KR20130047885A - Method for fabrication of charge storage in multi-walled carbon nanotube-niooh nano composites - Google Patents
Method for fabrication of charge storage in multi-walled carbon nanotube-niooh nano composites Download PDFInfo
- Publication number
- KR20130047885A KR20130047885A KR1020110112692A KR20110112692A KR20130047885A KR 20130047885 A KR20130047885 A KR 20130047885A KR 1020110112692 A KR1020110112692 A KR 1020110112692A KR 20110112692 A KR20110112692 A KR 20110112692A KR 20130047885 A KR20130047885 A KR 20130047885A
- Authority
- KR
- South Korea
- Prior art keywords
- niooh
- electrode
- nickel hydroxide
- mwnt
- prepared
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/36—Nanostructures, e.g. nanofibres, nanotubes or fullerenes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- 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
Abstract
According to the present invention, carbon nanotubes having a porous structure are deposited in an aqueous solution in which nickel hydroxide (Ni (NO 3 ) 2 ㆍ 6H 2 O) is dissolved, followed by nanometer-thick carbon in NiOOH (nickel hydroxide) using chemical precipitation. A method of manufacturing a nanocomposite electrode formed with nanotubes, comprising: (a) preparing an aqueous nickel hydroxide (Ni (NO 3 ) 2 .6H 2 O) solution in a temperature range of 20 to 30 ° C .; (b) depositing and dispersing and drying carbon nanotubes having a porous structure in the nickel hydroxide (Ni (NO 3 ) 2 .6H 2 O) aqueous solution; (c) heat-treating the prepared nickel hydroxide (Ni (NO 3 ) 2 .6H 2 O) and a carbon nanotube mixture at 200 to 250 ° C., and (d) mixing the mixture with an active material, a binder, and a solvent. It comprises the step of preparing the electrode. According to the present invention, an electrode can be manufactured relatively easily using a chemical precipitation method that can be easily controlled, and mass production of NiOOH / MWNT nanocomposite electrodes is possible by controlling the chemical precipitation method, and the prepared NiOOH / MWNT The nanocomposite electrode exhibited pseudocapacitor behavior in which the relationship between current and voltage was very similar to that of capacitor in its electrochemical characterization, and showed very high specific capacitance, energy density, and output density. Usefulness is expected as the manufacture of a supercapacitor to retain.
Description
The present invention relates to a method for manufacturing a NiOOH / MWNT (nickel hydroxide hydroxide-carbon nanotube) nanocomposite electrode prepared by chemical precipitation, and more particularly, nickel hydroxide (Ni (NO 3 ) 2 ㆍ 6H 2 O) The present invention relates to a method of manufacturing a nanocomposite electrode in which carbon nanotubes having a porous structure are deposited in a dissolved aqueous solution, and then nanometer-thick carbon nanotubes are formed in NiOOH (nickel hydroxide) using chemical precipitation.
The development of eco-friendly small, medium and large-sized high-efficiency, high-density, high-power electrical energy storage and supply devices is essential for advanced nations in the 21st century. It is being promoted by development technology. All of the next generation energy storage systems that are being developed recently use electrochemical principles, such as lithium ion secondary batteries and electrochemical capacitors. In particular, the electrochemical capacitor technology for high power electrical energy storage is a new technology being developed in Japan and the United States as a high power small portable power source and a medium and large power source following the high capacity lithium-based secondary battery currently commercialized as an energy storage and supply device technology.
Secondary cells are excellent in terms of the amount of energy they can accumulate per unit weight or volume, ie energy density, but there is still much room for improvement in terms of cycle life, charging time and power density of energy available per unit time. Is showing. However, the electrochemical capacitor (electrochemical capacitor) is smaller than the secondary battery in terms of energy density, but shows very excellent characteristics compared to the secondary battery in terms of use time, charging time, power density. Therefore, research and development for improving the energy density in the case of electrochemical capacitors are actively progressing.
