CN110683588A - Self-supporting CoMoS4Super capacitor electrode material, preparation method and application - Google Patents
Self-supporting CoMoS4Super capacitor electrode material, preparation method and application Download PDFInfo
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
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Abstract
The invention discloses a self-supporting CoMoS4Supercapacitor electrode material, preparation method and application thereof, and self-supporting Co (OH) obtained by electrodeposition method2An electrode precursor; heating ammonium paramolybdate and ammonia water to react to generate ammonium molybdate, and adding (NH)4)2S reacts with ammonium molybdate to form (NH)4)2MoS4(ii) a Will be (NH)4)2MoS4The precipitate is uniformly dispersed in water, then the electrode precursor is put into the solution for hydrothermal reaction, and self-supporting CoMoS is obtained after post-treatment4And (3) a supercapacitor electrode material. The invention can save the cost of the adhesive and the conductive agent in the electrode preparation process, and simultaneously improve the proportion of the active substance components of the pole piece, thereby improving the specific capacitance of unit area. The electrode material has huge specific surface area and abundant micropores, and can effectively contact with electrolyte to obtain the electrode material with high stability.
Description
Technical Field
The invention belongs to the technical field of electrochemistry, particularly relates to the technical field of super capacitor anode materials, and particularly relates to a CoMoS4The nanosheet is used as an electrode material of a super capacitor, and a preparation method and application thereof.
Background
The pseudocapacitance type super capacitor has the obvious advantages of high power density, quick charge and discharge performance, ultra-long cycle life and the like, and has wide application in wide application of portable electronic equipment, electric vehicles/hybrid electric vehicles and the like. The asymmetric super capacitor has a positive pushing effect on the requirement of increasing the energy density and the power density of the energy storage device, and generally comprises a battery type (pseudo-capacitor) electrode and a capacitor type electrode. The capacitance type electrode is generally made of stable activated carbon materials, the pseudo-capacitance electrode is generally made of oxides, sulfides or conductive polymers and the like with electrochemical activity, wherein transition metal sulfides are the current research hotspots, have higher conductivity and higher specific capacitance than the same type of oxide materials, and have the advantages of rich resources and low cost compared with noble metal oxides, and have the advantages of simple synthesis, low toxicity in the synthesis process and the like compared with the conductive polymers.
The current methods for preparing transition metal sulfides can be classified into hydrothermal methods, solvothermal methods, electrodeposition methods, and the like. Hydrothermal method and solvothermal method are widely used material preparation methods at present, and crystal nucleation and growth are realized in high-temperature and high-pressure environment. However, both of the above methods have the disadvantages of low yield, unknown pressure of atmosphere in the reactor during the reaction process, and the like, and cannot be accurately controlled, which results in serious waste of raw materials. In addition, the solvothermal method uses organic matters as a reaction solvent, so toxic and harmful substances are easily generated in the material preparation process, and the treatment of residual liquid after the reaction is more difficult than that of a hydrothermal reaction system. In addition, in terms of the construction of the electrode, the specific capacitance per unit mass/area of the supercapacitor decreases due to the presence of a conductive agent, a binder, and the like used in the preparation process in the working electrode process, and problems such as particle scattering of the electrode material may also occur during long cycles.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the disadvantages and drawbacks mentioned in the background art and to provide a self-supporting CoMoS4The super capacitor electrode material, the preparation method and the application thereof are used for improving the utilization efficiency of raw materials and improving the capacitance performance and stability.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
self-supporting CoMoS4The preparation method of the electrode material of the super capacitor comprises the following steps:
(1) deposition of Co (OH) on Current collectors by electrodeposition2Obtaining self-supporting Co (OH)2Electrode precursors, or preparation of self-supporting Co (CO) by hydrothermal method3)0.5An OH electrode precursor;
(2) heating ammonium paramolybdate and ammonia water to react to generate ammonium molybdate, and adding (NH)4)2S reacts with ammonium molybdate to form (NH)4)2MoS4Cooling, crystallizing and aging to obtain (NH)4)2MoS4Precipitating;
(3) the (NH) obtained in the step (2)4)2MoS4The precipitate is dispersed in waterHomogenizing, then putting the electrode precursor in the step (1) for hydrothermal reaction, and obtaining self-supporting CoMoS through post-treatment4And (3) a supercapacitor electrode material.
