Foamed nickel loaded NiMn-MOF catalyst material as well as preparation method and application thereof
By preparing and applying NiMn-MOF catalyst material supported on nickel foam, the problems of low catalytic activity and poor stability in the electrocatalytic oxidation of potassium lactate to potassium acetate were solved, and a highly efficient and stable electrocatalytic oxidation reaction was achieved with a Faraday efficiency of up to 85%.
Patent Information
- Application Number
- CN202511076867.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-01
- Publication Date
- 2025-11-04
AI Technical Summary
Existing catalysts for the electrocatalytic oxidation of potassium lactate to potassium acetate suffer from problems such as low catalytic activity, poor stability, and low selectivity.
A nickel foam-supported NiMn-MOF catalyst was synthesized via a one-step hydrothermal method using Ni(CH3COO)2·4H2O, MnCl2·4H2O, and 2,6-naphthalenedicarboxylic acid as raw materials. The catalyst was then applied to the electro-oxidation reaction of potassium lactate in an electrolytic cell.
The method achieves efficient and stable electrocatalytic oxidation of potassium lactate to potassium acetate with a Faraday efficiency of up to 85%, and is simple to operate, under mild conditions, and is environmentally friendly.
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Figure CN120888958A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of electrocatalytic materials, and particularly relates to a foam nickel loaded NiMn-MOF catalyst material and a preparation method and application thereof. BACKGROUND
[0002] Potassium acetate is an important chemical raw material, which is widely used in food, medicine, dye and other industries. The traditional preparation method of potassium acetate mainly adopts chemical oxidation method, which has problems of serious environmental pollution and high energy consumption. As a kind of green and efficient synthesis method, electrocatalytic oxidation method has been widely concerned in recent years.
[0003] Potassium lactate is a renewable biomass resource, and its electrocatalytic oxidation into potassium acetate has important economic and environmental benefits. However, the catalysts currently used for the electrocatalytic oxidation of potassium lactate generally have problems of low catalytic activity, poor stability and low selectivity. Therefore, it has important practical significance and broad application prospect to develop a catalyst with simple preparation process, low cost, good selectivity, high catalytic activity and good stability for the electrocatalytic oxidation of potassium lactate to prepare potassium acetate. SUMMARY
[0004] The purpose of the embodiment of the application is to provide a preparation method of a foam nickel loaded NiMn-MOF catalyst material, which aims to solve the problems proposed in the background.
[0005] The embodiment of the application is implemented in this way. The preparation method of the foam nickel loaded NiMn-MOF catalyst material comprises the following steps:
[0006] The cut foam nickel is sequentially subjected to ultrasonic treatment with nitric acid, ethanol and deionized water;
[0007] The mixed powder of Ni(CH3COO)2·4H2O, MnCl2·4H2O and 2,6-naphthalene dicarboxylic acid is dissolved in deionized water and subjected to ultrasonic treatment, and then transferred to a polytetrafluoroethylene liner containing the treated foam nickel, so as to perform hydrothermal reaction, and then cooled to room temperature, washed and vacuum dried to obtain the foam nickel loaded NiMn-MOF catalyst material.
[0008] Preferably, the molar ratio of Ni(CH3COO)2·4H2O, MnCl2·4H2O and 2,6-naphthalene dicarboxylic acid is 0.5-3:0.5-3:1-3.
[0009] Preferably, in the step of dissolving the mixed powder of Ni(CH3COO)2·4H2O, MnCl2·4H2O and 2,6-naphthalene dicarboxylic acid in deionized water and subjecting to ultrasonic treatment, the ultrasonic treatment time is 20-30 min.
[0010] Preferably, the temperature of the hydrothermal reaction is 80-160 DEG C, and the time is 16-24 hours.
[0011] Another object of the present application is to provide a foam nickel supported NiMn-MOF catalyst material prepared by the above preparation method.
[0012] Another object of the present application is to provide an application of the foam nickel supported NiMn-MOF catalyst material in the preparation of potassium acetate by the electro-oxidation of potassium lactate.
[0013] Preferably, the method comprises the following steps:
[0014] The foam nickel supported NiMn-MOF catalyst material is used as an anode electrocatalyst, a Pt sheet is used as a cathode, a Hg / HgO electrode is used as a reference electrode, potassium hydroxide and potassium lactate are used as the anode electrolyte in the H-type cell, and potassium hydroxide is used as the cathode electrolyte.
[0015] Preferably, the potential applied during the power supply is 1.1-1.6 V (vs. SHE).
