CN110808176B - VO2/Co(OH)2Nano composite material and preparation method thereof and super capacitor - Google Patents
VO2/Co(OH)2Nano composite material and preparation method thereof and super capacitor Download PDFInfo
- Publication number
- CN110808176B CN110808176B CN201911065639.7A CN201911065639A CN110808176B CN 110808176 B CN110808176 B CN 110808176B CN 201911065639 A CN201911065639 A CN 201911065639A CN 110808176 B CN110808176 B CN 110808176B
- Authority
- CN
- China
- Prior art keywords
- nano
- composite material
- nano composite
- nanocomposite
- preparation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000002131 composite material Substances 0.000 title description 5
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 64
- 239000002114 nanocomposite Substances 0.000 claims abstract description 60
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 claims abstract description 56
- 239000002070 nanowire Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000007772 electrode material Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000002135 nanosheet Substances 0.000 claims abstract description 11
- 229910021580 Cobalt(II) chloride Inorganic materials 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000002105 nanoparticle Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000011065 in-situ storage Methods 0.000 claims abstract description 7
- 238000001764 infiltration Methods 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 3
- 239000012153 distilled water Substances 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 19
- 238000005406 washing Methods 0.000 claims description 19
- 239000002244 precipitate Substances 0.000 claims description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 10
- 239000004202 carbamide Substances 0.000 claims description 10
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- 241000446313 Lamella Species 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 238000005325 percolation Methods 0.000 claims description 2
- 239000012716 precipitator Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000013543 active substance Substances 0.000 abstract description 3
- 239000002243 precursor Substances 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- GRUMUEUJTSXQOI-UHFFFAOYSA-N vanadium dioxide Chemical compound O=[V]=O GRUMUEUJTSXQOI-UHFFFAOYSA-N 0.000 description 18
- 239000002086 nanomaterial Substances 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 4
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005234 chemical deposition Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000007600 charging Methods 0.000 description 2
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002121 nanofiber Substances 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 238000000859 sublimation Methods 0.000 description 2
- 230000008022 sublimation Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000314 transition metal oxide Inorganic materials 0.000 description 2
- -1 vanadyl chloride Chemical compound 0.000 description 2
- 229910021542 Vanadium(IV) oxide Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N nickel(II) oxide Inorganic materials [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(IV) oxide Inorganic materials O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000005469 synchrotron radiation Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000563 toxic property Toxicity 0.000 description 1
- WQEVDHBJGNOKKO-UHFFFAOYSA-K vanadic acid Chemical class O[V](O)(O)=O WQEVDHBJGNOKKO-UHFFFAOYSA-K 0.000 description 1
- 229910001456 vanadium ion Inorganic materials 0.000 description 1
- UUUGYDOQQLOJQA-UHFFFAOYSA-L vanadyl sulfate Chemical compound [V+2]=O.[O-]S([O-])(=O)=O UUUGYDOQQLOJQA-UHFFFAOYSA-L 0.000 description 1
- 229940041260 vanadyl sulfate Drugs 0.000 description 1
- 229910000352 vanadyl sulfate Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/46—Metal oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
-
- 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
- Y02E60/13—Energy storage using capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
VO (volatile organic compound)2/Co(OH)2A nano composite material, a preparation method thereof and a super capacitor belong to the field of super capacitor electrode materials. The VO2/Co(OH)2Nanocomposite of VO2The nano-wire is taken as a matrix material and carries nano-sheet layered Co (OH)2And (3) nanoparticles. The preparation method comprises the following steps: mixing VO according to the mixing-infiltration molar ratio2Nanowires and CoCl2·6H2Mixing O, adding water for dissolving, performing ultrasonic treatment, adding 0.05-5 mol/L ammonia water, dripping pure ammonia water to the pH value of 8-8.5, performing a standing reaction for 10-30 min for separation, cleaning and drying solid substances to obtain VO2/Co(OH)2A nanocomposite material. VO is used in the method2VO prepared by taking nano wire as precursor through in-situ self-growth method2/Co(OH)2The nano composite material is then used as an electrode material of a super capacitor. The electrode material can rapidly transfer electrons to an active substance, and the specific capacitance of the electrode material is greatly improved compared with that of a single material.
Description
Technical Field
The invention relates to the field of super capacitor electrode material development, in particular to VO2/Co(OH)2A nanocomposite material, a method for preparing the same and a supercapacitor.
