A bifunctional electrocatalytic self-supporting electrode with filter paper as substrate and a preparation method thereof

Abstract

This invention relates to a bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method, belonging to the field of electrocatalysis technology. The preparation method consists of the following steps: (1) weighing nickel sulfate and cobalt sulfate and dissolving them in deionized water; (2) dissolving sodium citrate and sodium hypophosphite in deionized water respectively, and then adding them sequentially to the solution obtained in step (1); (3) adjusting the pH of the solution obtained in step (2); (4) cutting the filter paper; (5) preparing a sodium hydroxide solution; (6) placing the cut filter paper in a water bath in the solution prepared in step (5); (7) weighing palladium chloride and sodium borohydride and dissolving them in deionized water at room temperature; (8) activating and then reducing the filter paper in step (6); (9) placing the filter paper obtained in step (8) in a water bath in the solution obtained in step (3) and drying it. This invention reduces overpotential, decreases relative energy consumption, increases catalytic activity, and improves catalyst stability.

Description

Technical Field

[0001] This invention relates to a bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method, belonging to the field of electrocatalysis technology. Background Technology

[0002] Hydrogen is a promising clean, sustainable, and renewable energy source that can replace fossil fuels. Therefore, the economical and efficient production of hydrogen is crucial for its widespread application. Utilizing effective catalysts can significantly reduce the energy consumption of hydrogen production through water electrolysis. The water splitting reaction consists of two electrochemical reactions: the cathode hydrogen evolution reaction and the anodic oxygen evolution reaction. Commercially available platinum-carbon catalysts perform well, but their widespread application is limited by the high cost of precious metals. Therefore, the development of economical and efficient catalysts has become crucial in recent years.

[0003] Amorphous alloys typically exhibit excellent properties in terms of corrosion resistance, wear resistance, mechanical strength, toughness, and electrical conductivity, making them superior structural materials. Furthermore, the isotropic, flexible composition, and unsaturated surface characteristics of amorphous alloys enable them to drive electrochemical reactions.

[0004] Powdered catalyst materials cannot be self-supported. Electrocatalytic systems for the hydrogen evolution reaction (HER) require binders to transfer the powdered material onto a support. The use of binders reduces conductivity and electrocatalytic activity, thus limiting the large-scale application of the catalyst. Therefore, self-supported electrodes, where the active part is directly grown on a self-supporting porous substrate, avoid the use of binders and improve electrocatalytic performance. Zhang et al. synthesized a self-supported Ni-Mo-Fe phosphide catalyst on nickel foam for HER, achieving good results at a current density of 10 mA cm⁻¹. -2 At this point, the overpotential reaches 75 mV. A lower overpotential means a lower actual voltage is required to achieve a certain current density, resulting in less energy consumption and higher catalytic activity. Currently, commonly used catalyst substrates include nickel, copper foam, and carbon cloth. However, these substrates not only require artificial synthesis but are also non-renewable, leading to high costs. Regarding carbon cloth, there is a 30% to 50% waste during synthesis, and recycling costs are high; currently, there is no mature method for recycling and reuse. Filter paper is made from plant tissues with various porous channels. It is porous, recyclable, renewable, and inexpensive. Therefore, utilizing the porous structure of filter paper as a substrate for self-supporting electrodes holds promise for playing an important role in catalysis. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method. This invention utilizes the porous channels of filter paper to form a self-supporting electrode, which can then be directly used as the working electrode. This avoids the decrease in conductivity caused by the use of binders, thereby reducing overpotential, decreasing relative energy consumption, and increasing catalytic activity. Furthermore, the use of non-metallic alloys loaded on the filter paper improves the stability of the catalyst.

[0006] The technical solution of the present invention is as follows:

[0007] A bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method are disclosed, with the specific steps as follows:

[0008] (1) Weigh nickel sulfate and cobalt sulfate in a mass ratio of 1:0-3 and dissolve them in deionized water at room temperature; the preferred mass ratio of nickel sulfate to cobalt sulfate is 1:1.

[0009] (2) Sodium citrate and sodium hypophosphite are dissolved in deionized water at room temperature, and then added to the solution obtained in step (1) in sequence; preferably, the mass ratio of sodium citrate to sodium hypophosphite is 2:7; the mass concentrations of sodium citrate and sodium hypophosphite after dissolving in deionized water are 0.18 g / mL and 0.063 g / mL, respectively.

[0010] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0011] (4) Cut the filter paper; preferably, cut the filter paper to 1 cm * 1.5 cm;

[0012] (5) Prepare a sodium hydroxide solution of 80-100 g / L, preferably a sodium hydroxide solution of 90 g / L;

[0013] (6) Place the cut filter paper in the solution prepared in step (5) and heat it in a water bath at 80 ℃ for 15-25 min. Preferably, place the cut filter paper in the solution prepared in step (5) and heat it in a water bath at 80 ℃ for 20 min.