[0016] The preparation method of the foam nickel supported NiMn-MOF catalyst material provided by the present application is simple and easy to obtain, and the preparation method is simple, the required equipment and raw materials are abundant and low in price, and easy to obtain and repeat;
[0017] The foam nickel supported NiMn-MOF catalyst material prepared can be applied to the electro-catalytic oxidation of potassium lactate to prepare potassium acetate, and the electro-catalytic oxidation reaction is carried out at a constant potential of 1.1-1.6 V (vs. SHE), and the Faraday efficiency is as high as 85% or more. The process is simple in operation, mild in conditions, high in catalytic efficiency, and friendly to the environment, and has good application prospect. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 XPS full spectrum of the material prepared in Example 1 of the present application;
[0019] Figure 2 Ni 2p fine spectrum of the material prepared in Example 1 of the present application;
[0020] Figure 3 Mn 2p fine spectrum of the material prepared in Example 1 of the present application;
[0021] Figure 4 Cyclic voltammogram of the material prepared in Example 1 of the present application in a mixed electrolyte of potassium hydroxide and potassium lactate;
[0022] Figure 5The cyclic voltammogram of the material prepared for the present application comparative example 1 in a mixed electrolyte of potassium hydroxide and potassium lactate;
[0023] Figure 6 The double-layer capacitance value comparison chart of the materials prepared for the present application example 1 and comparative example 1;
[0024] Figure 7 The linear sweep voltammogram of the materials prepared for the present application example 1 and comparative example 1 in a mixed electrolyte of potassium hydroxide and potassium lactate;
[0025] Figure 8 The Tafel slope comparison chart of the materials prepared for the present application example 1 and comparative example 1;
[0026] Figure 9 The Faraday efficiency chart of the material prepared for the present application example 1 as a working electrode in a mixed electrolyte of potassium hydroxide and potassium lactate solution, and the electrocatalytic oxidation reaction is carried out at a constant potential of 1.1-1.6V (vs. RHE). DETAILED DESCRIPTION
[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.
[0028] A foam nickel loaded nickel manganese metal organic framework (NiMn-MOF) catalyst material, the preparation method comprises the following steps:
[0029] S1, cut the foam nickel into a size of 2*3cm rectangle, and then ultrasonically treat the cut foam nickel in 1mol / L nitric acid solution, ethanol and deionized water for 10 minutes each;
[0030] S2, dissolve 0.5-3mM Ni(CH3COO)2·4H2O, 0.5-3mM MnCl2·4H2O and 1-3mM 2,6-naphthalene dicarboxylic acid mixed powder in 30ml deionized water, and then ultrasonically stir for 30 minutes, and then transfer to a polytetrafluoroethylene liner containing the treated foam nickel, and then perform hydrothermal reaction, and then cool to room temperature, and then wash with deionized water for multiple times, and then vacuum dry at 60℃ for 12 hours to obtain the foam nickel loaded NiMn-MOF catalyst material.
[0031] The prepared foam nickel loaded NiMn-MOF catalyst material is applied in the electrocatalytic oxidation of potassium lactate to prepare potassium acetate, and specifically comprises the following steps:
[0032] The H-shaped electrolytic cell is set as an electrochemical reaction cell, a three-electrode system is adopted, the foam nickel loaded NiMn-MOF electrocatalyst is used as an anode electrocatalyst, a Pt sheet is used as a counter electrode, a Hg / HgO electrode is used as a reference electrode, a mixed solution of 1 mol / L potassium hydroxide and 0.4 mol / L potassium lactate is used as an anode electrolyte in the H-shaped cell, a 1 mol / L potassium hydroxide solution is used as a cathode electrolyte, and a potential of 1.1-1.6 V is applied to the RHE electrode during power-on.
[0033] The specific implementation of the present application is described in detail below in combination with specific examples.
[0034] Example 1, a foam nickel loaded nickel manganese metal organic framework (NiMn-MOF-120℃) catalyst material, the preparation method is as follows:
[0035] The cut foam nickel is sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each time, then 2mM Ni(CH3COO)2·4H2O, 1mM MnCl2·4H2O and 1mM 2,6-naphthalene dicarboxylic acid mixed powder are dissolved in 30ml deionized water, ultrasonic stirring is performed for 30 minutes, then the mixture is transferred into a polytetrafluoroethylene liner containing the treated foam nickel, a hydrothermal reaction is performed, the reaction is performed at 120℃ for 20h, then the mixture is cooled to room temperature, washed and vacuum dried for 12h to obtain the foam nickel loaded NiMn-MOF catalyst material.
