:6. As can be seen from the image, Ni(OH)2@Ni-MOF(NCM811)-4:6 material was successfully prepared using octa-series ternary waste and waste PET plastic bottle flakes. The XRD diffraction peaks correspond to the diffraction peaks of Ni-MOF and Ni(OH)2.

[0052] Figure 2 The FT-IR spectrum of Ni(OH)2@Ni-MOF(NCM811)-4:6 is shown, and the functional groups of the prepared material are characterized and analyzed. The stretching vibration absorption peak of the carboxyl group and the stretching vibration absorption peak of the metal-oxygen group can be observed from the figure.

[0053] Figure 3 SEM images of the prepared Ni(OH)2@Ni-MOF(NCM811)-4:6 are shown, and the material exhibits a composite morphology of nanorods and nanosheets.

[0054] Figure 4 As shown in Figure a, the test results indicate that after a certain period of electrochemical CV activation, the electrochemical activity of the material continues to increase, and its catalytic performance gradually improves and tends to stabilize. Figure 4 b shows that, at the same current density, Ni(OH) @Ni-MOF(NCM811)-4:6 electrode material compared to pure Ni-MOF / NF and bimetallic NiMn 0.1 -MOF / NF exhibits superior catalytic activity for urea electro-oxidation (UOR) with a significantly reduced operating potential. Figure 4 c presents the cyclic voltammetry curves of this material in 1.0 M KOH + 0.5 M Urea electrolyte, with scan rates ranging from 10 to 50 mV / s. -1 .like Figure 4 As shown in Figure d, a comparative analysis of the performance of the Ni(OH)2@Ni-MOF(NCM811)-4:6 electrode in the oxygen evolution reaction (OER) 1.0 M KOH electrolyte and the urea oxidation reaction (UOR) 1.0 M KOH + 0.5 M urea electrolyte shows that, at 100 mA cm⁻¹, the electrode achieves the desired performance. -2At the current density, the overpotential required for UOR is 0.189 V lower than that for OER, indicating that the catalyst has significant electrocatalytic advantages for urea oxidation and can effectively reduce energy consumption in the water electrolysis hydrogen production process.

[0055] Table 1. Comparison of overpotentials under different current densities

[0056] References 1-3 are from the following bibliography: Gong, Y.; Zhao, H.; Ye, D.; Duan, H.; Tang, Y.; He, T.; Shah, LA; Zhang, J. High efficiency UOR electrocatalyst based on crossed nanosheet structured FeCo-LDH for hydrogen production. AppliedCatalysis A: General 2022, 643.

[0057] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for synthesizing MOF materials from waste ternary lithium batteries (NCM811) and waste PET, characterized in that, The method steps are as follows: NCM811 octet ternary material, PET waste plastic and solvent are mixed and heated to react; after the reaction is completed, the mixture is washed and dried to obtain MOF material.

2. The method for synthesizing MOF materials from waste ternary lithium battery NCM811 and waste PET as described in claim 1, characterized in that, The ratio of the eight-series ternary material NCM811 to PET waste plastic is 0.1~2 mmol: 0.1~0.4 g.

3. The method for synthesizing MOF materials from waste ternary lithium battery NCM811 and waste PET as described in claim 1, characterized in that, The solvent is one of water or a water / N,N-dimethylformamide (DMF) mixture.

4. The method for synthesizing MOF materials from waste ternary lithium battery NCM811 and waste PET as described in claim 1, characterized in that, The water / N,N-dimethylformamide (DMF) mixed solvent is obtained by mixing water and N,N-dimethylformamide (DMF) at a volume ratio of 1:(0.4~2.5).

5. The method for synthesizing MOF materials from waste ternary lithium battery NCM811 and waste PET as described in claim 1, characterized in that, The heating reaction is carried out at a temperature of 170~200℃ for a time of 16~36h.

6. A MOF material prepared by the method according to any one of claims 1-5.

7. An application of a MOF material prepared by the method according to any one of claims 1-5, characterized in that, The substance is used to catalyze the electro-oxidation of urea or the electro-catalyzed hydrogen evolution reaction.

8. The application of the MOF material as described in claim 7, characterized in that, Anhydrous ethanol and Nafion were mixed with MOF material and ultrasonically injected into a microcentrifuge tube to form a catalyst solution. The solution was then drop-coated onto the surface of nickel foam and dried to obtain an electrode. This electrode served as the working electrode, while the HgO / Hg electrode served as the reference electrode and the platinum sheet electrode served as the counter electrode, forming a three-electrode system for urea electro-oxidation or electrocatalytic hydrogen evolution.

9. The application of the MOF material as described in claim 8, characterized in that, When performing urea electro-oxidation or electrocatalytic hydrogen evolution reaction, the voltage range is 0.8~2V.

10. The application of the MOF material as described in claim 8, characterized in that, The electrolyte for urea electro-oxidation is a solution containing 1~1.5M KOH and 0.5M urea; the electrolyte for electrocatalytic hydrogen evolution reaction is a 1~1.5M KOH solution.

Images