CN106449138B - Carbon-coated cobalt molybdate mesh nano chip arrays material, preparation method and application - Google Patents
Carbon-coated cobalt molybdate mesh nano chip arrays material, preparation method and application Download PDFInfo
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- CN106449138B CN106449138B CN201610822600.5A CN201610822600A CN106449138B CN 106449138 B CN106449138 B CN 106449138B CN 201610822600 A CN201610822600 A CN 201610822600A CN 106449138 B CN106449138 B CN 106449138B
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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
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- Y02E60/13—Energy storage using capacitors
Abstract
The invention discloses a kind of carbon-coated cobalt molybdate mesh nano chip arrays materials, are made of nano-carbon film, cobalt molybdate mesh nano piece and nickel foam, and the setting that intersects of cobalt molybdate nano piece is grown in nickel foam, form cobalt molybdate mesh nano chip arrays；Nano-carbon film is coated on the surface of cobalt molybdate nano chip arrays；The invention also discloses the preparation methods of carbon-coated cobalt molybdate mesh nano chip arrays material, carbon-coated cobalt molybdate mesh nano chip arrays material prepared by the present invention can be used as the electrode material of supercapacitor, the specific capacitance and cycle performance of supercapacitor can be significantly improved, the method of the present invention is simple, the time is short, environmentally protective, low in cost, is suitble to industrialization scale of mass production.
Description
Technical field
The present invention relates to a kind of preparation methods of carbon-coated cobalt molybdate mesh nano chip arrays material, belong to super capacitor
The preparation field of device electrode material.
Background technique
Supercapacitor is also known as electrochemical capacitor, is a kind of novel energy-storing device between traditional capacitor and battery
Part, it has energy density more higher than traditional capacitor, power density more higher than secondary cell, while also having charge and discharge
Time is short, efficiency for charge-discharge is high, have extended cycle life, memory-less effect and it is substantially non-maintaining the advantages that, in mobile communication, information
Technology, consumer electronics, electric car, aerospace and science and techniques of defence etc. have important and wide application prospect, have become
For the hot spot of countries in the world research.
The difference of charge mechanism is stored according to electrode material, supercapacitor can be divided into double electric layers supercapacitor and farad
Fake capacitance supercapacitor.Double electric layers supercapacitor is deposited using the interfacial electric double layer formed between electrode and electrolyte
Storage lotus, storing electricity number depend on electrode material specific surface area size.Pseudocapacitors are using in electrode material table
The redox reaction that Rapid reversible occurs for face or near surface layer realizes charge storage.It is counterfeit compared with double electric layers supercapacitor
Capacitor can get higher specific capacitance and energy density, therefore have better development prospect.
The electrode material of pseudocapacitors is mainly all kinds of transition metal oxides, such as NiO, Co3O4、MnO2Deng.Due to these
Transition metal oxide conductivity is lower, it is suppressed that their electrochemical reaction, so the reality of most of transition metal oxide
Border specific capacitance is far below its theoretical values；Simultaneously structural stability of most of transition metal oxide in charge and discharge cycles compared with
Difference causes its cyclical stability poor, and cycle life is limited.
Recent domestic gradually increases the research of ternary metal oxide, wherein cobalt molybdate (CoMoO4) by pass
Note.Such as the self-assembly porous column array material of cobalt molybdate nano piece, in current density 4mAcm-2Specific capacitance is up to 1.92F cm-2
(Materials Letters.164(2016)260-263).But the conductivity and structural stability of cobalt molybdate material still compared with
Difference causes specific capacitance and cyclical stability that real requirement can't be fully achieved, and carrying out composite design to its structure is a solution
Decision is omited, such as CoMoO4@MnO2Core-shell type nano chip arrays are reported, in current density 3mA cm-2Specific capacitance reaches 2159.4F
g-1(J.Power Sources.296(2015)162-168)。
It is compound with graphene that the patent of Publication No. CN103779105A and CN103811189A propose cobalt molybdate, by
The high surface area of graphene and excellent electric conductivity improve the performance of active material.
