CN117747310A - Method for preparing nickel cobalt manganese selenide composite nano-structure electrode in situ based on carbon fiber wire - Google Patents
Method for preparing nickel cobalt manganese selenide composite nano-structure electrode in situ based on carbon fiber wire Download PDFInfo
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 58
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 58
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 239000002086 nanomaterial Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 22
- -1 nickel cobalt manganese selenide Chemical compound 0.000 title claims abstract description 18
- 238000004070 electrodeposition Methods 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- LAIZPRYFQUWUBN-UHFFFAOYSA-L nickel chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Ni+2] LAIZPRYFQUWUBN-UHFFFAOYSA-L 0.000 claims abstract description 13
- GFHNAMRJFCEERV-UHFFFAOYSA-L cobalt chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Co+2] GFHNAMRJFCEERV-UHFFFAOYSA-L 0.000 claims abstract description 12
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 12
- JPJALAQPGMAKDF-UHFFFAOYSA-N selenium dioxide Chemical compound O=[Se]=O JPJALAQPGMAKDF-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- VXJIMUZIBHBWBV-UHFFFAOYSA-M lithium;chloride;hydrate Chemical compound [Li+].O.[Cl-] VXJIMUZIBHBWBV-UHFFFAOYSA-M 0.000 claims abstract description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000004202 carbamide Substances 0.000 claims abstract description 6
- 229940082328 manganese acetate tetrahydrate Drugs 0.000 claims abstract description 6
- CESXSDZNZGSWSP-UHFFFAOYSA-L manganese(2+);diacetate;tetrahydrate Chemical compound O.O.O.O.[Mn+2].CC([O-])=O.CC([O-])=O CESXSDZNZGSWSP-UHFFFAOYSA-L 0.000 claims abstract description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 2
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims 1
- 238000000151 deposition Methods 0.000 abstract description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 13
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 10
- 238000001035 drying Methods 0.000 description 8
- 239000000835 fiber Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000000758 substrate Substances 0.000 description 8
- 239000002105 nanoparticle Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 6
- 238000000970 chrono-amperometry Methods 0.000 description 5
- 239000007772 electrode material Substances 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 5
- GTKRFUAGOKINCA-UHFFFAOYSA-M chlorosilver;silver Chemical compound [Ag].[Ag]Cl GTKRFUAGOKINCA-UHFFFAOYSA-M 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000013543 active substance Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910003266 NiCo Inorganic materials 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009954 braiding Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000001453 impedance spectrum Methods 0.000 description 2
- 239000011165 3D composite Substances 0.000 description 1
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 description 1
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 1
- 239000002659 electrodeposit Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- RPZHFKHTXCZXQV-UHFFFAOYSA-N mercury(i) oxide Chemical compound O1[Hg][Hg]1 RPZHFKHTXCZXQV-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002064 nanoplatelet Substances 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 150000003346 selenoethers Chemical class 0.000 description 1
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Abstract
The method for preparing the nickel cobalt manganese selenide composite nano-structure electrode based on the carbon fiber wire in situ comprises the following steps: dissolving nickel chloride hexahydrate, cobalt chloride hexahydrate and urea in water, placing the carbon fiber wire into the water, and performing hydrothermal reaction to obtain the carbon fiber wire growing with the needle-shaped NiCoLDH; dissolving nickel chloride hexahydrate, cobalt chloride hexahydrate, selenium dioxide, polyethylene glycol and lithium chloride monohydrate in water, placing carbon fiber wire with needle-shaped NiCoLDH grown therein, and performing electrochemical deposition to obtain NiCoSe grown therein 2 And nicolh composite nanostructured carbon fiber wire; dissolving manganese acetate tetrahydrate and anhydrous sodium sulfate in water, and growing NiCoSe 2 And placing and electrochemically depositing the carbon fiber wire with the NiCoLDH composite nano structure to obtain the NiCoLDH-NiCoSe grown with the NiCoLDH-NiCoSe 2 ‑MnO 2 The carbon fiber wire with the composite nano structure has excellent performance when used for super capacitors.
Description
Technical Field
The invention relates to the field of supercapacitors, in particular to a method for preparing a nickel cobalt manganese selenide composite nano-structure electrode based on carbon fiber wires in situ.
