354 results about "Carbon felt" patented technology

The invention discloses preparation and application of a diatomic catalyst modified carbon felt electrode. The preparation method of the modified carbon felt electrode comprises the following steps: dissolving bismuth salt, cobalt salt and urea in water to obtain a complexing solution; immersing the carbon felt substrate subjected to acid activation into a complexing solution for soaking treatment, then taking out the carbon felt substrate, and drying to obtain a precursor-loaded carbon felt; and sequentially carrying out primary heating, cold shock and secondary heating treatment on the precursor-loaded carbon felt, and cooling to obtain the Bi-Co diatom modified carbon felt electrode. The carbon felt electrode can be applied to an all-vanadium redox flow battery. The innovation point of the invention lies in that through the synergistic effect of double atoms and the mutual cooperation of the nitrogen-doped carbon substrate, the intrinsic activity bottleneck of the traditional catalyst is broken through, the comprehensive advantages of high catalytic activity, excellent stability and low cost are achieved, and a new technical solution is provided for the high performance and large-scale application of the flow battery.

The application provides a cement-based zinc ion hybrid capacitor, a preparation method thereof and application of the capacitor in an energy storage device. The cement-based zinc ion hybrid capacitor comprises an active carbon positive electrode, a zinc foil negative electrode and a composite air-entraining mortar interlayer arranged between the two electrodes. The active carbon positive electrode is active carbon loaded on a carrier with good conductivity, and the carrier is any one of carbon-based materials such as carbon felt, carbon fiber and graphite plate or any one of foils, meshes and foams of metals such as stainless steel, copper, titanium and nickel and alloys thereof. The composite air-entraining mortar interlayer between the two electrodes is immersed in an electrolyte under negative pressure. The composite air-entraining mortar has interconnected pores, and ions are transmitted through the electrolyte in the pores and participate in electrode reactions. The application mainly provides a porous cement-based solid electrolyte based on a composite air-entraining technology and a structural electrochemical energy storage device, and the structural energy storage device can simultaneously have good energy storage characteristics and mechanical properties.

The invention relates to the technical field of battery testing, and provides a flow battery bipolar plate flow channel diversion performance testing device, which comprises an intelligent testing galvanic pile, which is composed of a plurality of detachable flow channel units, each flow channel unit comprises a bipolar plate and two flow channel frames, the flow channel frames adopt a modular design, and the flow channel units are connected with the intelligent testing galvanic pile; a plurality of micro pressure sensors, temperature sensors and flow sensors are embedded in the shell; the intelligent liquid path system comprises a plurality of independent liquid path circulating units, and each unit is composed of a liquid tank, an intelligent liquid pump, a liquid supply pipeline and a liquid return pipeline; a plurality of independent test chambers are arranged in the multifunctional shell, and a temperature and humidity control system and an intelligent drainage system are arranged in the shell; and the data acquisition and analysis system consists of a high-performance computer, a data acquisition card, a signal amplifier and analysis software. The problems that in the prior art, the local flow characteristic of the electrolyte on the surface of the carbon felt is difficult to accurately evaluate, and the requirement of optimizing flow channel design on refined data cannot be met are solved.

The invention discloses a carbon fiber-based solar photo-thermal conversion material as well as a preparation method and application thereof, relates to the technical field of solar photo-thermal conversion materials, and solves the problems of poor mechanical performance and photo-thermal conversion performance of an existing photo-thermal conversion material. The preparation method comprises the following steps: thermally mixing a polyvinyl alcohol sodium alginate mixed solution, a graphene oxide solution and a cross-linking agent aqueous solution to prepare a cross-linking precursor solution; the preparation method comprises the following steps: by taking a carbon felt as a substrate, injecting a crosslinking precursor solution into the substrate by utilizing a vacuum infusion process, infiltrating the carbon felt, performing aging crosslinking, and then performing directional freeze drying to obtain a modified carbon felt; preparing an electroplating solution by using copper sulfate, sodium potassium tartrate tetrahydrate, disodium hydrogen phosphate and formaldehyde, adjusting the pH value by using NaOH, growing copper on the surface of the modified carbon felt by using an electroplating process, and carrying out vacuum drying; and putting the modified carbon felt subjected to vacuum drying after electroplating into a tubular furnace to obtain the carbon fiber-based solar photothermal conversion material. The method has a wide application prospect in the field of seawater evaporation desalination.