Background
A supercapacitor, also known as an electrochemical capacitor, is a new energy storage device between a conventional capacitor and a battery, and has a higher energy density than the conventional capacitor, a higher power density than the battery, and a longer service life. In addition, a super capacitorThe device also has the advantages of high charging and discharging speed, wide use temperature range, economy and environmental protection, so that the super capacitor has wide application in the fields of portable electronic equipment, hybrid electric vehicles, national defense science and technology and the like. Electrode materials are one of two key factors determining the performance of the super capacitor, and research on the electrode materials has also become a main aspect of research on the super capacitor. Electrode materials can be classified into 3 types: carbon materials, transition metal oxides, and conductive polymers. Carbon materials (activated carbon, carbon nanotubes, graphene, etc.) achieve charge storage with an electric double layer formed by ion reversible adsorption at the electrode and electrolyte interface; and transition group metal oxide (RuO)2、MnO2、Co3O4Etc.) and conductive polymers (polyaniline, polypyrrole, etc.) mainly store charges by undergoing a rapid electrochemical redox reaction on the surface of an electrode or in a bulk phase.
Recent studies have shown that RuO2The oxides have excellent performance in electrochemical capacitance and conductivity, but their high price and toxic properties seriously hinder their practical application. Therefore, many researchers are working on finding low-cost, high-capacitance electrode materials, such as NiO and Co3O4，MnO2，Co(OH)2And the like. Wherein, Co (OH)2The super capacitor active material has a unique space nano-layered structure, good redox reaction activity and relatively rich resources, and becomes a super capacitor active material which is researched more in recent years. Recent studies on the capacitive properties have shown that Co (OH) prepared by conventional methods2The specific capacitance of (A) is 200 to 341 F.g-1In the range of 3458 F.g, and a theoretical value of 3458 F.g-1Therefore, Co (OH)2The specific capacitance of (c) has yet to be further improved. In addition, many researches also show that the capacitance value of the double-layer capacitor or the faradaic capacitor is closely related to the specific surface area of the material, so that the preparation of the nano material with higher specific surface area becomes a new idea for improving and enhancing the capacitive performance of the electrode material. Currently in the synthesis of Co (OH)2In the method of the nano material, a plurality of steps are mostly needed, the operation is complex, and the conditions are harsh. Therefore, further search was made forThe preparation method of the nano material has the advantages of mild reaction conditions, easy operation, wide application range and short flow. Co (OH)2In the synthesis of nano material, the selection of precipitant alkali is determined by target material, beta type is usually strong alkali (NaOH or KOH), alpha type is usually weak alkali (such as ammonia water or urea thermal decomposition), because of alpha-Co (OH)2Has a specific capacitance significantly higher than that of beta-Co (OH)2Has been of much interest to researchers in recent years, being alpha-Co (OH)2。
Among the transition metal oxides, vanadium dioxide has been attracting attention as having various crystal structure types. According to the findings of researchers, VO2There are seven types of structures. Among them, tetragonal rutile type, monoclinic rutile type, tetragonal type, orthorhombic system, tetragonal type and the like are known. At a temperature of 25 ℃, VO2The powder was dark blue in color and had a mass density of 4.260g/cm3. The melting point is 1545 ℃ at standard atmospheric pressure. At a temperature of 25 ℃, the powder is directly insoluble in water, but readily soluble in strong acids and bases. When dissolved in strong base, reacts with strong base to generate vanadic acid salt; VO when reacting with strong acid2The particles of (a) will gradually dissolve in the acid and the vanadium ions therein will be free in solution in the divalent state. VO (vacuum vapor volume)2One such structure is monoclinic rutile, which is a substance that undergoes a phase change on its own when subjected to a temperature change, and has a phase transition temperature of 68 ℃. When the temperature exceeds the phase transition temperature by 68 c, the phase transition occurs. The corresponding crystal structure is transformed into tetragonal rutile. In 2010, the Virginian project group in-situ researched VO by using synchrotron radiation variable-temperature ray absorption fine structure spectroscopy method2The insulator to metal phase transition mechanism of (1). VO (volatile organic compounds) promoted by synergistic effect of crystal structure transformation and electronic relevance extracted from atomic structure hierarchy2The microscopic mechanism of the transition from insulator to metal. The great theory is put forward to make VO2The clear presentation of the phase transformation mechanism is at the forefront of people, and the debate in this respect has been ended. VO accompanied by phase transition2Can also undergo significant changes in electrical and optical properties.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a VO2/Co(OH)2Nano composite material and its preparation method and super capacitor, VO2The nanometer line is used as a precursor, and VO is prepared by an in-situ self-growth method2/Co(OH)2The nano composite material is then used as an electrode material of a super capacitor. The electrode material can rapidly transfer electrons to active substances, Co (OH)2Nano-layered structure and VO2The fibrous nanostructure of (a) makes VO2/Co(OH)2Nanocomposites can have a relatively large specific surface area. VO after doping and infiltration2/Co(OH)2The specific capacitance of the nano composite material is greatly improved compared with that of a single material.
