119 results about "Maximum power density" patented technology

The invention relates to a preparation method of a composite anode of a microbial fuel cell with a carbon-base material modified by a conductive complex. The preparation method comprises purifying a multi-wall carbon nanotube; placing the purified multi-wall carbon nanotube into a 0.1 to 0.5mol/L supporting electrolyte solution, and dispersing the carbon nanotube in the solution, with 5% to 20% of carbon nanotube; adding 3,4-ethylenedioxythiophene monometers into the solution to obtain a well-dispersed 3,4-ethylenedioxythiophene/multi-wall carbon nanotube suspending solution; electrically depositing a complex on the anode surface by cyclic voltammetry; and carrying out vacuum drying, washing with deionized water, and room-temperature airing in sequence to obtain the modified anode. The method provided by the invention can reduce use amount of toxic reactants and shorten the preparation process so as to save the preparation cost. The modified anode has the advantages of peculiar surface effect, good conductivity and electrochemical activity, is remarkably improved in the maximum power density and open-circuit voltage in comparison with the unmodified anode when used in a battery, and can greatly reduce the battery internal resistance.

A microbiological fuel cell and a method for generating electricity by use of straws relate to a fuel cell and a method for generating electricity. The invention solves the problem that crop straws are not used efficiently, and particularly straw solids are not directly used in MFC. The microbiological fuel cell of the invention is composed of a container, catalytic anodes, anode wires, air cathodes, cathode wires, a cathode cover and a sealing cover. The method of the invention includes the steps of the pretreatment of the straws, the detoxifying treatment of the straws to obtain a straw solid substrate and a straw liquid substrate, the start-up of the cell, the treatment of the straw solid substrate or the straw liquid substrate. When the electricity is generated by the invention by using the straw solid substrate, the maximum power of the cell reaches 502mW/m<2>, and the degradation rate is about 45percent. When the electricity is generated by using the straw liquid substrate, the maximum power reaches 1288m W/m<2>, and the degradation rate of COD is 60 percent. The invention has the advantages of simple technology, convenient operation, high efficiency, no pollution, reduction of cost and relief of the energy crisis, and the straws in rural areas can be used efficiently.

The invention discloses preparation for a high-activity iron nitrogen carbon catalyst by adopting a middle-temperature carbonized metal framework compound pore expanding technology and belongs to thetechnical field of electrocatalysis. The preparation comprises the following steps: firstly, dispersing middle-temperature carbonized ZIF-8 nanoparticles into de-ionized water; adding a TPI water solution; carrying out ultrasonic treatment to uniformly adsorb, so as to adsorb [Fe(Phen)3]<2+> with positive charges into an expanded micro-pore to form a range-limited [Fe(Phen)3]<2+>@ZIF precursor; finally, carrying out high-temperature carbonization to obtain the high-activity iron nitrogen carbon catalyst provided by the invention. The high-activity iron nitrogen carbon catalyst is composed of three elements including Fe, N and C; the Fe and the N form a Fe-N4 ligand and the Fe-N4 ligand is embedded into a N-doped C matrix. The preparation disclosed by the invention has the advantages of simple technology, abundant raw materials and convenience for large-scale production. By adopting the preparation disclosed by the invention, an oxygen reduction catalyst with a single FeN4 active site is prepared and has excellent oxygen reduction activity under an acidic condition; the half-wave potential can reach 0.82V; compared with performance of a commercial Pt/C catalyst, the maximum power density of the high-activity iron nitrogen carbon catalyst in a proton exchange membrane fuel cell can reach 800mW cm<-2>.

The invention belongs to a dispersed multi-audio frequency modulation system resource distribution technique, which is characterized in that: in initialization step, loading maximum speed byte on the system, according to target error code demand, sub-channel attenuation and noise interference, and limited by system maximum power density spectrum and maximum QAM constellation size; in the target speed byte distribution step, processing multiple sub-channel parallel loading on one effective byte distribution relative to initialization loading process, utilizing blind-multiple/single-byte and/or non-blind single byte parallel increase and delete to quickly retract to target byte rate according to the difference between the initialization byte rate and the target byte rate. The invention can avoid general greed loading method, while it can keep the validity of byte loading in the parallel loading process that tending to the target byte rate, and realize the byte loading in optimized power distribution, with minimum calculation and less complex.