The electrochemical capacitor using the electrochemical principle is based on the electric double layer capacitor (EDLC) using the principle of the electric double layer, and the high capacitance due to pseudocapacitance generated in the Faradic process. It is divided into a supercapacitor or a supercapacitor expressing a dose. EDLC electrode materials are typical of activated carbon powders with large specific surface area and uniformly controlled pore distribution, but their use range is limited for low current due to low accumulation capacity and high internal resistance. However, when the metal oxide is used as the electrode material, the storage capacity can be 10 times higher than that of the EDLC, and high current output is possible due to the low internal resistance, indicating high output and high capacity. The metal oxide electrode materials researched and developed so far are ruthenium oxide, iridium oxide, nickel oxide, cobalt oxide, manganese oxide, and nickel hydroxide. (OH) 2 ), cobalt hydroxide (Co (OH) 2 ), and the like have been reported. Although ruthenium oxide shows the best electrochemical behavior, it is difficult to commercialize and commercialize due to the difficulty of manufacturing expensive raw materials and oxide electrodes.
Recently, relatively inexpensive nickel compound / activated carbon composites have been widely studied as supercapacitor electrode materials. Among the nickel compounds, NiOOH (nickel hydroxide) is an alkaline active cathode material, especially in zinc nickel batteries, which has a higher current density and a discharge voltage of 1.6V, which has a higher capacitor value than conventional alkaline manganese batteries. For this reason, it has become a promising digital battery material.
Although NiOOH has a strong oxidation reaction and a strong oxidation reaction in alkaline aqueous solution, its use has been limited due to the instability in alkaline electrolyte and the high resistance of NiO. Recently, many studies have been conducted to improve the reversibility, discharge properties, and proton diffusion rates of nickel compound / activated carbon nanocomposite electrodes. Multi-Walled Carbon Nanotubes (MWNTs) are spotlighted as electrode materials for supercapacitors, and are porous materials in a unique network form with excellent electrical conductivity. This unique network shape and porous structure facilitate the contact between the electrode and the electrolyte, which accelerates the movement of the electrolyte ions and removes the inhibitors of the diffusion of the electrolyte ions. In addition, MWNTs improve electrical conductivity, power density and service life. However, long service life and relatively high charge / discharge current are pointed out as disadvantages.
The present invention is a simple process of depositing a carbon nanotube thin film having a porous structure in a nickel hydroxide (Ni (NO 3 ) 2 · 6H 2 O) aqueous solution to produce a nanocomposite electrode by chemical precipitation method, and then heat treatment, reversible, discharge In order to improve the physical properties and the diffusion rate of protons, the present invention can be made from the fact that NiOOH / MWNT nanocomposite electrodes can be prepared for use of ultracapacitors (2436F / g) under mild conditions of normal temperature and atmospheric pressure. It was completed.
Therefore, an object of the present invention is to manufacture a NiOOH / MWNT nanocomposite electrode for supercapacitor electrode using a chemical precipitation method that is easy to control the process and mass production.
In order to achieve the above object, the present invention provides a method for producing a nickel oxide hydroxide-carbon nanotube composite electrode,
According to the present invention, an electrode can be manufactured relatively easily using a chemical precipitation method that can be easily controlled, and mass production of NiOOH / MWNT nanocomposite electrodes is possible by controlling the chemical precipitation method, and the prepared NiOOH / MWNT The nanocomposite electrode exhibited pseudocapacitor behavior in which the relationship between current and voltage was very similar to that of capacitor in its electrochemical characterization, and showed very high specific capacitance, energy density, and output density. Usefulness can be expected as the production of supercapacitors to be retained.
1 is a flow chart showing a method for manufacturing a NiOOH / MWNT nanocomposite electrode prepared using the chemical precipitation method according to the present invention.
Figure 2 is a NiOOH / MWNT nanocomposite electrode phase analysis graph prepared using the chemical precipitation method according to the present invention.
Figure 3 is a graph of the electrode binding structure analysis NiOOH / MWNT nanocomposite prepared by using the chemical precipitation method according to the present invention.
Figure 4 is an image photograph showing the microstructure change according to the change of MWNT content of the NiOOH / MWNT nanocomposite prepared using the chemical precipitation method according to the present invention, a) is raw MWNTs, b) is NiOOH precusor, c ) Is 10 wt.% MWNTs, d) is 30 wt.% MWNTs, e) is 50 wt.% MWNTs, f) is 70% MWNTs, and g) is 90% MWNTs.
5 is a graph illustrating thermal behavior change of NiOOH / MWNT nanocomposites prepared using the chemical precipitation method according to the present invention.
6 is a graph showing a cyclic voltammogram curve according to the change in MWNT content of NiOOH / MWNT nanocomposites prepared using the chemical precipitation method according to the present invention.