The invention relates to a coal chemical wastewater treatment device with nano-catalysis coupled with bioelectrochemistry. The invention belongs to the technical field of coal chemical wastewater treatment. The device comprises a pretreatment area, a bioelectrochemical treatment area, a catalyst recovery area and a clear water area which are connected in sequence, a nano Fe3O4 / TiO2 composite catalyst filling layer and a microporous aeration device are arranged in the pretreatment area; a biological anode region of the biological electrochemical treatment region adopts a graphene modified carbon brush, and a biological cathode region of the biological electrochemical treatment region adopts a sulfur-doped carbon felt; and the catalyst recovery area adopts a high-gradient permanent magnetic roller and is matched with a pulse backwashing system. The treatment cost of each ton of water is reduced to 25-35 yuan, and the cycle life of the catalyst is gt; the time is 200 times; the sulfur can be reused in a desulfurization process of a sewage treatment plant, so that the medicament cost is reduced; the carbon emission is reduced by 60%; the COD removal rate is not less than 95%, the total phenol removal rate is not less than 98%, and the total nitrogen removal rate is not less than 90%; energy consumption is reduced by 40% compared with a traditional electrochemical method, and the catalyst recovery rate is gt; 95%.

The invention discloses a preparation method of a modified zinc-bromine flow battery carbon felt negative electrode and the carbon felt negative electrode prepared by the method, and belongs to the field of zinc-bromine flow batteries. According to the method, after the carbon felt is soaked in a mixed solution of cuprous sulfate, water and acetonitrile, the acetonitrile is gradually evaporated from the solution through heating, the cuprous sulfate is gradually subjected to disproportionation reaction, and the copper elementary substance generated by the disproportionation reaction of the cuprous sulfate is deposited on the surface of the carbon felt, so that the purpose of loading the modified carbon felt with the copper elementary substance is achieved. The copper elementary substance is relatively stable in chemical property and has good zinc affinity, and the copper elementary substance is loaded on the surface of the carbon felt, so that the overpotential of zinc nucleation can be reduced, and reaction active sites on the surface of the carbon felt are increased. Besides, relatively strong acting force exists between copper and zinc, so that uniform deposition / stripping of zinc in the charging and discharging process is facilitated, a more uniform zinc deposition layer is formed on the surface of the carbon felt, formation of zinc dendrites is reduced, and the electrochemical performance of the zinc-bromine flow battery is improved.

The invention provides silicon nitride and aluminum nitride powder and a preparation method, and relates to the technical field of ceramic powder. The preparation method of the silicon nitride and aluminum nitride powder comprises the following steps: mixing aluminum powder and aluminum nitride raw powder to obtain a first mixture; mixing silicon powder, silicon nitride raw powder and ammonium salt to obtain a second mixture; paving the first mixture and the second mixture in a material frame padded with a carbon felt, and separating the first mixture from the second mixture by using the carbon felt; the material frame is placed in a self-propagating reaction kettle, nitrogen is introduced after vacuumizing, and the first mixture is ignited so as to induce a combustion synthesis reaction of the second mixture; and after the combustion synthesis reaction, cooling to room temperature, releasing the pressure in the self-propagating reaction kettle, taking out a synthetic product, and grinding the synthetic product to obtain silicon nitride powder and aluminum nitride powder. The purity of the powder material can be improved.