The technical scheme of the invention is as follows:
VO of the invention2/Co(OH)2Nanocomposite of VO2The nano-wire is taken as a matrix material and carries nano-sheet layered Co (OH)2And (3) nanoparticles.
The VO2/Co(OH)2In the nanocomposite, VO2The nano-wire plays a main supporting role and can effectively lead the nano-sheet layered Co (OH) with excellent electrical property2Separation, increase of surface area, effective reduction of Co (OH)2And (4) agglomeration.
The VO2/Co(OH)2Nanocomposite with a doping/percolation molar ratio of Co (OH)2：VO2(3-1): (1-3), the doping/infiltrating molar ratio is preferably 1: 1.
The nano-sheet layer Co (OH)2Nanoparticles of alpha-Co (OH)2The length of the lamella is 200-300 nm.
The VO2The nano-wire has a fiber diameter of 5-10 nm.
VO of the invention2/Co(OH)2The preparation method of the nano composite material comprises the following steps:
the method comprises the following steps:
according to the mixing and infiltration molar ratio, theVO2Nanowires and CoCl2·6H2Mixing O, adding water for dissolving, and performing ultrasonic treatment to obtain a uniform mixed aqueous solution;
step two:
adding ammonia water with the substance amount concentration of 0.05-5 mol/L into the mixed aqueous solution, stirring uniformly, titrating with pure ammonia water until the pH value of the solution is 8-8.5, forming a precipitate after a standing reaction is carried out for 10-30 min, standing until obvious layering occurs, and carrying out solid-liquid separation to obtain VO2/Co(OH)2A nanocomposite precipitate; wherein the reaction is carried out in the presence of ammonia and CoCl2·6H2O reaction to alpha-Co (OH)2Adding 0.05-5 mol/L ammonia water according to the stoichiometric ratio;
step three:
VO is introduced into a reactor2/Co(OH)2Washing the nano composite precipitate with distilled water for several times, then washing with anhydrous ethanol, finally washing with distilled water, placing into a freeze dryer, and drying to obtain dried VO2/Co(OH)2A nanocomposite material.
In the step one, VO in the mixed aqueous solution2The mass concentration of the nano-wire is 0.004mol/L, CoCl2The amount concentration of the substance(s) is based on and VO2Adjusting the doping and permeating molar ratio of the nano wire;
and in the second step, uniformly stirring, wherein the stirring time is preferably 5-10 min.
In the third step, the temperature in the freeze dryer is preferably 10 ℃ below zero to 4 ℃ below zero; the drying time is preferably 12 hours or more.
The VO2The preparation method of the nanowire is an in-situ growth method, and specifically comprises the following steps:
step 1:
preparing a mixed solution of vanadium oxide salt and urea by using the vanadium oxide salt as a vanadium source and the urea as a precipitator; wherein, in the mixed solution, the mass concentration of the vanadium oxide salt is 0.01-0.02 mol/L, and the mass concentration of the urea is 0.04-0.08 mol/L;
step 2:
placing the mixed solution of vanadium oxide salt and urea at 80-100 ℃ and preserving heat for 1-3 h to obtain a reacted solution;
and step 3:
standing the solution after reaction, separating solid and liquid after obvious layering, washing the obtained precipitate with distilled water for several times, washing with absolute ethyl alcohol for several times, washing with distilled water for solid and liquid separation, placing the precipitate washed with distilled water in a freeze dryer, and drying to obtain dried VO2A nanowire.
In the step 1, the vanadium oxide salt is one of vanadyl sulfate and vanadyl chloride.
In the step 3, the temperature in a freeze dryer is preferably 10 ℃ below zero to 4 ℃ below zero; the drying time is preferably 12 hours or more.
VO of the invention2/Co(OH)2The nano composite material is prepared by the preparation method.
VO of the invention2/Co(OH)2The application of the nano composite material is used as an electrode material of a super capacitor.
A super capacitor comprises VO2/Co(OH)2The specific capacitance of the electrode made of the nano composite material is 440-720F/g.
