CN116024607A - Preparation and use methods of catalyst for producing hydrogen by electrolyzing water through iron-nickel or iron-copper - Google Patents
Preparation and use methods of catalyst for producing hydrogen by electrolyzing water through iron-nickel or iron-copper Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 46
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000001257 hydrogen Substances 0.000 title claims abstract description 35
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 19
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 239000002243 precursor Substances 0.000 claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000010949 copper Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000010041 electrostatic spinning Methods 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 239000002135 nanosheet Substances 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000002105 nanoparticle Substances 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000009941 weaving Methods 0.000 claims abstract description 7
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 claims abstract description 6
- MQRWBMAEBQOWAF-UHFFFAOYSA-N acetic acid;nickel Chemical compound [Ni].CC(O)=O.CC(O)=O MQRWBMAEBQOWAF-UHFFFAOYSA-N 0.000 claims abstract description 5
- PVFSDGKDKFSOTB-UHFFFAOYSA-K iron(3+);triacetate Chemical compound [Fe+3].CC([O-])=O.CC([O-])=O.CC([O-])=O PVFSDGKDKFSOTB-UHFFFAOYSA-K 0.000 claims abstract description 5
- 229940078494 nickel acetate Drugs 0.000 claims abstract description 5
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 34
- 229910002555 FeNi Inorganic materials 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 18
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 18
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 17
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000000197 pyrolysis Methods 0.000 claims description 11
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 10
- SCWWDULYYDFWQV-UHFFFAOYSA-N (2-hydroxyphenoxy)boronic acid Chemical compound OB(O)OC1=CC=CC=C1O SCWWDULYYDFWQV-UHFFFAOYSA-N 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 229920000557 Nafion® Polymers 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- 229910021397 glassy carbon Inorganic materials 0.000 claims description 3
- 239000002815 homogeneous catalyst Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 3
- 239000012498 ultrapure water Substances 0.000 claims description 3
- 230000003197 catalytic effect Effects 0.000 abstract description 13
- 239000000126 substance Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 2
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- 238000005868 electrolysis reaction Methods 0.000 description 11
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- 239000000523 sample Substances 0.000 description 7
- 229910000510 noble metal Inorganic materials 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
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- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910052723 transition metal Inorganic materials 0.000 description 3
- 150000003624 transition metals Chemical class 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 238000001000 micrograph Methods 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000011865 Pt-based catalyst Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000002194 amorphous carbon material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
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- 239000010411 electrocatalyst Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- -1 iron metals Chemical class 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000002064 nanoplatelet Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- AIYYMMQIMJOTBM-UHFFFAOYSA-L nickel(ii) acetate Chemical compound [Ni+2].CC([O-])=O.CC([O-])=O AIYYMMQIMJOTBM-UHFFFAOYSA-L 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
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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 discloses a preparation and application method of a catalyst for producing hydrogen by electrolyzing water through iron-nickel or iron-copper, which is characterized by comprising the following steps: dissolving PVP powder and HBA into DMF to prepare slurry; slowly adding ferric acetate and nickel acetate or copper acetate into the prepared slurry, and stirring to obtain uniform precursor slurry; and weaving the precursor slurry into a precursor network by utilizing an electrostatic spinning technology, and preparing the novel three-dimensional iron and copper nanoparticle coated and B and N co-doped multilayer porous carbon nano sheet. The catalyst prepared by the invention has a multi-layer porous physical structure, excellent charge transfer capability and rich active sites, and has excellent water-splitting catalytic activity, and the three-dimensional porous layered structure enables the material to have obvious structural characteristics and stable chemical property, and shows excellent stability in a two-electrode electrolytic cell; the catalytic activity of water cracking is high.
Description
Technical Field
The invention belongs to the technical field of hydrogen production catalysts by water electrolysis, and particularly relates to a preparation and use method of an iron-nickel or iron-copper hydrogen production catalyst by water electrolysis.
Background
The increasing consumption of fossil fuels leads to a series of problems such as air pollution, energy shortage, and global warming. Therefore, development of clean energy is imperative. Hydrogen energy has high energy density and no pollution, is an excellent energy carrier, and is a potential candidate of a future low-carbon energy system. Hydrogen Evolution Reactions (HER) generate molecular hydrogen by electrochemical reduction of water is one of the key processes that limit the efficiency of water splitting devices. Meanwhile, oxygen Evolution Reaction (OER) is a key process of fuel cells in general, and OER is inevitably affected by kinetic retardation without assistance of a high-efficiency catalyst, which limits the efficiency of the water splitting device and the fuel cell.