Further, the self-supporting electrode substrate subjected to electrodeposition in the step (1) adopts cleaned foamed nickel, carbon felt, carbon fiber paper, conductive glass or conductive carbon cloth.
Further, the electrodeposition in the step (1) adopts a three-electrode system, the counter electrode and the reference electrode are respectively a platinum sheet electrode and a silver chloride electrode, and the electrodeposition solution Co2+Has a concentration of 0.002mol L-1～0.5mol L-1。
Further, the electrodeposition in the step (1) adopts constant potential deposition or constant current deposition, wherein the deposition potential is-0.3-1.5V vs Ag/AgCl, the deposition current is 1-2000 mA, the deposition temperature is 20-90 ℃, and the pH value is controlled at 2.0-10.0.
Further, the molar ratio of ammonium paramolybdate to aqueous ammonia in the step (2) is 1 (Mo)7O24 6+):6(NH3)～1(Mo7O24 6 +):12(NH3)。
Further, step (3) (NH)4)2MoS4Has a concentration of 0.05mol L-1～8mol L-1。
Further, the temperature of the hydrothermal reaction in the step (3) is 70-200 ℃, and the reaction time is 2-12 h.
The invention provides a self-supporting CoMoS4The supercapacitor electrode material is prepared by the preparation method.
The invention also provides the self-supporting CoMoS4The application of the electrode material of the super capacitor in the super capacitor.
Compared with the prior art, the invention has the advantages that:
(1) the electrodeposition method can accurately control parameters such as voltage, current, temperature and the like in the deposition process, and effectively reduces the uncontrollable property of the material synthesis process. The electrodeposition process improves the utilization efficiency of raw materials.
(2) The binderless electrode is prepared by an electrodeposition method, so that the cost of a binder and a conductive agent in the electrode preparation process can be saved, the proportion of active substance components of the electrode sheet is improved, the operation error in the electrode preparation process and the gram capacity loss caused by the binder and the like can be effectively reduced, the specific capacitance of a unit area is improved, and the binderless self-supporting electrode is favorable for improving the capacitance performance and stability of an electrode material.
(3) The micro-morphology of the precursor material is not damaged in the hydrothermal vulcanization reaction process, the electrode material obtained by the method inherits the nano-sheet structure of the self-supporting precursor on the microstructure, has a uniform nano-sheet structure, has a huge specific surface area and abundant micropores, can effectively contact with an electrolyte, obtains a high-stability electrode material, and has stable rate performance and stability under large current.
Therefore, the preparation method of the composite material provided by the invention develops a new idea for the development of the electrode material of the super capacitor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows deposition prepared Co (OH) in example 1 of the present invention2SEM image of (d).
FIG. 2 is a CoMoS prepared in example 1 of the invention4SEM image of (d).
FIG. 3 is a CoMoS prepared in example 1 of the invention4EDS elemental analysis map of (a).
FIG. 4 is a CoMoS prepared in example 1 of the invention4The element plane distribution scan results.
FIG. 5 is a CoMoS prepared in example 1 of the invention4Rate performance tested under three-electrode systemAnd (6) obtaining the result.
FIG. 6 is a CoMoS prepared in example 1 of the invention4Rate performance results tested in asymmetric supercapacitors.
FIG. 7 is a CoMoS prepared in example 1 of the invention4Cycle performance results tested in asymmetric supercapacitors.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Self-supporting CoMoS of one embodiment of the invention4The preparation method of the electrode material of the super capacitor comprises the following steps:
(1) preparing Co with a certain concentration2+Solution, self-supporting Co (OH) prepared by electrodeposition in a three-electrode system2The electrode is used as a precursor, and self-supporting Co (CO) can also be prepared by a hydrothermal method3)0.5OH electrode as precursor.
The self-supporting electrode matrix in the electrodeposition process can adopt cleaned foamed nickel, carbon felt, carbon fiber paper, conductive glass or conductive carbon cloth, and sodium hydroxide, absolute ethyl alcohol and deionized water are sequentially used for ultrasonic cleaning for multiple times in the cleaning process so as to remove oil stains and attachments on the surface of the conductive collector.