Background
With advances in science and technology and social developments, energy crisis issues have attracted more and more attention. In recent years, new energy devices such as perovskite solar cells, lithium-sulfur cells, supercapacitors and the like have been vigorously developed. Among them, supercapacitors are rapidly developed due to their rapid charge and discharge characteristics, high power density, long cycle life, and excellent reversibility.
Electrode active materials have been extensively studied as important factors affecting supercapacitor performance, e.g., mnO 2 ,NiCo 2 S 4 And NiCo 2 O 4 Such materials are widely used as electrode active materials due to their high faraday redox activity, abundant reserves of raw materials, and environmental friendliness. The nickel cobalt bimetallic compound exhibits excellent conductivity and specific capacitance due to synergistic effect, wherein NiCoSe 2 Materials have gained great attention due to the better conductivity of selenide. However, the traditional hydrothermal synthesis method has the problems of high time cost, poor repeatability and the like due to NiCoSe 2 The sample synthesis is not economical, and the single NiCoSe prepared by the existing electrochemical deposition method 2 The material loses the excellent cycle stability of the traditional hydrothermal samples.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for preparing a nickel cobalt manganese selenide composite nano-structure electrode based on carbon fiber wires in situ, which comprises the steps of electrochemically depositing NiCoSe 2 Redeposit of MnO after material 2 The specific capacitance and the cycling stability of the electrode are further improved through the composition of different chemical components and materials with different microstructures, so that the overall performance of the energy storage device is improved; in addition, unlike conventional foam metal sheet structural basesThe carbon fiber substrate adopted by the invention has excellent flexibility and braiding property, and the surface of the treated carbon fiber wire contains a large number of functional groups, so that the invention provides possibility for preparing the flexible and braiding fibrous supercapacitor by growing a stable structure on the surface of the fiber in situ.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in-situ preparation of composite nano structure on the surface of carbon fiber wire, wherein the composite nano structure comprises NiCoLDH nanoneedle and NiCoSe 2 Nanoparticles and MnO 2 A nanoplatelet structure. The composite structure not only increases the specific surface area and the active site of the electrode material, but also makes the connection between the electrode material and the substrate more compact. The material is used for preparing the efficient flexible and weaved fibrous super capacitor and has excellent performance.
The invention comprises the following parts:
1) Preparation of NiCoLDH nanoneedle structure by hydrothermal method
Nickel chloride hexahydrate, cobalt chloride hexahydrate and urea are dissolved in deionized water to prepare a reaction solution. Placing the cleaned carbon fiber line in a reaction kettle containing the reaction solution for ultrasonic treatment for 15 minutes, then reacting for several hours under a certain temperature condition, cooling to room temperature, washing a sample by deionized water, and drying to obtain the NiCoLDH nano needle structure.
2) Preparation of NiCoSe by electrochemical deposition 2 Nanoparticle structures
Nickel chloride hexahydrate, cobalt chloride hexahydrate, selenium dioxide, polyethylene glycol and lithium chloride monohydrate are dissolved in deionized water to prepare an electrodeposition solution a. Placing the carbon fiber wire with the needle-shaped NiCoLDH grown by hydrothermal method as a working electrode, a platinum sheet as a counter electrode and a silver-silver chloride electrode as a reference electrode into an electrodeposition solution a, and performing electrochemical deposition on an electrochemical workstation by using a chronoamperometry for a plurality of times to obtain NiCoSe 2 Washing carbon fiber wires with deionized water, and drying in an oven to obtain NiCoSe 2 And a composite nanostructure of nicolh.
3) Preparation by electrochemical depositionMnO 2 Nanosheet structure
Manganese acetate tetrahydrate and anhydrous sodium sulfate are dissolved in deionized water to prepare an electrodeposition solution b. Growing NiCoSe obtained by electrochemical deposition 2 And a carbon fiber wire with a NiCoLDH composite nano structure is used as a working electrode, a platinum sheet is used as a counter electrode, a silver-silver chloride electrode is used as a reference electrode to form a three-electrode system, the three-electrode system is placed into an electrodeposition solution b, and electrochemical deposition is carried out on an electrochemical workstation by using a time-voltage method to obtain MnO 2 Washing the carbon fiber wire with deionized water, and drying in an oven to obtain NiCoLDH-NiCoSe 2 -MnO 2 Composite nanostructures.
