12 results about "Current density" patented technology

The invention discloses a method for optimizing fuel cell performance based on frequency and a secant angle. The method comprises the steps that in the working condition of the optimal temperature and humidity at which the total internal resistance Rstack of a PEMFC is minimal, the internal resistance of each galvanic pile segment at the moment is measured, and the ideal high-frequency corner frequency f<optimal> and ideal secant angle alpha<optimal> of different electric current densities are acquired correspondingly; with the f<optimal> and the alpha<optimal> as optimization indexes, focusing on the galvanic piles in any working condition, it is only necessary to emit two frequency signals of the highest frequency (20 KHz) and the ideal corner frequency f<optimal> to monitor the current alpha angle, and through uninterrupted adjustment of relevant control variables, the current alpha angle is changed and tends toward the optimal angle alpha<optimal>, so that the galvanic piles are adjusted to the optimal working state. According to the method, improvement is conducted on traditional EIS methods, and the total internal resistance Rstack is quickly calculated by means of a simultaneous equation solution method; not only is optimization of the galvanic pile output performance of the PEMFC achieved from the internal resistance angle, but also the defects that by means of the traditional EIS methods, the hysteresis is large and real-time detection cannot be conducted are overcome, and operation is simpler and the optimization performance is better compared with traditional methods.

The invention discloses a method for electrochemical pretreatment on methyl sulcotrione pesticide wastewater. The method comprises the following steps: preparing a titanium-based tin antimony ruthenium cerium oxide electrode by using a coating-thermolysis method, feeding high-concentration methyl sulcotrione wastewater through an electrolytic cell which takes the titanium-based tin antimony ruthenium cerium oxide electrode as an anode, and continuously treating the wastewater for a certain time under certain current density. The titanium-based tin antimony ruthenium cerium oxide electrode is very good in stability, high in oxygen evolution potential and high in catalysis and oxidation capabilities. According to the method, the titanium-based tin antimony ruthenium cerium oxide electrode is adopted to pretreat high-concentration, high-salt and hard-biochemical wastewater generated in the production process of methyl sulcotrione, and the result shows that under conditions of certain pH values, current density and treatment time, the COD removal rate of the methyl sulcotrione can be greater than 50%, the BOD/COD is increased to be greater than 0.3 from less than 0.1, and the biodegradability is greatly improved. The electrochemical oxidation of the titanium-based tin antimony ruthenium cerium oxide electrode is very applicable to pretreatment on biochemical degradation of the high-salt high-concentration wastewater generated in the production of methyl sulcotrione.

The invention discloses a preparation method of ferric vanadate photocatalysts. According to the method, firstly, a direct current electrolysis method is used; by controlling the current density, the electrolyte concentration and the temperature, ferric vanadate with different appearance structures and particle diameters is prepared; then, products obtained at an anode are cleaned and filtered; obtained filter cake is dried for 4 to 6h at the temperature of 80 DEG C to 100 DEG C; natural cooling is performed to room temperature; finally, at the air atmosphere, the temperature is raised to 500 to 700 DEG C at the temperature rise speed of 2.5 to 10 DEG C/min; high-temperature roasting is performed for 3 to 5 h; the ferric vanadate with high purity and high cleanness degree can be obtained; the composition is FeVO4. The product obtained by controlling the corresponding conditions has the main appearance of ball-shaped particles and micro nanometer lines.

The invention discloses a porous carbon material prepared by using self-modification of pseudomonas putida and a preparation method and application thereof. Self accumulation PHA of the pseudomonas putida (Pseudomonas putida KT2440, preservation serial number of ATCC No.47054) is regulated and controlled by changing ingredients of a culture medium, and carbonization is carried out by directly adopting thallus collected by centrifugation to prepare the graded porous carbon material without any excitation steps. The germ self-modification derived porous carbon material has a large number of mesopore structures. The porous carbon material is used as an electrode material of a super capacitor, when electric current density is 0.5 A/g, the specific volume of the porous carbon material reaches 298 F/g; and when the electric current density increases by 20 A/g, the specific volume of the porous carbon material maintains by 234 F/g, and good electric capacity and excellent rate performance aredisplayed. The preparation method has the advantages of novelty, simple operation, low manufacturing cost and the like, the prepared material has the characteristics of graded bore diameter, large specific surface area, good electrical conductivity and excellent electrochemical performance, and is an electrode material for the ideal super capacitor or batteries.

