CN115161700A - In-situ preparation and application of two-dimensional graphene-like nickel-molybdenum nitride composite material - Google Patents
In-situ preparation and application of two-dimensional graphene-like nickel-molybdenum nitride composite material Download PDFInfo
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- DDTIGTPWGISMKL-UHFFFAOYSA-N molybdenum nickel Chemical compound [Ni].[Mo] DDTIGTPWGISMKL-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 30
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000004202 carbamide Substances 0.000 claims abstract description 26
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 22
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 16
- 239000012498 ultrapure water Substances 0.000 claims abstract description 16
- 239000006260 foam Substances 0.000 claims abstract description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000001257 hydrogen Substances 0.000 claims abstract description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- 229910017855 NH 4 F Inorganic materials 0.000 claims abstract description 4
- 239000003792 electrolyte Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 239000002243 precursor Substances 0.000 claims description 22
- 229910021389 graphene Inorganic materials 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 12
- 229920002620 polyvinyl fluoride Polymers 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229910052723 transition metal Inorganic materials 0.000 abstract description 4
- -1 transition metal nitride Chemical class 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 20
- 238000003756 stirring Methods 0.000 description 10
- 150000004767 nitrides Chemical class 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000010970 precious metal Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- NLPVCCRZRNXTLT-UHFFFAOYSA-N dioxido(dioxo)molybdenum;nickel(2+) Chemical compound [Ni+2].[O-][Mo]([O-])(=O)=O NLPVCCRZRNXTLT-UHFFFAOYSA-N 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010411 electrocatalyst Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/091—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention relates to in-situ preparation and application of a two-dimensional graphene-like nickel-molybdenum nitride composite material, which are characterized in that Na is added 2 MoO 4 ·2H 2 O、Ni(NO 3 ) 2 ·6H 2 O、NH 4 F. After urea and ultrapure water are uniformly mixed, the treated nickel foam is added, and a two-dimensional graphene-like nickel-molybdenum nitride composite material is obtained by combining hydrothermal reaction and high-temperature roasting, so that the preparation method of the two-dimensional transition metal nitride is effectively expanded. The preparation method has the characteristics of simplicity, environmental protection and low price, and the two-dimensional graphene-like nickel-molybdenum nitride composite material has high electrocatalytic hydrogen evolution reaction characteristic in alkaline electrolyte.
Description
Technical Field
The invention relates to in-situ preparation and application of a two-dimensional graphene-like nickel-molybdenum nitride composite material, belonging to the field of preparation of materials.
Background
With the increasing environmental pollution and the increasing exhaustion of fossil energy. Therefore, the problem of fuel supply is solved, and the reduction of carbon emission is imminent. At present, hydrogen energy is widely concerned due to its cleanliness, environmental protection, and high combustion value, and is considered to be the most likely substance to replace traditional fossil energy. The electrocatalytic water decomposition technology is considered as an optimal method for preparing hydrogen energy efficiently and environmentally, and at present, precious metals have optimal electrocatalytic reaction activity, but the high price of the precious metals limits the large-scale application of the precious metals. Therefore, there is an urgent need to develop an efficient, inexpensive, stable, macroscopically quantifiable electrocatalyst to achieve the "hydrogen economy" blueprint.
In recent years, a transition metal nitride having a two-dimensional graphene-like structure has received much attention due to its excellent physicochemical properties (ACS Appl mate interfaces, 2020,12,5951-5957, inorg Chem.,2022,61, 9685-9692). Generally, the transition metal nitride of the two-dimensional graphene-like structure is converted from other two-dimensional materials, including oxides/hydroxides, sulfides, and even carbides. Most of the nitrides thereof are synthesized at high temperature and high pressure. Under such severe synthesis conditions, the control of the morphology, especially the control of the two-dimensional structure, is not favored.
Disclosure of Invention
The invention aims to provide in-situ preparation and application of a two-dimensional graphene-like nickel-molybdenum nitride composite material based on the purposes, and the technical scheme involved in the invention is as follows:
1. mixing Na 2 MoO 4 ·2H 2 O、Ni(NO 3 ) 2 ·6H 2 O、NH 4 F. After urea and ultrapure water are uniformly mixed, adding the treated foamed nickel, and carrying out hydrothermal reaction and high-temperature roasting to obtain the two-dimensional graphene-like nickel-molybdenum nitride composite material, wherein the two-dimensional graphene-like nickel-molybdenum nitride composite material is prepared by the following steps: 1) Na is mixed with 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Dissolving F (5 mmol) and urea (5 mmol) in 12mL of ultrapure water, transferring the solution into a hydrothermal reaction vessel (transferring the solution into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain a precursor; 2) And (3) placing the precursor in a tubular furnace under the protection of gas atmosphere, roasting for 2 hours at 450 ℃, heating up at the rate of 5 ℃/min, and cooling to room temperature to obtain the two-dimensional graphene nickel-molybdenum nitride composite material.