[0014] (7) Weigh palladium chloride and sodium borohydride, and dissolve them in deionized water at room temperature; preferably, the mass ratio of palladium chloride to sodium borohydride is 1:25; the mass-volume ratio of palladium chloride to sodium borohydride is 1:5 and 5:1, respectively, g / L;

[0015] (8) Rinse the filter paper from step (6) clean, first place it in the PdCl2 solution prepared in step (7) for activation, and then place it in the NaBH4 solution prepared in step (7) for reduction;

[0016] (9) Place the filter paper obtained in step (8) into the solution obtained in step (3), place it in a water bath at 80-90 ℃, and keep it warm for 0.5-2 h to obtain a sample; preferably, place the filter paper obtained in step (8) into the solution obtained in step (3), place it in a water bath at 90 ℃, and keep it warm for 1 h to obtain a sample;

[0017] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 h to obtain a bifunctional electrocatalytic self-supporting electrode.

[0018] The present invention also includes a bifunctional electrocatalytic self-supporting electrode based on filter paper obtained by the above method.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This invention provides a renewable and inexpensive filter paper as a substrate for preparing self-supporting electrodes, which saves resources and protects the environment.

[0021] 2. Compared with powdered electrocatalysts, this invention avoids the use of binders, has a lower overpotential, resulting in a lower actual voltage required to reach a certain current density, less energy consumption, and higher catalytic activity.

[0022] 3. Compared with self-supporting electrodes based on nickel foam and carbon cloth, this invention uses inexpensive and environmentally friendly filter paper as a substrate, which helps to reduce consumption and conforms to the concept of green environmental protection.

[0023] 2. This invention improves the specific surface area of ​​the material by loading a nickel-cobalt-phosphorus amorphous alloy onto filter paper, increases the number of active sites, reduces resistance, promotes electron transport, reduces the overpotential of HER and OER, and improves electrocatalytic activity. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 The XRD pattern of the bifunctional electrocatalytic self-supporting electrode prepared in Example 1;

[0026] Figure 2 A scanning electron microscope image of the bifunctional electrocatalytic self-supporting electrode prepared in Example 1;

[0027] Figure 3 The polarization curves of HER for the bifunctional electrocatalytic self-supporting electrodes prepared in Examples 1-7 are shown.

[0028] Figure 4The polarization curves of HER for bifunctional electrocatalytic self-supporting electrodes in Comparative Example 1 and Comparative Example 2 are shown.

[0029] Figure 5 The polarization curves of the OER of the bifunctional electrocatalytic self-supporting electrodes prepared in Examples 1-7 are shown.

[0030] Figure 6 The polarization curves of the OER of the bifunctional electrocatalytic self-supporting electrode in Comparative Example 1 and Comparative Example 2 are shown. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer with the description. However, the embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solutions of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0032] All reagents used in this invention are commercially available.

[0033] Example 1: A bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method

[0034] The specific steps of the preparation method are as follows:

[0035] (1) Weigh 0.42 g of nickel sulfate and 0.42 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature;

[0036] 2) Weigh 1.8 g of sodium citrate and 0.63 g of sodium hypophosphite and dissolve them in beakers containing 10 ml of deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0037] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0038] (4) Cut the filter paper to 1 cm * 1.5 cm;

[0039] (5) Weigh 0.9 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0040] (6) Place the cut filter paper in the NaOH solution prepared in step (5) and heat it in a water bath at 80 °C for 20 min;

[0041] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0042] (8) Rinse the filter paper obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min.

[0043] (9) Rinse the filter paper obtained in step (8) clean, place it in the solution obtained in step (3), place it in a 90 ℃ water bath, and keep it warm for 1 h to obtain the sample;

[0044] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 h to obtain a bifunctional electrocatalytic self-supporting electrode.

[0045] Example 2: A bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method

[0046] The specific steps of the preparation method are as follows:

[0047] (1) Weigh 0.42 g of nickel sulfate and 0.42 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature;

[0048] (2) Weigh 1.8g sodium citrate and 0.63g sodium hypophosphite and dissolve them in beakers containing 10ml deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0049] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0050] (4) Cut the filter paper to 1 cm * 1.5 cm;

[0051] (5) Weigh 0.8 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0052] (6) Place the cut filter paper in the solution prepared in step (5) and incubate in a water bath at 80 °C for 25 min;

[0053] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0054] (8) Rinse the filter paper obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min.

[0055] (9) Rinse the filter paper obtained in step (8) clean, place it in the solution obtained in step (3), place it in an 85 ℃ water bath, and keep it warm for 0.5 h to obtain the sample;

[0056] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 h to obtain a bifunctional electrocatalytic self-supporting electrode.