[0036] Example 2, a foam nickel loaded nickel manganese metal organic framework (NiMn-MOF-80℃) catalyst material, the preparation method is as follows:
[0037] The cut foam nickel is sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each time, then 2mM Ni(CH3COO)2·4H2O, 1mM MnCl2·4H2O and 1mM 2,6-naphthalene dicarboxylic acid mixed powder are dissolved in 30ml deionized water, ultrasonic stirring is performed for 30 minutes, then the mixture is transferred into a polytetrafluoroethylene liner containing the treated foam nickel, a hydrothermal reaction is performed, the reaction is performed at 80℃ for 20h, then the mixture is cooled to room temperature, washed and vacuum dried for 12h to obtain the foam nickel loaded NiMn-MOF catalyst material.
[0038] Example 3, a foam nickel loaded nickel manganese metal organic framework (NiMn-MOF-160℃) catalyst material, the preparation method is as follows:
[0039] The cut foam nickel was sequentially ultrasonicated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then 2 mM Ni(CH3COO)2·4H2O, 1 mM MnCl2·4H2O, 1 mM 2,6-naphthalene dicarboxylic acid mixed powder was dissolved in 30 ml deionized water, ultrasonic stirring for 30 minutes, then transferred to a polytetrafluoroethylene liner containing the treated foam nickel, and hydrothermal reaction was carried out at 160°C for 20 h, then cooled to room temperature, washed, and vacuum dried for 12 h to obtain the foam nickel loaded NiMn-MOF catalyst material.
[0040] Example 4, a foam nickel loaded nickel manganese metal organic framework (NiMn-MOF-16h) electrocatalyst material, the preparation method is specifically as follows:
[0041] The cut foam nickel was sequentially ultrasonicated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then 2 mM Ni(CH3COO)2·4H2O, 1 mM MnCl2·4H2O, 1 mM 2,6-naphthalene dicarboxylic acid mixed powder was dissolved in 30 ml deionized water, ultrasonic stirring for 30 minutes, then transferred to a polytetrafluoroethylene liner containing the treated foam nickel, and hydrothermal reaction was carried out at 160°C for 20 h, then cooled to room temperature, washed, and vacuum dried for 12 h to obtain the foam nickel loaded NiMn-MOF catalyst material.
[0042] Example 5, a foam nickel loaded nickel manganese metal organic framework (NiMn-MOF-24h) catalyst material, the preparation method is specifically as follows:
[0043] The cut foam nickel was sequentially ultrasonicated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then 2 mM Ni(CH3COO)2·4H2O, 1 mM MnCl2·4H2O, 1 mM 2,6-naphthalene dicarboxylic acid mixed powder was dissolved in 30 ml deionized water, ultrasonic stirring for 30 minutes, then transferred to a polytetrafluoroethylene liner containing the treated foam nickel, and hydrothermal reaction was carried out at 160°C for 20 h, then cooled to room temperature, washed, and vacuum dried for 12 h to obtain the foam nickel loaded NiMn-MOF catalyst material.
[0044] Example 6, a foam nickel loaded nickel manganese metal organic framework (NiMn-MOF-2mM) catalyst material, the preparation method is specifically as follows:
[0045] The cut foam nickel is sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then, 2 mM Ni(CH3COO)2·4H2O, 1 mM MnCl2·4H2O and 2 mM 2,6-naphthalene dicarboxylic acid mixed powder are dissolved in 30 ml deionized water, and ultrasonic stirring is performed for 30 minutes. Then, the mixture is transferred into a polytetrafluoroethylene liner containing the treated foam nickel, and a hydrothermal reaction is performed at 120°C for 20 hours. After cooling to room temperature, washing and vacuum drying for 12 hours, a foam nickel loaded NiMn-MOF catalyst material is obtained.
[0046] Example 7, a foam nickel loaded nickel manganese metal organic framework (NiMn-MOF-3mM) catalyst material, is prepared according to the following method:
[0047] The cut foam nickel is sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then, 2 mM Ni(CH3COO)2·4H2O, 1 mM MnCl2·4H2O and 3 mM 2,6-naphthalene dicarboxylic acid mixed powder are dissolved in 30 ml deionized water, and ultrasonic stirring is performed for 30 minutes. Then, the mixture is transferred into a polytetrafluoroethylene liner containing the treated foam nickel, and a hydrothermal reaction is performed at 120°C for 20 hours. After cooling to room temperature, washing and vacuum drying for 12 hours, a foam nickel loaded NiMn-MOF catalyst material is obtained.