4) Sequentially performing NiCoSe by using electrochemical deposition method in a cyclic and alternating manner 2 And MnO 2 Deposition growth
The NiCoLDH-NiCoSe obtained above is mixed with 2 -MnO 2 The samples are sequentially repeatedly subjected to the step 2) and the step 3) under the same condition and electrochemically deposited for a plurality of times to obtain the NiCoLDH-NiCoSe with the best and most stable performance 2 -MnO 2 And (3) washing the sample with deionized water, and drying in an oven to obtain a final sample.
In the step 1), the carbon fiber wires are 4cm long and 200 mu m in diameter, and the cleaning is carried out by sequentially putting concentrated sulfuric acid, deionized water, acetone and absolute ethyl alcohol into each ultrasonic cleaning for 15 minutes.
In the step 1), the molar ratio of the nickel chloride hexahydrate to the cobalt chloride hexahydrate to the urea is 1:2 (10-15), preferably 1:2:13, wherein the molar concentration of the nickel chloride hexahydrate is 9-15 mmol/L, preferably 11.1mmol/L.
In the step 1), the hydrothermal reaction temperature is 100-150 ℃ and the reaction time is 6-12 hours; preferably 120℃for 8 hours.
In the step 2), the molar ratio of the nickel chloride hexahydrate to the cobalt chloride hexahydrate to the selenium dioxide in the electrodeposit solution a is 1:1 (1-3), preferably 1:1:2, wherein the molar concentration of the nickel chloride hexahydrate is 1-10 mmol/L, preferably 5mmol/L.
In the step 2), the mass percentage of polyethylene glycol and lithium chloride monohydrate in the electrodeposition solution a is 0.1% -1%, preferably 0.4% and 0.8%, respectively.
In the step 2), the voltage range of the electrochemical deposition by the chronoamperometry is-0.6 to-1V, preferably-0.8V; the time of the electrochemical deposition is 100 to 800 seconds, preferably 400 seconds.
In the step 3), the mass percentage of the manganese acetate tetrahydrate and the anhydrous sodium sulfate in the electrodeposition solution b is 1% -5%, preferably 2.5% and 1.5%, respectively.
In the step 3), the voltage range of the electrochemical deposition by the chronoamperometry is 0.6-1.2V, preferably 1V; the time of the electrochemical deposition is 100 to 800 seconds, preferably 200 seconds.
In step 4), the number of electrochemical deposition groups in the repeated step 2) and step 3) is in the range of 1 to 4 groups, preferably 3 groups.
The nickel cobalt manganese selenide composite nano-structure electrode prepared by the method is applied to super capacitors, particularly to flexible and braided fibrous super capacitors, and has excellent performance.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention prepares the NiCoSe on the carbon fiber line substrate by growing a microstructure on a flexible substrate in advance, then growing a high-activity material on the structure in situ, and finally doping a sizing agent with a stable structure 2 Nanoparticle, nicolh nanoneedle and MnO 2 A micron-band composite structure. The structure has unique morphology, increases the specific surface area of the active substance through a microstructure, and is composed of MnO 2 The active structure is tightly connected with the substrate, and the active structure is used as a working electrode material to be applied to a super capacitor, so that excellent electrochemical performance is shown. The carbon fiber wire substrate enables the super capacitor device to have flexible and weaveable characteristics, and provides a way for realizing flexible wearable energy devices. The method has the advantages of high repeatability, simple operation and the like, can be used for large-scale production, provides a universal method for preparing the three-dimensional composite structure material, and simultaneously provides a new idea for preparing novel composite materials and devices.
Drawings
Fig. 1 is an SEM (scanning electron microscope) front view (magnification of 1000 times) of a nicolh nanoneedle formed by hydrothermal reaction on the surface of a carbon fiber wire.
Fig. 2 is an SEM (scanning electron microscope) front view (magnification of 5000 times) of a nicolh nanoneedle formed by hydrothermal reaction on the surface of a carbon fiber wire.
FIG. 3 shows the electrochemical deposition of NiCoSe after the hydrothermal reaction of the carbon fiber wire surface to form a NiCoLDH nanoneedle 2 SEM (scanning electron microscope) front view of nanoparticles (magnification 2000).
