CN117661019A - Electrolytic water anode oxygen evolution catalyst Co 7 Fe 3 /Mo 2 C@C composite material and preparation method thereof - Google Patents
Electrolytic water anode oxygen evolution catalyst Co 7 Fe 3 /Mo 2 C@C composite material and preparation method thereof Download PDFInfo
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- CN117661019A CN117661019A CN202311657480.4A CN202311657480A CN117661019A CN 117661019 A CN117661019 A CN 117661019A CN 202311657480 A CN202311657480 A CN 202311657480A CN 117661019 A CN117661019 A CN 117661019A
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- 239000002131 composite material Substances 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000003054 catalyst Substances 0.000 title claims abstract description 31
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000001301 oxygen Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 239000001257 hydrogen Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 23
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 23
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 18
- 239000002904 solvent Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 238000001704 evaporation Methods 0.000 claims description 9
- 238000001354 calcination Methods 0.000 claims description 4
- 238000000935 solvent evaporation Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 16
- 229910045601 alloy Inorganic materials 0.000 abstract description 13
- 239000000956 alloy Substances 0.000 abstract description 13
- 230000003197 catalytic effect Effects 0.000 abstract description 13
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 238000011065 in-situ storage Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 80
- 238000001816 cooling Methods 0.000 description 7
- 238000000227 grinding Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 229910001313 Cobalt-iron alloy Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004502 linear sweep voltammetry Methods 0.000 description 2
- 238000005580 one pot reaction Methods 0.000 description 2
- 230000027756 respiratory electron transport chain Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000000441 X-ray spectroscopy Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000007809 chemical reaction catalyst Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012430 stability testing Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
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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 an electrolytic water anode oxygen evolution catalyst Co 7 Fe 3 /Mo 2 C@C composite material and its preparation method. The invention is prepared by using PVP, (NH) 4 ) 6 Mo 7 O 24 、Co(NO 3 ) 2 ·6H 2 O and Fe (NO) 3 ) 3 ·9H 2 O is used as raw material, and Co is synthesized by one-step in situ reaction 7 Fe 3 /Mo 2 C@C composite material using Mo 2 C to Co 7 Fe 3 The electronic structure of the alloy is regulated and controlled to reduce OER overpotential, thereby improving Co 7 Fe 3 Catalytic oxygen evolution performance of alloy catalysts, therefore Co 7 Fe 3 /Mo 2 C@C composite material can be used as high-efficiency anode oxygen-evolving catalyst in hydrogen production by water electrolysis. The preparation method of the invention realizes Co 7 Fe 3 /Mo 2 Carbon substrate, co in C@C composite 7 Fe 3 And Mo (Mo) 2 C in-situ generates the compound, realizes Mo while obtaining better conductive performance 2 C to Co 7 Fe 3 And the electronic structure and the catalytic performance of the alloy catalyst are effectively regulated.
Description
Technical Field
The invention belongs to the technical field of catalytic material synthesis, and in particular relates to an electrolytic water anode oxygen evolution catalyst Co 7 Fe 3 /Mo 2 C@C composite material and its preparation method.
Background
Electrolytic water hydrogen production is an important approach for green sustainable hydrogen production, including cathodic reduction Hydrogen Evolution (HER) and anodic oxidation Oxygen Evolution (OER) half reactions. In general, the high overpotential of HER and OER reactions results in high energy consumption and high cost of hydrogen production by electrolysis of water, which limits the wide application of the hydrogen production technology by electrolysis of water in industrial production. In contrast, OER reactions have slow kinetics due to their multi-electron reaction characteristics, with reaction overpotential significantly higher than that of cathodic HER reactions. Therefore, developing an OER reaction catalyst with low cost and high activity, and reducing OER overpotential are key to improving hydrogen production efficiency by water electrolysis and reducing hydrogen production energy consumption cost.
Currently, inexpensive and readily available cobalt-iron alloys exhibit higher catalytic activity in catalyzing OER reactions, but their catalytic performance is comparable to current commercial IrO 2 The catalyst still has a large gap; in view of this, the present invention synthesizes Co in one step by in situ reaction 7 Fe 3 Alloy, mo 2 C and C composite material, mo is used 2 C to Co 7 Fe 3 The electronic structure of the alloy is regulated and controlled, thereby improving Co 7 Fe 3 The catalytic activity of the alloy reduces the overpotential of OER, improves the technical effect of oxygen evolution performance of the cobalt-iron alloy catalyst, provides a new thought for improving the hydrogen production efficiency of water electrolysis by the OER cobalt-iron alloy catalyst, and has important significance for reducing the hydrogen production cost of water electrolysis and promoting the wide application of the catalyst.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides an electrolytic water anode oxygen evolution catalyst Co 7 Fe 3 /Mo 2 C@C composite material and its preparation method.