The invention relates to a microbiological fuel cell and a method for generating electricity by cassava waste mash, which belong to the field of environment protection and the comprehensive utilization of resources and aim to solve the problem that the cassava waste mash has big processing difficulty and is difficult to recycle. The double-chamber microbiological fuel cell is adopted. The invention specifically discloses a processing method for generating electricity by the cassava waste mash, which comprises the following steps: 1. carrying out solid-liquid separation; 2. carrying out ultrasound-high-temperature anaerobic short-range fermentation combined treatment; 3. starting the microbiological fuel cell; and 4. processing solid substance and supernate in each step. In the method, when cassava waste mash stoste is adopted for generating electricity, the maximum power density of the cell reaches 285mW/m2, and the total chemical oxygen demand (COD) degradation efficiency is 42%. When the fermented supernate is used for generating electricity, the maximum power density is 670mW/m2, and the solubility COD degradation efficiency is 91%. As a new path for disposing the cassava waste mash, the method makes up the deficiency existing in the traditional waste mash processing technology, the electricity generation performance of the processed waste mash can be obviously improved, and the mode of generating electricity by biomass resources, such as the waste mash and the like, becomes feasible.

A catalyst for oxygen reduction reaction (ORR) for a fuel cell was prepared by pyrolyzing a mixture of polyaniline, cyanamide, carbon black, and a non-precious metal salt under an inert atmosphere. The pyrolyzed product was treated to remove acid soluble components and then pyrolyzed again. The resulting powder was used to prepare a cathode for a membrane electrode assembly that was used in a fuel cell. When iron(III) chloride was used as the salt, the resulting catalyst was porous with a web-shaped structure. It displayed a maximum power density of 0.79 W/cm at 0.4 V in H₂/O₂ at 1.0 bar back pressure.

A method for clearing away an aged RTV coating of an insulator in a dry manner comprises the following steps of (1), determining the size and the shape of the insulator and the thickness, the use time and the RTV material composition of the RTV coating; (2), according to parameters determined in the step (1), determining a clearing-away power density threshold value and a damage power density threshold value output by lasers, wherein the clearing-away power density threshold value is the minimum clearing-away power density of the RTV coating to be cleared away, the damage power density threshold value is the maximum power density capable of being borne when the insulator surface covered with the RTV coating to be cleared away is radiated by the lasers, and when the damage power density threshold value exceeds the maximum power density, the insulator surface will be damaged; and thirdly, according to the clearing-away power density threshold value and the damage power density threshold value determined in the step (2), the power setting of a laser device is adjusted, and the output laser scans the surface of the insulator. According to the method, on the premise that the insulator surface is not damaged, the aged RTV coating of the insulator surface can be efficiently, conveniently and rapidly cleared away.

The invention discloses a method for designing a large-power-resisting broadband radar antenna cover, which belongs to the technical field of large-size ground radar antenna covers, and aims to solve the problems that a method for designing an antenna cover starting with material study is not applicable to large-size ground antenna covers. The method comprises the following steps: under the condition of broadband, acquiring maximum power density of radiation of an antenna according to an array antenna aperture field; selecting the material and structural parameters of the wall of the antenna cover; furthermore acquiring electromagnetic radiation energy absorption coefficients; furthermore, with the combination of energy conservation of heat conduction of the antenna cover, acquiring the temperature of the antenna cover under large-power radiation; judging whether the temperature resisting value of the material of the wall of the antenna cover at present is greater than the acquired temperature or not, if the temperature resisting value of the material of the wall of the antenna cover at present is greater than the acquired temperature, taking the antenna cover as a finally designed antenna cover, otherwise, reselecting an antenna cover structure material and redesigning the antenna cover. The method can be used for designing large-size ground radar antenna covers.

The present invention provides a method of production of grain-oriented electrical steel sheet greatly reducing the Watt loss of the grain-oriented electrical steel sheet and making the magnetostriction as small as possible, that is, a method of production of grain-oriented electrical steel sheet with small magnetostriction by improving the magnetic properties by irradiation by a finely focused laser beam comprising using a power modulated laser controlled in maximum power density to 1×10² to 1×10⁴ W/mm² to optimize the amount of strain given by laser irradiation in both the sheet width direction and rolling direction and, in particular, to make the modulation duty 70% to less than 100%.

The invention discloses a method for directly preparing a catalytic layer of a platinum monoatomic layer used for a proton exchange membrane fuel cell. The method comprises the following steps of directly preparing a Pd/C catalytic layer in advance by using the catalytic layer through electrospinning technique, selecting polymer such as polyacrylic acid as a binder, afterwards, in a three-electrode system, adopting an underpotential deposition method to deposit Cu of a monoatomic layer on the Pd/C catalytic layer, then performing replacement to obtain the Pt of the monoatomic layer, and finally preparing a Pd/C@PtML catalytic layer. The Pd/C@PtML catalytic layer serves as a cathode, the Pd loading is 0.15mg/cm<-2>, the Pt loading is 0.02mg/cm<-2>, the maximum power density of a single cellis 560mW/cm<-2> (H2-Air), so that the Pd/C@PtML catalytic layer is superior to a catalytic layer of which the cathode Pt loading is 0.09mg/cm<-2>. By carrying out single cell acceleration attenuationtests on two catalytic layers, the Pd/C@PtML catalytic layer can be found to have better stability.

