CN115323395A - Self-supporting electro-catalytic hydrogen evolution catalyst electrode with strain lattice and preparation method and application thereof - Google Patents
Self-supporting electro-catalytic 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 57
- 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 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 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
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 19
- 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 15
- 238000000034 method Methods 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 150000003839 salts Chemical class 0.000 claims description 18
- 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
- 239000006260 foam Substances 0.000 claims description 3
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- 239000011232 storage material Substances 0.000 abstract description 2
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 13
- 229910021642 ultra pure water Inorganic materials 0.000 description 12
- 239000012498 ultrapure water Substances 0.000 description 12
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- 229910003266 NiCo Inorganic materials 0.000 description 8
- 238000003760 magnetic stirring Methods 0.000 description 8
- 238000001878 scanning electron micrograph Methods 0.000 description 8
- 239000007795 chemical reaction product Substances 0.000 description 6
- 238000003917 TEM image Methods 0.000 description 5
- 238000006555 catalytic reaction Methods 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
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Abstract
The invention provides a self-supporting electro-catalytic hydrogen evolution catalyst electrode with strain lattices and a preparation method and application thereof, belonging 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 foamed nickel, and carrying out hydrothermal reaction to obtain the self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice. Aiming at the problem of low HER activity of an LDH material under an alkaline condition, the invention develops a high-activity alkaline HER catalyst, an LDH nanosheet material grown in situ on foamed nickel has lattice strain, the electronic structure of the material is adjusted under the action of Mo atom for electron through Mo element doping, the splitting energy of water molecules is reduced, in addition, mo atom and adsorbed H have stronger coupling effect, a strong Mo-H bond 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 strain lattices and a preparation method and application thereof.
Background
Electrochemical water decomposition is one of hydrogen production technologies, provides a sustainable way for hydrogen energy conversion and storage, and is very important for fossil energy which is increasingly scarce. In an electrolytic water device, energy efficiency is closely related to Hydrogen Evolution Reaction (HER) on the negative electrode and Oxygen Evolution (OER) reaction on the positive electrode. The design and synthesis of the electrocatalyst with high activity play a vital role in improving energy efficiency and driving water electrolysis to produce hydrogen at low voltage. The current practical precious metal catalyst materials have limited their practical mass production and use due to scarcity and high price. Therefore, the development of inexpensive, efficient, non-noble electrocatalysts with rapid catalytic reaction kinetics is of great practical significance for improving electrocatalytic activity and durability.
Among various non-noble metal catalysts, the Layered Double Hydroxide (LDH) catalyst material shows excellent electrocatalytic performance, and especially shows great application potential in basic OER catalysis. However, the weak hydrogen adsorption of LDH electrocatalyst materials in alkaline electrolytes leads to 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 a cheap HER electrocatalyst with high catalytic activity and stability.
Disclosure of Invention
In view of the above, the present invention provides a self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strained lattice, and a preparation method and applications thereof. The self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal 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 strain lattices, 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 foamed nickel, and carrying out hydrothermal reaction to obtain the self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice.
Preferably, the molar ratio of the nickel salt to the molybdate is (1-3): 1.
preferably, the molar ratio of the cobalt salt to the molybdate is (1-3): 1.
preferably, the molar ratio of metal salt to urea is (1-10): the metal salt includes 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): the metal salt includes 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 nickel foam 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 a self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice, which is prepared by the preparation method in the technical scheme.
The invention also provides the application of the self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice in the technical scheme as an electro-catalytic hydrogen evolution catalyst electrode.
The invention provides a preparation method of a self-supporting electrocatalytic hydrogen evolution catalyst electrode with strain lattices, 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 foamed nickel, and carrying out hydrothermal reaction to obtain the self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice.
Aiming at the problem of low HER activity of an LDH material under an alkaline condition, the invention develops a high-activity alkaline HER catalyst, LDH nanosheet material (comprising F-NiCoMo LDH and NiCoMo LDH) growing in situ on foamed nickel has lattice strain, the electronic structure of the material is adjusted under the action of Mo atom for electron through Mo element doping, the splitting energy of water molecule is reduced, in addition, mo atom and adsorbed H have stronger coupling effect, a strong Mo-H bond can be formed, H adsorption is enhanced, and further the catalytic activity is improved.
