CN115323395B - Self-supporting electrocatalytic hydrogen evolution catalyst electrode with strain lattice, and preparation method and application thereof - Google Patents
Self-supporting electrocatalytic hydrogen evolution catalyst electrode with strain lattice, and preparation method and application thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 58
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 35
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000001257 hydrogen Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011259 mixed solution Substances 0.000 claims abstract description 29
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 150000001868 cobalt Chemical class 0.000 claims abstract description 20
- 150000002815 nickel Chemical class 0.000 claims abstract description 20
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000006260 foam Substances 0.000 claims abstract description 19
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004202 carbamide Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 150000003839 salts Chemical class 0.000 claims description 17
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 27
- 230000000694 effects Effects 0.000 abstract description 12
- 239000002135 nanosheet Substances 0.000 abstract description 11
- 230000003197 catalytic effect Effects 0.000 abstract description 10
- 238000001179 sorption measurement Methods 0.000 abstract description 7
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- 238000004146 energy storage Methods 0.000 abstract description 2
- 239000011232 storage material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 32
- 239000010411 electrocatalyst Substances 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- 229910021642 ultra pure water Inorganic materials 0.000 description 12
- 239000012498 ultrapure water Substances 0.000 description 12
- 229910003266 NiCo Inorganic materials 0.000 description 10
- 238000003760 magnetic stirring Methods 0.000 description 10
- 239000002064 nanoplatelet Substances 0.000 description 10
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 8
- 238000001878 scanning electron micrograph Methods 0.000 description 8
- 238000003917 TEM image Methods 0.000 description 7
- 238000005406 washing Methods 0.000 description 5
- 229910015667 MoO4 Inorganic materials 0.000 description 4
- 229910017855 NH 4 F Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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Abstract
The invention provides a self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strain lattice, and a preparation method and application thereof, and belongs to the technical field of energy storage materials. The method comprises the following steps: mixing nickel salt, cobalt salt, molybdate, urea and water to obtain a mixed solution; and mixing the mixed solution with foam nickel, and performing hydrothermal reaction to obtain the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice. Aiming at the problem of lower HER activity of LDH materials under alkaline conditions, the invention develops a high-activity alkaline HER catalyst, LDH nanosheet materials grown in situ on foam nickel have lattice strain, the electronic structure of the materials is regulated under the action of Mo atom electron donating through Mo element doping, the splitting energy of water molecules is reduced, in addition, mo atoms and adsorption H have stronger coupling action, strong Mo-H bonds can be formed, H adsorption is enhanced, and the catalytic activity is further improved.
Description
Technical Field
The invention relates to the technical field of energy storage materials, in particular to a self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strain lattice, and a preparation method and application thereof.
Background
Electrochemical water decomposition is one of the hydrogen production technologies, provides a sustainable way for hydrogen energy conversion and storage, and is very important for increasingly scarce fossil energy sources. In the water electrolysis device, the energy efficiency is closely related to the Hydrogen Evolution Reaction (HER) on the cathode and the Oxygen Evolution (OER) reaction on the anode. The design and synthesis of the electrocatalyst with high activity plays a vital role in improving energy efficiency and driving electrolyzed water to produce hydrogen at low voltage. Precious metal catalyst materials which are practically used at present are limited in mass production and application in practice due to scarcity and high price. Therefore, the development of inexpensive, highly efficient, non-noble electrocatalysts with rapid catalytic kinetics is of great practical importance for improving electrocatalytic activity and durability.
Among the various non-noble metal catalysts, layered Double Hydroxide (LDH) catalyst materials exhibit excellent electrocatalytic properties, especially in alkaline OER catalysis, showing great potential for application. However, the weak hydrogen adsorption of LDH electrocatalyst materials in alkaline electrolytes results in their slow HER catalytic kinetics leading to reduced activity, which is detrimental to the water splitting reaction. Therefore, it is of great importance to develop inexpensive HER electrocatalysts with high catalytic activity and stability.
Disclosure of Invention
In view of the above, the present invention aims to provide a self-supporting electrocatalytic hydrogen evolution catalyst electrode with strained lattice, and a preparation method and application thereof. The self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice has high catalytic activity.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention provides a preparation method of a self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strain lattice, which comprises the following steps:
Mixing nickel salt, cobalt salt, molybdate, urea and water to obtain a mixed solution;
and mixing the mixed solution with foam nickel, and performing hydrothermal reaction to obtain the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice.
Preferably, the molar ratio of the nickel salt to the molybdate is (1-3): 1.
Preferably, the molar ratio of cobalt salt to molybdate is (1-3): 1.