Currently, the main mode of commercial hydrogen production is the production of hydrogen from reforming fossil energy sources such as natural gas, coal, etc. Although the cost is low, carbon recycling cannot be avoided. The hydrogen production by water electrolysis has the advantages of cleanness, high efficiency and sustainability. However, the catalysts currently used for producing hydrogen by water electrolysis are noble metal catalysts, which results in high cost of producing hydrogen by water electrolysis. Noble metal-based catalysts (particularly Pt-based catalysts) exhibit good reaction rates for OER. However, platinum metal resources are scarce, costly, and poor in stability, still hampering their practical use. In the future, in order to realize commercial application of hydrogen production by water electrolysis, it is necessary to develop an efficient and inexpensive non-noble metal catalyst.
Compared with noble metals Pt, ru and Ir, the transition metal has the characteristics of large storage capacity on earth, low price, low toxicity, wider application range and the like. Currently, electrocatalysts developed based on transition metals have been demonstrated to be capable of catalyzing OER reactions. Among them, the catalyst based on Fe and Ni or Cu synthesis has a better catalytic effect. The cost of the catalyst for hydrogen production by water electrolysis and hydrogen fuel cells is expected to be further reduced.
Therefore, it is vital in the future to develop new energy devices (especially hydrogen fuel cells) to design efficient catalysts based on the earth's abundant and inexpensive elements to promote OER catalysis.
In order to solve the problems, a preparation method and a use method of an iron-nickel or iron-copper catalyst for water electrolysis hydrogen production are provided.
Disclosure of Invention
In order to solve the technical problems, the invention designs a preparation and use method of an iron-nickel or iron-copper water electrolysis hydrogen production catalyst, which has a multi-layer porous physical structure, excellent charge transfer capability and rich active sites, so that the catalyst has excellent water electrolysis catalytic activity, and the three-dimensional porous layered structure enables the material to have obvious structural characteristics and stable chemical property, and shows excellent stability in a two-electrode electrolytic tank; the method of the invention is a novel method for doping more B/N hetero atoms in the cheap metal catalyst, thereby improving the water cracking catalytic activity of the catalyst.
In order to achieve the technical effects, the invention is realized by the following technical scheme: the preparation and use method of the catalyst for producing hydrogen by electrolyzing water through iron nickel or iron copper is characterized by comprising the following steps:
step1: according to the mass ratio of 3-5: 1-2, weighing polyvinylpyrrolidone (PVP) powder and hydroxyphenylboric acid (HBA), dissolving the polyvinylpyrrolidone powder and the hydroxyphenylboric acid (HBA) into N, N-Dimethylformamide (DMF), and preparing HBA-PVP-DMF slurry by 30-50 ml of DMF per gram of HBA;
step2: iron acetate [ Fe (AC) 2 ·4H 2 O]And nickel acetate [ Ni (AC) 2 ·4H 2 O]Or copper acetate [ Cu (AC) 2 ·H 2 O]According to the mass ratio of 1:1, slowly adding the mixture into the prepared HBA-PVP-DMF slurry, and stirring for 10-12 h to obtain uniform precursor slurry;
step3: weaving the precursor slurry into a precursor network by utilizing an electrostatic spinning technology, and performing pyrolysis in a nitrogen atmosphere at 600-1000 ℃ to prepare the novel three-dimensional iron, nickel or copper nanoparticle coated and B and N co-doped multi-layer porous carbon nano sheets (FeNi@BNCNs or FeCu@BNCNs).
Further, the method comprises the following steps:
step1: according to the mass ratio of 3:1, weighing polyvinylpyrrolidone (PVP) powder and hydroxyphenylboric acid (HBA), dissolving the polyvinylpyrrolidone (PVP) powder and hydroxyphenylboric acid (HBA) into N, N-Dimethylformamide (DMF), and preparing HBA-PVP-DMF slurry by 30ml of DMF per gram of HBA;
step2: iron acetate [ Fe (AC) 2 ·4H 2 O]And nickel acetate [ Ni (AC) 2 ·4H 2 O]Or copper acetate [ Cu (AC) 2 ·H 2 O]According to the mass ratio of 1:1, slowly adding the mixture into the prepared HBA-PVP-DMF slurry, and stirring for 10 hours to obtain uniform precursor slurry;
step3: weaving the precursor slurry into a precursor network by utilizing an electrostatic spinning technology, and performing pyrolysis in a nitrogen atmosphere at 600-1000 ℃ to prepare the novel three-dimensional iron, nickel or copper nanoparticle coated and B and N co-doped multi-layer porous carbon nano sheets (FeNi@BNCNs or FeCu@BNCNs).