VO of the invention2/Co(OH)2The nano composite material, the preparation method thereof and the super capacitor have the advantages that:
1. VO is used in the invention2Nanowire as nanofiber matrix, doped nano-sheet layered Co (OH)2The particles are used as the electrode material of the super capacitor, electrons can be rapidly transferred to active substances, and the VO after permeation is almost unchanged under the premise that the stability of the electrode material is almost unchanged2The specific capacitance of the nanowire is greatly improved.
2. VO of the invention2/Co(OH)2The nano composite material is used as a super capacitor electrode material, realizes the integration of a current collector and a conductive agent in the electrode material, is different from the previous electrode material which is coated on the current collector by adding the conductive agent into a binder and the like, and has the advantages of strong interface binding force, shortened preparation process, reduced cost, and the likeLow electrolyte pollution and the like.
3. VO of the invention2/Co(OH)2Nanocomposite, in situ self-growth method, with VO2The nano-wire is taken as a matrix material and carries nano-sheet layered Co (OH)2Nanoparticles, nanosheet layered Co (OH)2Nanoparticles in VO2The composite material has a high specific surface area under the support of the nanowires, and is applied to a supercapacitor electrode material, so that high specific capacitance is obtained.
Drawings
FIG. 1 shows VO prepared in example 1 of the present invention2SEM images of nanowires; wherein a) and b) are VO2SEM images of different positions and different magnifications of the nanowires;
FIG. 2 shows VO prepared in example 1 of the present invention2Constant current charge and discharge curve of the nanowire;
FIG. 3 shows VO at different current densities prepared in example 1 of the present invention2The specific capacitance of the nanowire;
FIG. 4 shows a-Co (OH)2SEM image of (a) (wherein, b) is a partial enlarged view of a));
FIG. 5 shows a-Co (OH)2The constant current charge-discharge curve of (1);
FIG. 6 shows α -Co (OH) at different current densities2The specific capacitance of (d);
FIG. 7 shows Co (OH)2And VO2VO of different molar ratios2/Co(OH)2XRD pattern of the nanocomposite;
FIG. 8 is VO2And Co (OH)2SEM appearance (magnification is multiplied by 35000) of the doped nano composite material with the doping molar ratio of 1: 1;
FIG. 9 is VO2And Co (OH)2SEM appearance (magnification is multiplied by 27000) of doped nano composite material with the doping molar ratio of 1: 1;
FIG. 10 shows VO2And Co (OH)2VO doped with 1:1 of doping-infiltration molar ratio2/Co(OH)2Specific capacitance of the nanocomposite;
FIG. 11 shows VO at different current densities2/Co(OH)2The nanocomposite (V:co 1: 1);
FIG. 12 is VO2And Co (OH)2VO with doping-penetrating molar ratio of 1:12/Co(OH)2Energy spectra of the nanocomposites.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
VO (volatile organic compound)2/Co(OH)2The preparation method of the nano composite material comprises the following steps:
step 1: pure VO2Preparation of nanowires
In this embodiment, VOSO is selected4Is a vanadium source and is prepared into 0.01mol/LVOSO at room temperature4And 0.04mol/L urea, placing 40mL of the prepared mixed solution into a reaction kettle with a lining material of polytetrafluoroethylene, covering the reaction kettle tightly, and placing the reaction kettle into an oven with the temperature of 90 ℃ for heat preservation for 2 hours to obtain a solution after reaction.
The reacted solution was placed in a funnel and allowed to stand for a period of time until the precipitate was completely separated from the solution. Immediately washing the precipitate (sample) with distilled water, placing in the funnel again, repeatedly washing with distilled water for several times until the distilled water is clear, washing with anhydrous ethanol for three times, washing with distilled water, placing the precipitate washed with distilled water in a freeze dryer, and directly sublimation drying ice to obtain dry VO2A nanowire.
For prepared VO2The nanowires were analyzed and their microscopic morphology is shown in figure 1. Wherein, a) in FIG. 1 and b) in FIG. 1 are VO prepared in this example2SEM images of nanowires at different positions and different magnification ratios, from which it can be seen that fibrous VO can be clearly observed2Nanowires, which are very regularly arranged, have a crystalline structure. Fibrous VO2The nanowires have large gaps among the nanowires, and substances are easy to dope.
For prepared VO2The nanowires were subjected to specific capacitance analysis, VO in FIG. 22Constant current charge and discharge curve of nanowireThe observation in the figure shows that the test voltage of the curve is 0-0.45V, and the charge-discharge curve is tested when the current density is 1A/g. VO can be obtained by formula calculation2The specific capacitance of the nanowire at a current density of 1A/g was 166.67F/g.