The patent of Publication No. CN104821238A is using oleyl amine as carbon source in cobalt molybdate dusty material surface in situ packet
Cover one layer of carbon.But these research work still have some shortcomings, such as cobalt molybdate and MnO2It is compound to encounter MnO2Conductivity compared with
It is low, cause composite material whole conductivity decline the problem of；Although the compound conductivity that cobalt molybdate can be improved with graphene,
But this simple combination is limited to the structural stability of cobalt molybdate and the improvement result of cyclical stability；In molybdic acid cobalt dust material
It needs that electrode is made using slurry-scraping method using Chemical Felter after material surface in situ carbon coated, nonconducting binder increases interior
Resistance reduces carbon-coated effect, and the active material accumulation of this electrode is finer and close, can also reduce the electrochemistry of material
Activity, furthermore this composite material does not control the size and form of cobalt molybdate, will affect the chemical property of material yet.
Summary of the invention
The present invention provides a kind of carbon-coated cobalt molybdate mesh nano chip arrays materials, and provide carbon-coated molybdic acid
The preparation method of cobalt mesh nano chip arrays material, by the method for the invention prepared carbon-coated cobalt molybdate mesh nano piece
Array material is used for the electrode material of supercapacitor, makes supercapacitor specific capacitance with higher and good stable circulation
Property.
A kind of carbon-coated cobalt molybdate mesh nano chip arrays material, by nano-carbon film, cobalt molybdate mesh nano piece and bubble
Foam nickel composition, the cobalt molybdate nano piece setting that intersects are grown in nickel foam, form cobalt molybdate mesh nano piece battle array
Column；The nano-carbon film is coated on the surface of cobalt molybdate nano chip arrays.
The cobalt molybdate nano piece with a thickness of 60~80nm.
The mass content of carbon is 1%~30% in the carbon-coated cobalt molybdate mesh nano chip arrays material.
A kind of preparation method of carbon-coated cobalt molybdate mesh nano chip arrays material, the specific steps are as follows:
(1) carbohydrate is dissolved in deionized water, obtains carbohydrate solutions；
(2) nickel foam of surface growth cobalt molybdate mesh nano chip arrays is immersed in carbohydrate solutions, and in 110
4~6h of hydro-thermal reaction at~130 DEG C obtains the cobalt molybdate mesh nano chip arrays of carbohydrate cladding；
(3) the cobalt molybdate mesh nano chip arrays that carbohydrate coats are washed with deionized water, at 50~70 DEG C
Drying；
(4) the cobalt molybdate mesh nano chip arrays for coating the carbohydrate of drying are 300~500 DEG C under ar gas environment
4~6h is calcined, carbon-coated cobalt molybdate mesh nano chip arrays material is obtained.
In step (1), the carbohydrate be glucose, sucrose, maltose, starch and cellulose in extremely
Few one kind, preferably, the carbohydrate is glucose.
In step (1), the mass percent of the carbohydrate solutions is 0.01~1%.
The nickel foam of the described surface growth cobalt molybdate mesh nano chip arrays can be prepared by art methods or
Commercial product obtains, it is preferable that is prepared by the following method:
(a) cobalt nitrate, sodium molybdate are dissolved in deionized water, obtain mixed solution；
(b) nickel foam is immersed in mixed solution, and 4~6h of hydro-thermal reaction at 110~130 DEG C；Obtain surface growth
The nickel foam of cobalt molybdate mesh nano chip arrays；
(c) nickel foam of surface growth cobalt molybdate mesh nano chip arrays is washed with deionized water, at 50~70 DEG C
Drying.
In step (a), the molar ratio of the cobalt nitrate and sodium molybdate is 0.99~1.01:1.
In step (a), the molar concentration of the cobalt nitrate is 0.01~0.1mol L-1, the sodium molybdate rubs
Your concentration is 0.01~0.1mol L-1。
Carbon-coated cobalt molybdate mesh nano chip arrays material prepared by the present invention is a kind of excellent super capacitor electrode
Pole material.