FIG. 4 shows the electrochemical deposition of NiCoSe after hydrothermal formation of NiCoLDH nanoneedles on the surface of carbon fiber wire 2 Electrochemical deposition of MnO after nanoparticles 2 SEM (scanning electron microscope) front view (magnification 5000).
FIG. 5 is a view of NiCoLDH-NiCoSe 2 -MnO 2 The CV curves of the samples were measured in 3M KOH electrolyte at different scan speeds using a three electrode system. Wherein the CV curves are at a scanning speed of 10mV/s, 30mV/s, 50mV/s, 100mV/s, respectively from inside to outside. In the figure, the abscissa is voltage (V) and the ordinate is current density (mA/cm) 2 )。
FIG. 6 is a diagram of NiCoLDH-NiCoSe 2 -MnO 2 The sample was subjected to charge-discharge curves at different current densities in 3M KOH electrolyte using a three-electrode system. From left to right at 1mA/cm 2 、2mA/cm 2 And 4mA/cm 2 、8mA/cm 2 Charge-discharge curve at current density of (c). In the figure, the abscissa indicates time(s) and the ordinate indicates voltage (V).
FIG. 7 is a view of NiCoLDH-NiCoSe 2 -MnO 2 Nyquist electrochemical impedance spectroscopy image of the sample measured with a three electrode system in 3M KOH electrolyte. In the figure, the abscissa is the real part (Ω) and the ordinate is the negative number (Ω) of the imaginary part of the impedance.
FIG. 8 is a view of NiCoLDH-NiCoSe 2 -MnO 2 XRD characterization of the samples. In the figure, the abscissa is 2 times the diffraction angle (°), and the ordinate is the relative intensity of the diffraction peak (a.u.); the symbol marks are MnO 2 The XRD pattern of (c) corresponds to the peak,the symbol mark is NiCoSe 2 The XRD pattern of (a) corresponds to the peak. The vertical line is the peak position corresponding to the standard PDF card.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear and obvious, the invention is further described in detail below with reference to the accompanying drawings and embodiments.
A method for preparing a nickel cobalt manganese selenide composite nano-structure electrode in situ based on carbon fiber wires.
(1) The carbon fiber wire with the diameter of 200 mu M and the length of 4cm is sequentially put into 9M concentrated sulfuric acid, deionized water, acetone and absolute ethyl alcohol for ultrasonic cleaning for 15 minutes, and then dried into the hydrophilic clean carbon fiber wire through an oven.
(2) A hydrothermal reaction solution was prepared by dissolving 0.5g of nickel chloride hexahydrate, 0.1g of cobalt chloride hexahydrate, and 0.8g of urea in 180ml of deionized water. And (3) placing the dried carbon fiber wire in a reaction kettle containing the reaction solution for ultrasonic treatment for 15 minutes, reacting for 8 hours at 120 ℃, naturally cooling, taking out a sample, flushing with deionized water, and drying in a 60 ℃ oven to obtain the NiCoLDH nano needle structure growing on the carbon fiber wire in situ.
(3) 237.7mg of nickel chloride hexahydrate, 237.9mg of cobalt chloride hexahydrate, 222mg of selenium dioxide, 100mg of polyethylene glycol and 100mg of lithium chloride monohydrate (the lithium chloride monohydrate is used as auxiliary conductive ions for electrochemical deposition, and the whole electrochemical deposition effect is more obvious) are dissolved in 50ml of deionized water to prepare an electrodeposition solution a. Putting the carbon fiber wire with the needle-shaped NiCoLDH grown in a hydrothermal manner as a working electrode, a platinum sheet as a counter electrode and a silver-silver chloride electrode as a reference electrode into an electrodeposition solution a, and performing electrochemical deposition for 400 seconds on an electrochemical workstation by using a chronoamperometry at-0.8V voltage to obtain the NiCoSe grown on the NiCoLDH nanoneedle microstructure in situ 2 Washing carbon fiber wires with deionized water, and drying in an oven to obtain NiCoSe 2 And a composite nanostructure of nicolh.
