CN116377497A - Preparation method and application of self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst - Google Patents
Preparation method and application of self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst Download PDFInfo
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- 239000002073 nanorod Substances 0.000 title claims abstract description 38
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- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 229910002551 Fe-Mn Inorganic materials 0.000 title claims abstract description 18
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000006260 foam Substances 0.000 claims abstract description 25
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- 239000002243 precursor Substances 0.000 claims abstract description 19
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 9
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- 238000006243 chemical reaction Methods 0.000 claims description 80
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- 238000003756 stirring Methods 0.000 claims description 39
- 239000011669 selenium Substances 0.000 claims description 34
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- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims description 28
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 23
- 239000003513 alkali Substances 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 18
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- 238000001291 vacuum drying Methods 0.000 claims description 18
- 238000005406 washing Methods 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
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 10
- 239000004202 carbamide Substances 0.000 claims description 10
- QGUAJWGNOXCYJF-UHFFFAOYSA-N cobalt dinitrate hexahydrate Chemical compound O.O.O.O.O.O.[Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QGUAJWGNOXCYJF-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- AOPCKOPZYFFEDA-UHFFFAOYSA-N nickel(2+);dinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O AOPCKOPZYFFEDA-UHFFFAOYSA-N 0.000 claims description 10
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 claims description 8
- ALIMWUQMDCBYFM-UHFFFAOYSA-N manganese(2+);dinitrate;tetrahydrate Chemical compound O.O.O.O.[Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ALIMWUQMDCBYFM-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 238000003760 magnetic stirring Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 31
- 238000005868 electrolysis reaction Methods 0.000 abstract description 14
- 239000001257 hydrogen Substances 0.000 abstract description 14
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 12
- 239000000758 substrate Substances 0.000 abstract description 8
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- 229910003266 NiCo Inorganic materials 0.000 description 16
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- 239000011572 manganese Substances 0.000 description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 8
- 229910052748 manganese Inorganic materials 0.000 description 8
- 230000035484 reaction time Effects 0.000 description 8
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 7
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- 239000002803 fossil fuel Substances 0.000 description 4
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- 229910052760 oxygen Inorganic materials 0.000 description 4
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- 229910003267 Ni-Co Inorganic materials 0.000 description 3
- 229910003262 Ni‐Co Inorganic materials 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
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- VREFGVBLTWBCJP-UHFFFAOYSA-N alprazolam Chemical compound C12=CC(Cl)=CC=C2N2C(C)=NN=C2CN=C1C1=CC=CC=C1 VREFGVBLTWBCJP-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
-
- 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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Abstract
The invention discloses a preparation method and application of a self-supporting ferromanganese co-doped nickel cobalt selenide nanorod array catalyst, belonging to the technical field of electrocatalytic materials, and comprising the following steps: and preparing a precursor of the Fe-Mn co-doping by using foam nickel as a growth substrate and firstly preparing a Ni source, a Co source, an Fe source and a Mn source according to a certain stoichiometric ratio by a hydrothermal method, and then carrying out selenizing treatment to obtain the catalyst. The invention utilizes low-cost and abundant transition metal element double doping to adjust the electronic structure of the bimetallic selenide, thereby improving the intrinsic activity thereof; the active site and specific surface area of the catalyst are increased by the nano rod array structure, and the apparent activity of the catalyst is improved; the conductive substrate foam nickel improves the conductivity and stability of the catalyst, so that the activity and stability of the electrolytic water are synergistically promoted, and the conductive substrate foam nickel is applied to hydrogen production by water electrolysis, and the water electrolysis efficiency is improved. The preparation method is simple and is easy for batch preparation.
Description
Technical Field
The invention relates to the technical field of electrocatalytic material preparation, in particular to a preparation method and application of a self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst, and the prepared material is used in the technical field of water electrolysis hydrogen production.