Cobalt molybdate nano piece is grown directly upon in nickel foam, does not use fax between binder, with collector nickel foam
It leads good；The surface of nanometer sheet is fully exposed to electrolyte, and surface utilisation reaches maximization；The thickness of cobalt molybdate piece is nanometer
Grade, be conducive to the kinetics and stock utilization that improve cobalt molybdate.
In cobalt molybdate nano piece surface coating nano carbon film, carbon is had good conductive property, and can significantly improve cobalt molybdate
The conductivity of material, to improve fake capacitance reactivity；Cladding of the carbon film on cobalt molybdate nano piece surface can effectively improve molybdenum
Structural stability of the sour cobalt nanometer sheet in charge and discharge cycles, to improve its cyclical stability and cycle life；Above structure
Characteristic comprehensive function can significantly improve the utilization rate and specific capacitance and cycle charge discharge electrical property of cobalt molybdate.
The present invention is prepared for a kind of carbon-coated cobalt molybdate mesh nano chip arrays by the accurate control of hydro-thermal method twice
Material, the material prepare supercapacitor as electrode material, and the specific capacitance and cycle performance of supercapacitor are significantly mentioned
Height, the method for the present invention is simple, the time is short, environmentally protective, low in cost, is suitble to industrialization scale of mass production.
Detailed description of the invention
Fig. 1 is the XRD spectrum of cobalt molybdate mesh nano chip arrays prepared by comparative example 1；
Fig. 2 is the XRD spectrum of carbon coating cobalt molybdate mesh nano chip arrays prepared by embodiment 1；
Fig. 3 is the SEM figure of cobalt molybdate mesh nano chip arrays prepared by comparative example 1；
Fig. 4 is the SEM figure of carbon coating cobalt molybdate mesh nano chip arrays prepared by embodiment 1；
Fig. 5 is that carbon coating cobalt molybdate mesh nano chip arrays prepared by embodiment 1 and cobalt molybdate prepared by comparative example 1 are netted
Nano-chip arrays are in current density 1A g-1Charging and discharging curve figure；
Fig. 6 is that carbon coating cobalt molybdate mesh nano chip arrays prepared by embodiment 1 and cobalt molybdate prepared by comparative example 1 are netted
Nano-chip arrays are in current density 1A g-1Cycle performance compare figure.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention
It is described in detail.
Carbon coating cobalt molybdate mesh nano chip arrays material is prepared using hydro-thermal reaction twice.
Comparative example 1
It takes 0.875g cobalt nitrate and 0.725g sodium molybdate to be dissolved in 60mL deionized water, resulting mixed solution is moved into
In the ptfe autoclave of volume 100mL, by 2 × 2cm2Nickel foam immerse reaction kettle in mixed solution in, and will
Air dry oven is put into after reaction kettle sealing and is heated to 120 DEG C of reaction 5h, will take out surface after reaction kettle cooled to room temperature
Clean rear 60 DEG C of drying are washed with deionized water in the nickel foam for growing cobalt molybdate mesh nano chip arrays.
Embodiment 1
It takes 0.875g cobalt nitrate and 0.725g sodium molybdate to be dissolved in 60mL deionized water, resulting mixed solution is moved into
In the ptfe autoclave of volume 100mL, by 2 × 2cm2Nickel foam immerse reaction kettle in mixed solution in, and will
Air dry oven is put into after reaction kettle sealing and is heated to 120 DEG C of reaction 5h, will take out surface after reaction kettle cooled to room temperature
Clean rear 60 DEG C of drying are washed with deionized water in the nickel foam for growing cobalt molybdate mesh nano chip arrays；
It takes 0.119g glucose to be dissolved in 60mL deionized water, resulting glucose solution is moved into volume 100mL's
In ptfe autoclave, the nickel foam of surface growth cobalt molybdate mesh nano chip arrays is immersed in glucose solution, and
By reaction kettle it is closed after be put into air dry oven and be heated to 120 DEG C of reaction 5h, take out grape after reaction kettle cooled to room temperature
The cobalt molybdate mesh nano chip arrays of sugar cladding, 60 DEG C of drying, are then placed in quartz tube furnace, argon gas after deionized water wash clean
Lower 400 DEG C of calcinings 5h is protected, carbon-coated cobalt molybdate mesh nano chip arrays material is obtained.
