42 results about "Pseudocapacitance" patented technology

The invention discloses a preparation method and application of three-dimensional intercalation multidirectional conductive MXene-based aerogel, and relates to the technical field of advanced electrochemical energy storage materials and devices. According to the MXene / conductive polymer and nanofiber composite aerogel developed by the invention, the two-dimensional conductive material, the pseudocapacitance polymer and the high-performance nanofiber are integrated in a three-in-one manner, so that collaborative optimization of conductivity, the number of active sites and structural stability is realized, and inherent defects of a single-component material are fundamentally avoided; and a universal solution is provided for solving the industrial problem of unbalanced performance of the electrode material.

The invention provides a design and application of a power type electrolyte of a double-electric-layer capacitor, and the electrolyte comprises an organic solvent, an electrolyte salt and an additive. Wherein the additive has a general formula structure as shown in Figure 1: the additive has a strong electronegativity part and a strong electropositivity part, a proper chain length is adjusted between the two parts, so that the whole molecular size of the additive can be matched with the micropore diameter of the activated carbon, adsorption and desorption are facilitated, bond breaking is easy, and when part of pseudocapacitance is contributed through oxidation bond breaking, the performance of the additive is improved. According to the present invention, the positive electrode and the negative electrode can be preferentially adsorbed to the positive electrode and the negative electrode so as to form the regulation and the low polarity and high density interface, such that the ion association of the salt ions at the double electrode layer is reduced, the reduction of the liquid phase transmission internal resistance is achieved, the excellent power performance is further represented, and the capacity retention rate in the 125A large-rate cycle (the conventional current is 25A) is increased to 90.1% from 76.3%. In addition, the silicon-containing part formed by broken bonds can also synergistically remove HF generated by hydrolysis of salt anions BF4 <-> in the electrolyte, passivate Al foil and reduce the contact internal resistance of the aluminum conducting bar. The configuration of the additive introduced into the electrolyte is shown in the specification.

The invention provides an electro-adsorption desalting device and method based on the synergistic effect of double electric layers and a pseudocapacitor, the device comprises a shell, a cathode plate, an anode plate and a stabilized voltage direct current power supply, and the shell is provided with a water inlet and a water outlet; the cathode plates and the anode plates are detachably connected to the interior of the shell, the multiple cathode plates and the multiple anode plates are arranged in a staggered mode, the surfaces of the anode plates are coated with anode adsorption materials, the anode adsorption materials are formed by compounding carbon-series materials and pseudocapacitance materials with anion storage capacity, the surfaces of the cathode plates are coated with cathode adsorption materials, and the cathode adsorption materials are formed by compounding carbon-series materials and pseudocapacitance materials with anion storage capacity. The cathode adsorption material is formed by compounding a carbon-series material and a pseudocapacitance material with cation storage capacity; and the voltage-stabilized direct-current power supply is electrically connected with the cathode plate and the anode plate respectively. The desalting efficiency and the adsorption capacity of the water sample to be treated can be improved, the operation is simple, and the practicability is relatively high.

The preparation method comprises the following steps: mixing cobalt acetate, a modified ligand, a modified additive and DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding deionized water and a modified filler, carrying out ultrasonic treatment, carrying out heating reaction, carrying out centrifugation to remove a supernatant, and carrying out drying treatment to prepare the rapid-charge high-capacity artificial graphite negative electrode material, when the cobalt acetate, the modified ligand, the modified additive and the modified filler are subjected to blending reaction, carboxyl on the modified ligand and carboxyl on the modified additive can form coordinate bonds with cobalt ions of the cobalt acetate, then a cobalt metal organic framework is formed on the surface of the modified filler, and a fluorine element in the modified ligand can react with lithium to form lithium fluoride; electron penetration is effectively blocked, and side reactions are reduced; the lithium ion diffusion energy barrier is reduced, rapid charging and discharging are achieved, pyridine groups on the surface of the modified filler can provide lone pair electrons and serve as binding sites of lithium ions, pseudocapacitance is formed, and then the capacity is increased.