Figure 7 is a NiOOH / MWNT nanocomposite prepared by using the chemical precipitation method according to the present invention, (a) is the specific capacitance according to the change of the scan rate, (b) specific capacitance and specific ratio according to the change of MWNT content A graph showing the surface area change.
8 is a graph showing the resistance according to the change in the MWNT content of the NiOOH / MWNT nanocomposite electrode prepared using the chemical precipitation method according to the present invention.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In Figure 1, it shows a method for producing a NiOOH / MWNT nanocomposite electrode using the chemical precipitation method of the present invention.
First, to prepare a nickel hydroxide (Ni (OH) 2 ) aqueous solution in the range of 20 ~ 30 ℃ (S1), in the present invention to prepare a NiOOH / MWNT nanocomposite electrode using a chemical precipitation method, as shown in FIG. Prepare an aqueous solution of Ni (NO 3 ) 2 .6H 2 O.
The 0.1 M aqueous nickel hydroxide (Ni (OH) 2 ) solution is prepared by dissolving a transition metal salt in deionized water. At this time, it should be sufficiently mixed using a stirrer. In addition, the temperature of the aqueous nickel hydroxide (Ni (OH) 2 ) solution is adjusted to 10 ~ 20 ℃, if the temperature is less than 10 ℃ is not dissolved well to prepare a nickel hydroxide (Ni (OH) 2 ) electrodeposition liquid If the temperature is more than 20 ℃, it is difficult to cause the problem of evaporation of the aqueous solution, it is good to maintain a temperature range of 10 to 20 ℃.
Next, carbon nanotubes having a three-dimensional nanoporous structure are deposited, dispersed and dried in an aqueous nickel hydroxide (Ni (OH) 2 ) solution (S2). MWNT is dipped into the aqueous solution in which the metal oxide prepared above is dissolved. The mixture to which MWNT is added is dispersed through an ultrasonic disperser for 1 hour and then dried while mixing at 100 ° C. for 1 hour using a hot plate.
Next, the prepared nickel hydroxide (Ni (OH) 2 ) and the carbon nanotube mixture is heat-treated at 200 ~ 250 ℃ (S3). That is, the NiOOH / MWNT nanocomposite electrode is heat-treated at 200 to 250 ° C., and the heat-treated NiOOH / MWNT nanocomposite is required to make particles uniform through grinding for dispersion during electrode production.
In addition, an electrode is prepared in the mixture through an active material, a binder, a solvent, and a mixed ultrasonic process (S4). In order to prepare the electrode for the electrochemical characterization, the active material (NiOOH / MWNTs Nanocomposite) and the binder (Polyvinylidine Fluoride, PVDF) were mixed in a well-balanced NMP (N-Methyl Pyrrolidone) solvent at a ratio of 85: 15, respectively. slurry). The slurry was coated with a titanium pipe (Ti Foil, 10 mm × 10 mm) with a micro pipette, dried at room temperature for 12 hours, and dried at 120 ° C. in a vacuum oven for 12 hours.
The crystal structure of the prepared NiOOH / MWNT nanocomposite electrode is X-ray diffraction (X-ray Diffraction, XRD, D / MAX-2,500V, RIGAKU) and Fourier Transform Infrared Spectroscopy (FT-IR, EQUINOX55, BRUKER). In addition, to examine the microstructure and thermal behavior of NiOOH / MWNT nanocomposites, a thermogravimetric differential thermal analysis (TG-DTA, STA 402, NETZSCH) and a field emission scanning electron microscope Microscope, FE-SEM, S-4700, HITACHI, Japan) to observe.
In addition, electrochemical characterization was performed using a three-electrode system, platinum (Pt, 20mm × 20mm) was used as a counter electrode, and 3M Ag / AgCl electrode was used as a reference electrode. As the supporting electrolyte, 1M KOH electrolyte was used, and the evaluation potential range was -0.2 ~ 0.5V, and the electrochemical characteristics of IM6 (IM6ex, ZHANER, Germany) were measured by cyclic voltammetry (CV) and impedance. Evaluation was made using the equipment.
The following describes the embodiment of the present invention in more detail, but the present invention is not limited thereto.