Further, in Step3, the temperature at which the preparation of FeNi@BNCNs is carried out under nitrogen atmosphere is 800 ℃; the temperature at which the preparation of FeCu@BNCNs was pyrolysed under a nitrogen atmosphere was 900 ℃.
The invention further aims at providing a use method of the catalyst for producing hydrogen by electrolyzing water through iron-nickel or iron-copper, which is characterized by comprising the following steps:
s1, mixing ultrapure water and Nafion solution (5%) according to the ratio of 9:1 to obtain a dispersion environment solution, mixing a sample and the dispersion according to the ratio of 3mg/ml to obtain a dispersion solution, ultrasonically dispersing the dispersion solution for 1h to obtain homogeneous catalyst ink, taking 30 mu L of the dispersion solution, dripping the 30 mu L of the dispersion solution on the surface of a glassy carbon electrode to prepare a working electrode, and naturally airing the working electrode for hydrogen evolution and hydrogen evolution reaction;
s2, hydrogen evolution reaction is carried out on N 2 Saturated 1.0mol/LKOH electrolyte, pH=14.
The beneficial effects of the invention are as follows:
(1) According to the invention, a large number of three-dimensional structures can be introduced through electrostatic spinning, so that the distribution quantity of mesoporous and carbon edge defect sites is increased;
(2) The unique three-dimensional porous structure of the invention improves the doping amount of B and N active sites;
(3) The electrolytic water electrolytic cell composed of the catalyst has high electrolytic water catalytic activity and excellent stability;
(4) The invention uses transition metal iron copper to reach the catalytic activity close to or even exceeding that of noble metal catalyst, thus saving the cost;
(5) The method can realize high-efficiency water electrolysis, and has the advantages of low economic cost, high efficiency, low energy consumption, strong operability and good feasibility.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of OER performance versus commercial catalyst performance for the product of example 1;
figure 2 is a graph of HER performance versus commercial catalyst performance for the example 1 product;
FIG. 3 is an X-ray diffraction pattern of the catalyst prepared in example 2;
FIG. 4 is a graph of the performance of FeNi@BNCCNs-800 two electrode electrolyzed water;
FIG. 5 is an electron microscope image of FeCu@BNCCNs-900 catalyst;
FIG. 6 is a polarization curve of LSV for the three electrode system illustrated in example 3;
FIG. 7 is a schematic diagram of a two-electrode cell of example 3.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The preparation method of the catalyst for producing hydrogen by electrolyzing water with iron and nickel comprises the following specific steps:
(1) 3g PVP powder and 1g HBA were dissolved in 30ml DMF to prepare HBA-PVP-DMF slurry;
(2) Will 1gFe (AC) 2 ·4H 2 O and 1gNi (AC) 2 ·H 2 Slowly adding O into the prepared HBA-PVP-DMF slurry, and stirring for 10 hours to obtain uniform precursor slurry;
(3) Weaving the precursor slurry into a precursor network by utilizing an electrostatic spinning technology, and respectively carrying out pyrolysis at 600 ℃, 700 ℃, 800 ℃, 900 ℃ and 1000 ℃ in nitrogen atmosphere to prepare the novel three-dimensional iron-nickel nanoparticle coated B-and N-co-doped multi-layer porous carbon nano sheets (FeNi@BNPCNS-600, feNi@BNPCNS-700, feNi@BNPCNS-800, feNi@BNPCNS-900 and FeNi@BNPCNS-1000).
Example 2
The preparation method of the catalyst for producing hydrogen by electrolyzing water with iron and copper comprises the following specific steps:
(1) 3g PVP powder and 1g HBA were dissolved in 30ml DMF to prepare HBA-PVP-DMF slurry;
(2) Will 1gFe (AC) 2 ·4H 2 O and 1gCu (AC) 2 ·H 2 Slowly adding O into the prepared HBA-PVP-DMF slurry, and stirring for 10 hours to obtain uniform precursor slurry;
(3) Weaving the precursor slurry into a precursor network by utilizing an electrostatic spinning technology, and respectively carrying out pyrolysis at 600 ℃, 700 ℃, 800 ℃, 900 ℃ and 1000 ℃ in nitrogen atmosphere to prepare the novel three-dimensional iron-nickel nanoparticle coated B-and N-co-doped multi-layer porous carbon nano sheets (FeCu@BNCNs-600, feCu@BNCNs-700, feCu@BNCNs-800, feCu@BNCNs-900 and FeCu@BNCNs-1000).