(4) An electrodeposition solution b was prepared by dissolving 4.9g of manganese acetate tetrahydrate and 2.84g of anhydrous sodium sulfate in 200ml of deionized water. Growing NiCoSe obtained by electrochemical deposition 2 And a carbon fiber wire with a NiCoLDH composite nano structure is used as a working electrode, a platinum sheet is used as a counter electrode, a silver-silver chloride electrode is used as a reference electrode to form a three-electrode system, the three-electrode system is put into an electrodeposition solution b, and a 1V voltage is applied on an electrochemical workstation by a chronoamperometry electrochemical deposition method for 200 seconds to obtain MnO grown on the previous composite structure in situ 2 Washing the carbon fiber wire with deionized water, and drying in an oven to obtain preliminary NiCoLDH-NiCoSe 2 -MnO 2 Composite nanostructured fiber electrodes.
(5) Sequentially subjecting the preliminary NiCoLDH-NiCoSe to the same conditions 2 -MnO 2 The composite nano-structure fiber electrode is subjected to the deposition treatment in the electrodeposition solution a and the electrodeposition solution b for two times, so that the structure is firmly strengthened, and the final NiCoLDH-NiCoSe is obtained 2 -MnO 2 Composite nanostructured fiber electrodes.
The characterization test of the nickel cobalt manganese selenide composite nanostructure electrode prepared in situ based on the carbon fiber line is as follows:
(1) Drying the prepared composite electrode, and observing the surface active material structure of the carbon fiber line by using an SEM (scanning electron microscope), wherein the structure is shown in figures 1 and 2, and is prepared by a NiCoLDH nano needle structure in the step (1) by using a hydrothermal method; as shown in FIG. 3, in step (2), niCoSe is prepared by electrochemical deposition 2 A nanoparticle structure; as shown in FIG. 4, in step (4), niCoLDH-NiCoSe is prepared by cyclic electrochemical deposition 2 -MnO 2 Composite nanostructures. From SEM images, it can be observed that the composite nanostructure uniformly grows on the carbon fiber wire by hydrothermal and electrochemical in-situ deposition, and the substrate of the nanoneedle structure as a three-dimensional nanostructure increases niconse 2 The area of the nano particles for adhesion growth greatly improves the specific surface area of the active substance, and the band-shaped MnO on the post electrodeposition growth 2 The more firmly bonding of the active substance to the substrate improves the cycling stability.
(2) The prepared NiCoLDH-NiCoSe 2 -MnO 2 The composite nano-structure fiber electrode is used as a working electrode, a platinum sheet is used as a counter electrode, a mercury-mercury oxide electrode is used as a reference electrode to form a three-electrode system, and 3M potassium hydroxide solution is used as electrolyte for electrochemical performance test. As shown in FIG. 5, is NiCoLDH-NiCoSe 2 -MnO 2 CV curves for samples at scan rates of 10mV/s, 30mV/s, 50mV/s, 100 mV/s; as shown in FIG. 6, the sample was at 1mA/cm 2 、2mA/cm 2 、4mA/cm 2 、8mA/cm 2 A charge-discharge curve at a current density of (3); as shown in fig. 7, a nyquist electrochemical impedance spectrum image of the sample measured in 3M KOH electrolyte is shown. The specific capacitance (Specific capacitance) value of the composite fiber electrode can reach 902.4mF/cm through the charge-discharge curve data 2 The coulomb efficiency reached 92.8%, and it was observed from the nyquist electrochemical impedance spectrum image that the charge transfer resistance of the composite electrode was about 9.4 Ω (intersection of curve and Z' axis) and excellent ion diffusion rate (higher ion diffusion rate as the slope of the low frequency region was higher), which was very competitive in the fiber wire electrode field with a diameter ranging from 200 to 300 μm.
(3) Obtaining NiCoLDH-NiCoSe by ultrasonic means 2 -MnO 2 Powder active material on composite nanostructure fiber electrode was tested for nicolh-niconse using XRD (X-ray diffractometer) at an angle ranging from 20 ° to 70 ° 2 -MnO 2 XRD pattern of the composite nanomaterial. As shown in FIG. 8, niCoSe appears at 33.3 °, 44.7 °, 50.6 ° 2 Major three strong characteristic peaks; mnO occurs at 28.7 °, 41.0 °, 42.9 °, 46.4 °, 56.8 °, 59.4 ° 2 A major strong characteristic peak.