The invention discloses a method for preparing a carbon nanotube-based composite microsphere energy storage material through continuous flow. The invention discloses a preparation method for constructing a microspherical composite carbon nanotube supercapacitor material based on microfluidics, and belongs to the technical field of supercapacitors. The method comprises the following steps: acidifying carbon nanotubes to improve dispersibility; the preparation method comprises the following steps: by taking dimethyl silicone oil as an oil phase and acidified carbon nanotube dispersion liquid as a water phase, regulating and controlling a flow rate ratio through a microfluidic technology, and preparing carbon nanotube microspheres with uniform sizes; performing high-temperature pyrolysis to obtain a conductive microsphere framework; the MF-CNTs (at) ZIF-8 composite material is obtained by taking the MF-CNTs (at) ZIF-8 as a carrier, performing in-situ growth of ZIF-8 through a solution impregnation method and then performing secondary pyrolysis. According to the method, accurate and controllable preparation of the carbon nanotube microspheres is realized, and a conductive network of the carbon nanotubes and high specific surface area and pseudocapacitance activity of the ZIF-8 are synergistically exerted by combining in-situ compounding of the ZIF-8. The specific capacitance of the prepared material in a 6 M KOH electrolyte reaches 356.2 F.g <-1 >, the rate capability is excellent, and the capacity retention rate is 81.6% after 3000 cycles. The method has the advantages of controllable steps, mild conditions, low cost, easiness in continuous production and large-scale application potential.

The invention discloses a double-shell high-nickel NCM composite positive electrode material and a preparation method thereof, and the preparation method comprises the following steps: drying and screening high-nickel NCM particles, depositing an Nb2O5 shell layer by using a doped niobium source composite precursor and an oxidizing agent through atomic layer deposition to obtain a precursor material, and depositing an La2O3 shell layer by using a lanthanide series metal source precursor and an oxidizing agent to obtain the double-shell high-nickel NCM composite positive electrode material. And finally performing inert atmosphere heat treatment to obtain a product. According to the material, a double-atomic-layer deposition structure of the inner layer Nb2O5 and the outer layer La2O3 is adopted, a synergistic effect is achieved through chemical bonding and the like, the outer layer La2O3 and Nb2O5 are coordinated to construct a compact interface, and electrolyte permeation is prevented; the crystal lattice matching performance is good, and the interface stress is relieved. The Nb < 5 + > / Nb < 4 + > provides a pseudocapacitance channel, the La2O3 oxygen vacancy promotes Li < + > adsorption, and ion conduction and rate performance are improved. In mechanics and thermology, the double layers share stress, crack is inhibited, electrolyte is isolated at high temperature, and oxygen release is delayed. The material remarkably reduces impedance increase and improves the long-cycle capacity retention rate.

The invention belongs to the technical field of supercapacitors and ion diodes, and discloses a quantum-capacitor-based supercapacitor diode and a preparation method thereof.The quantum-capacitor-based supercapacitor diode takes a quantum capacitor material as a working electrode of an active material, and the quantum capacitor material is a semiconductor material; a exists, so that the difference between the average quantum capacitance when the quantum capacitor material is the positive electrode and the applied voltage is [0V, + aV] and the average quantum capacitance when the quantum capacitor material is the negative electrode and the applied voltage is [-aV, 0V] is at least two orders of magnitude; wherein 0.3 < = a < = 2. The quantum capacitor-based supercapacitor diode is based on a quantum capacitor material, the one-way conductivity of the diode is successfully integrated into the supercapacitor by using the difference between positive and negative quantum capacitors, and the diode can operate in any electrolyte system without depending on pseudocapacitance reaction, so that the quantum capacitor-based supercapacitor diode is suitable for large-scale production. The method can be particularly applied to the fields of ion logic circuits, brain-computer interfaces, humanoid brain calculation and the like.