1. X-ray diffraction analysis
FIG. 3 is an X-ray diffraction pattern of a sample of the catalyst prepared in example 2 of the present invention. As can be seen from FIG. 3, the obtained catalytic material has both the characteristic diffraction peaks of amorphous carbon material and the characteristic diffraction peaks of copper and iron metals.
2. Electron microscope image analysis
FIG. 5 is an electron microscopic image of FeCu@BNCNs-900 catalyst prepared in example 2 of the present invention. From the microscopic morphological analysis, as can be seen in fig. 5, small molecule pyrolysis results in the conversion of two-dimensional carbon fibers into porous carbon nanoplatelets.
3. Performance analysis
FIG. 6 is a graph showing the electrochemical performance of a sample of the catalyst prepared in example 2 of the present invention. From FIG. 6, it can be seen that the electrochemical performance of the FeCu@BNPCNS-900 catalyst is optimal among the 5 catalysts prepared by the invention, and the catalyst is the optimal catalyst in the sample.
Example 3
Electrochemical performance under three electrode system
(1) A sample of the catalyst obtained in example 2 was taken: experiments were performed on FeCu@BNCCNs-600, feCu@BNCCNs-700, feCu@BNCCNs-800, feCu@BNCCNs-900, feCu@BNCCNs-1000, respectively.
(2) Mixing ultrapure water and Nafion solution (5%) according to the ratio of 9:1 to prepare a dispersion environment solution, mixing a sample and dispersion according to the ratio of 3mg/ml to obtain a dispersion solution, performing ultrasonic dispersion on the dispersion solution for 1h to obtain homogeneous catalyst ink, taking 30 mu L of the dispersion solution, dripping the 30 mu L of the dispersion solution on the surface of a glassy carbon electrode to prepare a working electrode, and naturally airing the working electrode for hydrogen evolution reaction.
(3) Hydrogen evolution reaction at N 2 Saturated 1.0mol/LKOH electrolyte, pH=14.
(4) When the current density reaches 10 mA.cm -2 When the catalyst is used, the initial potential and the overpotential of the FeCu@BNCCNS-900 catalyst are the minimum, namely 0.2mV and 0.33mV, and the initial point positions and the overpotential of the rest 4 catalysts are all larger than those of the FeCu@BNCCNS-900 catalyst.
Example 4
1. The three-dimensional ferric acetate-nickel acetate-hydroxyphenylboric acid-polyvinylpyrrolidone precursor network is prepared by adopting an electrostatic spinning method, micromolecular substances are pyrolyzed to cause two-dimensional carbon fibers to be converted into porous carbon nano sheets, and novel three-dimensional iron and nickel nanoparticle coated and B and N co-doped multilayer porous carbon nano sheets (FeNi@BNPCNS) are prepared by pyrolysis. After optimizing the pyrolysis temperature, various structural and morphological characterizations show that the optimized FeNi@BNPCNS-800 has larger surface area, abundant micropores/mesopores and a large number of carbon edge defects. Electrochemical tests show that FeNi@BNPCNs-800 shows optimal catalytic activity of Hydrogen Evolution Reaction (HER) and Oxygen Evolution Reaction (OER) in alkaline solution. For the total water separation,
the (-) FeNi@BNCCNS-800||FeNi@BNCCNS-800 (+) electrolytic cell has better catalytic effect. The synergistic effect, advanced charge transport capability and rich active centers of the three-dimensional layered porous structure are the reasons why FeNi@BNPCNs-800 have excellent water-splitting catalytic activity. In particular, since the three-dimensional layered porous FeNi@BNCNs-800 has remarkable structural and chemical stability, (-) FeNi@BNCNs-800||FeNi@BNCNs-800 (+) electrolytic cells exhibit excellent stability.