The invention discloses a millimeter-wave dual reflector antenna capable of focusing a near-field wave beam. The antenna comprises a main reflector, an auxiliary reflector and a feed source, wherein a wave beam emitted by the feed source is reflected by the auxiliary reflector to the main reflector, and then emitted; a curved surface of the main reflector is a revolution paraboloid; and a central point of the main reflector is located at an intersection point of an emitting central axis of the auxiliary reflector and an axis of a radiation wave beam. The antenna is simple in structure and mature to process; the power density of a near-field region axis of the antenna is improved; the maximum power density of the axis is improved greatly under the same input power; a distance range of an effective power threshold is expanded; the efficiency of the antenna is improved; and a near-field gain of the antenna is increased.

The invention relates to a method for manufacturing a supercapacitor material by coating a MOF (metal organic frame) with dopamine, comprising the following steps: taking a bi-metal MOF as a template,coating with dopamine, annealing and vulcanizing to obtain a supercapacitor material of a Zn<x>Co<1-x>S@C (x = 0.01-1.0) hollow structure, wherein the bi-metal MOF contains two metal nodes of Zn andCo. According to the method in the invention, the bi-metal MOF is used as a template and a raw material, coating vulcanization with dopamine is carried out to form a stable hollow structure Zn<x>Co<1-x>S@C (x = 0.01-1.0), which is used as a high-performance supercapacitor positive electrode material, excellent performance is shown, the energy density is up to 55. 47 Wh kg<-1>, and the maximum power density which can be achieved is 16.55 kW kg<-1>.

The invention discloses a preparation method of a Co-MOF-GO film for microbial fuel cell and MFCs constructed by the preparation method, and belongs to the technical field of microbial fuel cells. Theinvention aims at solving the problems that an existing MFC anode is high in potential, low in power, short in period and the like. The preparation method comprises the following steps: 1, adding GOto water, performing uniform mixing, sequentially adding cobaltous nitrate hexahydrate and dimethyl imidazole, performing magnetic stirring, performing centrifuging, performing cleaning, and carryingout vacuum drying to obtain nanoparticles; 2, carrying out heat preservation heating under inert gas, and performing cooling to room temperature; 3, adding isopropyl alcohol and Nafion solution, and enabling the solution to uniformly disperse; 4, coating two sides of the carbon cloth with the mixture, and naturally drying the mixture. The constructed microbial electrolytic cell is an H-type double-chamber MECs. The maximum voltage of the MFCs is 0.56 V, the period is long, the COD removal rate reaches 79.195% +/-3.4766%, the coulombic efficiency reaches 9.3151% +/-0.5416%, and the maximum power density is 2303mV/m<2>.

The invention relates to the technical field of preparation of air electrode materials of rechargeable zinc-air batteries, in particular to a NiFe-LDH/Co-CNTs nanocomposite and a preparation method and application thereof. The method comprises the following steps: taking cobalt salt and 2-methylimidazole as reaction raw materials, taking carbon cloth as a substrate, growing to obtain a Co-ZIF nanosheet, and carbonizing to obtain a Co-CNTs/CC nano material; and then carrying out a hydrothermal reaction in a nickel salt and iron salt mixed solution, and obtaining the NiFe-LDH/Co-CNTs nano composite material with the surfaces of the Co-CNTs wrapped with NiFe-LDH. The material has high bifunctional activity, high power density and high stability; when the material is applied to a rechargeable zinc-air battery, the power density is 194mWcm <-2 >, the material has relatively high energy conversion efficiency and cycling stability, and when the material is used as an integrated air electrode for assembling a flexible zinc-air battery, the maximum power density of 142mWcm <-2> is achieved.

The present invention discloses a method for optimizing the thickness of a battery electrode. The method comprises the following steps: 1) taking the maximum energy density E or the maximum power density P as the optimization target of the method; 2) obtaining electrode structure design parameters, and electrode material kinetic parameters and thermophysical parameters of the base battery specification; 3) establishing an electrochemical thermo-coupling model, wherein the electrochemical thermo-coupling model is the coupling of a quasi-two-dimensional electrochemical model and a three-dimensional thermal model; 4) verifying the validity of the model; and 5) obtaining the optimized thickness of the battery electrode. According to the method disclosed by the present invention, the development period of new materials or new products can be effectively shortened, the development cost is reduced, and the certain guiding significance is offered for the development of new materials or new products.

