Experimental system for improving electrochemical performance of nickel-based catalyst
By combining an experimental system using an ultrasonic cleaner, a magnetic stirrer, and a water bath, the problems of instability and inhomogeneity in the reaction environment of nickel-based catalysts were solved, significantly improving their electrochemical performance.
Patent Information
- Application Number
- CN202423201778.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The electrochemical performance of existing nickel-based catalysts is low, mainly due to the instability of the reaction environment and the inhomogeneity of the deposition solution, resulting in insufficient catalytic activity.
An experimental system consisting of an ultrasonic cleaner, an electrolytic cell, a magnetic stirrer, and a water bath was used. The nickel mesh was cleaned ultrasonically, the electrodeposition solution was stirred with a magnetic stirrer, and the solution was heated in a water bath to ensure the stability and uniformity of the reaction environment.
The catalytic activity of nickel-based catalysts was improved, manifested by an increase in double-layer capacitance and a decrease in Tafel slope, resulting in a significant improvement in electrochemical performance.
Smart Images
Figure CN223742388U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water electrolysis for hydrogen production, and in particular to an experimental system for improving the electrochemical performance of nickel-based catalysts. Background Technology
[0002] Electrolysis of water is a pollution-free and sustainable method for hydrogen production. Highly active electrocatalysts for the hydrogen evolution reaction (HER) can effectively reduce the HER overpotential and accelerate reaction kinetics. Currently, platinum (Pt) catalysts have been proven to be the most advanced and best-performing water splitting catalysts for HER, but their high cost and low reserves hinder their large-scale application. Transition metal nickel (Ni) and its derivatives are inexpensive, but compared to noble metal-based catalysts, nickel-based materials exhibit lower catalytic efficiency and activity. This is mainly due to the chemical properties of nickel itself, as well as the temperature of the deposition solution and the uniformity of the deposited metal ions. Therefore, an experimental system to improve the electrochemical performance of nickel-based catalysts is urgently needed. Summary of the Invention
[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide an experimental system for improving the electrochemical performance of nickel-based catalysts. By utilizing different experimental instruments, the stability and uniformity of the reaction environment during electrodeposition are improved, thereby enhancing the catalytic activity of the nickel-based catalysts.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an experimental system for improving the electrochemical performance of nickel-based catalysts, comprising a nickel mesh, an ultrasonic cleaner, an electrolytic cell, a magnetic stirrer, and a water bath. The ultrasonic cleaner is used to clean the nickel mesh, the electrolytic cell is used to load a solution containing an electrodeposition solution, the magnetic stirrer is used to stir the solution containing the electrodeposition solution in the electrolytic cell to obtain an electrodeposition solution, and the water bath is used to heat the electrodeposition solution in the electrolytic cell for electrodeposition.
[0005] As a preferred embodiment, the nickel mesh is cut into 1×1.2cm pieces. 2 Electrodes of that size.
[0006] As a preferred embodiment, the effective area of the nickel mesh immersed in the electrolyte is 1 cm². 2 .
[0007] As a preferred embodiment, the ultrasonic cleaner is first filled with anhydrous ethanol to clean the nickel mesh, and then filled with hydrochloric acid for pickling.
[0008] As a preferred embodiment, the electrodeposition solution is prepared in a beaker and then poured into the electrolytic cell.
[0009] As a preferred embodiment, the water in the water bath is above the height of the electrodeposition solution in the electrolytic cell.
[0010] Compared with the prior art, the beneficial effects of this utility model are: by using different experimental instruments, this utility model improves the stability and uniformity of the reaction environment during electrodeposition, thereby improving the catalytic activity of nickel-based catalysts. Attached Figure Description
[0011] Figure 1 This is a diagram of the experimental system of this utility model;
[0012] Figure 2 This is a Cdl fitting curve diagram showing whether a water bath and a magnetic stirrer are used in the electrochemical test of this utility model;
[0013] Figure 3 This is an LSV curve showing whether a water bath and a magnetic stirrer are used in the electrochemical test of this utility model.
[0014] Figure 4 This is a Tafel fitting curve diagram showing whether a water bath and a magnetic stirrer are used in the electrochemical test of this utility model;
[0015] The attached diagram is labeled as follows: 1. Nickel mesh; 2. Ultrasonic cleaner; 3. Electrolytic cell; 4. Magnetic stirrer; 5. Water bath; 6. Beaker. Detailed Implementation
[0016] The present invention will be further described below with reference to specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the protection scope of the present invention.
[0017] Example:
[0018] like Figure 1 As shown, an experimental system for improving the electrochemical performance of nickel-based catalysts includes a nickel mesh 1, an ultrasonic cleaner 2, an electrolytic cell 3, a magnetic stirrer 4, and a water bath 5. The ultrasonic cleaner 2 is used to clean the nickel mesh 1. The electrolytic cell 3 is used to load a solution containing an electrodeposition solution. The magnetic stirrer 4 is used to stir the solution containing the electrodeposition solution in the electrolytic cell 3 to obtain an electrodeposition solution. The water bath 5 is used to heat the electrodeposition solution in the electrolytic cell 3 for electrodeposition.
[0019] Preferably, the nickel mesh 1 is cut into 1×1.2cm pieces. 2 Electrodes of that size.
[0020] More preferably, the effective immersion area of the nickel mesh 1 in the electrolyte is 1 cm². 2 .
[0021] Specifically, the longer end of the nickel mesh 1 is clamped using an electrode clip with a platinum sheet.
[0022] Preferably, the ultrasonic cleaner 2 is first filled with anhydrous ethanol to clean the nickel mesh 1, and then filled with hydrochloric acid for pickling.