2 is
3 shows the infrared spectral spectrum of NiOOH. The broad absorption peak bands of 3598 cm -1 and 3399 cm -1 are believed to be due to vibrations of water molecules or H-bound OH bonds. It was confirmed by vibration coupling of H 2 O molecules in the interval of 1639 cm -1 and 1635 cm -1 . Other absorption peaks (Peak) can not be confirmed as having a relatively weak absorption peak with carbonate carbonate (Carbonate ions), which may be due to the low concentration of carbonate ions. Also, 1387cm -1 and 982cm -1 sharp absorption peak is a characteristic of NO 3-, 712cm -1 was identified as the absorption peak caused by the vibration of the Ni-OH, small and weak peak of 493 is coupled to the vibration of the Ni-O Judging by Therefore, the crystal phase obtained by XRD through FT-IR could be more accurately identified by FT-IR.
4 shows the results of the microstructure analysis using FE-SEM. a) is the initial powder of MWNTs, it can be confirmed that it has a length of 1 ~ 3㎛, b) shows the NiOOH powder and small particles agglomerate to form the secondary large particles were observed. MWNTs are dispersed in NiOOH to enclose NiOOH powder and show a deadlock structure. Small MWNTs with a diameter of 10-15 nm and large MWNTs with a thickness of 60-70 nm were observed to have irregular bundles. The initial diameter of the MWNTs was found to decrease in diameter from 50 to 70 nm, which is believed to have converted the length and diameter due to dispersion during the ultrasonic dispersion process.
Figure 5 shows the change in thermogravimetric reduction of NiOOH / MWNTs nanocomposites. The weight loss of 38% appeared at 400 ℃ and it was confirmed that a sharp weight loss occurs at 25 ~ 300 ℃. This phenomenon occurs due to the weight loss of the hydroxide. In the temperature range of 290 ~ 370 ℃, the weight loss occurs because the water molecules in the lattice completely evaporated, which is believed to appear as the water evaporates due to the combination of the hydrate layer and the anion (CO 3 2- , NO 3- ). When the content of MWNT is 90% it was confirmed that the weight loss change of 89% occurs at about 890 ℃.
FIG. 6 shows the results of cyclic voltammetry (CV) of NiOOH / MWNTs nanocomposite electrodes measured at a scan rate of 10 mV / s for electrochemical characterization. As a result of the Faraday reaction of NiOOH, two oxidation and reduction peaks were observed. The Faraday reaction that takes place on the surface of the NiOOH / MWNTs nanocomposite follows the following equation.
(Scheme 1)
NiOOH + OH - = NiO + H 2 O + e -
Anodic peak shows the oxidation peak of NiO and NiOOH, and cathodic peak has the reaction of reduction. The typical CV curve shape is represented by a square shape, which is characteristic of the electric double buffer capacitor. However, the redox peak was observed in FIG. 6, which occurs through the diffusion of NiOOH. In addition, the CV curve of the MWNTs added electrode is observed to be wider than the electrode is expected to exhibit higher electrochemical properties than the electrode using the MWNTs as a conductive material. This causes the tube-shaped MWNTs to be connected in the form of a network to improve the conductivity of the electrode, NiOOH active material may have a higher specific capacitance value. However, an increase in MWNTs above a certain amount may lead to aggregation of MWNTs, which may be caused by a low electric conductivity and low capacitance value, and may be obtained only when the MWNTs are uniformly dispersed. This shows that the MWNTs content is 50% as a critical point, and shows a lower storage capacity at higher contents. The specific capacitance value of NiOOH / MWNTs nanocomposite electrode was calculated by the following equation.
(Equation 1)
C st = I a + I c / 2w (dv / dt)
Here, I a and I c represent the currents of oxidation and reduction, w is the weight, and dv / dt is the scan speed (V / S).
FIG. 7A is a graph showing specific capacity of NiOOH / MWNTs nanocomposites according to the content of MWNTs and scan rate (Sscan Rate), and FIG. 7B is a graph showing the MWNTs of scan rate (10 mV / s) and specific surface area. The data shows the specific capacitance according to the content. In FIG. 7A, the specific capacitance values of the NiOOH and NiOOH / MWNTs (50 wt.%) Nanocomposites were 58.63 and 2436.57 F / g, respectively. In FIG. 7B, the specific storage capacity of the MWNTs was increased to 50 wt.%. As shown in the figure, as the weight of the MWNTs is further increased based on 50wt.%, It was confirmed that the specific capacity decreases.
The specific surface area value of 50wt.% Was 274.32m is confirmed to be increased rapidly in 2 / g, is reduced because of slow in 90wt.% To saturation has a specific surface area value of 190.02m 2 / g. The redox reaction of NiOOH increases due to the increase of specific surface area, and the electrical resistance decreases due to the increase of MWNTs.