The invention provides a method for preparing a composite negative electrode on a cerium-based electrolyte isolation layer through low-temperature sintering. According to the method, an ammonium citrate co-synthesis method is adopted to prepare battery negative electrode powder; roasted and phased powder is configured into negative electrode paste, and a three-in-one positive electrode//electrolyte/cerium-based electrolyte isolation layer is coated with the paste; and the obtained product is sintered at a temperature of 700-800 DEG C to obtain the battery negative electrode. The composite negative electrode has perovskite and cubic fluorite phase at the same time, and the composite negative electrode is a mixed ion-electron conductor and has small and uniform particle sizes and large specific surface area; and compared with the negative electrode prepared by a conventional mechanical mixing method, the highest power density of the negative electrode prepared by the invention at a temperature of 700 DEG C is improved by about 20%, and stable operation of the battery can be achieved.

This invention relates to an ion exchange membrane for a reverse electrodialysis (RED) device, a manufacturing method thereof and a reverse electrodialysis device including the ion exchange membrane, wherein the ion exchange membrane includes a porous polymer substrate; and a polymer electrolyte incorporated into pores of the porous polymer substrate. According to this invention, cation and anion exchange membranes for a reverse electrodialysis device have superior ion conductivity and thus can minimize membrane resistance, thereby remarkably improving maximum power density of the reverse electrodialysis device, and also have high water resistance and heat resistance, making it possible to stably operate the reverse electrodialysis device.

The invention discloses a preparation method and application of a supercapacitor material. The process comprises the steps of mixing and heating acetylene black, sulfuric acid and sodium p-styrenesulfonate, and performing a series of operation such as heat preservation, cooling, dilution, centrifugal separation and washing to obtain a modified carbon black compound; adding lithium dihydrogen phosphate and nickel chloride in a reaction kettle for reaction, and performing acid processing after drying; mixing the product and a reactant obtained through high-temperature reaction of acrylonitrile power, dimethyl sulfoxide and tetraethyl orthosilicate, and adding distilled water for ultrasonic dispersion, adding waterborne polyurethane emulsion, cobaltosic sulfide, stannous chloride, a triethanolamine salt and a silane coupling agent for high-temperature reaction; and finally, performing washing and vacuum drying to obtain a finished product. The supercapacitor material obtained by preparation is high in energy density, maximum power density and charge-discharge efficiency, and has relatively good application prospect. Meanwhile, the invention also discloses application of the supercapacitor material prepared by the process in preparation of a supercapacitor.

The invention belongs to the technical field of functional materials, and particularly relates to a polybenzimidazole proton conducting membrane with a double-network structure and a preparation method thereof. By using two cross-linking agents with different reaction temperatures to perform twice crosslinking on a linear PBI under different temperature conditions, the PBI membrane which has a double-network structure and can be used for a high-temperature fuel cell proton exchanging membrane is prepared. The test shows that when the modified membrane reaches the same gelling rate, the consumption of the cross-linking agent for the double-network structural membrane is reduced by 40 to 60 percent compared with that of the single-network structural membrane; and moreover, the cross-linkinggrid density is more uniform, the methanol permeability/air permeability/phosphoric acid migration rate is lower, the mechanical performance is better after the phosphoric acid is doped, and the chemical stability and thermal stability of the double-network membrane are higher than that of the non-modified PBI membrane; and meanwhile, the proton conducting rate (the proton conducting rate is 10<2>S.cm<1> scale with the linear PBI/phosphoric acid system) and the single cell performance (the maximum power density is 350 mW.cm<2>, and the current density is 1150mA.cm<2>) are high.

This invention describes the recipe and preparation process of nano-scale electrolyte suspension and its application via a spin coating process for fabrication of airtight/fully dense electrolyte layers composed in solid oxide fuel cell-membrane electrode assembly with high performance characteristics. The recipe of nano-scale electrolyte suspension includes 10˜50 wt % nano-scale electrolyte powder, 0.01˜1 wt % poly acrylic acid (PAA as dispersant), 0.1˜5 wt % poly vinyl alcohol (PVA as binder), 0.005˜1 wt % octanol as defoamer, and deionized water as solvent. Solid oxide fuel cell fabricated via this recipe and process exhibits that the open-circuit voltage (OCV) is over 1 Volt, and maximum power density is 335 mW/cm² at 800° C.