Meanwhile, the preparation process is simple, the raw material cost has the advantages of low price and rich reserves compared with the precious metal catalyst material, the self-supporting structure avoids the adverse effect of the coating process on the catalytic activity, and the excellent electrocatalytic activity and stability are shown.
Furthermore, F doping plays a role in adjusting an electronic structure, and the F doping can greatly reduce a reaction energy barrier in a catalysis process, so that the catalytic reaction kinetics is accelerated.
The invention also provides the self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain lattice prepared by the preparation method in the technical scheme, the electronic structure of the surface of the material is optimized by doping Mo and F, the d-band center of the doped material is improved, the surface of the material has stronger adsorption to H, mo atoms can be combined with H by stronger Mo-H bonds, H adsorption is facilitated, and the energy reaction barrier can be reduced by doping F.
Drawings
Figure 1 is an XRD pattern of the self-supported LDH electrocatalytic HER catalyst electrodes prepared in examples 1 and 2 and the catalyst electrode prepared in a comparative example;
figure 2 is SEM images at different magnifications of the self-supported LDH electrocatalytic HER catalyst electrodes prepared in examples 1 and 2 and the catalyst electrode prepared in a comparative example, wherein a, b and c are SEM images of the self-supported LDH electrocatalytic HER catalyst electrode prepared in the comparative example, d, e and f are SEM images of the self-supported LDH electrocatalytic 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 TEM images at different magnifications of LDH nanosheets prepared in examples 1 and 2 and comparative examples, wherein a, b, c are low-magnification TEM images of NiCo LDH, niCoMo LDH and F-NiCoMo LDH, respectively, and d, e, F are high-magnification 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-supported LDH electrocatalytic HER catalyst electrodes prepared in examples 1 and 2 and the catalyst electrode prepared in the comparative example;
figure 5 is a stability test curve for the self-supported 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 strain lattices, 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 foamed nickel, and carrying out hydrothermal reaction to obtain the self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice.
In the present invention, unless otherwise specified, all the raw materials used are commercially available in the art.
According to the invention, nickel salt, cobalt salt, molybdate, urea and water are mixed to obtain a 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 the cobalt salt to the 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): the metal salt preferably includes 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 the ammonium fluoride is preferably (1 to 10): the metal salt preferably includes nickel salt, cobalt salt and molybdate.
The specific species of the nickel salt, cobalt salt and molybdate are not particularly limited in the present invention, and those known to those skilled in the art may be used.
In the invention, the urea is used for adjusting the pH value and providing an alkaline atmosphere necessary for reaction, and the ammonium fluoride is used for adjusting the pH value and simultaneously providing F doping.
In the present invention, the order of mixing is preferably: mixing the nickel salt, the cobalt salt, the molybdate and water to obtain a first solution, and then mixing the urea and the NH 4 And F, mixing the solution F with water to obtain a second solution, and finally mixing the first solution and the second solution to obtain the mixed solution.
After the mixed solution is obtained, the mixed solution and the foamed nickel are subjected to hydrothermal reaction to obtain the self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice.
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 nanosheets (LDH) growing on the surface of the foamed nickel.
In the present invention, the ratio of the amount of the nickel foam to the amount of the metal salt is preferably 1cm 2 :0.1 to 10mmol, and the metal salt preferably includes nickel salt, cobalt salt and molybdate.
In the present invention, the hydrothermal reaction is preferably carried out in a hydrothermal reaction vessel.
After the hydrothermal reaction is finished, the obtained hydrothermal product is preferably washed and dried in sequence to obtain the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain crystal lattice.
In the present invention, the washing is preferably performed by water washing and ethanol washing in this order.
The present invention is not particularly limited to the specific manner of drying, and may be performed in a manner known to those skilled in the art.