Preferably, the counter electrode and the reference electrode for electrodeposition are a platinum sheet electrode and a silver chloride electrode respectively, and the concentration of the electrodeposition solution is 0.002mol L-1～0.5mol L-1Co2+The Co source may beCobalt chloride, cobalt nitrate, cobalt carbonate, cobalt sulfate, cobalt oxalate, and the like.
The electrodeposition method can adopt constant potential deposition or constant current deposition, wherein the deposition potential is-0.3-1.5 Vvs. Ag/AgCl, the deposition current is 1-2000 mA, the deposition temperature is 20-90 ℃, and the pH value is controlled to be 2.0-10.0.
Hydrothermal method for preparing Co (CO)3)0.5OH: weighing a certain mass of Co salt (cobalt nitrate, cobalt chloride, cobalt sulfate and cobalt oxalate) and urea (the mass ratio of the Co salt to the urea is 1: 3-7: 9), uniformly mixing the Co salt and the urea in 100mL of deionized water, then transferring the mixture into a 200mL polytetrafluoroethylene reaction kettle, and carrying out hydrothermal reaction at a certain temperature to synthesize a precursor. The temperature of the hydrothermal reaction is 80-130 ℃, and the reaction time is 9-15 h. The hydrothermal method for preparing the electrode is to directly put a current collector such as foamed nickel/carbon fiber paper and the like into a hydrothermal kettle, and a precursor can be directly grown on the current collector to be used as a precursor of the self-supporting electrode.
(2) Heating ammonium paramolybdate and ammonia water in water bath to react to generate ammonium molybdate, and adding (NH)4)2S solution reacts with it to form (NH)4)2MoS4The reaction principle of the synthesis process is as follows:
(NH4)6Mo7O24+8NH3·H2O→7(NH4)2MoO4+4H2O
(NH4)2MoO4+4(NH4)2S→(NH4)2MoS4+4NH3·H2O
taking out the reactor after the water bath heating reaction is finished, naturally cooling to room temperature, and stirring for a period of time to crystallize and age the material to obtain (NH)4)2MoS4Precipitating, and freeze-drying at low temperature by freeze-drying method.
Preferably, the molar ratio of ammonium paramolybdate to aqueous ammonia is 1 (Mo)7O24 6+):6(NH3)～1(Mo7O24 6+):12(NH3)，(NH4)6Mo7O24Has a concentration of 0.03mol L-1～0.20mol L-1，(NH4)2The concentration of S ranges from 3 wt% (S) to 10 wt% (S) (note: in terms of S element mass ratio). The reaction temperature is 60-180 ℃, and the reaction time of the second step is 2-12 h.
(3) Subjecting the (NH) obtained in the step (2)4)2MoS4Adding a precipitant into deionized water while stirring, dispersing for 30min, transferring into a reaction kettle, placing the self-supporting precursor obtained in the step (1) into the reaction kettle, carrying out hydrothermal reaction at a higher temperature, carrying out suction filtration and washing on the obtained material by using the deionized water, and drying in a 60 ℃ oven to obtain a product, namely the self-supporting CoMoS4A supercapacitor electrode. The reactions that occur during the hydrothermal process are:
Co(OH)2+(NH4)2MoS4→CoMoS4+2NH3H2O
in the step (3), (NH)4)2MoS4The concentration of the precipitant was 0.05mol L-1～8mol L-1The temperature of the hydrothermal reaction is 70-200 ℃, and the reaction time is 2-12 h.
The electrode prepared by the invention is a self-supporting electrode, and the microstructure of the electrode inherits the nanostructure morphology of the precursor. The self-supporting electrode is an electrode which does not need a binder or a conductive agent and can be directly used for electrochemical performance test.
Example 1:
self-supporting CoMoS4The preparation method of the electrode material of the super capacitor comprises the following specific preparation processes:
(1) cutting carbon fiber paper into 2cm by 4cm, and adding 1mol L-1Ultrasonically cleaning the material with sodium hydroxide solution for 30min to remove stains and impurities on the surface of the material, then ultrasonically washing the material with deionized water and absolute ethyl alcohol in sequence, and drying the material in an oven at 60 ℃ for 4h for later use.