[0048] Example 8, a foam nickel loaded nickel manganese metal organic framework (NiMn(5:1)-MOF) catalyst material, is prepared according to the following method:
[0049] The cut foam nickel is sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then, 2.5 mM Ni(CH3COO)2·4H2O, 0.5 mM MnCl2·4H2O and 1 mM 2,6-naphthalene dicarboxylic acid mixed powder are dissolved in 30 ml deionized water, and ultrasonic stirring is performed for 30 minutes. Then, the mixture is transferred into a polytetrafluoroethylene liner containing the treated foam nickel, and a hydrothermal reaction is performed at 120°C for 20 hours. After cooling to room temperature, washing and vacuum drying for 12 hours, a foam nickel loaded NiMn-MOF catalyst material is obtained.
[0050] Example 9, a foam nickel loaded nickel manganese metal organic framework (NiMn(3:3)-MOF) catalyst material, is prepared according to the following method:
[0051] The cut foam nickel is sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then, 1.5 mM Ni(CH3COO)2·4H2O, 1.5 mM MnCl2·4H2O and 1 mM 2,6-naphthalene dicarboxylic acid mixed powder are dissolved in 30 ml deionized water, and ultrasonic stirring is performed for 30 minutes. Then, the mixture is transferred into a polytetrafluoroethylene liner containing the treated foam nickel, and a hydrothermal reaction is performed at 120°C for 20 hours. After cooling to room temperature, the foam nickel loaded NiMn-MOF catalyst material is obtained after washing and vacuum drying for 12 hours.
[0052] Example 10, a foam nickel loaded nickel manganese metal organic framework (NiMn(2:4)-MOF) catalyst material, is prepared according to the following method:
[0053] The cut foam nickel is sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then, 1.5 mM Ni(CH3COO)2·4H2O, 1.5 mM MnCl2·4H2O and 1 mM 2,6-naphthalene dicarboxylic acid mixed powder are dissolved in 30 ml deionized water, and ultrasonic stirring is performed for 30 minutes. Then, the mixture is transferred into a polytetrafluoroethylene liner containing the treated foam nickel, and a hydrothermal reaction is performed at 120°C for 20 hours. After cooling to room temperature, the foam nickel loaded NiMn-MOF catalyst material is obtained after washing and vacuum drying for 12 hours.
[0054] Example 11, a foam nickel loaded nickel manganese metal organic framework (NiMn(1:5)-MOF) catalyst material, is prepared according to the following method:
[0055] The cut foam nickel is sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then, 1.5 mM Ni(CH3COO)2·4H2O, 1.5 mM MnCl2·4H2O and 1 mM 2,6-naphthalene dicarboxylic acid mixed powder are dissolved in 30 ml deionized water, and ultrasonic stirring is performed for 30 minutes. Then, the mixture is transferred into a polytetrafluoroethylene liner containing the treated foam nickel, and a hydrothermal reaction is performed at 120°C for 20 hours. After cooling to room temperature, the foam nickel loaded NiMn-MOF catalyst material is obtained after washing and vacuum drying for 12 hours.
[0056] Example 1, a foam nickel loaded nickel manganese metal organic framework (NiMn-MOF) catalyst material is used to electrocatalyze the preparation of potassium acetate from potassium lactate at a constant potential (1.4V), according to the following method:
[0057] A H-type electrolytic cell was set as an electrochemical reaction cell, a three-electrode system was used, the foam nickel supported nickel manganese metal organic framework (NiMn-MOF) catalyst prepared in Example 1 (cut into a square with a size of 1 cm x 1 cm) was used as an anode electrocatalyst, a Pt sheet was used as a counter electrode, and a Hg / HgO electrode was used as a reference electrode, 50 ml of a mixed solution of 1 mol / L potassium hydroxide and 0.4 mol / L potassium lactate was used as an anode electrolyte in the H-type cell, 50 ml of 1 mol / L potassium hydroxide solution was used as a cathode electrolyte, a catalytic oxidation reaction was carried out at a constant potential of 1.4 V (vs. RHE), the reaction was considered to be completed when the theoretical coulombic quantity 7720 C was reached, and the content of potassium acetate in the product was analyzed by ion chromatography.