FIG. 3 shows VO prepared in this example at different current densities2Trend of change of specific capacitance of the nanowire. VO with increasing current density2The specific capacitance of the nanowire gradually decreases.
Meanwhile, alpha-Co (OH) with the purity of 99 wt.% is prepared by adopting a chemical deposition method2And observing the microscopic morphology and testing the electrical properties of the material.
FIG. 4 shows a-Co (OH)2In the figure, a) and b) are alpha-Co (OH) prepared by chemical deposition2Wherein the b) image is a partial magnified view of the a) image. From the figure, alpha-Co (OH) can be observed2Is a nano-sheet structure, and alpha-Co (OH) can be deduced2Has a relatively large specific surface area.
FIG. 5 shows a-Co (OH)2The constant current charging and discharging curve of (2) can be observed from the figure, the test voltage of the curve is 0-0.45V, and the charging and discharging curve is tested when the current density is 1A/g. Calculated by the formula, alpha-Co (OH)2The specific capacitance at a current density of 1A/g was 526.67F/g.
FIG. 6 shows α -Co (OH) at different current densities2The specific capacitance of (2) is observed in the graph, and the test voltage of the curve is 0-0.45V, and the charge-discharge curve is tested when the current density is 1A/g. Calculated by the formula, alpha-Co (OH)2The specific capacitance at a current density of 1A/g was 526.67F/g.
Step 2: mixing the raw materials
VO to be prepared2Nanowires and CoCl2·6H2O is VO according to the doping-infiltration molar ratio2Nanowire: CoCl2·6H2O-3: 1, 2:1, 1:2, 1:3 were each weighed to a certain mass, and the weighed VOs were added2Nanowires and CoCl2·6H2O is placed in a beaker, and a constant volume of the solution is added into the beakerDistilled water is added in such an amount that the solution prepared is VO2The molar concentration of the nanowires is 0.004mol/L, and the solution is stirred at a constant speed for five minutes by using a glass rod, so that the red particles are completely dissolved in the distilled water. The solution was allowed to stand for 5min, and then the solution was sonicated for 1h to obtain a uniform mixed aqueous solution.
And step 3: deposition of
Preparing 0.1mol/L ammonia water at room temperature, adding 30mL of 0.1mol/L ammonia water into the uniform mixed solution, stirring for 5min by using a magnetic stirrer, maintaining the stirring, titrating by using pure ammonia water until the pH value of the solution is 8-8.5, and then standing for 10 min. Pouring the reacted solution and precipitate into a prepared beaker, then placing the solution into a funnel, and standing for a period of time until the precipitate and the solution are completely separated to obtain VO2/Co(OH)2And (3) nano composite precipitates.
And 4, step 4: cleaning of
Immediately make the VO2/Co(OH)2Washing the nano composite precipitate (sample) with distilled water, placing in the funnel again, repeatedly washing with distilled water for several times until the distilled water is clear, washing with anhydrous ethanol, repeatedly washing with distilled water, placing the precipitate in a freeze dryer, and directly sublimation drying ice to obtain dry VO2/Co(OH)2A nanocomposite material.
Drying VO2/Co(OH)2The nano composite material is placed in a ventilated place for air drying, and the dried VO is dried by utilizing a mortar2/Co(OH)2Grinding the nanocomposite into powder, and pulverizing VO into powder2/Co(OH)2The nano composite material is put into a sample bag and marked for standby.
FIG. 7 shows Co (OH)2And VO2When the doping and infiltration molar ratio of (A) is 3:1, 2:1, 1:2 and 1:3, VO2/Co(OH)2XRD of the nanocomposite. Diffraction peaks at 11.2 °, 23 °, 34 °, 50.6 ° and 60 ° can be seen. The strongest peak occurs at 34 deg.. As can be seen from the figure, Co (OH) can be found2And VO2A characteristic peak, intensity superposition,so that the peak value is highest here. As can be seen from the figure, Co (OH)2And VO2The characteristic peak appears at 60 degrees, so that VO is generated2/Co(OH)2The nanocomposite appeared at 60 ℃ with a characteristic peak intensity ratio of pure Co (OH)2And VO2High. Furthermore, Co (OH)2A characteristic peak at 22.3 degrees; from the figure, VO2There is a characteristic peak at 25.6 °. VO (vacuum vapor volume)2/Co(OH)2The nanocomposite material shows diffraction peaks at 22.3 ° to 25.6 °, and when one of the contents is higher, the diffraction peak is shifted more toward the higher content direction. From the figure, Co (OH)2Diffraction peaks at 11 °, 22.3 °, 34.2 °, 59.6 ° all appear, VO2Diffraction peaks at 25.6 degrees, 34 degrees, 50.7 degrees and 60.2 degrees clearly appear, and the prepared VO2/Co(OH)2The nanocomposite crystallized very well.