The invention relates to the technical field of high-performance thin film energy storage electrodes, and particularly discloses a preparation method of a high-performance graphene-based electrochemical energy storage electrode material. Comprising the following steps: taking ammonia water and deionized water to prepare a mixed solution, adding rhein, uniformly mixing, dipping a graphene oxide (GO) film into the solution, and carrying out hydrothermal reaction to obtain the Rhein (at) RGO film electrode material. The Rhein (at) RGO thin film with a porous structure is obtained by loading the Rhein (at) RGO thin film onto RGO through a simple hydrothermal method and a non-covalent modification method. And the RGO and the rhein generate a synergistic effect. The graphene skeleton of the Rhein (at) RGO can provide a channel for electrons to promote rapid transmission of the electrons, so that good rate capability is maintained, and the rhein can provide extra pseudocapacitance for the electrode through an oxidation-reduction reaction. The Rhein (at) RGO thin film electrode maintains good rate capability, and meanwhile, the specific capacitance of the material is greatly improved.

The invention discloses a copper complex composite carbon electrochemical material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The flexible sulfur-containing carboxylic acid ligand and the transition metal are compounded through a hydrothermal or solvothermal method to form the copper complex with a potential pore structure, the copper complex / C composite carbon electrochemical energy storage material is further prepared, and the pseudocapacitance contribution rate of the copper complex / carbon composite material can reach 81% or above. The prepared material is stable in structure and keeps good thermal stability at the temperature of 200 DEG C or below.

The invention belongs to the technical field of activated carbon, and particularly relates to a preparation method of high-specific-capacitance activated carbon for a supercapacitor. The preparation method comprises the following steps: carbonizing coconut shells, crushing, uniformly mixing the obtained carbonized crushed material with an alkali activator, pre-activating, and grinding to obtain a pre-activated material; the pre-activation condition is inert atmosphere, the temperature is 450-550 DEG C, and the temperature is kept for 0.5-1.5 h; the preparation method comprises the following steps: dissolving phenolated lignin in alkali liquor, adding pyridine diamine and a formaldehyde solution, uniformly mixing and reacting to obtain phenolated lignin modified amine; adding phenolated lignin modified amine, dialdehyde and a catalyst into an organic solvent, uniformly mixing, adding the pre-activated material, performing ultrasonic dispersion, and performing heating reflux reaction to obtain a coated modified pre-activated material; and activating the coated modified pre-activated material, pickling, washing and drying to obtain the high-specific-capacitance activated carbon for the supercapacitor. The phenolated lignin modified amine and the dialdehyde are cured and crosslinked on the inner wall and the surface of the pores of the pre-activated material, and the nitrogen-doped mesoporous carbon is formed through activation, so that the situation that nitrogen functional groups are introduced into pseudocapacitance due to excessive etching of the initial pores of the pre-activated material is avoided.

The invention belongs to the technical field of battery materials, and particularly relates to a composite positive electrode material, a preparation method thereof, a positive plate and a secondary battery. The composite positive electrode material comprises an N-doped MXene carrier and a positive electrode active material grown in the N-doped MXene carrier in situ, the positive electrode active material comprises metal element doped lithium iron phosphate, and the positive electrode active material has a rice-grain-like morphology structure. In the composite positive electrode material, N-doped MXene serves as a three-dimensional conductive skeleton, pyridine nitrogen and pyrrole nitrogen provide defects due to doping of N atoms, and N-doped MXene serves as a lithium ion adsorption site to improve pseudocapacitance contribution. According to the lithium iron phosphate, grains are refined through metal doping, the b-axis and unit cell volume of the lithium iron phosphate are shortened, and Li-O bonds are increased, so that a lithium ion diffusion channel is shortened, and the diffusion rate is increased. Due to the rice-like morphology structure, the diffusion distance of lithium ions in the positive electrode active material is greatly shortened, and the rate capability is improved.