Background
Traditional fossil fuels such as coal, petroleum, natural gas and the like are still a main source of energy, however, the reserves of fossil energy are limited, the energy utilization rate is not high, and the use requirements of people are difficult to meet. Moreover, fossil fuels are non-renewable energy sources, and large consumption can lead to serious energy crisis and environmental pollution problems. The renewable clean energy can be developed to effectively relieve energy crisis, reduce the emission of atmospheric pollutants and improve the ecological environment, thereby realizing sustainable development of human society. Solar, wind and tidal energy are typical renewable energy sources that can reduce fossil fuel consumption, but due to seasonal and regional factors, these energy sources are not controllable and predictable over time, thus severely limiting their large-scale use. Therefore, there is an urgent need to develop energy storage and conversion technologies to fully utilize these renewable energy sources.
In recent years, many advanced energy storage and conversion technologies have been rapidly developed, such as metal-ion batteries, metal-air batteries, supercapacitors, photoelectrocatalytic hydrogen production, and fuel cells. Hydrogen (H) 2 ) The energy source has the characteristics of high specific energy density, no pollution in combustion, abundant sources, compressible storage, convenient transportation and the like, and is considered as a 'final energy source' for replacing fossil fuel. And the hydrogen energy is used as an ideal energy storage medium, and can convert unstable solar energy, wind energy and tidal energy into stable chemical energy. Electrocatalytic water splitting (OWS) is an important way to obtain hydrogen energy, but its anodic Oxygen Evolution Reaction (OER) and cathodic Hydrogen Evolution Reaction (HER) are kinetically slow reactions, requiring higher voltages to overcome the reaction energy barrier, severely limiting the electrolyzed water conversion efficiency. Numerous studies have shown that the most efficient OER and HER catalysts are still RuO 2 /IrO 2 And noble metal materials such as Pt, but the reserves are scarce and the price is high, so that the practical application prospect is very limited. Therefore, the reasonable design of the low-cost, high-performance and rich-reserve non-noble metal catalyst plays a vital role in developing the water electrolysis hydrogen production technology and relieving the energy and environmental problems.
Transition metals have unpaired electrons and unfilled orbitals, empty d electron orbitals that can form chemisorbed bonds, and the adsorption sites of transition metals are diverse and therefore commonly used to prepare electrocatalysts. The transition metal selenide has the characteristics of good conductivity, low price, high activity, easy preparation and the like, and is widely focused by researchers. The transition metal catalytic active center has adjustable redox properties so that the transition metal selenide has excellent electrocatalytic performance. Furthermore, the low band gap and high covalency of the transition metal selenide enhances the charge transport properties, making it more conductive and more active sites than the corresponding oxide. Doping of heterogeneous elements can increase active sites and regulate electronic structures, thereby improving electrocatalytic activity. The self-supporting array structure constructed by combining the conductive substrate can improve the conductivity and stability of the catalyst. Therefore, in view of the characteristics, the self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst is prepared. The catalyst has excellent water electrolysis activity and stability, and can effectively improve the water electrolysis efficiency.
Disclosure of Invention
The invention aims to provide a preparation method of a self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst. And (3) taking foam nickel as a growth substrate, and preparing the self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst through a hydrothermal method and selenizing treatment. The second purpose of the invention is to apply the self-supporting Fe-Mn co-doped nickel cobalt selenide nanorod array catalyst prepared by the method to hydrogen production by water electrolysis. The electronic structure of the nickel cobalt selenide is effectively regulated and controlled through doping, the catalytic active site and the specific surface area are increased through the nano rod array structure, and the conductivity and the stability of the conductive substrate foam nickel are improved, so that the improvement of the water electrolysis performance is promoted.