Claims (10)
1. The method for preparing the nickel cobalt manganese selenide composite nano-structure electrode based on the carbon fiber wire in situ is characterized by comprising the following steps of:
1) Dissolving nickel chloride hexahydrate, cobalt chloride hexahydrate and urea in water to prepare a reaction solution, placing a carbon fiber wire in the reaction solution for ultrasonic treatment, and performing hydrothermal reaction to obtain the carbon fiber wire growing with needle-shaped NiCoLDH;
2) Will be hexahydratedDissolving nickel chloride, cobalt chloride hexahydrate, selenium dioxide, polyethylene glycol and lithium chloride monohydrate in water to prepare an electrodeposition solution a, putting the carbon fiber wire with the needle-shaped NiCoLDH prepared in the step 1) into the electrodeposition solution a, and performing electrochemical deposition to obtain the carbon fiber wire with the needle-shaped NiCoSe 2 And nicolh composite nanostructured carbon fiber wire;
3) Dissolving manganese acetate tetrahydrate and anhydrous sodium sulfate in water to prepare electrodeposition solution b, and growing NiCoSe prepared in the step 2) 2 And a carbon fiber wire with a NiCoLDH composite nano structure is put into an electrodeposition solution b, and is subjected to electrochemical deposition to obtain a NiCoLDH-NiCoSe grown 2 -MnO 2 Carbon fiber wires of composite nanostructures.
2. The method for in-situ preparation of nickel cobalt manganese selenide composite nanostructure electrode based on carbon fiber wire according to claim 1, further comprising the steps of:
4) Growing NiCoLDH-NiCoSe obtained in the step 3) 2 -MnO 2 The step 2) and the step 3) are sequentially repeated on the carbon fiber line with the composite nano structure, and the stable NiCoLDH-NiCoSe growing on the carbon fiber line is obtained by electrochemical deposition for a plurality of times 2 -MnO 2 Carbon fiber wires of composite nanostructures.
3. The method for preparing the nickel-cobalt-manganese selenide composite nano-structure electrode based on the carbon fiber wire in situ as claimed in claim 1, wherein the method comprises the following steps: in the step 1), the carbon fiber wire is cleaned by sequentially placing concentrated sulfuric acid, deionized water, acetone and absolute ethyl alcohol into the cleaned carbon fiber wire for ultrasonic cleaning.
4. The method for preparing the nickel-cobalt-manganese selenide composite nano-structure electrode based on the carbon fiber wire in situ as claimed in claim 1, wherein the method comprises the following steps: in the step 1), the mol ratio of the nickel chloride hexahydrate to the cobalt chloride hexahydrate to the urea is 1:2 (10-15).
5. The method for preparing the nickel-cobalt-manganese selenide composite nano-structure electrode based on the carbon fiber wire in situ as claimed in claim 1, wherein the method comprises the following steps: in the step 1), the temperature of the hydrothermal reaction is 100-150 ℃ and the reaction time is 6-12 hours.
6. The method for preparing the nickel-cobalt-manganese selenide composite nano-structure electrode based on the carbon fiber wire in situ as claimed in claim 1, wherein the method comprises the following steps: in the step 2), the molar ratio of the nickel chloride hexahydrate to the cobalt chloride hexahydrate to the selenium dioxide in the electrodeposition solution a is 1:1 (1-3).
7. The method for preparing the nickel-cobalt-manganese selenide composite nano-structure electrode based on the carbon fiber wire in situ as claimed in claim 1, wherein the method comprises the following steps: in the step 2), the mass percentages of polyethylene glycol and lithium chloride monohydrate in the electrodeposition solution a are respectively 0.1% -1%; in the step 3), the mass percentage of the manganese acetate tetrahydrate and the anhydrous sodium sulfate in the electrodeposition solution b is 1-5%.
8. The method for preparing the nickel-cobalt-manganese selenide composite nano-structure electrode based on the carbon fiber wire in situ as claimed in claim 1, wherein the method comprises the following steps: in the step 2), the voltage range during electrochemical deposition is-0.6 to-1V, and the time of electrochemical deposition is 100-800 seconds; in the step 3), the voltage range during electrochemical deposition is 0.6-1.2V, and the time of electrochemical deposition is 100-800 seconds.
9. The nickel cobalt manganese selenide composite nano structure electrode is characterized in that: a method according to any one of claims 1 to 8.
10. The use of a nickel cobalt manganese selenide composite nanostructure electrode according to claim 9, wherein: the method is applied to super capacitors, and is especially used for preparing flexible and braided fibrous super capacitors.
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