The invention belongs to the technical field of electrode materials, and particularly relates to a FePO4-coated MHM composite material and a preparation method and application thereof. In order to improve the stability and selectivity of a CDI electrode material, a pseudocapacitance material FePO4 is combined with a double-electrode-layer material MHM (MXene of a three-dimensional hollow microsphere structure) with a pseudocapacitance attribute, the FePO4-MHM composite material is successfully prepared, FePO4 particles are uniformly distributed on the surfaces of MXene-based hollow microspheres, a three-dimensional structure with a high specific surface area and rich ion adsorption sites is formed, and the stability and selectivity of the CDI electrode material are improved. The FePO4-coated MHM composite material also shows excellent desalination performance in a CDI device.

The invention discloses an amino-modified MXene electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: reacting a mixed solution containing an amino source and a Ti3C2Tx nanosheet, and performing ultrasonic treatment to obtain amino modified Ti3C2Tx; and then compounding the amino-modified Ti < 3 > C < 2 > T < x > with a conductive substrate to obtain the amino-modified MXene electrode. The amino-modified MXene electrode has the advantages that the surface polarization effect is enhanced, the coulomb adsorption capacity of the amino-modified MXene electrode on ions is improved, additional charge storage sites are provided, the enhancement of the Faraday pseudocapacitance effect is promoted, and the amino-modified MXene shows higher charge storage capacity in a CDI system due to the effects, so that the removal efficiency of Cu < 2 + > is obviously improved. After phthalocyanine is further modified, CO2 reduction reaction can be efficiently driven, and particularly, good formic acid generation capacity is shown in a low-potential interval.

The invention belongs to the technical field of lithium extraction, and particularly relates to a coated material and a preparation method thereof, a composite electrode and application thereof, and a capacitive deionization lithium extraction system and method. According to the method, a retired NCM positive electrode material is subjected to surface LTO modification to form an NCM (LTO) coated material, then the NCM (LTO) coated material is applied to a capacitive deionization lithium extraction system, and directional enrichment of Li < + > in the salt lake brine is realized through electrochemical driving. According to the technical scheme, material reutilization and lithium extraction functionalization are both considered, on the microstructure, the LTO layer provides stable Ti-O-Li key sites and electrochemical pseudocapacitance behaviors, and a selective lithium intercalation interface is formed; in a macroscopic process, a capacitive deionization system can realize reversible adsorption and desorption through potential control; and in the aspect of resource circulation, direct high-value utilization of retired battery materials and green development of salt lake lithium resources are realized.

The invention relates to an n-type conductive polymer-based supercapacitor. The n-type conductive polymer-based supercapacitor sequentially comprises a positive electrode, an electrolyte layer and a negative electrode, wherein the structures of the positive electrode and the negative electrode are n-type conductive polymer poly (benzodifuran diketone) (PBFDO) layers and current collector layers; the electrolyte layer comprises a water-based diaphragm and an electrolyte for infiltrating the water-based diaphragm, and an electrolyte material is selected from one or more of neutral salt, hydroquinone and derivatives thereof. According to the invention, the n-type conductive polymer PBFDO is applied to construction of a supercapacitor electrode material, and the prepared electrode shows excellent electrochemical performance in a three-electrode system. The hydroquinone and the derivative thereof are additionally added into the neutral salt electrolyte, so that the pseudocapacitance contribution of a system can be remarkably improved through reversible oxidation reduction of the hydroquinone, the conductivity stability of an electrode is enhanced through the intermolecular action between the hydroquinone and PBFDO, and the cycle life is prolonged.