The invention is realized by the following technical scheme: the preparation method of the self-supporting Fe-Mn co-doped nickel cobalt selenide nanorod array catalyst comprises the following steps:
(1) The molar ratio is 1mmol: 1-2 mmol:0 to 0.3mmol:0 to 0.3mmol: 3-10 mmol: 1-5 mmol of nickel nitrate hexahydrate, cobalt nitrate hexahydrate, ferric nitrate nonahydrate, manganese nitrate tetrahydrate, urea and ammonium fluoride are placed in a beaker, 20mL of deionized water is added, the mixture is stirred magnetically at constant temperature, after being stirred uniformly, the mixture is placed in a 50mL high-pressure reaction kettle in which pretreated foam nickel is placed, and the mixture is subjected to full hydrothermal reaction in a blast drying box, wherein the hydrothermal reaction temperature is 100-160 ℃, and the heat preservation time is 3-12 h;
(2) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for a plurality of times in sequence, and putting the reaction product into a vacuum drying oven for drying to obtain a ferro-manganese co-doped precursor material;
(3) The mass ratio is 0.1-0.2 g: 1.5-5 g of selenium powder and sodium hydroxide are placed in a beaker, 20mL of deionized water is added, constant-temperature magnetic stirring is carried out, the mixture is placed in a high-pressure reaction kettle after uniform stirring, the mixture is subjected to full hydrothermal reaction in a blast drying box, the hydrothermal reaction temperature is 160-200 ℃, and the heat preservation time is 6-24 hours, so that an alkali solution containing selenium is obtained;
(4) The prepared precursor and the selenium-containing alkali solution are put into a high-pressure reaction kettle, and are subjected to full hydrothermal reaction in a blast drying box, wherein the hydrothermal reaction temperature is 100-160 ℃, and the heat preservation time is 3-12 h;
(5) And (3) naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for a plurality of times, and putting the reaction product into a vacuum drying oven for drying to obtain the self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst.
And (3) sequentially carrying out ultrasonic treatment on the foam nickel in the step (1) by using 1mol/L hydrochloric acid, absolute ethyl alcohol and deionized water for 10min.
The magnetic stirring time is 10-30 min, and the stirring speed is 650-850 r/min.
The hydrothermal reaction products are washed with absolute ethyl alcohol and deionized water for 3 times in sequence.
The drying temperature of the washed hydrothermal reaction product is 60 ℃, and the heat preservation time is 12 hours.
The nickel nitrate hexahydrate, cobalt nitrate hexahydrate, ferric nitrate nonahydrate, manganese nitrate tetrahydrate, urea, ammonium fluoride, selenium powder, sodium hydroxide, absolute ethyl alcohol and potassium hydroxide used in the invention are all analytically pure and purchased from Shanghai microphone Lin Shenghua Co.
The invention has the beneficial effects that:
1. the self-supporting Fe-Mn co-doped nickel-cobalt selenide catalytic material is directly prepared on the foam nickel substrate by a hydrothermal method, so that the use of a binder and a conductive agent is avoided, and the preparation process is simplified and the cost is reduced.
2. The catalyst obtained by the preparation method has a rough nano rod array structure, a large number of gaps and channels are formed among the arrays, and the catalyst can provide high specific surface area and rich active sites, so that the apparent activity of the catalyst is improved; the doping energy of the heterogeneous elements can regulate and control the electronic structure of the catalyst and optimize the adsorption energy of the reaction intermediate, so that the intrinsic activity of the catalyst is improved; the self-supporting structure is constructed by taking the foam nickel as a substrate, so that the conductivity and the stability of the self-supporting structure can be improved. The catalyst prepared by the invention can show excellent activity and stability of electrolyzed water, and has been successfully applied to hydrogen production by water electrolysis.
3. The preparation method is simple, low in cost, high in yield, easy for batch preparation and wide in industrial application prospect.
Drawings
FIG. 1 is a diagram of Fe, mn-NiCo prepared in example 1 2 Se 4 X-ray diffraction (XRD) pattern of NF-6 catalyst.
FIG. 2 is a diagram of Fe, mn-NiCo prepared in example 1 2 Se 4 Scanning Electron Microscope (SEM) image of NF-6 catalyst.
FIG. 3 is a diagram of Fe, mn-NiCo prepared in example 1 2 Se 4 Oxygen Evolution (OER) polarization curve of the NF-6 catalyst.
FIG. 4 is a diagram of Fe, mn-NiCo prepared in example 1 2 Se 4 Hydrogen Evolution (HER) polarization profile for NF-6 catalyst.
FIG. 5 is a diagram of Fe, mn-NiCo prepared in example 1 2 Se 4 Electrolyzed water (OWS) polarization graph of NF-6 catalyst.
FIG. 6 is a diagram of Fe, mn-NiCo prepared in example 1 2 Se 4 Electrolytic Water (OWS) stability test E-t graph of NF-6 catalyst.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and the implementation examples.