(2) 2.4278g CoCl were weighed out2·6H2Dissolving O in 50mL deionized water, stirring for 30min to obtain pink transparent solution as electrodeposition solution for electrodeposition reaction, and transferring the electrodeposition solution into a 100mL electrolytic bath.
(3) And (2) carrying out electrodeposition by using the carbon fiber electrode prepared in the step (1) as a working electrode, Ag/AgCl as a reference electrode and a Pt sheet as a counter electrode in a three-electrode system by using a constant potential step method. The deposition potential is-0.9V and the deposition time is 1 h. And after deposition, taking down the carbon fiber paper, sequentially and alternately cleaning the carbon fiber paper by using deionized water and absolute ethyl alcohol for three times, and then drying the carbon fiber paper in a 40 ℃ drying oven for 6 hours to obtain a self-supporting precursor.
(4) 12.5g (NH) are weighed4)6Mo7O24·4H2O (ammonium paramolybdate) was dissolved in 35mL of deionized water, and 15mL of NH was added to the solution while stirring in a 70 ℃ water bath3·H2O (concentration: 25 wt%), dissolved completely and mixed well, then 110mL (NH) was added to the solution4)2S (ammonium sulfide) (8 wt% S) solution. Reacting in a water bath kettle at 70 ℃ for 2h, taking out the beaker, naturally cooling to room temperature, and aging and crystallizing for 12 h.
(5) The aged crystal is sequentially and alternately filtered and washed by deionized water and absolute ethyl alcohol, and is dried in an oven at 80 ℃ for 12 hours to obtain (NH)4)2MoS4A precipitating agent.
(6) The above (NH)4)2MoS4Adding a precipitator into deionized water while stirring, dispersing for 30min uniformly, transferring into a 100mL polytetrafluoroethylene reaction kettle, putting the self-supporting precursor obtained in the step (3) into the reaction kettle, preserving heat for 2h at 80 ℃, performing suction filtration and washing on the obtained material by using deionized water, and drying in a 60 ℃ oven to obtain a product, namely the self-supporting CoMoS4A supercapacitor electrode.
FIG. 1 is an SEM image of the precursor prepared in step (3) of this example, and it can be seen that Co (OH) is obtained by electrodeposition2The precursor is a porous structure consisting of a large number of nano sheets, the self-supporting structure is favorable for eliminating the use of a binder in the subsequent preparation process of the pole piece, and meanwhile, the self-supporting electrode obtained by performing electrodeposition on carbon fiber paper with good conductivity has good conductivity, so that the influence of a conductive agent on the conductivity of the working electrode is reduced. FIG. 2 shows the self-supporting CoMoS obtained in this example4SEM image of supercapacitor electrode, it can be seen that the electrode material inheritsThe shape of the precursor has rich pore structures, which is beneficial to the contact of electrolyte and active substances in the electrode reaction process and reduces the liquid electrical resistance. FIG. 3 shows the self-supporting CoMoS obtained in this example4EDS element analysis results of the material show that C, S, Co and Mo elements all show obvious spectral peaks, and the chemical reaction in the hydrothermal process can be determined to be uniformly carried out on the surface of the material by combining an element surface distribution image in a figure 4. Evaluation of CoMoS by electrochemical Performance testing4The application performance of the material in the super capacitor. The rate capability test was first performed in a three-electrode system, as shown in FIG. 5, with the current from 1Ag-1Gradually increased to 20Ag-1Specific capacitance of the supercapacitor is 565.6F g-1Reduced to 396F g-1The capacity retention rate is 70%, which shows that the material has obvious application potential in a super capacitor. In addition, the composite material prepared by the method provided by the invention is used as an active substance as a positive electrode, a commercialized activated carbon material is used as a negative electrode, and the electrochemical performance is tested in an asymmetric supercapacitor system. FIG. 6 is a CoMoS4V/rate capability of AC asymmetric super capacitor, when current degree is 1Ag-1Of (i) CoMoS4The specific capacitance of// AC is 120.31F g-1When the current density was increased to 20Ag-1The specific capacitance of the supercapacitor is 85F g-1Stable rate capability is shown. FIG. 7 is a CoMoS4// AC asymmetric supercapacitor at 1Ag-1The capacity retention rate after 10000 cycles is 84%, which shows that the super capacitor has stability under large current.