[0057] Example 3: A bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method

[0058] The specific steps of the preparation method are as follows:

[0059] (1) Weigh 0.42 g of nickel sulfate and 0.42 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature;

[0060] (2) Weigh 1.8 g sodium citrate and 0.63 g sodium hypophosphite and dissolve them in beakers containing 10 ml of deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0061] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0062] (4) Cut the filter paper to 1 cm * 1.5 cm;

[0063] (5) Weigh 1 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0064] (6) Place the cut filter paper in the solution prepared in step (5) and incubate in a water bath at 80 °C for 15 min;

[0065] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0066] (8) Rinse the filter paper obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min.

[0067] (9) Rinse the filter paper obtained in step (8) clean, place it in the solution obtained in step (3), place it in an 80 ℃ water bath, and keep it warm for 2 h to obtain the sample;

[0068] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 hours to obtain a self-supporting electrode.

[0069] Example 4: A bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method

[0070] The specific steps of the preparation method are as follows:

[0071] (1) Weigh 0.42 g of nickel sulfate and 0.84 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature;

[0072] (2) Weigh 1.8 g sodium citrate and 0.63 g sodium hypophosphite and dissolve them in beakers containing 10 ml of deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0073] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0074] (4) Cut the filter paper to 1 cm * 1 cm;

[0075] (5) Weigh 0.9 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0076] (6) Place the cut filter paper in the solution prepared in step (5) and incubate in a water bath at 80 °C for 15 min;

[0077] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0078] (8) Rinse the filter paper obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min.

[0079] (9) Rinse the filter paper obtained in step (8) clean, place it in the solution obtained in step (3), place it in a 90 ℃ water bath, and keep it warm for 1 h to obtain the sample;

[0080] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 hours to obtain a self-supporting electrode.

[0081] Example 5: A bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method

[0082] The specific steps of the preparation method are as follows:

[0083] (1) Weigh 0.42 g of nickel sulfate and 1.26 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature;

[0084] (2) Weigh 1.8 g sodium citrate and 0.63 g sodium hypophosphite and dissolve them in beakers containing 10 ml of deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0085] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0086] (4) Cut the filter paper to 1 cm * 1 cm;

[0087] (5) Weigh 0.9 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0088] (6) Place the cut filter paper in the solution prepared in step (5) and incubate in a water bath at 80 °C for 20 min;

[0089] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0090] (8) Rinse the filter paper obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min.

[0091] (9) Rinse the filter paper obtained in step (8) clean, place it in the solution obtained in step (3), place it in a 90 ℃ water bath, and keep it warm for 1 h to obtain the sample;

[0092] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 hours to obtain a self-supporting electrode.

[0093] Example 6: A bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method

[0094] The specific steps of the preparation method are as follows:

[0095] (1) Weigh 0.42 g of nickel sulfate and 0.21 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature;

[0096] (2) Weigh 1.8g sodium citrate and 0.63g sodium hypophosphite and dissolve them in beakers containing 10ml deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0097] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0098] (4) Cut the filter paper to 1 cm * 1.5 cm;

[0099] (5) Weigh 0.9 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0100] (6) Place the cut filter paper in the solution prepared in step (5) and incubate in a water bath at 80 °C for 20 min;

[0101] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0102] (8) Rinse the filter paper obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min.

[0103] (9) Rinse the filter paper obtained in step (8) clean, place it in the solution obtained in step (3), place it in a 90 ℃ water bath, and keep it warm for 1 h to obtain the sample;

[0104] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 hours to obtain a self-supporting electrode.

[0105] Example 7: A bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method

[0106] The specific steps of the preparation method are as follows:

[0107] (1) Weigh 0.42 g of nickel sulfate and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0108] (2) Weigh 1.8 g sodium citrate and 0.63 g sodium hypophosphite and dissolve them in beakers containing 10 ml of deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0109] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0110] (4) Cut the filter paper to 1 cm * 1.5 cm;

[0111] (5) Weigh 0.9 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0112] (6) Place the cut filter paper in the solution prepared in step (5) and incubate in a water bath at 80°C for 20 min;

[0113] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0114] (8) Rinse the filter paper obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min.

[0115] (9) Rinse the filter paper obtained in step (8) clean, place it in the solution obtained in step (3), place it in a 90 ℃ water bath, and keep it warm for 1 h to obtain the sample;

[0116] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 hours to obtain a self-supporting electrode.

[0117] Comparative Example 1: A bifunctional electrocatalytic self-supporting electrode based on nickel foam and its preparation method

[0118] The specific steps of the preparation method are as follows:

[0119] (1) Weigh 0.42 g of nickel sulfate and 0.42 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature;

[0120] (2) Weigh 1.8 g sodium citrate and 0.63 g sodium hypophosphite and dissolve them in beakers containing 10 ml of deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0121] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0122] (4) Cut the nickel foam to 1 cm * 1.5 cm;

[0123] (5) Weigh 0.9 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0124] (6) Place the cut nickel foam in the solution prepared in step (5) and incubate in a water bath at 80 °C for 20 min;

[0125] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0126] (8) Rinse the nickel foam obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) for activation for 5 min, and then place it in the NaBH4 solution prepared in step (7) for reduction for 5 min.