The invention also provides a self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice, which is prepared by the preparation method in the technical scheme.
In the present invention, the structure of the self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strained lattice is hydroxide nanosheets (LDH) grown in situ on foamed nickel, including NiCoMo LDH, preferably F-NiCoMo LDH nanosheets.
The invention also provides the application of the self-supporting electro-catalytic hydrogen evolution catalyst electrode with the strain crystal lattice in the technical scheme as an electro-catalytic hydrogen evolution catalyst electrode.
The invention is not particularly limited to the specific manner of use described, as such may be readily adapted by those skilled in the art.
In order to further illustrate the present invention, the self-supporting electrocatalytic hydrogen evolution catalyst electrode with strained lattice provided by the present invention and the preparation method and application thereof are described in detail below with reference to examples, which should not be construed as limiting the scope of the present invention.
Example 1
0.058g of Ni (NO) is added under magnetic stirring 3 ) 2 ·6H 2 O、0.058g Co(NO 3 ) 2 ·6H 2 O and 0.048g Na 2 MoO 4 ·2H 2 Dissolving O in 20mL of ultrapure water to prepare a mixed solution A; 0.360g of urea and 0.222g of NH were stirred magnetically 4 F was dissolved in 15mL of ultrapure water to prepare a mixed solution B. Solution a and solution B are then mixed together to form solution C. A2.5 cm X4 cm piece of foamed nickel material was immersed in the solution and subjected to hydrothermal reaction at 140 ℃ for 6 hours. And after the reaction is finished, washing the reaction product for multiple times by using water and ethanol to obtain a target electrocatalyst sample (marked as F-NiCoMo LDH or F-NiCoMo LDH/NF).
Example 2
0.058g of Ni (NO) is added under magnetic stirring 3 ) 2 ·6H 2 O、0.058g Co(NO 3 ) 2 ·6H 2 O and 0.048g Na 2 MoO 4 ·2H 2 Dissolving O in 20mL of ultrapure water to prepare a mixed solution A; a mixed solution B was prepared by dissolving 0.360g of urea in 15mL of ultrapure water under magnetic stirring. Solution a and solution B are then mixed together to form solution C. A piece of 2.5cm by 4cm of foamed nickel material was immersed in the solution and subjected to hydrothermal reaction at 140 ℃ for 6 hours. And after the reaction is finished, washing the reaction product for multiple times by using water and ethanol to obtain a target electrocatalyst sample (marked as NiCoMo LDH nanosheet or NiCoMo LDH/NF).
Comparative example
0.058g of Ni (NO) is added under magnetic stirring 3 ) 2 ·6H 2 O and 0.058g Co (NO) 3 ) 2 ·6H 2 Dissolving O in 20mL of ultrapure water to prepare a mixed solution A; dissolving 0.360g of urea under magnetic stirringThe mixed solution B was prepared in 15mL of ultrapure water. Solution a and solution B are then mixed together to form solution C. A2.5 cm X4 cm piece of foamed nickel material was immersed in the solution and subjected to hydrothermal reaction at 140 ℃ for 6 hours. And after the reaction is finished, washing the reaction product for multiple times by using water and ethanol to obtain a target electrocatalyst sample (marked as NiCo LDH or NiCo LDH/NF).
Example 3
0.058g of Ni (NO) is added under magnetic stirring 3 ) 2 ·6H 2 O、0.058g Co(NO 3 ) 2 ·6H 2 O and 0.048g Na 2 MoO 4 ·2H 2 Dissolving O in 20mL of ultrapure water to prepare a mixed solution A; 0.360g of urea and 0.222g of NH were stirred magnetically 4 F was dissolved in 15mL of ultrapure water to prepare a mixed solution B. Solution a and solution B are then mixed together to form solution C. A piece of 2.5 cm. Times.4 cm of foamed nickel material was immersed in the solution and subjected to hydrothermal reaction at 180 ℃ for 6 hours. And after the reaction is finished, washing the reaction product for multiple times by using water and ethanol to obtain a target electrocatalyst sample.