Material obtained in comparative example 1 is subjected to XRD material phase analysis, analyzes result as shown in Figure 1, obtaining in comparative example 1
Material XRD spectrum and β-CoMoO4(JCPDF card number 21-0868) standard diagram coincide, and illustrates to grown in nickel foam
Cobalt molybdate.
Material obtained in embodiment 1 is subjected to XRD material phase analysis, analyzes result as shown in Fig. 2, obtaining in embodiment 1
Material XRD spectrum by β-CoMoO4The diffraction maximum of (JCPDF card number 21-0868) and C (JCPDF card number 75-2078) composition,
Illustrate that carbon is successfully combined on cobalt molybdate.
Material obtained in comparative example 1 is subjected to SEM observation, as a result as shown in Figure 3, it can be seen that cobalt molybdate nano piece is in
Netted setting is grown in nickel foam, nanometer sheet thickness about 70nm, has biggish hole that electrolyte is facilitated to enter between nanometer sheet, nanometer
Piece is fully exposed to electrolyte, and the fake capacitance reaction that may advantageously facilitate cobalt molybdate carries out.
Material obtained in embodiment 1 is subjected to SEM observation, as a result as shown in fig. 4, it can be seen that cobalt molybdate nano piece net
Shape array structure keeps good, and piece thickness is substantially unchanged, but nanometer sheet surface and edge become more smooth, display surface
Layer of substance, i.e. nano-carbon film are coated.Disclosing carbon content by EDS quantitative analysis is 18.6%, is found by EDS Surface scan
Carbon is equally distributed on cobalt molybdate nano piece surface.
Using carbon-coated cobalt molybdate mesh nano chip arrays material as Electrode, platinum plate electrode is to electrode, saturation
Calomel electrode (SCE) is reference electrode, 2mol L-1KOH aqueous solution is electrolyte, is assembled into three-electrode system, uses Lan electricity electricity
Pond tester carries out constant current charge-discharge test to it.
Fig. 5 is that carbon coating cobalt molybdate mesh nano chip arrays prepared by embodiment 1 and cobalt molybdate prepared by comparative example 1 are netted
Nano-chip arrays are in current density 1A g-1Charging and discharging curve figure.Discharge time after cobalt molybdate mesh nano chip arrays carbon coated
23% is extended, i.e. discharge capacity increases 23%.Meanwhile charging platform declines, discharge platform increases.Charging platform decline meaning
Taste charge efficiency improve, and discharge platform raising mean that discharge capability strengthens.Charging and discharging curve comparative illustration carbon coating
Improve the fake capacitance activity and specific capacitance of cobalt molybdate mesh nano chip arrays.
Fig. 6 is that carbon coating cobalt molybdate mesh nano chip arrays prepared by embodiment 1 and cobalt molybdate prepared by comparative example 1 are netted
Nano-chip arrays are in current density 1A g-1Cycle performance compare.Cobalt molybdate mesh nano chip arrays recycle electric discharge than electricity for the first time
Appearance is 1120F g-1, 250 circulation after increase to 1490F g-1, specific capacitance is gradually reduced later, until 1100 circulation specific capacitances
It is down to 1000F g-1, and keep to the 2000th recycling, the Average specific capacities of 2000 circulations are 1110F g-1.Carbon coating molybdenum
The electric discharge specific capacitance of circulation for the first time of sour cobalt mesh nano chip arrays is 1380F g-1, about 250 circulation after increase to 1860F g-1, specific capacitance is gradually reduced later, until 1100 circulation specific capacitances are down to 1510F g-1, specific capacitance slowly declines later, to
2000 circulations, specific capacitance 1200F g-1, the Average specific capacities 1480F g of 2000 circulations-1.Test shows that carbon coating is obvious
Improve the specific capacitance and cycle performance of cobalt molybdate mesh nano chip arrays.