[0058] In application example 2, the foam nickel supported nickel manganese metal organic framework (NiMn-MOF) catalyst material was used to prepare potassium acetate by electrocatalyzing potassium lactate at a constant potential (1.45 V), and the specific method was as follows:
[0059] A H-type electrolytic cell was set as an electrochemical reaction cell, a three-electrode system was used, the foam nickel supported nickel manganese metal organic framework (NiMn-MOF) catalyst prepared in Example 1 (cut into a square with a size of 1 cm x 1 cm) was used as an anode electrocatalyst, a Pt sheet was used as a counter electrode, and a Hg / HgO electrode was used as a reference electrode, 50 ml of a mixed solution of 1 mol / L potassium hydroxide and 0.4 mol / L potassium lactate was used as an anode electrolyte in the H-type cell, 50 ml of 1 mol / L potassium hydroxide solution was used as a cathode electrolyte, a catalytic oxidation reaction was carried out at a constant potential of 1.45 V (vs. RHE), the reaction was considered to be completed when the theoretical coulombic quantity 7720 C was reached, and the content of potassium acetate in the product was analyzed by ion chromatography.
[0060] In application example 3, the foam nickel supported nickel manganese metal organic framework (NiMn-MOF) catalyst material was used to prepare potassium acetate by electrocatalyzing potassium lactate at a constant potential (1.5 V), and the specific method was as follows:
[0061] A H-type electrolytic cell was set as an electrochemical reaction cell, a three-electrode system was used, the foam nickel supported nickel manganese metal organic framework (NiMn-MOF) catalyst prepared in Example 1 (cut into a square with a size of 1 cm x 1 cm) was used as an anode electrocatalyst, a Pt sheet was used as a counter electrode, and a Hg / HgO electrode was used as a reference electrode, 50 ml of a mixed solution of 1 mol / L potassium hydroxide and 0.4 mol / L potassium lactate was used as an anode electrolyte in the H-type cell, 50 ml of 1 mol / L potassium hydroxide solution was used as a cathode electrolyte, a catalytic oxidation reaction was carried out at a constant potential of 1.5 V (vs. RHE), the reaction was considered to be completed when the theoretical coulombic quantity 7720 C was reached, and the content of potassium acetate in the product was analyzed by ion chromatography.
[0062] Example 4, the nickel-manganese metal organic framework (NiMn-MOF) catalyst material was prepared by loading the nickel foam, and the potassium acetate was prepared by electrocatalyzing potassium lactate at a constant potential (1.55 V) as follows:
[0063] The H-type electrolytic cell was set as the electrochemical reaction cell, a three-electrode system was used, the nickel-manganese metal organic framework (NiMn-MOF) catalyst prepared in Example 1 was cut into a square with a size of 1 cm x 1 cm and used as the anode electrocatalyst, the Pt sheet was used as the cathode, and the Hg / HgO electrode was used as the reference electrode. The anode electrolyte in the H-type cell contained 50 ml of a mixed solution of 1 mol / L potassium hydroxide and 0.4 mol / L potassium lactate, and the cathode electrolyte contained 50 ml of 1 mol / L potassium hydroxide solution. The catalytic oxidation reaction was carried out at a constant potential of 1.55 V (vs. RHE), and the reaction was considered to be completed when the theoretical coulombic quantity was 7720 C. The content of potassium acetate in the product was analyzed by ion chromatography.
[0064] Comparative Example 1, a nickel metal organic framework (Ni-MOF) catalyst material was prepared by loading the nickel foam as follows:
[0065] The cut nickel foam was sequentially ultrasonically treated in 1 mol / L nitric acid solution, ethanol and deionized water for 10 minutes each. Then, 3 mM Ni(CH3COO)2·4H2O and 1 mM 2,6-naphthalene dicarboxylic acid were dissolved in 30 ml of deionized water, and the mixture was ultrasonically treated and stirred for 30 minutes. Then, the mixture was transferred into a polytetrafluoroethylene liner containing the treated nickel foam, and a hydrothermal reaction was carried out at 120° for 20 hours. After cooling to room temperature, the product was washed and vacuum dried for 12 hours to obtain the nickel foam Ni-MOF catalyst material.