The invention discloses a method for preparing a polypyrrole (PPy) aerogel supercapacitor electrode material through ultrasonic-assisted liquid-phase in-situ oxidative polymerization, and belongs to the technical field of energy storage device electrode materials. The PPy aerogel is prepared by adopting an ultrasonic-assisted means, taking ferric chloride as an oxidizing agent, adding a pyrrole monomer into a low-temperature ferric chloride solution, and carrying out liquid-phase in-situ oxidative polymerization. The method is mild in preparation condition, simple in process, controllable in process, low in energy consumption and free of additional additives and complex devices, and is an environment-friendly preparation technology. According to the technology, a pyrrole monomer is promoted to be uniformly dispersed and polymerized in a solution to form compact and uniform PPy particles by utilizing the shearing force and cavitation effect of ultrasonic waves, so that aerogel with a three-dimensional network structure is constructed; the obtained PPy aerogel electrode with the integrated three-dimensional network structure has abundant electrochemical reaction active sites, is beneficial to full play of pseudocapacitance, and is expected to be applied and popularized in the field of supercapacitor electrode materials.

The invention discloses an artificial lorenus kettle electric field sensor and a preparation and application method thereof.The artificial lorenus kettle electric field sensor comprises an upper electrode, a lorenus kettle array, a lower electrode and a metal current collector, and the lorenus kettle array comprises a filling body and a plurality of lorenus kettles in the filling body; each lorenus kettle comprises a kettle tube and a kettle belly which are communicated with each other as well as a lower electrode and a metal current collector which are positioned at the bottom of the kettle belly, the kettle tube and the kettle belly are filled with conductive gel, and the conductive gel is electronegative so as to be used for attracting and gathering positive ions in seawater and transferring and transporting the positive ions to the lower electrode; and the lower electrode and the cations are subjected to pseudocapacitance reaction, so that the output capacitance value is changed to respond to the change of an external electric field. The invention aims to realize underwater weak electric field sensing, solve the difficulty in improving the resolution of the existing mobile electric field sensor, endow an underwater mobile platform with nV / m electric field sensing capability, and provide key technical support for supporting and constructing large-range mobile ocean weak electric field continuous detection.

The invention relates to the technical field of sensors, in particular to a high-sensitivity flexible pressure sensor. The high-sensitivity flexible pressure sensor sequentially comprises a first substrate layer, a first electrode layer, a first thin film layer, a supporting structure layer, a second thin film layer, a second electrode layer and a second packaging layer from top to bottom, a cavity layer is formed in the supporting structure layer, and the height of the cavity layer is the same as that of the supporting structure layer. A microstructure ion electron film layer is arranged on the surface, close to the supporting structure layer, of the second film layer; the first thin film layer and / or the second thin film layer are / is made of an MXene / GO composite material. According to the flexible pressure sensor, the MXene composite material film layer is inserted between the gold electrode and the dielectric layer composed of the cavity / ion electronic film, a pseudocapacitance effect is generated, the charge variation after the flexible pressure sensor is stressed is increased, and the electric response sensitivity of the pressure sensor is improved.

This invention discloses a 3D coral-like FeS₂ / MoS₂ core-shell heterojunction anode material and its preparation method. Through a hydrothermal method combined with a sulfidation process, ultrathin, flexible MoS₂ nanosheets are uniformly wrapped around the surface of a one-dimensional FeS₂ framework, forming a self-supporting core-shell network structure. Utilizing the significant work function difference between the two (5.653 eV for FeS₂ and 3.97 eV for MoS₂), a strong built-in electric field pointing from MoS₂ to FeS₂ is introduced at the interface. This structure significantly improves the material's interfacial electronic conductivity (inducing metallic characteristics at the interface, with a pseudocapacitance contribution rate as high as 65% at 1.0 mV / s) and lithium-ion diffusion kinetics (reducing the diffusion activation barrier to approximately 1.0 eV). After 200 cycles at 0.1 A·g⁻¹, the material maintains a reversible specific capacity of up to 1600 mAh·g⁻¹ and the charge transfer resistance is reduced to 15.2 Ω. This effectively solves the problems of severe volume expansion, serious polysulfide shuttle, and slow reaction kinetics in traditional transition metal sulfide anode materials during the conversion reaction.