Embodiment 2
It takes 0.524g cobalt nitrate and 0.436g sodium molybdate to be dissolved in 60mL deionized water, resulting mixed solution is moved into
In the ptfe autoclave of volume 100mL, by 2 × 2cm2Nickel foam immerse reaction kettle in mixed solution in, and will
Air dry oven is put into after reaction kettle sealing and is heated to 110 DEG C of reaction 6h, will take out surface after reaction kettle cooled to room temperature
Clean rear 50 DEG C of drying are washed with deionized water in the nickel foam for growing cobalt molybdate mesh nano chip arrays；
It takes 0.06g sucrose to be dissolved in 60mL deionized water, resulting sucrose solution is moved into the polytetrafluoro of volume 100mL
In ethylene reaction kettle, the nickel foam of surface growth cobalt molybdate mesh nano chip arrays is immersed in sucrose solution, and by reaction kettle
It is put into air dry oven after closed and is heated to 110 DEG C of reaction 6h, the molybdenum of sucrose cladding is taken out after reaction kettle cooled to room temperature
Sour cobalt mesh nano chip arrays, 50 DEG C of drying after deionized water wash clean are then placed in quartz tube furnace, argon gas protection lower 300
DEG C calcining 6h, obtain carbon-coated cobalt molybdate mesh nano chip arrays material.
Obtained carbon-coated cobalt molybdate mesh nano chip arrays material, the setting of cobalt molybdate mesh nano chip arrays are grown in
In nickel foam, nano-carbon layer is coated on cobalt molybdate nano piece surface, and it is 9.2% that EDS quantitative analysis, which discloses carbon content,.
Cyclic charging and discharging test, current density 1A g are carried out to it using identical 3 electrode system-1.Carbon-coated molybdic acid
The electric discharge specific capacitance of circulation for the first time of cobalt mesh nano chip arrays is 1250F g-1, 250 circulation after increase to 1710F g-1, it
Specific capacitance is gradually reduced afterwards, until 1000 circulation specific capacitances are down to 1410F g-1, specific capacitance slowly declines later, to the 2000th
Circulation, specific capacitance 1110F g-1, the Average specific capacities 1360F g of 2000 circulations-1。
Embodiment 3
It takes 1.222g cobalt nitrate and 1.016g sodium molybdate to be dissolved in 60mL deionized water, resulting mixed solution is moved into
In the ptfe autoclave of volume 100mL, by 2 × 2cm2Nickel foam immerse reaction kettle in mixed solution in, and will
Air dry oven is put into after reaction kettle sealing and is heated to 130 DEG C of reaction 4h, will take out surface after reaction kettle cooled to room temperature
Clean rear 70 DEG C of drying are washed with deionized water in the nickel foam for growing cobalt molybdate mesh nano chip arrays；
It takes 0.237g glucose to be dissolved in 60mL deionized water, resulting glucose solution is moved into volume 100mL's
In ptfe autoclave, the nickel foam of surface growth cobalt molybdate mesh nano chip arrays is immersed in glucose solution, and
By reaction kettle it is closed after be put into air dry oven and be heated to 130 DEG C of reaction 4h, take out grape after reaction kettle cooled to room temperature
The cobalt molybdate mesh nano chip arrays of sugar cladding, 70 DEG C of drying, are then placed in quartz tube furnace, argon gas after deionized water wash clean
Lower 500 DEG C of calcinings 4h is protected, carbon-coated cobalt molybdate mesh nano chip arrays material is obtained.
Obtained carbon-coated cobalt molybdate mesh nano chip arrays material, the setting of cobalt molybdate mesh nano chip arrays are grown in
Foam nickel surface, nano-carbon layer are coated on cobalt molybdate nano piece surface, and it is 24.3% that EDS quantitative analysis, which discloses carbon content,.