The invention relates to the technical field of alkaline zinc-manganese flow batteries, in particular to an alkaline flow battery based on carbon felt surface functionalization and electrolyte additive collaborative optimization. The surface functionalization of the carbon felt is that the carbon felt is modified by nitrogen-doped carbon dots, so that the pore size of the carbon felt is increased, the pore volume, the specific surface area and the hydrophilicity of the carbon felt are improved, the wettability of an electrolyte and the adsorption capacity to zinc atoms can be enhanced, and more zinc deposition sites are provided. Sodium gluconate is selected as an additive and is coordinated with zinc ions in the negative electrode electrolyte, so that the solvation structure of the zinc ions is changed. Through cooperative regulation and control of carbon felt modification and sodium gluconate, the zinc deposition morphology is changed, the zinc deposition is compact and uniform, the performance of the battery is improved, and the cycle life of the battery is prolonged. The invention has the advantages of outstanding performance, safety, environmental protection, low price and the like.

The invention belongs to the technical field of redox flow batteries, and particularly discloses a high-performance hierarchical pore carbon felt electrode for a flow battery and a preparation method of the high-performance hierarchical pore carbon felt electrode for the flow battery. Zinc salt or bismuth salt is dissolved in a solvent, and a precursor solution is obtained through stirring and ultrasonic treatment; dipping the pre-oxidized felt into the precursor solution, performing ultrasonic treatment, taking out and drying; and carbonizing the dried carbon felt at a high temperature in a protective atmosphere, treating with nitric acid, cleaning with deionized water, and drying to obtain the hierarchical porous carbon felt electrode with high activity and high specific surface area. The prepared high-performance hierarchical pore carbon felt electrode has a multi-scale pore structure and rich active sites, the specific surface area, the conductivity and the catalytic activity are remarkably improved, meanwhile, the hydrophilicity is optimized, and the electrolyte wettability is enhanced. The method is short in technological process, high in efficiency, low in cost and suitable for large-scale production and industrial application of the high-performance carbon felt electrode.

The invention discloses a composite material and application thereof in electrochemical carbon dioxide capture, and belongs to the technical field of electrochemistry and carbon dioxide capture. The composite material provided by the invention comprises a carbon felt and a 1, 4-naphthoquinone compound, the 1, 4-naphthoquinone compound is loaded on the carbon felt; the 1, 4-naphthoquinone compound comprises at least one of 1, 4-naphthoquinone, 2-methyl-1, 4-naphthoquinone or 2, 3-dimethyl-1, 4-naphthoquinone, and the compound is a compound of the 1, 4-naphthoquinone, the 2-methyl-1, 4-naphthoquinone and the 2, 3-dimethyl-1, 4-naphthoquinone. In the composite material disclosed by the invention, a 1, 4-naphthoquinone structure of the 1, 4-naphthoquinone compound can realize specific capture of CO2 through a reversible oxidation-reduction reaction, a carbon felt three-dimensional porous framework provides a smooth channel for CO2 mass transfer and electron transmission, and the 1, 4-naphthoquinone structure and the carbon felt three-dimensional porous framework cooperate with each other to solve the problems of low capture capacity, poor stability and high energy consumption of a traditional carbon material; therefore, the method has a good application prospect in electrochemical carbon dioxide capture.

The invention belongs to the technical field of microbial fuel cells, and particularly relates to a microbial fuel cell, a carbon-based anode and a preparation method of the carbon-based anode. Preparing a polyaniline / dopamine modifier from an aniline monomer and dopamine hydrochloride, and modifying the polyaniline / dopamine modifier on a carbon felt electrode to form a PANI-DA / CF anode; the preparation method comprises the following steps: preparing flower-like Fe2O3 nanoparticles by adopting a hydrothermal method, and electrochemically depositing the flower-like Fe2O3 nanoparticles on a PANI-DA / CF electrode to prepare a Fe2O3 / PANI-DA / CF anode; according to the microbial fuel cell disclosed by the invention, the maximum power density of the phenol wastewater anolyte reaches 4594 + / -97 mW / m < 2 > and is improved by 83.1% compared with that of a carbon felt anode MFC (Microbial Fuel Cell); after operation for 96 hours, the phenol degradation rate reaches 99.4%; and the electricity generation performance is still kept stable after three months of operation. The Fe2O3 / PANI-DA / CF anode provided by the invention improves the power density output of the microbial fuel cell and the wastewater treatment efficiency.