The invention provides a high-conductivity capacitor carbon composite electrode material and a preparation method thereof. The high-conductivity capacitor carbon composite electrode material is obtained by in-situ polymerization of a conductive polymer in the prepared MOF metal frame. Activated carbon provides wide double-electrode-layer capacity, conducting polymers are polymerized in situ in an MOF metal frame, rapid pseudocapacitance sites are provided, the active carbon and the conducting polymers complement each other to improve the total specific volume, graphene serves as a conductive bridge, an MOF inner / polymer phase and the activated carbon can be rapidly connected, the internal resistance is reduced, and the rate performance is improved. And the conductive polymer polymerized in the holes can bond the particles, so that the contact resistance in the electrode is reduced, the powder layer falling is reduced, and the cycle life is further prolonged.

The invention discloses a preparation method of a carboxylated polythiophene / N, P co-doped mesoporous carbon bowl / alpha-manganese dioxide integrated membrane electrode, and relates to the field of chemical separation, sucrose is used as a carbon source, P123-sodium oleate is used as a template agent, and triethylene tetramine and phytic acid are respectively used as a nitrogen source and a phosphorus source to prepare an N, P co-doped mesoporous carbon bowl; compounding the N, P co-doped mesoporous carbon bowl with alpha-manganese dioxide with high pseudocapacitance, and modifying a carboxylated polythiophene film on the surface of the mesoporous carbon bowl / alpha-manganese dioxide electrode by electrochemical deposition to serve as an MCDI ion exchange membrane, so as to construct a carboxylated polythiophene / N, P co-doped mesoporous carbon bowl / alpha-manganese dioxide integrated membrane electrode. According to the present invention, the electrode specific capacitance is substantially improved, the hydrophilicity and the membrane selective permeability are improved, such that the uranium-containing wastewater treatment effect of MCDI is significantly improved, the advantages of easy preparation, high specific volume and high adsorption capacity are provided, the uranium removal rate reaches 82%, and the uranium electro-adsorption capacity is 410 mg / g.

The invention relates to a flexible paper-based supercapacitor, and the supercapacitor sequentially comprises the following structures from bottom to top: a positive electrode, an electrolyte layer, and a negative electrode. Wherein the positive electrode sequentially comprises a carbon nanotube paper layer and a poly (benzodifuran diketone)-activated carbon composite layer from bottom to top; the negative electrode sequentially comprises a poly (benzodifuran diketone)-activated carbon composite layer and a carbon nanotube paper layer from bottom to top; the electrolyte layer comprises a water-based diaphragm; and the electrolyte layer is completely divided into an upper part and a lower part by the water-based diaphragm. The carbon nanotubes are introduced into the cellulose paper, so that the cellulose paper has relatively high conductivity and excellent mechanical flexibility, and can be used as a substrate of a self-supporting electrode to load an active substance; the PBFDO and the active carbon (AC) are compounded to form a double-electrode layer-pseudocapacitance synergistic energy storage system, so that the electrochemical performance of the device is remarkably improved. The strategy breaks through the bottleneck of electrochemical performance and mechanical flexibility of the flexible supercapacitor, and has a wide prospect.

The invention discloses a composite thin-layer negative electrode material with surface defects and a preparation method of the composite thin-layer negative electrode material. According to the preparation method, fluorine is doped into NiMoO4 crystal lattices by combining hydrothermal synthesis with a nitrogen annealing process to form Ni-F bonds and NiF2 phases, so that the electron conductivity (band gap approaches to zero) and the lithium ion diffusion rate (the diffusion coefficient reaches 5.34 * 10 <-13 > cm < 2 > s <-1 >) of the material are remarkably improved. The first discharge capacity of the material under 0.1 Ag <-1 > reaches 1852 mAh g <-1 >, the capacity is kept at 1050 mAh g <-1 > after 200 times of circulation, the pseudocapacitance contribution accounts for 80%, and the problems that traditional nickel molybdate is poor in conductivity and rapid in circulation attenuation are solved. The invention provides a new strategy for development of a high-performance lithium ion battery anode material.