Example 4
0.058g of Ni (NO) is added under magnetic stirring 3 ) 2 ·6H 2 O、0.058g Co(NO 3 ) 2 ·6H 2 O and 0.024g Na 2 MoO 4 ·2H 2 Dissolving O in 20mL of ultrapure water to prepare a mixed solution A; 0.360g of urea and 0.222g of NH were stirred magnetically 4 F was dissolved in 15mL of ultrapure water to prepare a mixed solution B. Solution a and solution B are then mixed together to form solution C. A piece of 2.5cm by 4cm of foamed nickel material was immersed in the solution and subjected to hydrothermal reaction at 140 ℃ for 6 hours. And after the reaction is finished, washing the reaction product for multiple times by using water and ethanol to obtain a target electrocatalyst sample.
Example 5
0.058g of Ni (NO) is added under magnetic stirring 3 ) 2 ·6H 2 O and 0.058g Co (NO) 3 ) 2 ·6H 2 Dissolving O in 20mL of ultrapure water to prepare a mixed solution A; a mixed solution B was prepared by dissolving 0.360g of urea in 15mL of ultrapure water under magnetic stirring. Then, the solution A and the solution B are mixedThe solutions B were mixed together to form solution C. A piece of 2.5cm by 4cm of foamed nickel material was immersed in the solution and subjected to hydrothermal reaction at 160 ℃ for 6 hours. And after the reaction is finished, washing the reaction product for multiple times by using water and ethanol to obtain a target electrocatalyst sample.
Characterization and performance tests were performed on the self-supported LDH electrocatalytic HER catalyst electrodes prepared in examples 1 and 2 and the catalyst electrodes prepared in the comparative example as follows:
figure 1 is an XRD pattern of self-supported LDH electrocatalytic HER catalyst electrodes prepared in examples 1 and 2 and catalyst electrodes prepared in a comparative example. As can be seen from fig. 1, the crystallinity of the NiCoMo LDH prepared is reduced with the addition of molybdate, and the two wider (221) and (412) crystal planes are shifted in the positive direction, indicating the occurrence of a compact lattice in the material. When molybdate and ammonium fluoride are added simultaneously, the crystal face of the prepared F-NiCoMo LDH material is shifted to the negative direction simultaneously, which shows that compressed crystal lattices and stretched crystal lattices exist in the material simultaneously.
Fig. 2 is SEM images at different magnifications of self-supported LDH electrocatalytic HER catalyst electrodes prepared in examples 1 and 2 with catalyst electrodes prepared in comparative examples, wherein a, b and c are SEM images of self-supported LDH electrocatalytic HER catalyst electrodes prepared in comparative examples, D, e and f are SEM images of self-supported LDH electrocatalytic HER catalyst electrodes prepared in example 2, and g, h and i are SEM images of catalyst electrodes prepared in example 1, and it can be seen from a, b and c in the figures that 2D ultra-thin NiCo-nanosheets with smooth surfaces vertically grow on the surface of foamed nickel and the arrays of uniformly distributed NiCo-LDH nanosheets are connected to each other to form a strong cellular structure of LDH. As can be seen from D, e and f in the figures, the prepared NiCoMo LDH catalyst electrode, when containing molybdate, inherits the honeycomb structure consisting of 2D nanosheet arrays, and the NiCoMo LDH nanosheets exhibit a wrinkled, rough surface, unlike the smooth surface of NiCo-LDH nanosheets. As can be seen from g, h and i in the figure, the prepared F-NiCoMo LDH nano-sheet presents a honeycomb structure consisting of 2D ultrathin nano-sheets under the condition of simultaneously adding molybdate and ammonium fluoride. In contrast, the surface roughness of the F-NiCoMo LDH nanosheets is relatively moderate.