The invention discloses a carbon felt electrode for a zinc-bromine flow battery as well as a preparation method and application, and belongs to the technical field of zinc-bromine flow battery production, the method comprises the following steps: immersing a carbon felt into an acid solution for chemical etching, etching uniform grooves in the carbon fiber surface of the carbon felt, cleaning and drying to obtain a pretreated carbon felt; the preparation method comprises the following steps: dissolving tin salt and nickel salt in deionized water, and adding a hydrolysis inhibitor to obtain a precursor solution; and immersing the pretreated carbon felt into the precursor solution, carrying out electro-deposition under constant current by adopting a direct-current power supply by taking the re-selected untreated carbon felt as a counter electrode, washing the pretreated carbon felt subjected to electro-deposition with water, and drying for the second time to obtain the carbon felt electrode for the zinc-bromine flow battery. By utilizing the zinc affinity of Sn and Ni, zinc is preferentially deposited on Sn and Ni sites of the carbon felt electrode, the deposition depth is obviously enlarged, the zinc deposition space is optimized, the zinc deposition area capacity is effectively improved, and the problem that the surface capacity of the carbon felt electrode is limited is solved.

The invention belongs to the field of batteries, and provides a high-current-density long-circulation zinc-bromine flow battery negative electrode electrolyte and battery preparation. The battery comprises a positive electrode, a negative electrode, a diaphragm, positive and negative electrolyte, a current collector and an end plate, the diaphragm is a cation exchange membrane; and the negative electrode electrolyte comprises a metal salt, a supporting electrolyte, an organic carboxylate complexing agent and deionized water. The organic carboxylate complexing agent disclosed by the invention can be adsorbed on a porous electrode, and by increasing zinc deposition sites, inhibiting two-dimensional interface diffusion and promoting zinc mass transfer, zinc dendrites are relieved, and the zinc-bromine flow battery with high current density and long circulation stability is realized.

The embodiment of the invention relates to the technical field of flow batteries, and provides a carbon felt electrode for a flow battery and a preparation method thereof, and the preparation method comprises the following steps: preparing a mixed salt solution containing first metal ions and second metal ions; preparing an alcohol solution containing 2-methylimidazole; adding the mixed salt solution into the alcohol solution, and uniformly mixing to obtain a precursor solution; immersing the cleaned carbon felt into the precursor solution for a first time, then taking out the carbon felt, cleaning the carbon felt with an alcohol solvent, and drying the carbon felt to obtain a ZIF carbon felt; and putting the ZIF carbon felt into a tube furnace protected by inert gas, and carrying out heat treatment at a preset temperature for a preset second time to obtain the carbon felt electrode. The invention provides a novel bimetallic catalyst, and the interaction between metals can promote the adsorption and activation of reactants on metal atoms and promote the proceeding of the reaction. In the nitrogen-carbon catalyst formed by carbonizing ZIF, metal ions are uniformly dispersed, and agglomeration of the metal ions in the synthesis process is prevented.