FIG. 8 is VO2And Co (OH)2The doped nano composite material with the molar ratio of 1:1 has SEM appearance with magnification of x 35000, FIG. 9 is SEM appearance with magnification of x 27000, and VO can be seen from the figure2The nano-wire is in a fiber shape, which shows that the characteristics of the nano-wire are not changed in the compounding process; co (OH)2The crystal is distributed in a layered mode, the length of a lamella layer is 200-300 nm, and the crystal has good crystallinity. VO (vacuum vapor volume)2Nanowire bundle certain amount of nanolaminated Co (OH)2Support, enable Co (OH)2The space between the layers increases. When following VO2Elevated content, fibrous VO per unit volume2The content is increased. With Co (OH)2Elevated content, fibrous VO per unit volume2The content is reduced. Co (OH)2Nano-layered structure and VO2The fibrous nanostructure of (a) makes VO2/Co(OH)2Nanocomposites can have a relatively large specific surface area.
FIG. 10 shows VO2And Co (OH)2The discharge curve of the nano composite material with the doping molar ratio of 1:1 under the current density of 1A/g is calculated to obtain the specific capacitance of each sample of 712.22F/g respectively, and Co (OH) obtained by a chemical deposition method2(pure) having a specific capacitance of 526.67F/g; precursor VO obtained by hydrothermal method2(pure), its specific capacitance was 166.67F/g. When VO is present2When the relative content is large, the content is VO2Relative to the specific capacitance alone of Co (OH)2The ratio is lower, and the total specific capacitance is reduced; when VO is present2At a lower relative content, due to Co (OH)2And the nano-particles are flaky, and when the content is excessive, the nano-particles are agglomerated, so that the specific capacitance is reduced. When Co (OH)2And VO2At a molar ratio of 1:1, VO is obtained2/Co(OH)2Nanocomposites have the highest specific capacitance.
FIG. 11 shows VO at different current densities2And Co (OH)2VO at the mixing-permeation molar ratio of 1:12/Co(OH)2The trend of the discharge specific capacitance of the nanocomposite material. It can be seen from the graph that the specific capacitance gradually decreases as the current density increases. The specific capacitance is 712.22F/g when the current density is 1A/g; when the current density is 10A/g, the specific capacitance is 340F/g. Comparative Co (OH)2(pure) with VO2The (pure) lift is much greater.
At the same time, for VO2And Co (OH)2VO with doping-penetrating molar ratio of 1:12/Co(OH)2The energy spectrum analysis of the nano composite material is carried out, the energy spectrum diagram is shown in figure 12, the energy spectrum analysis is respectively carried out on O, Co and V elements, the figure clearly shows that the elements are distributed evenly, and VO is2And Co (OH)2The bonding really occurs, and the bonding of the composite material is very good.
VO prepared in this example2/Co(OH)2The nano composite material is prepared by using a chemical in-situ synthesis method and using nanofiber VO2As a matrix material, nano-sheet shaped Co (OH) is loaded2Nanoparticles having a lamella length of 200-300 nm and a nanosheet-like Co (OH)2In a nanofiber-like VO2The composite material has a high specific surface area under the support of a matrix, and is applied to a supercapacitor electrode material, so that high specific capacitance is obtained.
VO prepared2/Co(OH)2Nanocomposite, in different Co (OH)2And VO2The specific capacitance of each sample in the ratios (a) was 596.23F/g (Co: V ═ 3:1), 581.56F/g (Co: V ═ 2:1), and 712.22F/g (Co: V ═ 2:1), respectively1:1), 461.78F/g (Co: V ═ 1:2), 446.22F/g (Co: V ═ 1: 3). Wherein the optimum ratio is Co (OH)2：VO2The specific capacitance reaches 712.22F/g at 1: 1.
Claims (7)
1. VO (volatile organic compound)2/Co(OH)2Nanocomposite material, characterized in that the VO2/Co(OH)2VO as nano composite material2The nano-wire is taken as a matrix material and carries nano-sheet layered Co (OH)2A nanoparticle;
the VO2/Co(OH)2Nanocomposite with a doping/percolation molar ratio of Co (OH)2 ：VO2=(3~1)：(1~3)；
The nano-sheet layer Co (OH)2Nanoparticles of alpha-Co (OH)2The length of the lamella is 200-300 nm;
the VO2The nano-wire has a fiber diameter of 5-10 nm.