The first aspect of the invention provides an electrolyzed water anode oxygen evolution catalyst Co 7 Fe 3 /Mo 2 A method of preparing C@C composite comprising the steps of:
s1, polyvinylpyrrolidone (PVP) and (NH) 4 ) 6 Mo 7 O 24 、Co(NO 3 ) 2 ·6H 2 O and Fe (NO) 3 ) 3 ·9H 2 O is dissolved by deionized water, stirred uniformly, and the mixture is dried and ground after solvent evaporation;
s2, placing the ground mixture into a tube furnace, and adding the mixture into N 2 High temperature reaction is carried out under atmosphere to obtain Co 7 Fe 3 /Mo 2 C@C composite.
Preferably, in step S1, the polyvinylpyrrolidone (PVP), (NH) 4 ) 6 Mo 7 O 24 、Co(NO 3 ) 2 ·6H 2 O and Fe (NO) 3 ) 3 ·9H 2 The mass ratio of O is 5:0.2 to 1:0.4 to 5:0.6 to 2.
Preferably, in step S1, the stirring is performed at room temperature for 2 to 5 hours.
Preferably, in step S1, the evaporating solvent temperature is 75 to 95 ℃.
Preferably, in step S1, the drying temperature is 80 to 95 ℃.
Preferably, in the step S2, the heating rate is 8-10 ℃/min, the calcining temperature is 600-900 ℃, and the calcining time is 2-4 h.
The second aspect of the invention provides an electrolyzed water anode oxygen evolution catalyst Co prepared by the preparation method 7 Fe 3 /Mo 2 C@C composite.
In a third aspect, the invention provides the electrolyzed water anode oxygen evolution catalyst Co 7 Fe 3 /Mo 2 Application of C@C composite material in hydrogen production by water electrolysis.
The invention has the following beneficial effects:
(1) The inventionBy using polyvinylpyrrolidone (PVP), (NH) 4 ) 6 Mo 7 O 24 、Co(NO 3 ) 2 ·6H 2 O and Fe (NO) 3 ) 3 ·9H 2 O is used as raw material, deionized water is used as solvent, and Co is prepared through high-temperature one-step reaction 7 Fe 3 /Mo 2 C@C composite. The invention synthesizes Co in one step through in-situ reaction 7 Fe 3 Alloy, mo 2 C and C composite material, mo is used 2 C to Co 7 Fe 3 The electronic structure of the alloy is regulated and controlled to reduce OER overpotential, thereby improving Co 7 Fe 3 Catalytic oxygen evolution performance of alloy catalysis, therefore Co 7 Fe 3 /Mo 2 C@C composite material can be used as high-efficiency anode oxygen-evolving catalyst in hydrogen production by water electrolysis.
(2) The preparation method of the invention realizes Co 7 Fe 3 /Mo 2 Carbon substrate, co in C@C composite 7 Fe 3 And Mo (Mo) 2 C in-situ generates the compound, realizes Mo while obtaining better conductive performance 2 C to Co 7 Fe 3 And the electronic structure and the catalytic performance of the alloy catalyst are effectively regulated. The preparation method has simple process, and can prepare the efficient Co by only one-step reaction 7 Fe 3 /Mo 2 C@C oxygen evolution catalyst material can save cost and is beneficial to popularization and use.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is Co prepared in example 1 7 Fe 3 /Mo 2 C@C XRD spectrum of the composite;
FIG. 2 is Co prepared in example 1 7 Fe 3 /Mo 2 An EDX profile of C@C composite;
FIG. 3 is Co prepared in example 1 and comparative examples 1-2 7 Fe 3 /Mo 2 C@C composite material, co 7 Fe 3 @C and Mo 2 C@C Linear Sweep Voltammetry (LSV) plot;
FIG. 4 is Co prepared in example 1 7 Fe 3 /Mo 2 Graph of the stability (IT) results of C@C composite in 1M KOH electrolyte;
FIG. 5 is Co prepared in example 1 7 Fe 3 /Mo 2 An XPS (x-ray Spectroscopy) fine spectrogram of the C@C composite material;
FIG. 6 is Co 7 Fe 3 /Mo 2 C@C composite and Co 7 Fe 3 Schematic of the reaction energy barrier for each step during the @ C kinetic reaction.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. The present invention will be described in detail with reference to examples.