Example 2:
(1) cutting the foamed nickel into 1 × 2cm, placing the foamed nickel into a 2M HCl solution, carrying out ultrasonic washing for 10min, removing a NiO layer on the surface of the foamed nickel, then washing the foamed nickel for multiple times by using deionized water and absolute ethyl alcohol, and then placing the foamed nickel in a vacuum drying box at 60 ℃ for vacuum drying for 3h for later use.
(2) Adding 5mmol of Co (NO)3)2·6H2Dissolving O in 100mL deionized water to prepare Co-containing solution2+Stirring the metal salt mixed solution untilAnd completely dissolving. And adjusting the pH of the mixed solution to about 7 by using ammonia water to serve as an electrodeposition electrolyte for later use.
(3) And (2) taking the foamed nickel prepared in the step (1) as a working electrode, and respectively taking Ag/AgCl and Pt as a reference electrode and a counter electrode, and carrying out electrodeposition by adopting a constant current deposition method. Wherein the salt solution prepared in the step (2) is used as electrolyte and is added at 20mA cm-1At a current density of (2), in a water bath at 60 ℃ for 30 min. Finally, the mixture is cleaned by deionized water and absolute ethyl alcohol and dried at the temperature of 60 ℃ to obtain Co (OH)2A precursor material.
(4) Weighing 7.5g of ammonium paramolybdate, dissolving in 20mL of deionized water, stirring and adding 10mL of 25% ammonia water in a 60 ℃ water bath kettle, stirring until the ammonium paramolybdate is completely dissolved, and adding 85mL (NH)4)2S (ammonium sulfide, 8 wt% S) solution. Heating and stirring in a 60 ℃ water bath kettle for reaction for 2h, taking out, naturally cooling to room temperature, and completely crystallizing by using an ice bath.
(5) And (3) sequentially and alternately carrying out suction filtration and washing on the crystallized crystals by using deionized water and absolute ethyl alcohol.
(6) The above (NH)4)2MoS4Adding a precipitator into deionized water while stirring, dispersing for 30min uniformly, transferring into a 100mL polytetrafluoroethylene reaction kettle, putting the self-supporting precursor obtained in the step (3) into the reaction kettle, preserving heat for 6h at 120 ℃, performing suction filtration and washing on the obtained material by using deionized water, and drying in a 60 ℃ oven to obtain a product, namely the self-supporting CoMoS4A supercapacitor electrode.
Example 3:
(1) cutting conductive glass (FTO) into 1 x 2cm, and ultrasonically washing with glass cleaning agent, absolute ethyl alcohol and deionized water for multiple times until a water film is formed on the surface of the conductive glass. Then putting the mixture into an oven at 60 ℃ for drying for 2h for later use.
(2) 12.5mmol of Co (NO)3)2·6H2Dissolving O in 100mL deionized water to prepare Co-containing solution2+The metal salt mixture of (2) is stirred until completely dissolved. And adjusting the pH of the mixed solution to about 6 by using ammonia water to serve as an electrodeposition solution for later use.
(3) By usingAnd (3) in the three-electrode system, the conductive glass prepared in the step (1) is used as a working electrode, Ag/AgCl is used as a reference electrode, a Pt sheet is used as a counter electrode, and the solution prepared in the step (2) is used as electrolyte to carry out electrodeposition at normal temperature by using a constant potential step method. Wherein the deposition potential is-1.0V, and 900s is deposited at the potential to obtain Co (OH)2A self-supporting electrode material.
(4) Weighing 7.5g of ammonium paramolybdate, dissolving in 20mL of deionized water, stirring and adding 10mL of 25% ammonia water in a 60 ℃ water bath kettle, stirring until the ammonium paramolybdate is completely dissolved, and adding 85mL (NH)4)2S (ammonium sulfide, 8 wt% S) solution. Heating and stirring in a 60 ℃ water bath kettle for reaction for 2h, taking out, naturally cooling to room temperature, and completely crystallizing by using an ice bath. And respectively pumping, filtering and washing with deionized water and absolute ethyl alcohol for multiple times for later use.