Preferably, the molar ratio of metal salt to urea is (1-10): 1, the metal salt comprises nickel salt, cobalt salt and molybdate.
Preferably, the mixed solution further contains ammonium fluoride.
Preferably, the molar ratio of metal salt to ammonium fluoride is (1-10): 1, the metal salt comprises nickel salt, cobalt salt and molybdate.
Preferably, the temperature of the hydrothermal reaction is 100-200 ℃ and the time is 4-24 h.
Preferably, the dosage ratio of the foam nickel to the metal salt is 1cm 2: 0.1-10 mmol, wherein the metal salt comprises nickel salt, cobalt salt and molybdate.
The invention also provides the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice, which is prepared by the preparation method.
The invention also provides application of the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice as an electrocatalytic hydrogen evolution catalyst electrode.
The invention provides a preparation method of a self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strain lattice, which comprises the following steps: mixing nickel salt, cobalt salt, molybdate, urea and water to obtain a mixed solution; and mixing the mixed solution with foam nickel, and performing hydrothermal reaction to obtain the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice.
Aiming at the problem of lower HER activity of LDH materials under alkaline conditions, the invention develops a high-activity alkaline HER catalyst, LDH nanosheet materials (comprising F-NiCoMo LDH and NiCoMo LDH) grown in situ on foam nickel have lattice strain, the electronic structure of the materials is regulated under the action of Mo atoms electron donating, the splitting energy of water molecules is reduced, in addition, mo atoms and adsorption H have stronger coupling action, strong Mo-H bonds can be formed, H adsorption is enhanced, and the catalytic activity is further improved.
Meanwhile, the preparation process is simple, the raw material cost is low compared with that of a noble metal catalyst material, the storage is rich, the self-supporting structure avoids the adverse effect of the coating process on the catalytic activity, and the catalyst has excellent electrocatalytic activity and stability.
Furthermore, the F doping plays a role in regulating an electronic structure, and the F doping can greatly reduce a reaction energy barrier in the catalytic process, so that the catalytic reaction kinetics is accelerated.
The invention also provides the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice, which is prepared by the preparation method, wherein the doping of Mo and F optimizes the electronic structure of the surface of the material, the d-band center of the doped material is improved, the surface of the material has stronger adsorption on H, mo atoms can be combined with H by stronger Mo-H bonds, the adsorption of H is facilitated, and the doping of F can reduce the energy reaction barrier.
Drawings
Fig. 1 is an XRD pattern of the self-supporting LDH electrocatalytic HER catalyst electrode prepared in examples 1 and 2 and the catalyst electrode prepared in the comparative example;
Fig. 2 is SEM images of the self-supporting LDH electrocatalyst HER catalyst electrode prepared in examples 1 and 2 and the catalyst electrode prepared in comparative example at different magnifications, where a, b and c are SEM images of the self-supporting LDH electrocatalyst HER catalyst electrode prepared in comparative example, d, e and f are SEM images of the self-supporting LDH electrocatalyst HER catalyst electrode prepared in example 2, and g, h and i are SEM images of the catalyst electrode prepared in example 1;
FIG. 3 is a TEM image of the LDH nanoplatelets prepared in examples 1 and 2 and comparative example at different magnifications, where a, b, c are low-power TEM images of NiCo LDH, niCoMo LDH and F-NiCoMo LDH, respectively, and d, e, F are high-power TEM images of NiCo LDH, niCoMo LDH and F-NiCoMo LDH, respectively;
fig. 4 is a graph of the electrocatalytic activity test performance of the self-supporting LDH electrocatalytic HER catalyst electrodes prepared in examples 1 and 2 and the catalyst electrodes prepared in the comparative examples;
fig. 5 is a stability test curve of the self-supporting LDH electrocatalytic HER catalyst electrode prepared in example 1.
Detailed Description
The invention provides a preparation method of a self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strain lattice, which comprises the following steps:
Mixing nickel salt, cobalt salt, molybdate, urea and water to obtain a mixed solution;
and mixing the mixed solution with foam nickel, and performing hydrothermal reaction to obtain the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice.
In the present invention, all materials used are commercial products in the art unless otherwise specified.
The invention mixes nickel salt, cobalt salt, molybdate, urea and water to obtain mixed solution.
In the present invention, the molar ratio of the nickel salt to the molybdate is preferably (1 to 3): 1.
In the present invention, the molar ratio of cobalt salt to molybdate is preferably (1 to 3): 1.
In the present invention, the molar ratio of the metal salt to urea is preferably (1 to 10): 1, the metal salt preferably comprises nickel salt, cobalt salt and molybdate.