2. VO according to claim 12/Co(OH)2The preparation method of the nano composite material is characterized by comprising the following steps:
the method comprises the following steps:
mixing VO according to the mixing-infiltration molar ratio2Nanowires and CoCl2·6H2Mixing O, adding water for dissolving, and performing ultrasonic treatment to obtain a uniform mixed aqueous solution;
step two:
adding ammonia water with the substance amount concentration of 0.05-5 mol/L into the mixed aqueous solution, stirring uniformly, titrating with pure ammonia water until the pH value of the solution is 8-8.5, forming a precipitate after a standing reaction is carried out for 10-30 min, standing until obvious layering occurs, and carrying out solid-liquid separation to obtain VO2/Co(OH)2A nanocomposite precipitate; wherein the reaction is carried out in the presence of ammonia and CoCl2·6H2O reaction to alpha-Co (OH)2Adding 0.05-5 mol/L ammonia water according to the stoichiometric ratio;
step three:
VO is introduced into a reactor2/Co(OH)2Washing the nano composite precipitate with distilled water for several times, and then with anhydrous ethanol, and finallyThen washing with distilled water, placing into a freeze dryer, and drying to obtain dried VO2/Co(OH)2A nanocomposite particle.
3. VO according to claim 22/Co(OH)2The preparation method of the nano composite material is characterized in that in the step one, VO in mixed aqueous solution2The mass concentration of the nano-wire is 0.004mol/L, CoCl2The amount concentration of the substance(s) is based on and VO2The doping and permeating molar ratio of the nano-wire is adjusted.
4. VO according to claim 22/Co(OH)2The preparation method of the nano composite material is characterized in that the VO2The preparation method of the nanowire is an in-situ growth method, and specifically comprises the following steps:
step 1:
preparing a mixed solution of vanadium oxide salt and urea by using the vanadium oxide salt as a vanadium source and the urea as a precipitator; wherein, in the mixed solution, the mass concentration of the vanadium oxide salt is 0.01-0.02 mol/L, and the mass concentration of the urea is 0.04-0.08 mol/L;
step 2:
placing the mixed solution of vanadium oxide salt and urea in a reaction kettle, and preserving heat for 1-3 hours at 80-100 ℃ to obtain a reacted solution;
and step 3:
standing the solution after reaction, separating solid and liquid after obvious layering, washing the obtained precipitate with distilled water for several times, washing with absolute ethyl alcohol for several times, washing with distilled water for solid and liquid separation, placing the precipitate washed with distilled water in a freeze dryer, and drying to obtain dried VO2A nanowire.
5. VO (volatile organic compound)2/Co(OH)2A nanocomposite material produced by the production method according to claim 2.
6. The method of claim 1VO described above2/Co(OH)2The application of the nano composite material is characterized in that the nano composite material is used as an electrode material of a super capacitor.
7. A supercapacitor characterized in that it comprises a VO according to claim 12/Co(OH)2The specific capacitance of the electrode made of the nano composite material is 440-720F/g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065639.7A CN110808176B (en) | 2019-11-04 | 2019-11-04 | VO2/Co(OH)2Nano composite material and preparation method thereof and super capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065639.7A CN110808176B (en) | 2019-11-04 | 2019-11-04 | VO2/Co(OH)2Nano composite material and preparation method thereof and super capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110808176A CN110808176A (en) | 2020-02-18 |
| CN110808176B true CN110808176B (en) | 2021-09-17 |
Family
ID=69501144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911065639.7A Active CN110808176B (en) | 2019-11-04 | 2019-11-04 | VO2/Co(OH)2Nano composite material and preparation method thereof and super capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110808176B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113314346A (en) * | 2021-06-07 | 2021-08-27 | 通号(北京)轨道工业集团有限公司轨道交通技术研究院 | Variable capacitance capacitor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101700909A (en) * | 2009-11-25 | 2010-05-05 | 中国科学技术大学 | Method of preparing intelligent energy-saving vanadium dioxide by hydrothermal method |
| CN103880080A (en) * | 2014-03-10 | 2014-06-25 | 中国科学院上海硅酸盐研究所 | Method for preparing vanadium dioxide powder through hydrothermal auxiliary homogeneous precipitation method |