Example 1
(1) Accurately weighing 20mL of deionized water, placing the beaker on a magnetic stirrer, and sequentially adding 0.5g of polyvinylpyrrolidone (PVP) and 0.0265g (NH) 4 ) 6 Mo 7 O 24 、0.1019g Co(NO 3 ) 2 ·6H 2 O and 0.0606g Fe (NO) 3 ) 3 ·9H 2 O, stirring at room temperature for 3h, stirring at 80 ℃ in a water bath to evaporate the solvent, evaporating the solvent, and transferring the mixture into an oven to dry at 90 ℃ overnight;
(2) Drying, grinding, transferring into tube furnace, and adding N 2 Heating to 800 ℃ at a heating rate of 10 ℃/min under the atmosphere, preserving heat for 2 hours, and naturally cooling to room temperature to obtain Co 7 Fe 3 /Mo 2 C@C composite.
Example 2
(1) Accurate and accurate20mL of deionized water was measured and placed in a beaker, and the beaker was placed on a magnetic stirrer, and 0.5g of polyvinylpyrrolidone (PVP) and 0.0353g (NH) were sequentially added while stirring 4 ) 6 Mo 7 O 24 、0.1019g Co(NO 3 ) 2 ·6H 2 O and 0.0606g Fe (NO) 3 ) 3 ·9H 2 O, stirring at room temperature for 3h, stirring at 80 ℃ in a water bath to evaporate the solvent, evaporating the solvent, and transferring the mixture into an oven to dry at 90 ℃ overnight;
(2) Drying, grinding, transferring into tube furnace, and adding N 2 And (3) heating to 800 ℃ at a heating rate of 10 ℃/min under the atmosphere, preserving heat for 2 hours, and naturally cooling to room temperature to obtain the catalyst composite material.
Example 3
(1) Accurately weighing 20mL of deionized water, placing the beaker on a magnetic stirrer, and sequentially adding 0.5g of polyvinylpyrrolidone (PVP) and 0.0265g (NH) 4 ) 6 Mo 7 O 24 、0.0437g Co(NO 3 ) 2 ·6H 2 O and 0.0606g Fe (NO) 3 ) 3 ·9H 2 O, stirring at room temperature for 3h, stirring at 80 ℃ in water bath to evaporate the solvent, evaporating the solvent, and transferring the mixture into an oven to dry at 95 ℃ overnight;
(2) Drying, grinding, transferring into tube furnace, and adding N 2 And (3) heating to 800 ℃ at a heating rate of 8 ℃/min under the atmosphere, preserving heat for 2 hours, and naturally cooling to room temperature to obtain the catalyst composite material.
Example 4
(1) Accurately weighing 20mL of deionized water, placing the beaker on a magnetic stirrer, and sequentially adding 0.5g of polyvinylpyrrolidone (PVP) and 0.0265g (NH) 4 ) 6 Mo 7 O 24 、0.2038g Co(NO 3 ) 2 ·6H 2 O and 0.0606g Fe (NO) 3 ) 3 ·9H 2 O, stirring at room temperature for 3h, then stirring at 75 ℃ in water bath to evaporate the solvent, evaporating the solvent, and then transferring the mixture into an oven to dry at 95 ℃ overnight;
(2) Drying, grinding, transferring into tube furnace, and adding N 2 And (3) heating to 600 ℃ at a heating rate of 10 ℃/min under the atmosphere, preserving heat for 4 hours, and naturally cooling to room temperature to obtain the catalyst composite material.
Example 5
(1) Accurately weighing 20mL of deionized water, placing the beaker on a magnetic stirrer, and sequentially adding 0.5g of polyvinylpyrrolidone (PVP) and 0.0265g (NH) 4 ) 6 Mo 7 O 24 、0.1019g Co(NO 3 ) 2 ·6H 2 O and 0.1414g Fe (NO) 3 ) 3 ·9H 2 O, stirring at room temperature for 5h, stirring at 95 ℃ in water bath to evaporate the solvent, evaporating the solvent, and transferring the mixture into an oven to dry at 90 ℃ overnight;
(2) Drying, grinding, transferring into tube furnace, and adding N 2 And (3) heating to 900 ℃ at a heating rate of 10 ℃/min under the atmosphere, preserving heat for 2 hours, and naturally cooling to room temperature to obtain the catalyst composite material.