In the present invention, the mixed solution preferably further contains ammonium fluoride.
In the present invention, the molar ratio of the metal salt to ammonium fluoride is preferably (1 to 10): 1, the metal salt preferably comprises nickel salt, cobalt salt and molybdate.
The specific types of the nickel salt, cobalt salt and molybdate are not particularly limited, and those known to those skilled in the art may be used.
In the present invention, the urea serves to adjust the pH to provide an alkaline atmosphere necessary for the reaction, and the ammonium fluoride serves to provide F doping while adjusting the pH.
In the present invention, the order of mixing is preferably: mixing the nickel salt, cobalt salt, molybdate and water to obtain a first solution, mixing the urea, NH 4 F and water to obtain a second solution, and finally obtaining the mixed solution by the first solution and the second solution.
After the mixed solution is obtained, the mixed solution and foam nickel are subjected to hydrothermal reaction, and the self-supporting electrocatalytic hydrogen evolution catalyst electrode with strain crystal lattice is obtained.
In the present invention, the temperature of the hydrothermal reaction is preferably 100 to 200 ℃, more preferably 140 to 160 ℃, and the time is preferably 4 to 24 hours, more preferably 6 to 18 hours.
In the invention, during the hydrothermal reaction, metal ions react with hydroxyl groups to form hydroxide nanoplatelets (LDHs) which grow on the surface of the nickel foam.
In the invention, the dosage ratio of the foam nickel to the metal salt is preferably 1cm 2: 0.1 to 10mmol, preferably including nickel salts, cobalt salts and molybdates.
In the present invention, the hydrothermal reaction is preferably performed in a hydrothermal reaction vessel.
After the hydrothermal reaction is completed, the obtained hydrothermal product is preferably washed and dried in sequence, so that the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice is obtained.
In the present invention, the washing is preferably sequentially performed with water washing and ethanol washing.
The specific mode of the drying is not particularly limited in the present invention, and may be any mode known to those skilled in the art.
The invention also provides the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice, which is prepared by the preparation method.
In the invention, the self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strained lattice has a structure of hydroxide nano-sheets (LDH) grown in situ on foam nickel, wherein the hydroxide nano-sheets comprise NiCoMo LDH, preferably F-NiCoMo LDH nano-sheets.
The invention also provides application of the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice as an electrocatalytic hydrogen evolution catalyst electrode.
The specific mode of the application of the present invention is not particularly limited, and modes well known to those skilled in the art can be adopted.
For further explanation of the present invention, the self-supporting electrocatalytic hydrogen evolution catalyst electrode with strained lattice and its preparation method and application provided in the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
0.058G of Ni (NO 3)2·6H2O、0.058g Co(NO3)2·6H2 O and 0.048g of Na 2MoO4·2H2 O) were dissolved in 20mL of ultrapure water under magnetic stirring to prepare a mixed solution A; 0.360g of urea and 0.222g of NH 4 F were dissolved in 15mL of ultrapure water under magnetic stirring to prepare a mixed solution B. Then, the solution A and the solution B were mixed together to form a solution C. A piece of a 2.5 cm. Times.4 cm foam nickel material was immersed in the solution, and the hydrothermal reaction was carried out at 140℃for 6 hours.
Example 2
0.058G of Ni (NO 3)2·6H2O、0.058g Co(NO3)2·6H2 O and 0.048g of Na 2MoO4·2H2 O were dissolved in 20mL of ultrapure water under magnetic stirring to prepare a mixed solution A; 0.360g of urea was dissolved in 15mL of ultrapure water under magnetic stirring to prepare a mixed solution B; then, the solution A and the solution B were mixed together to form a solution C; a piece of a 2.5 cm. Times.4 cm foamed nickel material was immersed in the solution, and the reaction was hydrothermal-reacted at 140℃for 6 hours; after the end of the reaction, the sample was washed with water and ethanol several times to obtain a target electrocatalyst sample (labeled NiCoMo LDH nanosheets or NiCoMo LDH/NF).
Comparative example
0.058G of Ni (NO 3)2·6H2 O and 0.058g of Co (NO 3)2·6H2 O are dissolved in 20mL of ultrapure water to prepare a mixed solution A; 0.360g of urea is dissolved in 15mL of ultrapure water to prepare a mixed solution B under magnetic stirring), then the solution A and the solution B are mixed together to form a solution C. A piece of foam nickel material of 2.5cm multiplied by 4cm is immersed in the solution, and the mixture is subjected to hydrothermal reaction at 140 ℃ for 6 hours, and after the reaction is finished, the mixture is washed with water and ethanol for a plurality of times to obtain a target electrocatalyst sample (marked as NiCo LDH or NiCo LDH/NF).