FIG. 3 is a schematic view of an embodimentExamples 1 and 2 and comparative example preparation of LDH nanosheets TEM images at different magnifications were taken of a, b, c for NiCo LDH, niCoMo LDH and F-NiCoMo LDH at low magnification, and d, e, F for NiCo LDH, niCoMo LDH and F-NiCoMo LDH at high magnification. As can be seen from fig. 3, niCo LDH nanosheets exhibit a multilayer 2D nanostructure, and some degree of agglomeration exists between the nanosheets. When molybdate is added, the agglomeration phenomenon among the flexible NiCoMo LDH nano sheets is weakened, and the thickness is reduced. When molybdate and ammonium fluoride are added at the same time, the prepared F-NiCoMo LDH nanosheet shows a high-dispersity ultrathin 2D nanosheet, and is free of agglomeration. High magnification TEM images show that the average (221) lattice spacing in the crystals of NiCo LDH, niCoMo LDH and F-NiCoMo LDH, respectively, is measured as
And
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 the comparative example were used directly as working electrodes for testing in 1M KOH solution.
Figure 4 is a plot of the LSV performance test of self-supported LDH electrocatalyst HER electrodes prepared in examples 1 and 2 and catalyst electrodes prepared in a comparative example, and compared to commercial PtC. At a current density of 10mA cm -2 F-NiCoMo LDH/NF exhibited attractive alkaline HER catalytic activity with an overpotential of 107.5mV, 94.1mV and 54.0mV less than NiCoMo LDH/NF and NiCoMo LDH/NF, respectively. Even at 50mA cm -2 、100mA·cm -2 And 200mA · cm -2 The HER electrocatalytic activity of the F-NiCoMo LDH/NF electrocatalyst material is also obviously superior to that of NiCo LDH/NF and NiCoMo LDH/NF electrocatalyst materials under the condition of higher current density, and the overpotentials of the F-NiCoMo LDH/NF electrocatalyst material are 192.5mV, 214.8mV and 226.2mV respectively. Although F-NiCoMo LDH/NF was at 10 mA-cm -2 The HER activity was lower than PtC/NF (eta =35.5 mV), but with increasing current density, the HER catalytic activity of F-NiCoMo LDH/NF gradually approached that of PtC/NF, and at high currentsAt densities above PtC/NF.
FIG. 5 is a stability test of F-NiCoMo LDH/NF prepared in example 1, showing 40mA cm under a constant voltage i-t measurement curve test for 50 hours -2 Constant current density of (2). Indicating excellent stability of the material.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principle of the present invention, and should be considered as within the scope of the present invention.
Claims (10)
1. A preparation method of a self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strained lattice is characterized by comprising the following steps:
mixing nickel salt, cobalt salt, molybdate, urea and water to obtain a mixed solution;
and mixing the mixed solution with foamed nickel, and carrying out hydrothermal reaction to obtain the self-supporting electrocatalytic hydrogen evolution catalyst electrode with the strain lattice.
2. The method according to claim 1, wherein the molar ratio of the nickel salt to the molybdate is (1-3): 1.
3. the method according to claim 1 or 2, wherein the molar ratio of the cobalt salt to the molybdate is (1-3): 1.
4. the process according to claim 1, wherein the molar ratio of metal salt to urea is (1 to 10): the metal salt includes nickel salt, cobalt salt and molybdate.
5. The method according to claim 1, wherein the mixed solution further contains ammonium fluoride.
6. The method according to claim 5, wherein the molar ratio of the metal salt to the ammonium fluoride is (1 to 10): the metal salt includes nickel salt, cobalt salt and molybdate.
7. The preparation method according to claim 1, characterized in that the temperature of the hydrothermal reaction is 100-200 ℃ and the time is 4-24 h.
8. The method according to claim 1, wherein the ratio of the nickel foam to the metal salt is 1cm 2 : 0.1-10 mmol, wherein the metal salt comprises nickel salt, cobalt salt and molybdate.
9. A self-supporting electrocatalytic hydrogen evolution catalyst electrode having a strained lattice prepared by the preparation method according to any one of claims 1 to 8.
10. Use of a self-supporting electrocatalytic hydrogen evolution catalyst electrode with a strained lattice as claimed in claim 9 as an electrocatalytic hydrogen evolution catalyst electrode.
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