[0066] Performance test:
[0067] The material prepared in Example 1 was analyzed, and the XPS full spectrum is shown in Figure 1 , which shows that Ni, Mn, O and C elements exist in the prepared material;
[0068] The Ni 2p fine spectrum is shown in Figure 2 , which contains two main peaks at Ni2p 3 / 2 (856.5 eV) and Ni2p 1 / 2 (874.4 eV), and the corresponding satellite peaks at 862.1 eV and 879.9 eV, indicating that the valence state of Ni in the prepared material is mainly +2;
[0069] The Mn 2p fine spectrum is shown in Figure 3 , which corresponds to Mn 3 / 2 at Mn2p 3+(638.3 eV) and Mn 4+ (642.1 eV);
[0070] The materials prepared in Example 1 and Comparative Example 1 were respectively subjected to cyclic voltammetry test, and the double-layer capacitance values thereof were calculated, and the results are shown in Figures 4 to 6 Figure 4 , 5 It can be seen that the electrochemical active area gradually increases with the increasing of the scan rate, and the double-layer capacitance values of the materials prepared in Example 1 and Comparative Example 1 are respectively obtained through data processing, and the results are shown in Figure 6 The double-layer capacitance values of the materials prepared in Example 1 and Comparative Example 1 are respectively 4.5 mF / cm 2 and 3.27 mF / cm 2 , which indicates that Example 1 has higher catalytic active area and better electrochemical catalytic performance;
[0071] The performance of the materials prepared in Example 1 and Comparative Example 1 in the electrochemical oxidation of potassium lactate to prepare potassium acetate was tested, and the two materials were respectively used as working electrodes, a platinum plate was used as a counter electrode, and a mercury / mercury oxide electrode was used as a reference electrode. Through the test of an electrochemical workstation, the potential applied during power supply was 1.1-1.6 V compared with the RHE electrode, and the LSV curve diagram is shown in Figure 7 The Tafel slope diagram shown in Figure 8 was obtained by fitting the obtained LSV curve diagram, and according to Figure 7 It can be seen that the starting potential of the nickel-manganese metal organic framework (NiMn-MOF) catalyst supported by the foamed nickel is only 1.30 V (vs RHE), and only 1.32 V (vs RHE) is required to reach a current density of 50 mA cm -2 .
[0072] The Faraday efficiency curve of the electrocatalytic oxidation reaction of the catalyst material prepared in Example 1 as a working electrode in a mixed electrolyte of 1 mol / L potassium hydroxide and 0.4 mol / L potassium lactate at a constant potential of 1.1-1.6 V (vs RHE) is shown in Figure 9 It can be seen that the Faraday efficiency is as high as 85% or more.
[0073] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A method for preparing nickel foam-supported NiMn-MOF catalyst material, characterized in that, Includes the following steps: The cut nickel foam was ultrasonically treated sequentially with nitric acid, ethanol and deionized water. A mixed powder of Ni(CH3COO)2·4H2O, MnCl2·4H2O, and 2,6-naphthalenedicarboxylic acid was dissolved in deionized water and ultrasonically treated. The solution was then transferred to a polytetrafluoroethylene bushing containing treated nickel foam for hydrothermal reaction. After cooling to room temperature, washing, and vacuum drying, the nickel foam-supported NiMn-MOF catalyst material was obtained.
2. The method for preparing the nickel foam-supported NiMn-MOF catalyst material according to claim 1, characterized in that, The molar ratio of Ni(CH3COO)2·4H2O, MnCl2·4H2O, and 2,6-naphthalenedicarboxylic acid is 0.5~3:0.5~3:1~3.
3. The method for preparing the nickel foam-supported NiMn-MOF catalyst material according to claim 1, characterized in that, In the step of dissolving the mixed powder of Ni(CH3COO)2·4H2O, MnCl2·4H2O, and 2,6-naphthalenedicarboxylic acid in deionized water and then ultrasonically treating it, the ultrasonic treatment time is 20-30 minutes.
4. The method for preparing the nickel foam-supported NiMn-MOF catalyst material according to claim 1, characterized in that, The hydrothermal reaction is carried out at a temperature of 80~160℃ for a duration of 16~24h.
5. A nickel foam-supported NiMn-MOF catalyst material, characterized in that, It is prepared using the preparation method described in any one of claims 1-4.
6. The application of the nickel foam-supported NiMn-MOF catalyst material as described in claim 5 in the electro-oxidation of potassium lactate to prepare potassium acetate.
7. The application according to claim 6, characterized in that, Includes the following steps: The nickel foam-supported NiMn-MOF catalyst material is used as the anode electrocatalyst, Pt sheet is used as the cathode, Hg / HgO electrode is selected as the reference electrode, potassium hydroxide and potassium lactate are used as the anode electrolyte in the H-type cell, and potassium hydroxide is used as the cathode electrolyte. Potassium lactate is driven to carry out electro-oxidation reaction under the condition of energization.
8. The application according to claim 7, characterized in that, The potential applied during energization is 1.1-1.6 V compared to the standard hydrogen electrode.