(5) The (NH4) obtained in the step (4)2MoS4The precipitant is dissolved in 60mL deionized water and is magnetically stirred for 30min and then is transferred into a 100mL polytetrafluoroethylene reaction kettle. The self-supporting Co (OH) prepared in the step (3)2Putting the precursor into a reaction kettle, and carrying out heat preservation reaction for 10 hours at the temperature of 100 ℃. After the reaction is finished, washing the reaction product by deionized water and absolute ethyl alcohol for multiple times respectively, and drying the reaction product in a vacuum drying oven at the temperature of 60 ℃ for 2 hours to obtain a product, namely the CoMoS4A self-supporting electrode material.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (9)
1. Self-supporting CoMoS4The preparation method of the electrode material of the super capacitor is characterized by comprising the following steps:
(1) deposition of Co (OH) on Current collectors by electrodeposition2Obtaining self-supporting Co (OH)2Electrode precursors, or preparation of self-supporting Co (CO) by hydrothermal method3)0.5An OH electrode precursor;
(2) molybdenum sulfideHeating ammonium salt and ammonia water to react to produce ammonium molybdate, and adding (NH)4)2S reacts with ammonium molybdate to form (NH)4)2MoS4Cooling, crystallizing and aging to obtain (NH)4)2MoS4Precipitating;
(3) the (NH) obtained in the step (2)4)2MoS4Uniformly dispersing the precipitate in water, then putting the precipitate into the electrode precursor in the step (1) for hydrothermal reaction, and performing post-treatment to obtain the self-supporting CoMoS4And (3) a supercapacitor electrode material.
2. Self-supporting CoMoS according to claim 14The preparation method of the electrode material of the super capacitor is characterized in that the self-supporting electrode substrate subjected to electrodeposition in the step (1) is cleaned foamed nickel, carbon felt, carbon fiber paper, conductive glass or conductive carbon cloth.
3. Self-supporting CoMoS according to claim 1 or 24The preparation method of the electrode material of the super capacitor is characterized in that the electrodeposition in the step (1) adopts a three-electrode system, a counter electrode and a reference electrode are respectively a platinum sheet electrode and a silver chloride electrode, and electrodeposition solution Co2+Has a concentration of 0.002mol L-1～0.5mol L-1。
4. Self-supporting CoMoS according to claim 1 or 24The preparation method of the electrode material of the super capacitor is characterized in that the electrodeposition in the step (1) adopts constant potential deposition or constant current deposition, wherein the deposition potential is-0.3-1.5V vsAg/AgCl, the deposition current is 1-2000 mA, the deposition temperature is 20-90 ℃, and the pH value is controlled at 2.0-10.0.
5. Self-supporting CoMoS according to claim 14The preparation method of the electrode material of the supercapacitor is characterized in that the molar ratio of ammonium paramolybdate to ammonia water in the step (2) is 1 (Mo)7O24 6+):6(NH3)～1(Mo7O24 6+):12(NH3)。
6. Self-supporting CoMoS according to claim 14The preparation method of the electrode material of the super capacitor is characterized in that (NH) in the step (3)4)2MoS4Has a concentration of 0.05mol L-1～8mol L-1。
7. Self-supporting CoMoS according to claim 1 or 64The preparation method of the electrode material of the super capacitor is characterized in that the temperature of the hydrothermal reaction in the step (3) is 70-200 ℃, and the reaction time is 2-12 h.
8. Self-supporting CoMoS4Supercapacitor electrode material, characterized in that it is prepared by the preparation method of any one of claims 1 to 7.
9. The self-supporting CoMoS of claim 84The application of the electrode material of the super capacitor in the super capacitor.
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| CN114672822B (en) * | 2022-04-11 | 2023-05-23 | 华南理工大学 | Anti-perovskite-phase nitride three-dimensional self-supporting electrode material for preparing ammonia by nitrate reduction, and preparation method and application thereof |
| CN114920301A (en) * | 2022-06-14 | 2022-08-19 | 西安交通大学 | Electrode material based on multi-metal molybdate cluster and preparation method and application thereof |
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