[0023] Specifically, the 1cm*1cm electrode is placed in an ultrasonic cleaner 2 containing anhydrous ethanol for 5 minutes, then acid-washed with 20v / v% hydrochloric acid for 20 seconds, and then dried for later use.
[0024] More specifically, drying can be done using drying equipment or by air drying.
[0025] Preferably, the electrodeposition solution is prepared in beaker 6 and then poured into electrolytic cell 3.
[0026] Specifically, prepare the electrodeposition solution: Prepare 150ml of solution by placing 24g of anhydrous copper sulfate into beaker 6, adding 0.5mol / L sulfuric acid to beaker 6 until the mark on beaker 6 reaches 150ml.
[0027] More specifically, the magnetic stirrer 4 magnetically stirs for 30 minutes to obtain a uniform CuSO4 electrodeposition solution.
[0028] Preferably, the water in the water bath 5 is above the height of the electrodeposition solution in the electrolytic cell 3.
[0029] Specifically, the electrodeposition solution stirred by the magnetic stirrer 4 is placed in a water bath 5, and the water in the water bath 5 is submerged above the height of the electrodeposition solution in the electrolytic cell 3, and then heated to 40°C.
[0030] More specifically, a sample was obtained by electrodeposition using a nickel electrode as the working electrode and a platinum electrode as the counter electrode and reference electrode. The deposition current was 0.015 A and the deposition time was 300 s.
[0031] In practice, the deposited sample was subjected to electrochemical tests. Nickel electrode, graphite sheet and Ag / AgCl electrode were used as working electrode, counter electrode and reference electrode respectively. All electrochemical experiments were carried out in 1 mol / L potassium hydroxide solution.
[0032] 1. Cyclic voltammetry (CV curve) and calculation of double-layer capacitance (Cdl):
[0033] Cyclic voltammetry can be used to calculate the double-layer capacitance of a catalyst, which is proportional to the electrochemically active surface area and can be used to determine the size of the electrochemically active surface area of different catalysts. In this experiment, the scanning range of the cyclic voltammetry test was ±50mV of the open-circuit voltage, the scan rate was 30–70mV / s, and the interval between each rate was 20mV. The scan rate was used as the abscissa, and half of the difference between the two current densities corresponding to the open-circuit voltage was used as the ordinate. The slope of the straight line obtained by linear fitting after plotting is Cdl. Figure 2 .
[0034] 2. Linear sweep voltammetry (LSV curve) and Tafel slope analysis:
[0035] Linear scanning voltammetry was performed at a scan rate of 5 mV / s within the open-circuit voltage (OCP) and -1.2 V vs. silver chloride reference electrode voltage range. The polarization curves were then obtained through voltage conversion and IR compensation. Figure 3 The Tafel slope is obtained by taking the logarithm of the current density from the linear sweep volt-ampere curve and using it as the abscissa (log|j|), and the corresponding overpotential as the ordinate. The linear portion is then fitted to the graph. Figure 4 .
[0036] During the electrodeposition process, the use of the water bath 5 and the magnetic stirrer 4 reduced the double-layer capacitance (Cdl) of the nickel mesh 1 from 0.189 mF / cm. 2 Increased to 0.221 mF / cm 2 The electrochemical performance of nickel-based catalysts was improved by 16.9%; the Tafel slope decreased from 141.6 mV / dec to 116.1 mV / dec, a reduction of 18%. This demonstrates that improving the stability of the reaction environment temperature and the homogeneity of the solution can significantly enhance the electrochemical performance of nickel-based catalysts.
[0037] In summary, using a water bath 5 in the experimental system can solve the problem of uneven liquid temperature distribution that may occur during the preparation of the electrodeposition solution, ensuring a consistent temperature of the deposition solution during electrodeposition and reducing electrochemical performance errors caused by temperature differences. Furthermore, using a magnetic stirrer 4 can solve the problem of turbidity in the deposition solution during electrodeposition, ensuring the concentration of Cu in the deposition solution is maintained. 2+ They are evenly distributed.
[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. An experimental system for improving the electrochemical performance of a nickel-based catalyst, characterized by: Including nickel net, ultrasonic cleaner, electrolytic cell, magnetic stirrer, water bath, the ultrasonic cleaner is used to wash nickel net, the electrolytic cell is used to load the solution equipped with electrodeposition liquid, the magnetic stirrer is used to stir the solution equipped with electrodeposition liquid in electrolytic cell evenly, then the electrodeposition liquid is obtained, the water bath is used to heat the electrodeposition liquid in electrolytic cell, then carries out electrodeposition.
2. The experimental system for improving the electrochemical performance of a nickel-based catalyst according to claim 1, characterized in that: The nickel mesh is an electrode cut to a size of 1 x 1.2 cm 2 .
3. The experimental system for improving the electrochemical performance of a nickel-based catalyst according to claim 1, characterized in that: The effective area of the nickel mesh immersed in the electrolyte is 1 cm 2 .
4. The experimental system for improving the electrochemical performance of a nickel-based catalyst according to claim 1, characterized in that: The ultrasonic cleaner is first loaded with anhydrous ethanol to wash the nickel net, and then loaded with hydrochloric acid pickling.
5. The experimental system for improving the electrochemical performance of a nickel-based catalyst according to claim 1, characterized in that: The solution of electrodeposition liquid is configured by beaker, and the solution of electrodeposition liquid in beaker is poured into electrolytic cell.
6. The experimental system for improving the electrochemical performance of a nickel-based catalyst according to claim 1, characterized in that: The water in the water bath is higher than the height of the electrodeposition liquid in the electrolytic cell.