The invention relates to the technical field of electrode material preparation, in particular to a molybdenum-based transition metal oxide nanosheet electrode material, a preparation method and application, and the method comprises the following steps: preparing a precursor solution by using Ni salt, Co salt, an oxidation-state compound of Mo and urea; soaking the foamed nickel in the precursor solution, and carrying out hydrothermal reaction to obtain a prefabricated electrode material; and finally, calcining the prefabricated electrode material to obtain the molybdenum-based transition metal oxide nanosheet electrode material with a high specific surface area, so that electrochemical active sites can be fully exposed, and the specific capacity is remarkably improved. Due to the introduction of Ni and Co, the conductivity of the material is improved, and the reversibility of pseudocapacitance reaction is enhanced; cH4N2O serves as a nitrogen source, effective nitrogen doping in material lattices can be achieved, the electron conduction rate is increased, charge transfer loss is reduced, the interface bonding force between the material and a foamed nickel substrate is enhanced, the cycling stability is greatly improved, and the problem that a molybdenum-based transition metal oxide nanosheet electrode material is poor in energy storage performance is solved.

The invention discloses a preparation method of manganese dioxide-nitrogen doped carbon quantum dot electrode slurry. Performing hydrothermal reaction on the carbon source substance and the nitrogen source substance; carrying out solid-liquid separation on the hydrothermal product, and removing a precipitation product to obtain a nitrogen-doped carbon quantum dot suspension; dropwise adding a KMnO4 aqueous solution into the NCQD suspension, enabling MnO4 <-> to fully react with functional groups on the surface of the NCQD, and generating a reduction product MnO2 on the surface of the NCQD to obtain a MnO2-coated NCQD suspension; and adding a KOH aqueous solution into the MnO2 (at) NCQD slurry to obtain the MnO2 (at) NCQD electrode slurry. The prepared MnO2-coated NCQD slurry can give full play to the electric double-layer capacitance characteristic of the NCQD and the pseudocapacitance characteristic of MnO2. The reversible redox reaction of the permanganate ion / manganate ion couple can provide additional pseudocapacitance contribution, so that the specific capacity of the electrode slurry is further improved.

The application belongs to the technical field of water treatment and resource, and discloses a kind of antimony-nitrogen co-doped turbo layered carbon-based material for treating fluorine wastewater, preparation and application of capacitive deionization electrode, with supramolecule as precursor, carbon skeleton is formed by pyrolysis and then element doping to prepare antimony-nitrogen co-doped turbo layered carbon-based material as anode material, with carboxyl activated carbon as cathode material, cathode and anode jointly constitute capacitive deionization system.Antimony-nitrogen co-doped turbo layered carbon-based material has layered loose controllable mesoporous structure, rich active sites and excellent specific capacitance caused by typical faradic pseudocapacitance.Antimony-nitrogen co-doped turbo layered carbon-based material capacitive deionization electrode shows excellent fluorine ion adsorption capacity in fluorine-containing wastewater, specifically, fast adsorption rate and large adsorption capacity.The capacitive deionization electrode has good engineering application prospect in actual wastewater treatment.

The invention discloses a self-energized supercapacitor, a preparation method thereof and an application of the self-energized supercapacitor in driving reverse iontophoresis, and belongs to the technical field of reverse iontophoresis and capacitors. The self-energized super capacitor comprises a Co / MXene-Co / LIG anode and a Cu / MXene-Co / LIG cathode. The MXene and Co-MOF composite modified laser-induced graphene electrode solves the problems that a traditional biological capacitor is insufficient in capacitive performance and low in energy storage efficiency, the pseudo-capacitive performance and the charge storage capacity of the electrode are remarkably improved, efficient energy storage and stable release are achieved, and the requirement of counter ion electroosmosis for continuous current is met. Therefore, the method has good application prospect and value in the technical field of reverse iontophoresis and capacitors.