Example 1
The embodiment is an example of a preparation method of the self-supporting ferromanganese co-doped nickel cobalt selenide nanorod array catalyst, which comprises the following steps:
(1) Placing 1mmol of nickel nitrate hexahydrate, 2mmol of cobalt nitrate hexahydrate, 0.2mmol of ferric nitrate nonahydrate, 0.2mmol of manganese nitrate tetrahydrate, 5mmol of urea and 1mmol of ammonium fluoride in a beaker, and adding 20mL of deionized water for mixing to obtain a mixed solution;
(2) Magnetically stirring the obtained mixed solution at constant temperature for 30min at a stirring speed of 800r/min until all solids are dissolved uniformly;
(3) Placing the uniform mixed solution in a high-pressure reaction kettle in which pre-treated foam nickel is placed, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 8 hours at 120 ℃;
(4) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain a precursor sample co-doped with iron and manganese;
(5) Placing 0.15g of selenium powder and 2g of sodium hydroxide into a beaker, adding 20mL of deionized water, magnetically stirring at a constant temperature for 30min and a stirring speed of 800r/min, uniformly stirring, placing into a high-pressure reaction kettle, and placing into a blast drying oven for fully reacting for 12h at 180 ℃ to obtain an alkali solution containing selenium;
(6) And placing the precursor sample and the selenium-containing alkali solution in a high-pressure reaction kettle, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 6 hours at 120 ℃. And (3) naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain the nickel cobalt selenide nanorod array catalyst which directly grows on the foam nickel and is co-doped with iron and manganese. As shown in FIG. 1, XRD diffraction peaks of the prepared nickel cobalt selenide and NiCo 2 Se 4 (PDF#04-006-5241) and the morphology of the nickel cobalt selenide shown in FIG. 2 is typical of a nanorod array structure. As the selenization reaction time is 6h, the product obtained in the embodiment adopts Fe, mn-NiCo 2 Se 4 NF-6, the following is similar.
Example 2
The embodiment is a comparative example of the preparation method of the self-supporting Fe-Mn co-doped Ni-Co selenide nanorod array catalyst, which is undoped and comprises the following steps:
(1) Placing 1mmol of nickel nitrate hexahydrate, 2mmol of cobalt nitrate hexahydrate, 5mmol of urea and 1mmol of ammonium fluoride in a beaker, and adding 20mL of deionized water for mixing to obtain a mixed solution;
(2) Magnetically stirring the obtained mixed solution at constant temperature for 30min at a stirring speed of 800r/min until all solids are dissolved uniformly;
(3) Placing the uniform mixed solution in a high-pressure reaction kettle in which pre-treated foam nickel is placed, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 8 hours at 120 ℃;
(4) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain an undoped precursor sample;
(5) Placing 0.15g of selenium powder and 2g of sodium hydroxide into a beaker, adding 20mL of deionized water, magnetically stirring at a constant temperature for 30min and a stirring speed of 800r/min, uniformly stirring, placing into a high-pressure reaction kettle, and placing into a blast drying oven for fully reacting for 12h at 180 ℃ to obtain an alkali solution containing selenium;
(6) And placing the precursor sample and the selenium-containing alkali solution in a high-pressure reaction kettle, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 6 hours at 120 ℃. And (3) naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain the nickel cobalt selenide nanorod array catalyst which directly grows on the foam nickel. The product obtained in this example, due to undoped nature, is NiCo 2 Se 4 and/NF-6.
Example 3
The embodiment is still another comparative example of the preparation method of the self-supporting Fe-Mn co-doped Ni-Co selenide nanorod array catalyst, which is only doped with Fe and comprises the following steps:
(1) Placing 1mmol of nickel nitrate hexahydrate, 2mmol of cobalt nitrate hexahydrate, 0.2mmol of ferric nitrate nonahydrate, 5mmol of urea and 1mmol of ammonium fluoride in a beaker, and adding 20mL of deionized water for mixing to obtain a mixed solution;
(2) Magnetically stirring the obtained mixed solution at constant temperature for 30min at a stirring speed of 800r/min until all solids are dissolved uniformly;
(3) Placing the uniform mixed solution in a high-pressure reaction kettle in which pre-treated foam nickel is placed, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 8 hours at 120 ℃;
(4) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain an iron-doped precursor sample;
(5) Placing 0.15g of selenium powder and 2g of sodium hydroxide into a beaker, adding 20mL of deionized water, magnetically stirring at a constant temperature for 30min and a stirring speed of 800r/min, uniformly stirring, placing into a high-pressure reaction kettle, and placing into a blast drying oven for fully reacting for 12h at 180 ℃ to obtain an alkali solution containing selenium;
(6) And placing the precursor sample and the selenium-containing alkali solution in a high-pressure reaction kettle, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 6 hours at 120 ℃. And (3) naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain the iron-doped nickel cobalt selenide nanorod array catalyst which directly grows on the foam nickel. The product obtained in this example uses Fe-NiCo due to the doping of only Fe 2 Se 4 and/NF-6.