The invention discloses a redox flow battery stack and an electrode frame, which are applied to the technical field of redox flow batteries, and comprise a main body plate with a liquid inlet and a liquid outlet, a shunting flow channel which is arranged on the main body plate and is provided with a plurality of shunting ports, and an electrochemical reaction area which is arranged between a liquid inlet shunting flow channel and a liquid outlet shunting flow channel, the liquid inlet is communicated with the liquid inlet end of the electrochemical reaction area through the liquid inlet shunting flow channel, and the liquid outlet is communicated with the liquid outlet end of the electrochemical reaction area through the liquid outlet shunting flow channel; the at least one uniform distribution pipe is arranged in the electrochemical reaction area and is used for supporting a carbon felt electrode, a liquid inlet opening of each uniform distribution pipe is connected with a shunting opening of the liquid inlet shunting flow channel, and a liquid outlet opening of each uniform distribution pipe is connected with a shunting opening of the liquid outlet shunting flow channel; and the side wall of the uniform distribution pipe is provided with a liquid separation port communicated with the electrochemical reaction area. And the uniform contact between the electrolyte and the carbon felt electrode can be realized, and the fastening support of the carbon felt electrode can also be realized.

The application discloses a carbon nitride / carbon felt electrode for a vanadium redox flow battery and a preparation method thereof, and belongs to the technical field of battery materials. The preparation method comprises the following steps: (1) soaking carbon felt in an ethanol solution containing an iron salt compound and then drying; (2) suspending the dried carbon felt in a closed container, adding a pyrrole monomer, and reacting at a constant temperature under an inert atmosphere to obtain a polypyrrole / carbon felt, which is cleaned and dried; (3) soaking the polypyrrole / carbon felt in an ethanol solution containing a zinc salt compound and then drying; (4) gradually increasing the temperature of the dried polypyrrole / carbon felt under an inert atmosphere to perform high-temperature carbonization, and obtaining carbon nitride / carbon felt; and (5) performing pickling and water washing on the carbon nitride / carbon felt, and obtaining the carbon nitride / carbon felt electrode after drying. In the application, the iron salt is used to catalyze the polymerization and deposition of pyrrole on the surface of the carbon felt, and finally high-temperature carbonization is performed to form various nitrogen-doped structures on the surface of the carbon felt, so that the liquid affinity and the electrochemical reaction activity of the electrode surface are significantly improved, and the energy efficiency of the battery is improved.

The utility model provides a gripping device for a liquid flow frame and carbon felt assembly, which comprises an adsorption plate, a frame adsorption part and a felt adsorption part are arranged on the adsorption plate, and the frame adsorption part is positioned on the peripheral side of the felt adsorption part. The liquid flow frame can be adsorbed and grabbed through the frame adsorption part, and the carbon felt can be adsorbed and grabbed through the felt adsorption part, so that the liquid flow frame and the carbon felt can be grabbed in a combined manner, and the production efficiency can be improved.

The invention discloses a preparation method of a modified zinc-bromine flow battery carbon felt negative electrode and the carbon felt negative electrode prepared by the method, and belongs to the field of zinc-bromine flow batteries. A copper organic matter precursor is heated and gasified in a double-temperature-zone tubular furnace, molecules of the partially gasified copper organic matter precursor are loaded to the position where a carbon felt is located by hydrogen and adsorbed on the carbon felt, the copper organic matter precursor reacts with the hydrogen to form a copper elementary substance, and the copper elementary substance is attached to the surface of the carbon felt to form a load. Therefore, the purpose of modifying the carbon felt by loading the copper elementary substance is achieved. According to the method, the obstruction of low conductivity of the loaded oxide on electron transfer in the zinc deposition / stripping process is overcome; inactivation caused by reaction of loaded metal active sites and electrolyte acidic components is avoided; and the problem that the internal fibers of the carbon felt are difficult to uniformly load metal elementary substances or oxide particles due to high surface tension between the metal salt solution and the carbon felt is solved, efficient and uniform loading of the copper elementary substances on the carbon felt is realized, and the negative electrode performance of the zinc-bromine flow battery is remarkably improved.

The invention relates to the technical field of electrolyte repair, in particular to an online electrolyte repair device and method. The device is used for repairing the vanadium battery electrolyte with unbalanced valence state. The device comprises a first storage tank, a repairing electric pile and a flow direction adjusting assembly, the first storage tank is used for containing repair liquid; the repairing electric pile comprises a positive electrode side and a negative electrode side which are separated by a diaphragm; the positive electrode side is provided with a first interface and a second interface, and the first interface and the second interface are both connected to the first storage tank; the negative electrode side is connected to a second storage tank for containing the electrolyte to be repaired in the vanadium battery energy storage system; and the flow direction adjusting assembly is used for adjusting the flow direction of the repairing liquid in the positive electrode side. According to the device, the carbon felt structure and the repairing liquid circulation mode are optimized, so that the discharge of reaction gas in the repairing electric pile can be promoted, and the repairing efficiency of the vanadium battery electrolyte is further ensured.

The invention relates to a preparation method of an electrode, the electrode and a metal-based flow battery. The preparation method of the electrode comprises the following steps: S100, cleaning and drying a carbon felt; s200, preparing an MXene colloidal solution; and S300, loading the MXene colloid on the surface of the carbon felt in situ by adopting an electrochemical deposition method to form the MXene-coated CF composite electrode. Through the arrangement, the high-zinc-ion-concentration IHP layer is constructed on the negative electrode of the battery by using MXene to inhibit dendritic crystal formation and reduce polarization loss, and the high-current-density performance and cycling stability of the zinc-bromine flow battery are improved.

The invention discloses a preparation method of high-density aluminum oxide ceramic and the high-density aluminum oxide ceramic, and the preparation method comprises the following steps: adding a silane coupling agent ethanol solution into alpha-Al2O3 powder for modification treatment to obtain modified powder; the modified powder is subjected to doping treatment, doped powder is obtained, and the mass percent of the modified powder in the doped powder is larger than 97.5%; the method comprises the following steps: filling doped powder in a preset range of a key area of a graphite mold, filling pure modified powder on the outer layer of the doped powder, and wrapping carbon felt after pre-pressing and compacting to obtain a pre-pressed sample; the pre-pressed sample is put into a rapid hot-pressing sintering furnace, O2 / Ar mixed atmosphere is introduced, the temperature is gradually increased to a first sintering temperature, and meanwhile, the pressure applied to the mold is gradually increased to the sintering pressure according to the temperature increasing progress; keeping the temperature for a period of time at the first sintering temperature and the sintering pressure; after heat preservation is finished, the sintering pressure is kept, the temperature is reduced to a second sintering temperature, natural cooling is conducted to the room temperature, and the target high-density aluminum oxide ceramic is obtained.

The invention discloses continuous carbonization, graphitization and purification equipment and method and a readable storage medium, and belongs to the field of carbon felt processing. The problems of low working efficiency and high manufacturing cost of carbonization, graphitization and purification of the hard carbon felt are solved; according to the technical scheme, the device comprises a first vacuum pump, a plurality of treatment bins and a plurality of transition bins, every two treatment bins are connected through the corresponding transition bin, each treatment bin is provided with at least one first steering mechanism, each transition bin is provided with at least one second steering mechanism, and the first steering mechanisms are matched with the second steering mechanisms; the plurality of treatment bins are respectively a carbonization and graphitization bin, a purification bin and a cooling bin, the carbonization and graphitization bin, the purification bin and the cooling bin are connected in sequence, the carbonization and graphitization bin is further connected with a feeding bin, the cooling bin is further connected with a discharging bin, the feeding bin, the transition bin and the plurality of treatment bins are respectively and movably connected with at least one propelling component, and the propelling components act on the charging tray; the method is applied to the carbon felt production process.

The invention discloses a method for preparing oxide eutectic ceramics in an ultrafast high-temperature furnace. Proportioning the raw material powder according to the eutectic components, and sequentially carrying out ball milling, drying, sieving and compression molding; putting the green body into a thin-wall graphite crucible, and putting the thin-wall graphite crucible into an interlayer hole of a heating carbon felt element; and heating to a set temperature in an ultrafast manner, keeping the temperature for an extremely short time, and cooling to obtain the oxide eutectic ceramic. According to the method, the eutectic structure of the oxide ceramic is rapidly formed by adopting ultrafast heating and Joule heat radiation heating at the furnace temperature far lower than the eutectic temperature, and the structure morphology of the eutectic ceramic can be regulated and controlled by adjusting temperature parameters. The obtained eutectic structure is fine in size and excellent in mechanical property; the problems that an existing oxide eutectic ceramic preparation method is long in consumed time, high in cost, complex in bulk material preparation process and the like are solved.

The invention relates to the field of all-vanadium redox flow batteries, in particular to a sulfurized polyacrylonitrile-based electrode, a preparation method thereof and application of the sulfurized polyacrylonitrile-based electrode as an all-vanadium redox flow battery negative electrode material. The invention provides a negative electrode of an all-vanadium redox flow battery, which takes a carbon felt electrode as a matrix and is loaded with sulfurized polyacrylonitrile. The sulfurized polyacrylonitrile is used as a negative electrode catalytic material for the all-vanadium redox flow battery, so that the electrocatalytic activity of a negative electrode reaction can be improved, the reaction kinetics is accelerated, and the battery performance is improved. Meanwhile, the sulfurized polyacrylonitrile and the negative electrode matrix carbon felt have the same molecular skeleton, so that the sulfurized polyacrylonitrile can grow on the surface of the carbon felt in situ, the adhesive force of the catalyst sulfurized polyacrylonitrile and the carbon felt is improved, and the cycling stability of the all-vanadium redox flow battery is further improved. In addition, the power density of the all-vanadium redox flow battery under high current density can be improved by using the sulfurized polyacrylonitrile as the negative electrode catalyst.

The present invention relates to a positive electrode material for a bromine-based flow battery. The positive electrode uses a conductive current collector as a substrate, and a layered porous carbon nitride material with bromine fixation function is supported on the substrate. The substrate is carbon felt, graphite felt or carbon cloth. The electrode material of the present invention has beneficial characteristics such as simple preparation method, low cost, strong bromine fixation ability, and good chemical stability. The prepared electrode material inhibits the migration and diffusion of bromine, reduces the self-discharge reaction of the battery, effectively improves the capacity retention rate and cycle stability of the bromine-based flow battery, and greatly improves the battery life.

The invention discloses a carbon nitride / carbon felt electrode for an all-vanadium redox flow battery and a preparation method of the carbon nitride / carbon felt electrode, and belongs to the technical field of battery materials. The preparation method comprises the following steps: (1) soaking the carbon felt in an ethanol solution containing a ferric salt compound, and drying; (2) suspending the dried carbon felt in a closed container, adding a pyrrole monomer, carrying out a constant-temperature reaction in an inert atmosphere to obtain a polypyrrole / carbon felt, and cleaning and drying the polypyrrole / carbon felt; (3) soaking in an ethanol solution containing a zinc salt compound, and drying; (4) gradually heating the dried polypyrrole / carbon felt in an inert atmosphere for high-temperature carbonization to obtain a carbon nitride / carbon felt; and (5) carrying out acid pickling and water washing on the carbon nitride / carbon felt, and drying to obtain the carbon nitride / carbon felt electrode. Ferric salt is adopted to catalyze pyrrole to be polymerized and deposited on the surface of the carbon felt, and finally, high-temperature carbonization is performed to form various nitrogen-doped structures on the surface of the carbon felt, so that the lyophilic property and electrochemical reaction activity of the surface of the electrode are remarkably improved, and the energy efficiency of the battery is improved.