8 is an impedance measurement result of NiOOH / MWNTs nanocomposites. Impedances are complex resistors resulting from resistance, capacitors, and inductors that hinder the movement of current in an electrical circuit. A representative method of plotting impedance is the Nyquist Plot. Nyquist plots are labeled with a real part on the X-axis and an imaginary part on the Y-axis, including the resistance (Rs) of the electrolyte solution itself, the resistance (Rp) related to the charge transfer reaction, and the capacitor (Cdl) related to the double layer. There is an advantage in that you can see the complex resistance on the glance. It was confirmed that the NiOOH / MWNTs (50wt.%) Nanocomposite had a value of about 5, and in the case of NiOOH it was confirmed that it has a value of 100 or more. The electrical conductivity was also improved due to the increase of MWNTs content in the NiOOH / MWNTs nanocomposite.
As described above, according to a preferred embodiment of the present invention, the electrode can be prepared relatively easily by using the chemical precipitation method which is easy to control the process, and the NiOOH / MWNT nanocomposite electrode by controlling the factor of the chemical precipitation method Mass production of is possible. The prepared NiOOH / MWNT nanocomposite electrode exhibited pseudocapacitor behavior very similar to that of the capacitor in the electrochemical characterization of the NiOOH / MWNT nanocomposite electrode, and showed very high specific capacitance, energy density and power density. Usefulness can be expected as the production of a supercapacitor which maintains a high specific storage capacity.
Although the present invention has been described with reference to specific embodiments, it will be apparent that the technology of the present invention can be easily modified by those skilled in the art, such modified embodiments are included in the technical idea described in the claims of the present invention will be.
Claims (5)
(b) depositing and dispersing and drying carbon nanotubes having a porous structure in the nickel hydroxide (Ni (NO 3 ) 2 .6H 2 O) aqueous solution;
(c) heat treating the prepared nickel hydroxide (Ni (NO 3 ) 2 .6H 2 O) and a carbon nanotube mixture at 200 to 250 ° C., and
(D) a method for producing a nickel oxide hydroxide-carbon nanotube nanocomposite electrode comprising the step of preparing an electrode by mixing with the active material, a binder, a solvent in the mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110112692A KR20130047885A (en) | 2011-11-01 | 2011-11-01 | Method for fabrication of charge storage in multi-walled carbon nanotube-niooh nano composites |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110112692A KR20130047885A (en) | 2011-11-01 | 2011-11-01 | Method for fabrication of charge storage in multi-walled carbon nanotube-niooh nano composites |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20130047885A true KR20130047885A (en) | 2013-05-09 |
Family
ID=48659143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020110112692A KR20130047885A (en) | 2011-11-01 | 2011-11-01 | Method for fabrication of charge storage in multi-walled carbon nanotube-niooh nano composites |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20130047885A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101629783B1 (en) | 2015-01-14 | 2016-06-13 | 한남대학교 산학협력단 | Surface-modified carbon nanotube electrodes for supercapacitor and method for manufacturing the same |
| KR20170051575A (en) * | 2015-10-29 | 2017-05-12 | 한국기계연구원 | Photoelectrode for PEC cell including nanoparticles of metal oxide hydroxide and capping layer of graphene and hybrid organic PEC cell having them |
| CN106952744A (en) * | 2017-03-13 | 2017-07-14 | 黄冈师范学院 | A kind of laminar sized nickel hydroxide/carbon composite material and its preparation method and its application in ultracapacitor is prepared |
| CN108172412A (en) * | 2017-12-24 | 2018-06-15 | 桂林理工大学 | The preparation method of polypyrrole/nickel hydroxide composite electrode material for super capacitor |
| CN108682564A (en) * | 2018-05-23 | 2018-10-19 | 济南大学 | A kind of Ni-C composite material and preparation methods for ultracapacitor |
-
2011
- 2011-11-01 KR KR1020110112692A patent/KR20130047885A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101629783B1 (en) | 2015-01-14 | 2016-06-13 | 한남대학교 산학협력단 | Surface-modified carbon nanotube electrodes for supercapacitor and method for manufacturing the same |