Example 4
The embodiment is another comparative example of the preparation method of the self-supporting iron-manganese co-doped nickel-cobalt selenide nanorod array catalyst, which is only doped with Mn, and comprises the following steps:
(1) Placing 1mmol of nickel nitrate hexahydrate, 2mmol of cobalt nitrate hexahydrate, 0.2mmol of manganese nitrate tetrahydrate, 5mmol of urea and 1mmol of ammonium fluoride in a beaker, and adding 20mL of deionized water for mixing to obtain a mixed solution;
(2) Magnetically stirring the obtained mixed solution at constant temperature for 30min at a stirring speed of 800r/min until all solids are dissolved uniformly;
(3) Placing the uniform mixed solution in a high-pressure reaction kettle in which pre-treated foam nickel is placed, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 8 hours at 120 ℃;
(4) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain a manganese-doped precursor sample;
(5) Placing 0.15g of selenium powder and 2g of sodium hydroxide into a beaker, adding 20mL of deionized water, magnetically stirring at a constant temperature for 30min and a stirring speed of 800r/min, uniformly stirring, placing into a high-pressure reaction kettle, and placing into a blast drying oven for fully reacting for 12h at 180 ℃ to obtain an alkali solution containing selenium;
(6) And placing the precursor sample and the selenium-containing alkali solution in a high-pressure reaction kettle, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 6 hours at 120 ℃. And (3) naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain the manganese-doped nickel cobalt selenide nanorod array catalyst which directly grows on the foam nickel. The product obtained in this example uses Mn-NiCo due to the doping of Mn only 2 Se 4 and/NF-6.
Example 5
The embodiment is another example of the preparation method of the self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst, which comprises the following steps:
(1) Placing 1mmol of nickel nitrate hexahydrate, 2mmol of cobalt nitrate hexahydrate, 0.2mmol of ferric nitrate nonahydrate, 0.2mmol of manganese nitrate tetrahydrate, 5mmol of urea and 1mmol of ammonium fluoride in a beaker, and adding 20mL of deionized water for mixing to obtain a mixed solution;
(2) Magnetically stirring the obtained mixed solution at constant temperature for 30min at a stirring speed of 800r/min until all solids are dissolved uniformly;
(3) Placing the uniform mixed solution in a high-pressure reaction kettle in which pre-treated foam nickel is placed, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 8 hours at 120 ℃;
(4) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain a precursor sample co-doped with iron and manganese;
(5) Placing 0.15g of selenium powder and 2g of sodium hydroxide into a beaker, adding 20mL of deionized water, magnetically stirring at a constant temperature for 30min, stirring at a speed of 800r/min, uniformly stirring, placing into a high-pressure reaction kettle, and placing into a blast drying oven for fully reacting for 12h at 180 ℃ to obtain the selenium-containing alkali solution.
(6) And placing the precursor sample and the selenium-containing alkali solution in a high-pressure reaction kettle, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 3 hours at 120 ℃. And (3) naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain the nickel cobalt selenide nanorod array catalyst which directly grows on the foam nickel and is co-doped with iron and manganese. As the selenization reaction time is 3h, the product obtained in the embodiment adopts Fe, mn-NiCo 2 Se 4 and/NF-3.