Comparative example 1
(1) Accurately weighing 20mL of deionized water, placing the beaker on a magnetic stirrer, and sequentially adding 0.5g of polyvinylpyrrolidone (PVP) and 0g (NH) 4 ) 6 Mo 7 O 24 、0.1019g Co(NO 3 ) 2 ·6H 2 O and 0.0606g Fe (NO) 3 ) 3 ·9H 2 O, stirring at room temperature for 3h, stirring at 80 ℃ in a water bath to evaporate the solvent, evaporating the solvent, and transferring the mixture into an oven to dry at 90 ℃ overnight;
(2) Drying, grinding, transferring into tube furnace, and adding N 2 Heating to 800 ℃ at a heating rate of 10 ℃/min under the atmosphere, preserving heat for 2 hours, and naturally cooling to room temperature to obtain Co 7 Fe 3 Material @ C.
Comparative example 2
(1) Accurately weighing 20mL of deionized water, placing the beaker on a magnetic stirrer, and sequentially adding 0.5g of polyvinylpyrrolidone (PVP) and 0.0265g (NH) 4 ) 6 Mo 7 O 24 、0g Co(NO 3 ) 2 ·6H 2 O and 0g Fe (NO) 3 ) 3 ·9H 2 O, stirring at room temperature for 3h, stirring at 80 ℃ in a water bath to evaporate the solvent, evaporating the solvent, and transferring the mixture into an oven to dry at 90 ℃ overnight;
(2) Drying, grinding, transferring into tube furnace, and adding N 2 Heating to 800 ℃ at a heating rate of 10 ℃/min under the atmosphere, preserving heat for 2 hours, and naturally cooling to room temperature to obtain Mo 2 C@C material.
(a) For Co prepared in example 1 7 Fe 3 /Mo 2 C@C composite materials were characterized and XRD and EDX results are shown in figures 1 and 2.
As can be seen from the results of FIG. 1, co prepared in example 1 7 Fe 3 /Mo 2 C@C the composite material contains Co 7 Fe 3 Alloy, mo 2 C and C.
As can be seen from the results of fig. 2, the material prepared in example 1 contains Co, fe, mo, C and O elements; the XRD and EDX characterization results can obtain that the invention successfully prepares Co 7 Fe 3 /Mo 2 C@C composite.
(b) Co prepared in example 1 7 Fe 3 /Mo 2 C@C composite materials were tested for electrocatalytic activity and the results are shown in figure 3.
Co was tested by Linear Sweep Voltammetry (LSV) 7 Fe 3 /Mo 2 C@C、Mo 2 C@C and Co 7 Fe 3 Electrocatalytic OER activity of @ C catalyst material in 1.0M KOH electrolyte. Three catalyst materials Co 7 Fe 3 /Mo 2 C@C、Co 7 Fe 3 @C and Mo 2 C@C at 10mA/cm 2 The overpotential at current density was 254mV, 308mV and 439mV, respectively. Co (Co) 7 Fe 3 /Mo 2 C@C composite at 10mA/cm 2 Overpotential ratio Mo at current density 2 C@C 185mV lower than Co 7 Fe 3 @ C was 54mV lower. The results show that Mo 2 The introduction of C can effectively improve Co 7 Fe 3 OER catalytic performance of the alloy.
(c) Co prepared in example 1 7 Fe 3 /Mo 2 C@C composite materials were subjected to catalytic stability testing and the results are shown in figure 4.
FIG. 4 shows that the current density does not significantly decrease over a long period of time (20 h) in the catalytic experiment, co prepared in example 1 7 Fe 3 /Mo 2 C@C the composite exhibits excellent catalytic stability.
(d) Co prepared in example 1 7 Fe 3 /Mo 2 XPS (XPS) fine spectrum test of C@C composite material, the result is shown in figure 5, and Co is added 7 Fe 3 /Mo 2 C@C composite and Co 7 Fe 3 The kinetic energy barrier test was performed at @ C, and the results are shown in FIG. 6.