| KR20170051575A (en) * | 2015-10-29 | 2017-05-12 | 한국기계연구원 | Photoelectrode for PEC cell including nanoparticles of metal oxide hydroxide and capping layer of graphene and hybrid organic PEC cell having them |
| CN106952744A (en) * | 2017-03-13 | 2017-07-14 | 黄冈师范学院 | A kind of laminar sized nickel hydroxide/carbon composite material and its preparation method and its application in ultracapacitor is prepared |
| CN108172412A (en) * | 2017-12-24 | 2018-06-15 | 桂林理工大学 | The preparation method of polypyrrole/nickel hydroxide composite electrode material for super capacitor |
| CN108682564A (en) * | 2018-05-23 | 2018-10-19 | 济南大学 | A kind of Ni-C composite material and preparation methods for ultracapacitor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chen et al. | Construction of core–shell NiMoO4@ Ni-Co-S nanorods as advanced electrodes for high-performance asymmetric supercapacitors | |
| Gui et al. | Scalable Wire‐Type Asymmetric Pseudocapacitor Achieving High Volumetric Energy/Power Densities and Ultralong Cycling Stability of 100 000 Times | |
| Tang et al. | Hydrothermal synthesis of a flower-like nano-nickel hydroxide for high performance supercapacitors | |
| Zhu et al. | 3D carbon/cobalt‐nickel mixed‐oxide hybrid nanostructured arrays for asymmetric supercapacitors | |
| Zheng et al. | Hierarchical structures composed of MnCo 2 O 4@ MnO 2 core–shell nanowire arrays with enhanced supercapacitor properties | |
| Cao et al. | Facile hydrothermal synthesis of mesoporous nickel oxide/reduced graphene oxide composites for high performance electrochemical supercapacitor | |
| Liu et al. | Microwave-assisted hydrothermal synthesis of Mn3O4/reduced graphene oxide composites for high power supercapacitors | |
| Zhou et al. | High-performance supercapacitors using a nanoporous current collector made from super-aligned carbon nanotubes | |
| Zhang et al. | Supercapacitors based on reduced graphene oxide nanofibers supported Ni (OH) 2 nanoplates with enhanced electrochemical performance | |
| Saray et al. | Mesoporous MnNiCoO4@ MnO2 core-shell nanowire/nanosheet arrays on flexible carbon cloth for high-performance supercapacitors | |
| Li et al. | Rapid in situ growth of β-Ni (OH) 2 nanosheet arrays on nickel foam as an integrated electrode for supercapacitors exhibiting high energy density | |
| Vadiyar et al. | Binder-free chemical synthesis of ZnFe 2 O 4 thin films for asymmetric supercapacitor with improved performance | |
| Mao et al. | Synthesis of cobalt phosphate nanoflakes for high-performance flexible symmetric supercapacitors | |
| Sun et al. | Egg albumin-assisted hydrothermal synthesis of Co3O4 quasi-cubes as superior electrode material for supercapacitors with excellent performances | |
| Wang et al. | Fabrication and electrochemical investigation of MWO 4 (M= Co, Ni) nanoparticles as high-performance anode materials for lithium-ion batteries | |
| Xu et al. | Nickel oxide/expanded graphite nanocomposite electrodes for supercapacitor application | |
| Zhao et al. | In-situ synthesis of expanded graphite embedded with CuO nanospheres coated with carbon for supercapacitors | |
| Pan et al. | High-performance asymmetric supercapacitors based on core/shell cobalt oxide/carbon nanowire arrays with enhanced electrochemical energy storage | |
| Chang et al. | One-pot in-situ synthesis of Ni (OH) 2–NiFe 2 O 4 nanosheet arrays on nickel foam as binder-free electrodes for supercapacitors | |
| Wan et al. | Three-dimensional cotton-like nickel nanowire@ Ni–Co hydroxide nanosheet arrays as binder-free electrode for high-performance asymmetric supercapacitor | |
| Du et al. | Boosting the capacitance of NiCo2O4 hierarchical structures on nickel foam in supercapacitors | |
| Huang et al. | Facile preparation of W5O14 nanosheet arrays with large crystal channels as high-performance negative electrode for supercapacitor | |
| Basirun et al. | Nickel oxides/hydroxides-graphene as hybrid supercapattery nanocomposites for advanced charge storage materials–a review | |
| Zhou et al. | Mn3O4 nanoparticles on activated carbonitride by soft chemical method for symmetric coin cell supercapacitors | |
| Li et al. | Low Li ion diffusion barrier on low-crystalline FeOOH nanosheets and high performance of energy storage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WITN | Withdrawal due to no request for examination |