| CN109300702A (en) * | 2018-10-26 | 2019-02-01 | 辽宁工程技术大学 | Co(OH)2/TiO2Nanotube array composite material and its preparation method |
-
2019
- 2019-11-04 CN CN201911065639.7A patent/CN110808176B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101700909A (en) * | 2009-11-25 | 2010-05-05 | 中国科学技术大学 | Method of preparing intelligent energy-saving vanadium dioxide by hydrothermal method |
| CN103880080A (en) * | 2014-03-10 | 2014-06-25 | 中国科学院上海硅酸盐研究所 | Method for preparing vanadium dioxide powder through hydrothermal auxiliary homogeneous precipitation method |
| CN109300702A (en) * | 2018-10-26 | 2019-02-01 | 辽宁工程技术大学 | Co(OH)2/TiO2Nanotube array composite material and its preparation method |
Non-Patent Citations (2)
| Title |
|---|
| "VO2(A) nanostructures with controllable feature sizes and giant aspect ratios: one-step hydrothermal synthesis and lithium-ion battery performance";Lei Dai,et al.;《RSC Advances》;20120411;第2卷;第5265-5270页 * |
| "多孔电极材料的构筑及其在超级电容器中的研究与应用";胡晨晨;《中国博士学位论文全文数据库 工程科技Ⅰ辑》;20181015(第10期);第B020-15页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110808176A (en) | 2020-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Khan et al. | VO2 nanostructures for batteries and supercapacitors: a review | |
| El-Deen et al. | Anatase TiO 2 nanoparticles for lithium-ion batteries | |
| Srinivasan et al. | Study on the electrochemical behavior of BiVO4/PANI composite as a high performance supercapacitor material with excellent cyclic stability | |
| Arasi et al. | Electrochemical property analysis of zinc vanadate nanostructure for efficient supercapacitors | |
| Bao et al. | Novel porous anatase TiO2 nanorods and their high lithium electroactivity | |
| Fu et al. | TiO2 nanorods anchor on reduced graphene oxide (R-TiO2/rGO) composite as anode for high performance lithium-ion batteries | |
| Ganganagappa et al. | One step synthesis of monoclinic VO2 (B) bundles of nanorods: Cathode for Li ion battery | |
| Du et al. | Synthesis of polycrystalline SnO2 nanotubes on carbon nanotube template for anode material of lithium-ion battery | |
| Cai et al. | Facile preparation of porous one-dimensional Mn2O3 nanostructures and their application as anode materials for lithium-ion batteries | |
| Wang et al. | Hydrothermal synthesis and electrochemical performance of NiO microspheres with different nanoscale building blocks | |
| Woo et al. | Cu3Si-doped porous-silicon particles prepared by simplified chemical vapor deposition method as anode material for high-rate and long-cycle lithium-ion batteries | |
| Zhang et al. | TiO 2-B nanowires via topological conversion with enhanced lithium-ion intercalation properties | |
| Wang et al. | α-Fe 2 O 3-mediated growth and carbon nanocoating of ultrafine SnO 2 nanorods as anode materials for Li-ion batteries | |
| Hou et al. | Facile synthesis of ZnFe 2 O 4 with inflorescence spicate architecture as anode materials for lithium-ion batteries with outstanding performance | |
| KR102423807B1 (en) | Process for preparing hexagonal molybdenum oxides nano rods | |
| Li et al. | Anchoring alpha-manganese oxide nanocrystallites on multi-walled carbon nanotubes as electrode materials for supercapacitor | |
| Liu et al. | Hierarchical Li4Ti5O12-TiO2 microspheres assembled from nanoflakes with exposed Li4Ti5O12 (011) and anatase TiO2 (001) facets for high-performance lithium-ion batteries | |
| Yu et al. | Mo-doped V 2 O 5 hierarchical nanorod/nanoparticle core/shell porous microspheres with improved performance for cathode of lithium-ion battery | |
| Yao et al. | Synthesis and electrochemical properties of α-Fe2O3 porous microrods as anode for lithium-ion batteries | |
| Li et al. | Template-sacrificed synthesis of polypyrrole nanofibers for lithium battery | |
| US20130337335A1 (en) | Negative electrode material for a secondary battery and method for manufacturing same | |
| Guan et al. | RGO/KMn8O16 composite as supercapacitor electrode with high specific capacitance | |
| Seok et al. | Piezoelectric composite of BaTiO3-coated SnO2 microsphere: Li-ion battery anode with enhanced electrochemical performance based on accelerated Li+ mobility | |
| Nagaraju et al. | Solution phase synthesis of Na0. 28V2O5 nanobelts into nanorings and the electrochemical performance in Li battery | |
| Rong et al. | One-step synthesis of carbon-coated monocrystal molybdenum oxides nanocomposite as high-capacity anode materials for lithium-ion batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |