56 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 device for performing direction control and separation on charged particles in electrolyte, which comprises a microfluid channel, the microfluid channel is provided with a sample inlet port and a sample outlet port, a fluid flows from the sample inlet port to the sample outlet port at a speed v0, a separation chamber is formed in the microfluid channel, the fluid contains the charged particles, and the separation chamber is communicated with the sample inlet port and the sample outlet port. Charged particles are separated in the separation chamber; the number of the electrodes in each group of electrodes is the same or different, each electrode is in contact with the fluid, a pseudocapacitor and / or a double-layer capacitor are / is formed on the contact interface of the electrode and the fluid, the electrodes are arranged in the microfluid channel in parallel, and a certain angle can be formed between the arrangement direction and the flowing direction of the fluid; a plurality of conductor leads; and each driving power supply is connected with one group of electrodes, the driving power supplies generate periodic voltage or current excitation, and the voltage excitation or the current excitation output by the driving power supplies in an output period is in a changing state.

The invention belongs to the field of organic wastewater resourceful treatment, and particularly relates to a humic acid'energy battery '-based wastewater biological treatment method and a humic acid'energy battery'-based wastewater biological treatment device. According to the invention, humic acid and a magnetic material are coupled to prepare a recyclable magnetic humic acid composite material; a wastewater resourceful treatment method is developed on the basis of the material and comprises the following cycle steps of a charging link, a degradation treatment link and a magnetic adsorption link. A treatment device is further developed on the basis of the characteristic, and intermittent charging and recycling of the magnetic humic acid composite material are achieved on the basis of the device. Charges are obtained from an electrode by utilizing the pseudocapacitance effect of natural organic matter humic acid, and are used as an energy battery to directly charge a microbial electron transfer path, so that the limitation of traditional interspecific electron transfer of microorganisms is broken through, and the problem of low microbial electron transfer efficiency in the biotransformation process of organic matters can be fundamentally solved; and the method has creative significance.

The invention discloses a preparation method of a nitrogen-doped graphene carbon nanotube high-power composite electrode material. The material is prepared by taking graphene oxide and carboxylated multi-walled carbon nanotubes as precursors and urea as a nitrogen source through synergism of chemical reduction and a hydrothermal method. A three-dimensional porous network structure is constructed through solvent dispersion, ultrasonic compounding, high-temperature reduction and hydrothermal doping processes, and the nitrogen-doped graphene carbon nanotube composite hydrogel is obtained. The electronic structure of the carbon material is regulated and controlled through nitrogen atom doping, active sites such as pyridine nitrogen, pyrrole nitrogen and graphite nitrogen are introduced, and the surface wettability and the pseudocapacitance performance are improved. The prepared NGM5 electrode has a high specific surface area (197.91 m < 2 > / g) and a multilevel mesoporous structure. 37.0 wt% H2SO4 is used as an electrolyte to assemble a symmetric supercapacitor, the surface capacity of 498 mF cm <-2 > and the energy density of 69.03 mu Wh cm <-2 > are realized at room temperature of 1 mA cm <-2 >, the energy density of 57.51 mu Wh cm <-2 > is still kept at the extreme low temperature of-60 DEG C, and the capacitance retention rate exceeds 70% after 8000 times of charge and discharge cycles. The preparation process is simple, the cost is low, graphene stacking and carbon nanotube agglomeration are effectively inhibited, the problem of low-temperature performance degradation of a traditional carbon-based material is solved, and the method is suitable for industrial production of a high-power and wide-temperature-range supercapacitor electrode material.

The present invention provides a cellulose-based porous carbon electrode material and a supercapacitor electrode prepared therefrom. The cellulose-based porous carbon electrode material is prepared by the following steps: Hydrazine hydrate, cellulose powder and nickel acetate hexahydrate are added to deionized water, ultrasonicated and uniformly mixed, and then the above mixture is transferred to the inner liner of a hydrothermal autoclave for hydrothermal reaction, filtered, washed and dried to obtain a cellulose-based carbon material; The cellulose-based carbon material is mixed with KOH, placed in a horizontal tubular furnace, and reacted under high temperature and in the presence of N2, and cooled to room temperature to obtain cellulose-based porous carbon; The cellulose-based porous carbon is stirred in an acid solution, washed to neutrality and dried to obtain the cellulose-based porous carbon electrode material. The cellulose-based porous carbon electrode material prepared by the present invention has the advantages of high specific surface area and cycle stability, as well as high specific capacitance and ideal pseudocapacitance.

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 relates to a carbon-based capacitor electrode material, a preparation method thereof and a carbon-based capacitor, and the preparation method comprises the following steps: carrying out the pulse discharge of carbon foam with the surface loaded with metal nanoparticles, and obtaining the carbon-based capacitor electrode material; the surface of the metal nanoparticles includes a carbon coating layer. A pulse discharge method is adopted to generate instantaneous high temperature within an extremely short time, the instantaneous high temperature is utilized to treat the carbon foam loaded with the metal nanoparticles on the surface, a part of the metal nanoparticles can catalyze decomposition and rearrangement of a surface carbon coating layer under the instantaneous high temperature condition, and sugar-coated haw-shaped carbon nanotubes grow on the surfaces of the metal nanoparticles, so that the carbon foam is prepared. When the electrode material is prepared, the energy storage area is increased, the number of active sites is increased, the remaining metal nanoparticles on the surface of the carbon foam migrate and provide abundant pseudocapacitance active sites, then preparation of the high-energy-storage carbon-based capacitor electrode material is achieved jointly, the preparation process is simple, rapid and efficient, and no dangerous and harmful product is contained.

The invention relates to the technical field of activated carbon production, in particular to a method for producing capacitive activated carbon from ultra-low-ash low-rank coal, which comprises the following steps: taking low-ash low-rank coal as a raw material, and effectively removing ash and inorganic salt through crushing, deionized water cleaning and vacuum drying; the pore structure is optimized through activating agent mixing and microwave assistance, and the mesoporosity is improved; carrying out post-treatment, removing the residual activating agent through diluted hydrochloric acid ultrasonic cleaning, and drying and forming; finally, a high-density oxygen / nitrogen-containing functional group is introduced through oxidizing agent surface modification and urea high-temperature nitrogen doping, and the pseudocapacitance effect and the electrochemical performance are remarkably enhanced. Through repeated cleaning with deionized water and combination of vacuum drying, the ash removal rate is increased to 95% or above, oxidation side reaction is avoided, and the purity of the raw materials is guaranteed; meanwhile, microwave-assisted activation is introduced, intercalation reaction of the activating agent and coal is accelerated by microwave selective heating, and mesoporous generation is promoted by microwave-induced molecular vibration.

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 is applicable to the technical field of capacitor materials, and provides a novel zinc ion hybrid supercapacitor positive electrode material, and a preparation method thereof comprises the following steps: respectively putting biomass powder and plastic fragments into a tubular furnace, carbonizing, and naturally cooling to obtain biomass pyrolytic carbon and plastic pyrolytic carbon; the preparation method comprises the following steps: mixing biomass pyrolytic carbon with plastic pyrolytic carbon or asphalt, adding NaOH, grinding, uniformly mixing, carrying out chemical co-activation, cooling to room temperature, washing, and drying to obtain the soft and hard heterostructure porous carbon. The soft and hard heterostructure porous carbon material is prepared for solving the bottleneck problems of slow ion transmission kinetics, unstable structure and the like of a high-quality load electrode, the ion transmission distance is shortened and the conductivity is improved through cooperative regulation and control of a hard carbon hierarchical porous structure and a soft carbon graphite microcrystalline structure, and the porous carbon material is prepared. N / O doping reduces C-O-Zn binding energy and charge transfer resistance, improves electric double-layer capacitance and pseudocapacitance, and has excellent electrochemical performance during high-quality loading.

The invention relates to the technical field of efficient utilization of raffinate acid and functional materials, and discloses a raffinate acid doped polyaniline derived carbon material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, adding raffinate acid into an aqueous solution containing aniline and an oxidizing agent; s2, after the mixed system is subjected to a polymerization reaction, freeze drying is performed to obtain raffinate acid doped polyaniline; s3, performing high-temperature treatment on the raffinate acid doped polyaniline to obtain a multi-element doped derivative carbon material; the preparation process of the carbon material is simple, complex equipment is not needed, the carbon material can be applied to the field of supercapacitors by combining the double-electrode-layer capacitance characteristic and the pseudocapacitance characteristic of the carbon material doped with multiple elements, the carbon material provides a new route for high-value utilization of the raffinate acid, excessive impurity removal treatment does not need to be conducted on the raffinate acid, and the cost is low. And the process cost is saved, and high social benefits and economic benefits are achieved.

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 discloses Zn-doped biomass derived porous carbon and application thereof in a capacitor, and relates to the technical field of carbon materials. Chitosan and pomegranate rind are selected as precursor materials and doped with water-soluble salt, carbonization and secondary activation are carried out, and porous carbon can be prepared. The carbon material prepared by the invention has the advantages of stable structure, excellent electrochemical performance, long cycle life, high specific capacitance and the like, and is very suitable for being used as a supercapacitor material. According to the method, potassium hydroxide is adopted in the first activation process, activation is achieved in the process, biomass charcoal with pomegranate rind as the raw material is purified, ZnCl2 is adopted in the second activation process, oxygen-containing functional groups are destroyed through the etching effect in the process, formation of a graphite layer in porous carbon is promoted, and therefore the pseudocapacitance effect is reduced; and the energy storage and release capability of the material is further enhanced.

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 present invention belongs to the technical field of composite materials and wastewater treatment, and relates to a ZnFe-PANI composite carbon material electrode and a preparation method thereof, and its application in the electrosorption of phosphate in capacitive deionization technology. The ZnFe-PANI composite carbon material electrode of the present invention comprises ZnFe-PANI nanoparticles and a carbon nanotube conductive network, and the ZnFe-PANI nanoparticles are uniformly dispersed in the carbon nanotube network by a precipitation method. Its preparation method comprises: preparation of polyaniline, preparation of ZnFe-PANI nanoparticles and preparation of an electrode. The ZnFe-PANI composite carbon nanotube electrode of the present invention can quickly remove phosphate from water bodies and meet phosphate discharge standards. The electrode of the present invention has the advantages of simple preparation process, low cost, rapid ion transport, good electrochemical stability and high adsorption capacity.

The invention belongs to the technical field of composite material preparation, and particularly relates to a preparation method and application of a ZnNiCoLDH / MXene composite material, ZnO is used as a conductive support frame, ZnO / ZIF-67 synthesized by adopting an oil bath method is used as a precursor, LDH is obtained through etching, then the LDH is compounded with an MXene material by adopting an electrostatic self-assembly method, and the ZnNiCoLDH / MXene composite material is obtained. The composite material is applied to preparation of a supercapacitor positive electrode, the obtained positive electrode material takes an MXene material as a conductive substrate, LDH nanosheets can be supported, agglomeration is prevented, exposure of active sites is increased, and the conductivity and the structural stability of the positive electrode material are improved; the LDH and the MXene material have a synergistic effect, the MXene material has high conductivity to promote electron transport, and the LDH can provide high pseudocapacitance, so that the electrochemical performance of the positive electrode material is improved.