The invention discloses a preparation method and application of a biomass-based carbon negative electrode material for a supercapacitor, and belongs to the technical field of supercapacitors. Bagasse is used as a raw material, impurities are removed through extraction with an ethanol aqueous solution, and a cellulose skeleton is reserved; a uniform spinning solution is formed through the synergistic effect of melamine and graphene oxide, and nitrogen doping and conductive network construction are achieved; a gradient sintering process is adopted, pre-sintering is performed to complete pyrolysis carbonization, high-temperature nitrogen sintering is performed to promote formation of graphite microcrystals, and three-dimensional continuous carbon nanofibers are obtained; phosphoric acid impregnation activation realizes controllable etching to form a mesoporous structure, and meanwhile, an oxygen / phosphorus-containing functional group is introduced. According to the method, a hierarchical pore structure mainly comprising mesopores is constructed, a carbon skeleton modified by an oxygen / phosphorus-containing functional group is formed, the ion transmission rate is improved by the mesoporous structure, the surface wettability is enhanced by the oxygen / phosphorus-containing functional group, and pseudocapacitance is provided. When the material is applied to a supercapacitor, the diffusion limitation of a microporous structure can be overcome, the charge storage capacity is enhanced, high specific capacitance and environmental friendliness are realized, and the performance bottleneck of a traditional carbon material is broken through.

The invention discloses a quantum dot doped NiCo-LDH composite material and a preparation method and application thereof, and belongs to the technical field of supercapacitor electrode materials. NiFe2O4 quantum dots are used as a doping agent, soluble Ni < 2 + > salt, soluble Co < 2 + > salt and trimesic acid are used as raw materials, a solvothermal reaction is performed to obtain an MOF loaded quantum dot precursor, and the MOF loaded quantum dot precursor is used for preparing the NiCo-LDH composite material. And triggering in-situ topological conversion of the MOF framework in the MOF-loaded quantum dot precursor to layered double hydroxides through alkali liquor, and synchronously realizing generation of an ultrathin nanosheet structure and uniform and firm doping of quantum dots. The quantum dot doped NiCo-LDH composite material disclosed by the invention is of a three-dimensional nano flower-shaped structure assembled by NiCo-LDH ultrathin nanosheets, and NiFe2O4 quantum dots are uniformly distributed on the nanosheets, so that the conductivity and the reaction activity of the composite material are effectively improved, and the composite material shows excellent pseudocapacitance performance and rapid ion diffusion capability.

The invention discloses a preparation method of a constant-temperature self-repairing flexible supercapacitor. The preparation method comprises the following steps: reducing graphene oxide (LTR-rGO) at a low temperature to retain gt; 15% of oxygen functional groups are used for improving dispersity and pseudocapacitance; alkane-coated Ag core-shell nanoparticles are prepared through a reversed-phase dropwise adding emulsification method, and constant-temperature regulation and control at the temperature of 25-45 DEG C are achieved; the lignin-based self-healing gel polymer electrolyte is crosslinked through hydrogen bonds and ions, and is loaded with Fh-BN and core-shell particles to improve the ionic conductivity to gt; 50 mS / cm; the electrode slurry contains 70wt%-85wt% of LTR-rGO, an interface is optimized through acid heat treatment, and a sandwich structure is assembled through reverse evaporation. The device is green and environment-friendly, high in flexibility (bending gt, capacity retention gt after 1000 times, 90%) and self-healing efficiency gt; the buffer temperature difference is 5-10 DEG C, stable operation is carried out at the temperature of-20-60 DEG C, and the specific capacity is gt; 400 F / g and the energy density gt; the service life is 50Wh / kg, and the service life is gt; the method is suitable for various wearable electronic devices.