2. Preparing a three-dimensional ferric acetate-copper acetate-hydroxyphenylboric acid-polyvinylpyrrolidone precursor network by adopting an electrostatic spinning method, and converting the two-dimensional carbon fiber into a porous carbon nano sheet by pyrolysis to prepare the target catalyst. By physical and chemical characterization, the sample material at the pyrolysis temperature of 900 has larger surface area and is rich in carbon edge defects. Electrochemical tests show that FeCu@BNCNs-900 has optimal catalytic activity under alkaline solution conditions when participating in Hydrogen Evolution Reaction (HER) and Oxygen Evolution Reaction (OER). FeCu@BNCNs-900 has excellent water-splitting catalytic activity, which benefits from the multi-layer porous physical structure, excellent charge transport capacity and rich active sites. The three-dimensional porous layered structure of FeCu@BNCNs-900 enables the material to have obvious structural characteristics and stable chemical property, and shows excellent stability in a two-electrode electrolytic cell.
Claims (4)
1. The preparation method of the catalyst for producing hydrogen by electrolyzing water through iron nickel or iron copper is characterized by comprising the following steps:
step1: according to the mass ratio of 3-5: 1-2, weighing polyvinylpyrrolidone (PVP) powder and hydroxyphenylboric acid (HBA), dissolving the polyvinylpyrrolidone powder and the hydroxyphenylboric acid (HBA) into N, N-Dimethylformamide (DMF), and preparing HBA-PVP-DMF slurry by 30-50 ml of DMF per gram of HBA;
step2: iron acetate [ Fe (AC) 2 ·4H 2 O]And nickel acetate [ Ni (AC) 2 ·4H 2 O]Or copper acetate [ Cu (AC) 2 ·H 2 O]According to the mass ratio of 1:1, slowly adding the mixture into the prepared HBA-PVP-DMF slurry, and stirring for 10-12 h to obtain uniform precursor slurry;
step3: weaving the precursor slurry into a precursor network by utilizing an electrostatic spinning technology, and performing pyrolysis in a nitrogen atmosphere at 600-1000 ℃ to prepare the novel three-dimensional iron, nickel or copper nanoparticle coated and B and N co-doped multi-layer porous carbon nano sheets (FeNi@BNCNs or FeCu@BNCNs).
2. The method for preparing the catalyst for producing hydrogen by electrolyzing water through iron-nickel or iron-copper according to claim 1, which is characterized by comprising the following steps:
step1: according to the mass ratio of 3:1, weighing polyvinylpyrrolidone (PVP) powder and hydroxyphenylboric acid (HBA), dissolving the polyvinylpyrrolidone (PVP) powder and hydroxyphenylboric acid (HBA) into N, N-Dimethylformamide (DMF), and preparing HBA-PVP-DMF slurry by 30ml of DMF per gram of HBA;
step2: iron acetate [ Fe (AC) 2 ·4H 2 O]And nickel acetate [ Ni (AC) 2 ·4H 2 O]Or copper acetate [ Cu (AC) 2 ·H 2 O]According to the mass ratio of 1:1, slowly adding the mixture into the prepared HBA-PVP-DMF slurry, and stirring for 10 hours to obtain uniform precursor slurry;
step3: weaving the precursor slurry into a precursor network by utilizing an electrostatic spinning technology, and performing pyrolysis in a nitrogen atmosphere at 800-900 ℃ to prepare the novel three-dimensional iron, nickel or copper nanoparticle coated and B and N co-doped multi-layer porous carbon nano sheets (FeNi@BNPCNS or FeCu@BNPCNS).
3. The method for preparing the catalyst for producing hydrogen by electrolyzing water with iron-nickel or iron-copper according to claim 2, wherein in Step3, the temperature at which the preparation of FeNi@BNPCNs is pyrolyzed in a nitrogen atmosphere is 800 ℃; the temperature at which the preparation of FeCu@BNCNs was pyrolysed under a nitrogen atmosphere was 900 ℃.
4. The application method of the catalyst for producing hydrogen by electrolyzing water through iron nickel or iron copper is characterized by comprising the following steps:
s1, mixing ultrapure water and Nafion solution (5%) according to the proportion of 9:1 to obtain a dispersion environment solution, mixing a sample and the dispersion according to the proportion of 3mg/ml to obtain a dispersion solution, ultrasonically dispersing the dispersion solution for 1h to obtain homogeneous catalyst ink, taking 30 mu L of the dispersion solution, dripping the 30 mu L of the dispersion solution on the surface of a glassy carbon electrode to prepare a working electrode, and naturally airing the working electrode for hydrogen evolution reaction;
s2, hydrogen evolution reaction is carried out on N 2 Saturated 1.0mol/LKOH electrolyte, pH=14.
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Citations (9)
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