The invention discloses an electrocatalytic biological denitrification system and denitrification method of a ruthenium-plated electrode composite hollow fiber membrane, and is characterized in that the system comprises a positive / negative electrode chamber arranged on a double-chamber UASB reactor, and a composite biological electrode in the chamber, the composite biological electrode adopts a ruthenium-plated iridium-titanium mesh barrel with a carbon felt wrapped on the periphery as a negative electrode, and the ruthenium-plated iridium-titanium mesh barrel is coated with a hollow fiber membrane. A hollow fiber membrane separation sludge is arranged in the barrel; a ruthenium-iridium-plated titanium mesh is coated with a carbon felt to serve as an anode, electroactive bacteria produce nitrogen / nitrate through anaerobic ammonia oxidation, ammonia nitrogen is electrochemically oxidized into nitrite, anode nitrogen enters a cathode to strengthen mass transfer, cathode nitrite flows back to the anode to be recycled, and efficient conversion and removal of nitrogen are achieved. Compared with the prior art, the system has the advantages of efficient conversion and removal of nitrogen, the pollution of the hollow fiber membrane is reduced and the membrane loss is reduced by utilizing the N2 synthesized by degrading the pre-degradation matrix through the electroactive microorganisms and the additional electrochemical action of the two electrodes, and the system is simple in structure and convenient to maintain and has a good application prospect.

The embodiment of the invention discloses a carbon nanotube modified carbon felt electrode and a preparation method and application thereof. The method comprises the following steps: providing an initial carbon felt electrode; and placing the initial carbon felt electrode on an alcohol-based fuel lamp, and firing at a preset firing temperature for a preset time so as to grow a carbon nanotube on the initial carbon felt electrode in situ, thereby obtaining a target carbon felt electrode. According to the preparation method of the carbon nanotube modified carbon felt electrode disclosed by the embodiment of the invention, the carbon felt electrode is placed on the alcohol-based fuel lamp, and the carbon nanotube is grown in situ by firing the carbon felt electrode at the preset firing temperature for the preset time, so that the preparation method is simple, and the hydrophilicity and catalytic activity of a carbon felt electrode material in a flow battery can be improved; and the current density of the flow battery is further improved.

The invention discloses a platinum-based high-entropy alloy self-supporting catalyst as well as a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: S1, dissolving a platinum source, an iron source, a cobalt source, a molybdenum source and a manganese source in a solvent according to the molar ratio of platinum to iron to molybdenum to cobalt to manganese being 1: 1: 1: 1: 1 to obtain a precursor solution; s2, dipping the carbon felt in a polyvinyl alcohol solution, and drying to obtain a substrate; and S3, dipping the substrate in the precursor solution, drying, and carrying out Joule heat flash evaporation to obtain the catalyst. According to the invention, five metals are added according to an equal molar ratio, the catalytic efficiency of the water electrolysis catalyst is improved by utilizing a high-entropy effect, the production cost of the catalyst is reduced, meanwhile, the long-time stability of the catalyst is improved by adding a self-supporting material, and an efficient and stable water electrolysis process in an acidic electrolysis environment is realized.

A vertical continuous carbon felt pre-oxidation device comprises a furnace shell body, an inlet and an outlet are formed in the right side and the left side of the furnace shell body respectively, a plurality of transmission control bins sequentially arranged from top to bottom and a plurality of electrode protection bins sequentially arranged from top to bottom are arranged on the furnace shell body, a first tightening roller is arranged in each transmission control bin, and a second tightening roller is arranged in each electrode protection bin. A roller rod is arranged on each transmission control bin in a penetrating mode, a quartz heating tube is arranged on each electrode protection bin in a penetrating mode, a first heat preservation layer is arranged on the inner wall of the furnace shell body, a second heat preservation layer is arranged in the middle of the furnace shell body, and a second tightening roller is arranged at the top of the second heat preservation layer. The heating space is greatly reduced through a multi-layer heating mode, the pre-oxidation efficiency is greatly improved through multi-layer heating, the energy consumption is greatly reduced, and the cost is saved; and the occupied area of the integrated furnace shell is greatly reduced compared with the occupied area of the conventional multi-section combined furnace shell, so that the utilization rate of the plant space is higher.