Example 6
The embodiment is another example of the preparation method of the self-supporting Fe-Mn co-doped Ni-Co selenide nanorod array catalyst, and the selenizing reaction time is different, and the method comprises the following steps:
(1) Placing 1mmol of nickel nitrate hexahydrate, 2mmol of cobalt nitrate hexahydrate, 0.2mmol of ferric nitrate nonahydrate, 0.2mmol of manganese nitrate tetrahydrate, 5mmol of urea and 1mmol of ammonium fluoride in a beaker, and adding 20mL of deionized water for mixing to obtain a mixed solution;
(2) Magnetically stirring the obtained mixed solution at constant temperature for 30min at a stirring speed of 800r/min until all solids are dissolved uniformly;
(3) Placing the uniform mixed solution in a high-pressure reaction kettle in which pre-treated foam nickel is placed, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 8 hours at 120 ℃;
(4) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain a precursor sample co-doped with iron and manganese;
(5) Placing 0.15g of selenium powder and 2g of sodium hydroxide into a beaker, adding 20mL of deionized water, magnetically stirring at a constant temperature for 30min, stirring at a speed of 800r/min, uniformly stirring, placing into a high-pressure reaction kettle, and placing into a blast drying oven for fully reacting for 12h at 180 ℃ to obtain the selenium-containing alkali solution.
(6) And placing the precursor sample and the selenium-containing alkali solution in a high-pressure reaction kettle, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 9 hours at 120 ℃. And (3) naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain the nickel cobalt selenide nanorod array catalyst which directly grows on the foam nickel and is co-doped with iron and manganese. As the selenization reaction time is 9h, the product obtained in the embodiment adopts Fe, mn-NiCo 2 Se 4 and/NF-9.
Example 7
The embodiment is a 7 th example of a preparation method of the self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst, and the selenizing reaction time is different, and the method comprises the following steps:
(1) Placing 1mmol of nickel nitrate hexahydrate, 2mmol of cobalt nitrate hexahydrate, 0.2mmol of ferric nitrate nonahydrate, 0.2mmol of manganese nitrate tetrahydrate, 5mmol of urea and 1mmol of ammonium fluoride in a beaker, and adding 20mL of deionized water for mixing to obtain a mixed solution;
(2) Magnetically stirring the obtained mixed solution at constant temperature for 30min at a stirring speed of 800r/min until all solids are dissolved uniformly;
(3) Placing the uniform mixed solution in a high-pressure reaction kettle in which pre-treated foam nickel is placed, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 8 hours at 120 ℃;
(4) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for 3 times in sequence, putting the reaction product into a vacuum drying oven at 60 ℃ for 12 hours, and drying the reaction product to obtain a precursor sample co-doped with iron and manganese;
(5) Placing 0.15g of selenium powder and 2g of sodium hydroxide into a beaker, adding 20mL of deionized water, magnetically stirring at a constant temperature for 30min and a stirring speed of 800r/min, uniformly stirring, placing into a high-pressure reaction kettle, and placing into a blast drying oven for fully reacting for 12h at 180 ℃ to obtain an alkali solution containing selenium;
(6) And placing the precursor sample and the selenium-containing alkali solution in a high-pressure reaction kettle, and placing the high-pressure reaction kettle in a blast drying box for full reaction for 12 hours at 120 ℃. Naturally cooling the high-pressure reaction kettle, taking out the reaction product, sequentially using absolute ethyl alcohol and deionized waterWashing with water for 3 times, putting into a vacuum drying oven at 60 ℃ for 12 hours, and drying to obtain the nickel cobalt selenide nanorod array catalyst which directly grows on the foam nickel and is co-doped with iron and manganese. As the selenizing reaction time is 12h, the product obtained in the embodiment adopts Fe, mn-NiCo 2 Se 4 and/NF-12.
Table 1 results of performance testing of nickel cobalt selenide nanorod array catalysts obtained under different test conditions
From the results in Table 1, it can be seen that the electrocatalytic performance of the nickel cobalt selenide prepared according to the present invention is related to factors such as doping of elements and hydrothermal reaction time. The self-supporting nickel cobalt selenide nanorod array catalyst prepared by the method has excellent oxygen evolution, hydrogen evolution and water electrolysis performances. The electronic structure of the catalyst can be regulated and controlled and the active site can be increased by doping elements, so that the water electrolysis performance of the catalyst is further improved. In addition, the material with better appearance, structure and performance can be obtained by reasonable reaction time. Thus, the Fe, mn-NiCo described in example 1 2 Se 4 The NF-6 nano rod array catalyst has better oxygen evolution, hydrogen evolution and water electrolysis activities (shown in figures 3-5), and shows excellent water electrolysis stability (shown in figure 6), can be applied to high-efficiency water electrolysis hydrogen production, and has wide application prospect.