Cyclic charging and discharging test, current density 1A g are carried out to it using identical 3 electrode system-1.Carbon coating cobalt molybdate
The electric discharge specific capacitance of circulation for the first time of mesh nano chip arrays is 1200F g-1, 250 circulation after increase to 1640F g-1, later
Specific capacitance is gradually reduced, until 1000 circulation specific capacitances are down to 1330F g-1, specific capacitance slowly declines later, follows to the 2000th
Ring, specific capacitance 1070F g-1, the Average specific capacities 1250F g of 2000 circulations-1。
Technical solution of the present invention and beneficial effect is described in detail in above-described specific embodiment, Ying Li
Solution is not intended to restrict the invention the foregoing is merely presently most preferred embodiment of the invention, all in principle model of the invention
Interior done any modification, supplementary, and equivalent replacement etc. are enclosed, should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of carbon-coated cobalt molybdate mesh nano chip arrays material, which is characterized in that by nano-carbon film, cobalt molybdate is netted receives
Rice piece and nickel foam composition, wherein the setting that intersects of cobalt molybdate nano piece is grown in nickel foam, forms that cobalt molybdate is netted to be received
Rice chip arrays；The nano-carbon film is coated on the surface of cobalt molybdate nano chip arrays, the thickness of the cobalt molybdate nano piece
For 60~80nm；
The mass content of carbon is 1%~30% in the carbon-coated cobalt molybdate mesh nano chip arrays material；
The carbon-coated cobalt molybdate mesh nano chip arrays material the preparation method comprises the following steps:
(1) carbohydrate is dissolved in deionized water, obtains carbohydrate solutions；
(2) nickel foam of surface growth cobalt molybdate mesh nano chip arrays is immersed in carbohydrate solutions, and in 110~
4~6h of hydro-thermal reaction at 130 DEG C obtains the cobalt molybdate mesh nano chip arrays of carbohydrate cladding；
(3) the cobalt molybdate mesh nano chip arrays that carbohydrate coats are washed with deionized water, are dried at 50~70 DEG C；
(4) the cobalt molybdate mesh nano chip arrays for coating the carbohydrate of drying 300~500 DEG C of calcinings under ar gas environment
4~6h obtains carbon-coated cobalt molybdate mesh nano chip arrays material；
The nickel foam of the described surface growth cobalt molybdate mesh nano chip arrays the preparation method is as follows:
(a) cobalt nitrate, sodium molybdate are dissolved in deionized water, obtain mixed solution；
(b) nickel foam is immersed in mixed solution, and 4~6h of hydro-thermal reaction at 110~130 DEG C；Obtain surface growth molybdic acid
The nickel foam of cobalt mesh nano chip arrays；
(c) nickel foam of surface growth cobalt molybdate mesh nano chip arrays is washed with deionized water, is dried at 50~70 DEG C.
2. carbon-coated cobalt molybdate mesh nano chip arrays material according to claim 1, which is characterized in that in step
(1) in, the carbohydrate is at least one of glucose, sucrose, maltose, starch and cellulose.
3. carbon-coated cobalt molybdate mesh nano chip arrays material according to claim 1, which is characterized in that in step
(1) in, the mass percent of the carbohydrate solutions is 0.01~1%.
4. carbon-coated cobalt molybdate mesh nano chip arrays material according to claim 1, which is characterized in that in step
(a) in, the molar ratio of the cobalt nitrate and sodium molybdate is 0.99~1.01:1.
5. carbon-coated cobalt molybdate mesh nano chip arrays material according to claim 1, which is characterized in that in step
(a) in, the molar concentration of cobalt nitrate is 0.01~0.1mol L in the mixed solution-1, molybdic acid in the mixed solution
The molar concentration of sodium is 0.01~0.1mol L-1。
6. according to claim 1~5 described in any item carbon-coated cobalt molybdate mesh nano chip arrays materials prepare it is super
The application of capacitor electrode material.
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| CN108314092B (en) * | 2017-12-29 | 2020-10-23 | 安泰科技股份有限公司 | Foam nickel loaded nano rod-shaped cobalt molybdate and preparation method and application thereof |
| CN108232157A (en) * | 2018-01-04 | 2018-06-29 | 济南大学 | A kind of carbon coating molybdic acid nickel electrode material and preparation method thereof |
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