As can be seen from the XPS results of FIGS. 5 (a) - (d), co 7 Fe 3 /Mo 2 C@C and Co 7 Fe 3 In @ C Co is present in Co 3+ And Co 2+ Fe also exists in Fe in two valence states 2+ And Fe (Fe) 3+ Two valence states; comparative Co 7 Fe 3 /Mo 2 C@C and Co 7 Fe 3 Co and Fe in @ C can be found when in Co 7 Fe 3 Mo incorporation in @ C 2 After C, co 7 Fe 3 /Mo 2 The electronic structure of Co and Fe in C@C is compared to Co 7 Fe 3 Obvious forward movement of @ C occurs; re-contrast Co 7 Fe 3 /Mo 2 C@C and Mo 2 C@C found that Mo 2 C is introduced into Co 7 Fe 3 After @ C, the Mo electron structure is significantly negative, indicating that in Co 7 Fe 3 /Mo 2 C@C the electron transfer to Mo is demonstrated by the presence of Co and Fe in Mo 2 C to Co 7 Fe 3 The electronic structure of the alloy is effectively regulated, and the effective regulation is beneficial to improving the catalytic performance of the OER reaction of the cobalt-iron alloy.
As can be seen from the results of FIG. 6, co 7 Fe 3 Comparative @ C Co 7 Fe 3 /Mo 2 The C@C composite material effectively reduces the reaction energy barrier of reaction kinetics when catalyzing OER reaction. Wherein Co is 7 Fe 3 Speed of determination at @ CThe method comprises the following steps: * O (O) 2 +H 2 O+4e - →O 2 +2H 2 O+4e - The calculated free energy of this step is 3.40eV, whereas Co 7 Fe 3 /Mo 2 The speed-determining step of C@C is as follows: * O+2OH - +H 2 O+2e - →*OOH+OH - +H 2 O+3e - The calculated free energy of this step was 2.43eV, which is evident from Co 7 Fe 3 /Mo 2 The free energy of calculation (2.43 eV) of the mass step of C@C is significantly lower than Co 7 Fe 3 The free energy of calculation of the step of the block speed at @ C (3.40 eV). This indicates Mo 2 The introduction of C can effectively regulate and control the electronic structure of the cobalt-iron alloy, and simultaneously can accelerate the electron transfer in the reaction process, reduce the reaction energy barrier of the kinetic reaction, and further achieve the technical effect of reducing the overpotential of the OER reaction.
The present invention is not limited to the above-described specific embodiments, and various modifications may be made by those skilled in the art without inventive effort from the above-described concepts, and are within the scope of the present invention.
Claims (7)
1. Electrolytic water anode oxygen evolution catalyst Co 7 Fe 3 /Mo 2 The preparation method of the C@C composite material mainly comprises the following steps:
s1, polyvinylpyrrolidone (PVP) and (NH) 4 ) 6 Mo 7 O 24 、Co(NO 3 ) 2 ·6H 2 O and Fe (NO) 3 ) 3 ·9H 2 O is dissolved by deionized water, stirred uniformly, and the mixture is dried and ground after solvent evaporation;
s2, placing the ground mixture into a tube furnace, and adding the mixture into N 2 High temperature reaction is carried out under atmosphere to obtain Co 7 Fe 3 /Mo 2 C@C composite.
2. The electrolyzed water anode oxygen evolution catalyst Co according to claim 1 7 Fe 3 /Mo 2 The preparation method of the C@C composite material is characterized in that in the step S1, polyvinylpyrrolidone, (NH) 4 ) 6 Mo 7 O 24 、Co(NO 3 ) 2 ·6H 2 O and Fe (NO) 3 ) 3 ·9H 2 The mass ratio of O is 5:0.2 to 1:0.4 to 5:0.6 to 2.
3. The electrolyzed water anode oxygen evolution catalyst Co according to claim 1 7 Fe 3 /Mo 2 The preparation method of the C@C composite material is characterized in that in the step S1, the stirring is performed at room temperature, and the stirring time is 2-5 h.
4. The electrolyzed water anode oxygen evolution catalyst Co according to claim 1 7 Fe 3 /Mo 2 The preparation method of the C@C composite material is characterized in that in the step S1, the temperature of the evaporating solvent is 75-95 ℃; the drying temperature is 80-95 ℃.
5. Electrolytic water anode oxygen evolution catalyst Co according to claim 2 7 Fe 3 /Mo 2 C@C, wherein in step S2, the heating rate is 8-10 ℃/min, the calcining temperature is 600-900 ℃, and the calcining time is 2-4 h.
6. An electrolyzed water anode oxygen evolution catalyst Co prepared by the preparation method according to any one of claims 1-5 7 Fe 3 /Mo 2 C@C composite.
7. The electrolytic water anode oxygen evolution catalyst Co according to claim 6 7 Fe 3 /Mo 2 Application of C@C composite material in hydrogen production by water electrolysis.
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