2. The two-dimensional graphene-like nickel-molybdenum nitride composite material is used for electro-catalysis hydrogen production at room temperature, and the current density is 10mA cm -2 And 50mA cm -2 When the two-dimensional graphene-like nickel-molybdenum nitride composite material is used, the overpotentials of the two-dimensional graphene-like nickel-molybdenum nitride composite material in the alkaline electrolyte are respectively 22mV and 117mV.
The invention has the following advantages:
1) In the invention, na is added 2 MoO 4 ·2H 2 O、Ni(NO 3 ) 2 ·6H 2 O、NH 4 F. After urea and ultrapure water are uniformly mixed, the treated nickel foam is added, and a two-dimensional graphene-like nickel-molybdenum nitride composite material is obtained by hydrothermal reaction combined with high-temperature roasting, so that the preparation method of the two-dimensional transition metal nitride is effectively expanded.
2) The preparation method has the characteristics of environmental protection, simplicity and large-scale preparation.
Drawings
FIG. 1 is a scanning electron microscope of the nitride Ni-MoN-450 obtained in example 1.
FIG. 2 is a transmission electron microscope of the nitride Ni-MoN-450 obtained in example 1.
FIG. 3 is an XRD spectrum of the nitride Ni-MoN-450 obtained in example 1.
FIG. 4 is an XPS spectrum of the nitride Ni-MoN-450 obtained in example 1.
FIG. 5 is a linear scan curve of the nitride Ni-MoN-450 obtained in example 1 under alkaline conditions.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Adding F (5 mmol) and urea (5 mmol) into a beaker, stirring until the F and the urea are dissolved, transferring the mixture into a hydrothermal reaction vessel (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the precursor. Placing the obtained precursor in a containerAnd (3) heating to 450 ℃ at the speed of 5 ℃/min in a tube furnace protected by gas atmosphere, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene nickel-molybdenum nitride composite material.
Fig. 1 and 2 are scanning electron microscope and transmission electron microscope images of a two-dimensional graphene-like nickel-molybdenum nitride composite material, from which a two-dimensional graphene structure of the material can be seen, the size width of the nanosheet is 200nm, and the thickness is 15nm.
Fig. 3 is an XRD spectrum of the two-dimensional graphene-like nickel-molybdenum nitride composite material, which shows that the obtained composite material is composed of Ni and MoN.
Fig. 4 is an XPS spectrum of a two-dimensional graphene-like nickel-molybdenum nitride composite material, which shows that the material contains nitrogen, carbon, molybdenum, nickel and oxygen.
Example 2
The specific preparation process of the nickel-molybdenum oxide is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Adding F (5 mmol) and urea (5 mmol) into a beaker, stirring until the F and the urea are dissolved, transferring the mixture into a hydrothermal reaction vessel (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated foamed nickel, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the nickel-molybdenum oxide composite material.
Example 3
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Adding F (5 mmol) and urea (5 mmol) into a beaker, stirring until the F and the urea are dissolved, transferring the mixture into a hydrothermal reaction vessel (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the precursor. Placing the obtained precursor in a tube furnace protected by gas atmosphere, heating to 350 ℃ at the speed of 5 ℃/min, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene nickel-nitrideA molybdenum composite material.
Example 4
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Adding F (5 mmol) and urea (5 mmol) into a beaker, stirring until the F and the urea are dissolved, transferring the mixture into a hydrothermal reaction vessel (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the precursor. And placing the obtained precursor in a tubular furnace protected by gas atmosphere, heating to 550 ℃ at the speed of 5 ℃/min, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene nickel-molybdenum nitride composite material.
Example 5
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(2mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Adding F (5 mmol) and urea (5 mmol) into a beaker, stirring until the F and urea are dissolved, transferring the mixture into a hydrothermal reaction container (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), putting the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain a precursor. And (3) placing the obtained precursor in a tube furnace protected by gas atmosphere, heating to 450 ℃ at the speed of 5 ℃/min, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene-like nickel-molybdenum nitride composite material.
Example 6
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(3mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Adding F (5 mmol) and urea (5 mmol) into a beaker, stirring until the F and urea are dissolved, transferring the mixture into a hydrothermal reaction container (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), and putting the hydrothermal reaction container into the hydrothermal reaction kettleAnd (3) heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the precursor. And (3) placing the obtained precursor in a tube furnace protected by gas atmosphere, heating to 450 ℃ at the speed of 5 ℃/min, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene-like nickel-molybdenum nitride composite material.