Example 3
0.058G of Ni (NO 3)2·6H2O、0.058g Co(NO3)2·6H2 O and 0.048g of Na 2MoO4·2H2 O) are dissolved in 20mL of ultrapure water under magnetic stirring to prepare a mixed solution A, 0.360g of urea and 0.222g of NH 4 F are dissolved in 15mL of ultrapure water under magnetic stirring to prepare a mixed solution B, then the solution A and the solution B are mixed together to form a solution C, a piece of foam nickel material with the size of 2.5cm multiplied by 4cm is immersed in the solution, and hydrothermal reaction is carried out for 6 hours at the temperature of 180 ℃, and after the reaction is finished, the target electrocatalyst sample is obtained by washing with water and ethanol for a plurality of times.
Example 4
0.058G of Ni (NO 3)2·6H2O、0.058g Co(NO3)2·6H2 O and 0.024g of Na 2MoO4·2H2 O) are dissolved in 20mL of ultrapure water under magnetic stirring to prepare a mixed solution A, 0.360g of urea and 0.222g of NH 4 F are dissolved in 15mL of ultrapure water under magnetic stirring to prepare a mixed solution B, then the solution A and the solution B are mixed together to form a solution C, a piece of foam nickel material with the thickness of 2.5cm multiplied by 4cm is immersed in the solution, and hydrothermal reaction is carried out for 6 hours at the temperature of 140 ℃, and after the reaction is finished, the target electrocatalyst sample is obtained by washing with water and ethanol for a plurality of times.
Example 5
0.058G of Ni (NO 3)2·6H2 O and 0.058g of Co (NO 3)2·6H2 O are dissolved in 20mL of ultrapure water to prepare a mixed solution A; 0.360g of urea is dissolved in 15mL of ultrapure water to prepare a mixed solution B under magnetic stirring), then the solution A and the solution B are mixed together to form a solution C. A piece of foam nickel material with the thickness of 2.5cm multiplied by 4cm is immersed in the solution, and the solution is subjected to hydrothermal reaction at 160 ℃ for 6 hours, and after the reaction is finished, the solution is washed with water and ethanol for a plurality of times, so that a target electrocatalyst sample is obtained.
The self-supporting LDH electrocatalytic HER catalyst electrodes prepared in examples 1 and 2 and the catalyst electrodes prepared in the comparative examples were characterized and tested for performance as follows:
Fig. 1 is an XRD pattern of a catalyst electrode prepared in comparative examples for a self-supporting LDH electrocatalytic HER catalyst electrode prepared in examples 1 and 2. As can be seen from fig. 1, when molybdate is added, the crystallinity of the prepared nicomoldh is reduced, and the two broad (221) and (412) crystal planes move in the forward direction, indicating the presence of a compressed lattice in the material. When molybdate and ammonium fluoride are added simultaneously, crystal faces of the prepared F-NiCoMo LDH material shift to a negative direction simultaneously, which indicates that a compression lattice and a stretching lattice exist in the material simultaneously.
Fig. 2 is an SEM image of the self-supporting LDH electrocatalytic HER catalyst electrode prepared in examples 1 and 2 at different magnifications of the catalyst electrode prepared in comparative examples, wherein a, b and c are SEM images of the self-supporting LDH electrocatalytic HER catalyst electrode prepared in comparative examples, D, e and f are SEM images of the self-supporting LDH electrocatalytic HER catalyst electrode prepared in example 2, g, h and i are SEM images of the catalyst electrode prepared in example 1, and it can be seen from the figures a, b and c that the smooth-surfaced 2D ultrathin NiCo-LDH nanoplatelets are vertically grown on the surface of the nickel foam, and the uniformly distributed NiCo-LDH nanoplatelet arrays are connected to each other to form a firm honeycomb structure. From figures D, e and f, it can be seen that when molybdate is contained, the prepared nicomoldh catalyst electrode inherits a honeycomb structure composed of a 2D nano-sheet array, unlike the smooth surface of NiCo-LDH nano-sheets, which exhibit a wrinkled rough surface. As can be seen from figures g, h and i, the prepared F-NiCoMo LDH nanoplatelets exhibit a honeycomb structure consisting of 2D ultrathin nanoplatelets with simultaneous addition of molybdate and ammonium fluoride. In contrast, the surface roughness of the F-NiCoMo LDH nanoplatelets was relatively moderate.