Electrocatalytic activity and stability evaluation of the catalyst prepared by the invention: the electrochemical workstation is used for scanning polarization curves of catalyst materials through cyclic voltammetry and linear voltammetry, and analyzing electrocatalytic activity performances such as peak potential, overpotential of specific current density, tafil slope and the like, and the electrochemical method of timing potential is used for preparing Fe, mn-NiCo 2 Se 4 The stability of the NF-6 nanorod array catalyst material was tested.
Claims (5)
1. The preparation method of the self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst is characterized by comprising the following steps of:
(1) The molar ratio is 1mmol: 1-2 mmol:0 to 0.3mmol:0 to 0.3mmol: 3-10 mmol: 1-5 mmol of nickel nitrate hexahydrate, cobalt nitrate hexahydrate, ferric nitrate nonahydrate, manganese nitrate tetrahydrate, urea and ammonium fluoride are placed in a beaker, 20mL of deionized water is added, the mixture is stirred magnetically at constant temperature, after being stirred uniformly, the mixture is placed in a 50mL high-pressure reaction kettle in which pretreated foam nickel is placed, and the mixture is subjected to full hydrothermal reaction in a blast drying box, wherein the hydrothermal reaction temperature is 100-160 ℃, and the heat preservation time is 3-12 h;
(2) Naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for a plurality of times in sequence, and putting the reaction product into a vacuum drying oven for drying to obtain a ferro-manganese co-doped precursor material;
(3) The mass ratio is 0.1-0.2 g: 1.5-5 g of selenium powder and sodium hydroxide are placed in a beaker, 20mL of deionized water is added, constant-temperature magnetic stirring is carried out, the mixture is placed in a high-pressure reaction kettle after uniform stirring, the mixture is subjected to full hydrothermal reaction in a blast drying box, the hydrothermal reaction temperature is 160-200 ℃, and the heat preservation time is 6-24 hours, so that an alkali solution containing selenium is obtained;
(4) The prepared precursor and the selenium-containing alkali solution are put into a high-pressure reaction kettle, and are subjected to full hydrothermal reaction in a blast drying box, wherein the hydrothermal reaction temperature is 100-160 ℃, and the heat preservation time is 3-12 h;
(5) And (3) naturally cooling the high-pressure reaction kettle, taking out a reaction product, washing the reaction product with absolute ethyl alcohol and deionized water for a plurality of times, and putting the reaction product into a vacuum drying oven for drying to obtain the self-supporting Fe-Mn co-doped nickel-cobalt selenide nanorod array catalyst.
2. The method for preparing the self-supporting ferromanganese co-doped nickel cobalt selenide nanorod array catalyst according to claim 1, wherein the foam nickel in the step (1) is treated by sequentially using 1mol/L hydrochloric acid, absolute ethyl alcohol and deionized water for 10min in an ultrasonic manner.
3. The method for preparing the self-supporting ferromanganese co-doped nickel cobalt selenide nanorod array catalyst according to claim 1, wherein the magnetic stirring time is 10-30 min, and the stirring speed is 650-850 r/min.
4. The method for preparing the self-supporting iron-manganese co-doped nickel-cobalt selenide nanorod array catalyst according to claim 1, wherein the hydrothermal reaction products are washed with absolute ethyl alcohol and deionized water for 3 times in sequence.
5. The method for preparing the self-supporting ferromanganese co-doped nickel cobalt selenide nanorod array catalyst according to claim 1, wherein the drying temperature of the washed hydrothermal reaction product is 60 ℃, and the heat preservation time is 12h.
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| CN116516392B (en) * | 2023-07-03 | 2023-10-13 | 北京化工大学 | CoSe nano-sheet electrocatalyst with cation vacancy and preparation method and application thereof |
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