[0127] (9) Rinse the nickel foam obtained in step (8) clean, place it in the solution obtained in step (3), place it in a 90°C water bath, and keep it warm for 1 h to obtain the sample;

[0128] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 hours to obtain a self-supporting electrode.

[0129] Comparative Example 2: A bifunctional electrocatalytic self-supporting electrode based on carbon cloth and its preparation method

[0130] The specific steps of the preparation method are as follows:

[0131] (1) Weigh 0.42 g of nickel sulfate and 0.42 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature;

[0132] (2) Weigh 1.8 g sodium citrate and 0.63 g sodium hypophosphite and dissolve them in beakers containing 10 ml of deionized water at room temperature, and add them to the solution obtained in step (1) in sequence;

[0133] (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia;

[0134] (4) Cut the carbon cloth to 1 cm * 1.5 cm;

[0135] (5) Weigh 0.9 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature;

[0136] (6) Arrange the cut carbon in the solution prepared in step (5) and incubate in a water bath at 80 °C for 20 min;

[0137] (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature;

[0138] (8) Rinse the carbon cloth obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min.

[0139] (9) Rinse the carbon cloth obtained in step (8) clean, place it in the solution obtained in step (3), place it in a 90 ℃ water bath, and keep it warm for 1 h to obtain the sample;

[0140] (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 hours to obtain a self-supporting electrode.

[0141] Experimental Example 1

[0142] The bifunctional electrocatalytic self-supporting electrode prepared in Example 1 was sampled and tested. The XRD pattern is shown below. Figure 1 As shown, the prepared sample is an amorphous material with only one broad diffraction peak, indicating that a self-supporting electrode with amorphous material loaded on its surface has been obtained; the scanning electron microscope image is shown below. Figure 2 As shown, a and b represent self-supporting electrodes obtained at different magnifications. The HER electrochemical properties of the bifunctional electrocatalytic self-supporting electrodes obtained in Examples 1-7 are shown in the following figures. Figure 3 , Figure 3 The LSV curve of the self-supporting electrode prepared in this invention for HER in 1 M KOH solution is shown. The HER electrochemical properties of the bifunctional electrocatalytic self-supporting electrode obtained from Comparative Examples 1 and 2 are shown in the figure. Figure 4 As shown, Figure 4 The LSV curves of the HER of the self-supported electrode prepared in comparison examples in 1 MKOH solution are shown below. The OER electrochemical property test graphs of the self-supported electrodes obtained in Examples 1-7 are also shown. Figure 5 As shown, Figure 5 The LSV curve of the OER of the self-supporting electrode prepared in this invention in 1 M KOH solution. Figure 6 LSV curves of the HER of the self-supported electrodes prepared for Comparative Examples 1 and 2 in 1 M KOH solution.

Claims

1. A method for preparing a bifunctional electrocatalytic self-supporting electrode based on filter paper, the specific steps of which are as follows: (1) Weigh 0.42 g of nickel sulfate and 0.42 g of cobalt sulfate and dissolve them in a beaker containing 10 ml of deionized water at room temperature; (2) Weigh 1.8 g sodium citrate and 0.63 g sodium hypophosphite and dissolve them in beakers containing 10 ml of deionized water at room temperature, and add them to the solution obtained in step (1) in sequence; (3) Adjust the pH of the solution obtained in step (2) to 10 using ammonia; (4) Cut the filter paper to 1 cm. 1.5 cm; (5) Weigh 0.9 g of sodium hydroxide and dissolve it in a beaker containing 10 ml of deionized water at room temperature; (6) Place the cut filter paper in the NaOH solution prepared in step (5) and heat it in a water bath at 80 °C for 20 min; (7) Weigh 0.002 g palladium chloride and 0.05 g sodium borohydride, and dissolve them in beakers containing 10 ml of deionized water at room temperature; (8) Rinse the filter paper obtained in step (6) clean, first place it in the PdCl2 solution prepared in step (7) to activate it for 5 min, and then place it in the NaBH4 solution prepared in step (7) to reduce it for 5 min. (9) Rinse the filter paper obtained in step (8) clean, place it in the solution obtained in step (3), place it in a 90 ℃ water bath, and keep it warm for 1 h to obtain the sample; (10) Rinse the sample obtained in step (9) and place it in a vacuum drying oven for 3 h to obtain a bifunctional electrocatalytic self-supporting electrode.

2. The bifunctional electrocatalytic self-supporting electrode obtained by the preparation method described in claim 1.

Images