Fig. 3 is a TEM image of LDH nanoplatelets prepared in examples 1 and 2 and comparative example at different magnifications, where a, b, c are low-power TEM images of NiCo LDH, niCoMo LDH and F-NiCoMo LDH, respectively, and d, e, F are high-power TEM images of NiCo LDH, niCoMo LDH and F-NiCoMo LDH, respectively. As can be seen from fig. 3, the NiCo LDH nanoplatelets exhibit a multi-layered 2D nanostructure with some degree of agglomeration between nanoplatelets. When molybdate is added, the agglomeration phenomenon between the flexible NiCoMo LDH nano sheets is weakened, and the thickness is reduced. When molybdate and ammonium fluoride are added simultaneously, the prepared F-NiCoMo LDH nano-sheet shows high-dispersivity ultrathin 2D nano-sheet without agglomeration. High-magnification TEM images show that the average (221) lattice spacing measurements in NiCo LDH, niCoMo LDH and F-NiCoMo LDH crystals are respectivelyAnd/>Indicating the presence of a strained lattice in the material.
The self-supported LDH electrocatalyst HER electrodes prepared in examples 1 and 2 and the catalyst electrode prepared in comparative example were tested directly as working electrode in 1M KOH solution.
Fig. 4 is a LSV performance test curve for the self-supported LDH electrocatalyst HER electrodes prepared in examples 1 and 2 and the catalyst electrode prepared in the comparative example, and compared to commercial PtC. F-NiCoMo LDH/NF showed attractive basic HER catalytic activity at a current density of 10 mA.cm -2, with overpotential of 107.5mV, 94.1mV and 54.0mV less than NiCo LDH/NF and NiCoMo LDH/NF, respectively. Even at higher current densities of 50mA cm -2、100mA·cm-2 and 200mA cm -2, the HER electrocatalytic activity of the F-nicomoldh/NF electrocatalyst material is significantly advantageous compared to NiCo LDH/NF and nicomoldh/NF electrocatalyst materials, with overpotential of 192.5mV, 214.8mV and 226.2mV, respectively. Although the HER activity of F-nicomoldh/NF at 10mA cm -2 is lower than that of PtC/NF (η=35.5 mV), the HER catalytic activity of F-nicomoldh/NF gradually approaches that of PtC/NF with increasing current density and exceeds that of PtC/NF at high current densities.
FIG. 5 is a stability test of F-NiCoMo LDH/NF prepared in example 1, showing a constant current density of 40mA cm -2 under a constant voltage i-t measurement curve test lasting 50 hours. Indicating excellent stability of the material.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (8)
1. The preparation method of the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice is characterized by comprising the following steps of:
Mixing nickel salt, cobalt salt, molybdate, urea and water to obtain a mixed solution;
mixing the mixed solution with foam nickel, and performing hydrothermal reaction to obtain the self-supporting electrocatalytic hydrogen evolution catalyst electrode with strain crystal lattice;
the molar ratio of the nickel salt to the molybdate is (1-3): 1;
the molar ratio of the cobalt salt to the molybdate is (1-3): 1.
2. The preparation method according to claim 1, wherein the molar ratio of the metal salt to urea is 1 (1-10), and the metal salt comprises nickel salt, cobalt salt and molybdate.
3. The method according to claim 1, wherein the mixed solution further contains ammonium fluoride.
4. The method of claim 3, wherein the molar ratio of metal salt to ammonium fluoride is 1 (1-10), and the metal salt comprises nickel salt, cobalt salt and molybdate.
5. The preparation method according to claim 1, wherein the hydrothermal reaction is carried out at a temperature of 100 to 200 ℃ for a time of 4 to 24 hours.
6. The preparation method according to claim 1, wherein the dosage ratio of the foam nickel to the metal salt is 1cm 2:0.1-10 mmol, and the metal salt comprises nickel salt, cobalt salt and molybdate.
7. A self-supporting electrocatalytic hydrogen evolution catalyst electrode with strained lattice made by the method of any one of claims 1-6.
8. Use of the self-supporting electrocatalytic hydrogen evolution catalyst electrode with strained lattice of claim 7 as an electrocatalytic hydrogen evolution catalyst electrode.
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| CN111871421A (en) * | 2020-08-06 | 2020-11-03 | 青岛科技大学 | Nickel-iron-molybdenum hydrotalcite nanowire bifunctional electrocatalyst and preparation method thereof |
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| CN111871421A (en) * | 2020-08-06 | 2020-11-03 | 青岛科技大学 | Nickel-iron-molybdenum hydrotalcite nanowire bifunctional electrocatalyst and preparation method thereof |
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