Example 7
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(3mmol)、NH 4 Adding F (5 mmol) and urea (5 mmol) into a beaker, stirring until the F and the urea are dissolved, transferring the mixture into a hydrothermal reaction vessel (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the precursor. And placing the obtained precursor in a tubular furnace protected by gas atmosphere, heating to 450 ℃ at the speed of 5 ℃/min, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene nickel-molybdenum nitride composite material.
Example 8
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(4mmol)、NH 4 Adding F (5 mmol) and urea (5 mmol) into a beaker, stirring until the F and the urea are dissolved, transferring the mixture into a hydrothermal reaction vessel (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the precursor. And placing the obtained precursor in a tubular furnace protected by gas atmosphere, heating to 450 ℃ at the speed of 5 ℃/min, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene nickel-molybdenum nitride composite material.
Example 9
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Adding F (6 mmol) and urea (5 mmol) into a beaker, stirring until the F and the urea are dissolved, transferring the mixture into a hydrothermal reaction vessel (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the precursor. And (3) placing the obtained precursor in a tube furnace protected by gas atmosphere, heating to 450 ℃ at the speed of 5 ℃/min, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene-like nickel-molybdenum nitride composite material.
Example 10
The specific preparation process of the two-dimensional graphene nickel-molybdenum nitride is as follows: 12mL of ultrapure water was added to a beaker, and then Na was added 2 MoO 4 ·2H 2 O(1mmol)、Ni(NO 3 ) 2 ·6H 2 O(2mmol)、NH 4 Adding F (5 mmol) and urea (6 mmol) into a beaker, stirring until the F and the urea are dissolved, transferring the mixture into a hydrothermal reaction vessel (transferring the mixture into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), adding the treated nickel foam, heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain the precursor. And placing the obtained precursor in a tubular furnace protected by gas atmosphere, heating to 450 ℃ at the speed of 5 ℃/min, roasting for 2 hours, and cooling to room temperature to obtain the two-dimensional graphene nickel-molybdenum nitride composite material.
Example 11
The product prepared in the example 1 is subjected to an electro-catalytic hydrogen evolution performance test, and the hydrogen evolution performance is tested on an electrochemical workstation by adopting a three-electrode method (reversible hydrogen is used as a reference electrode and a carbon rod is used as an auxiliary electrode) to achieve the current density of 10mA cm -2 And 50mA cm -2 When the two-dimensional graphene-like nickel-molybdenum nitride composite material is used, the overpotential of the two-dimensional graphene-like nickel-molybdenum nitride composite material in the alkaline electrolyte is 22mV and 117mV respectively.
Claims (2)
1. In-situ preparation and application of two-dimensional graphene-like nickel-molybdenum nitride composite material, the in-situ preparation method of the material comprises the following step of adding Na 2 MoO 4 ·2H 2 O、Ni(NO 3 ) 2 ·6H 2 O、NH 4 F. Uniformly mixing urea and ultrapure water, adding the treated nickel foam, and roasting at a high temperature through a hydrothermal reaction to obtain the two-dimensional graphene nickel-molybdenum nitride composite material, wherein the two-dimensional graphene nickel-molybdenum nitride composite material is prepared through the following steps: 1) Configuration of Na 2 MoO 4 ·2H 2 O(1～3mmol)、Ni(NO 3 ) 2 ·6H 2 O(2～4mmol)、NH 4 Dissolving F (5-6 mmol) and urea (5-6 mmol) in 12mL of ultrapure water, adding the treated nickel foam, transferring the nickel foam into a hydrothermal reaction vessel (transferring the nickel foam into a stainless steel hydrothermal reaction kettle with a polyvinyl fluoride lining), heating the solution at 120 ℃ for 6 hours, and then heating and drying the solution at 60 ℃ in vacuum to obtain a precursor; 2) And (3) placing the precursor in a tube furnace under the protection of gas atmosphere, roasting for 2 hours at 450 ℃, heating at the rate of 5 ℃/min, and cooling to room temperature to obtain the two-dimensional graphene nickel-molybdenum nitride composite material.
2. The method of claim 1, wherein:
the two-dimensional graphene-like nickel-molybdenum nitride composite material is used for electro-catalysis hydrogen production at room temperature, and the current density is 10mA cm -2 And 50mA cm -2 When the two-dimensional graphene-like nickel-molybdenum nitride composite material is used, the overpotential in the alkaline electrolyte is 22mV and 117mV respectively.
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