This invention relates to the Sb2Te3 single-crystal nanometer line ordered array and its making method, the character is that the solutin is composed of the following componets: the citric acid coordination Sb3+; 4í†1 by Moore chroma,, nitrate dissolution Te power, 2í†3 by the SbO+í†HTeO2+ Moore chroma, wherein the pH of the plating liquid is 1-3, it uses the porous alumina templetits in the plating liquid as its working electrode and the black lead as its assistant electrode, its current density is controlled between 0.2mA/cm2 and 0.5mA/cm2, plating 0.5-2h can obtain the Sb2Te3 compound single-crystal nanometer line which grows in the 110 direction; and its single-crystal with hexagonal crystal series structure grows in the 110 direction, wherein the crystal cell parameter as follows:aú¢bú¢0.426nmíócú¢3.05nm. this invention fistly is under the condition of room-temperature and open system, and it uses electrochemical sediment principle to make the Sb2Te3 single-crystal nanometer line ordered array; the device in this invention is simple, which is easy to operate, and it fits for industry production.

The invention discloses a fish roe based porous carbon material. Fish roes are pre-carbonized at a low temperature to form a carbon precursor, and the carbon precursor and alkaline inorganic substances are directly mixed to prepare the fish roe based porous carbon material by calcination. A preparation method includes steps: 1) carbon precursor preparation; 2) carbon precursor activation; 3) porous carbon material aftertreatment. In application to an electrode material of supercapacitors, when the current density is 1A g<-1>, and a specific capacitance range is 222-396 F g<-1>. The method is simple in process, convenient to operate and easy to implement, and the prepared fish roe based porous carbon material serving as the electrode material of the supercapacitors is excellent in performance.

The invention discloses an advanced back side process fabrication method for improving IGBT performance. The method comprises the steps that: (1) after an IGBT front side process is completed, the backside of a wafer is thinned, and then donor impurity ions are implanted into the back side of the wafer; (2) laser annealing is conducted to the back side of the wafer to activate the donor impurity ions implanted in the back side, so that an N type buffer layer serving as a field stop is formed; (3) acceptor impurity ions are implanted into the back side of the wafer; (4) laser annealing is conducted to the back side of the wafer to activate the acceptor impurity ions implanted in the back side, so that a P type collector layer serving as a collector is formed. By means of the method, the better 'figure of merit' matching between the pressure endurance and pressure drop breakover of an IGBT is achieved, and due to the fact that the electric current density of the IGBT is increased, the device dimension of the IGBT can be decreased correspondingly, and it is achieved that the cost of the IGBT is reduced.

The object of the present invention is a method and an apparatus for underwater decomposition of organic content of aqueous waste solutions, involving the measurement and, if necessary, adjustment of the pH and electric conductivity of the solution, maintaining optimum pH and/or electric conductivity during the process, and further involving the partial or total decomposition of organic materials contained by the solution. The apparatus comprises a feed tank, at least one decomposition loop, and a storage tank. The method according to the invention is characterized by submerging electrodes in the solution, producing and maintaining an electric arc between the electrodes and the electrically conductive the solution, where the arc is produced by an electric current of at least 0.5 A/cm² current density at a voltage of at least 70 V and by a symmetrical alternating current having preferably a frequency of at least 10 Hz; and by decomposing the organic content of the solution into water, carbon dioxide, and nitrogen.

The embodiment of the invention relates to a circuit board processing method, comprising the following steps of: fixing a conductive coil on a first core board, arranging the conductive coil between the first core board and a second core board, and for leading the ports of the conductive coil out of the surface of the circuit board, drilling at the position of the ports, and electroplating at thepositions of port leading-out holes to obtain an electroplated layer for leading the ports out of the surface. The embodiment of the invention also provides a corresponding circuit board. Thus, the conductive coil is embedded in the circuit board and is not exposed on the surface of the circuit board, no loss is produced when current is introduced as the conductive coil is not exposed in the air,the electromagnetic properties of PCB (Printed Circuit Board) products are guaranteed, and especially the invention can be widely applied in the power supply industry with high requirement for current density.

The invention discloses an electroplating method for a watch shell. Electroplating liquid adopted by the electroplating method comprises the following components: 45-49 g/L of tin methanesulfonate, 35-39 g/L of copper pyrophosphate, 210-220 g/L of potassium pyrophosphate, 43-47 g/L of calcium chloride, 32-34 g/L of tin chloride, 15-25 g/L of disodium hydrogen phosphate, 6-8 mL/L of polyethylene glycol, 3-5 mL/L of polyethylene glycol alkyl alcohol ether, and 4-6 mL/L of gelatin. The electroplating method comprises the following steps: the pH value is 7.5-8.5; the current density is 3-5 A/dm2; the temperature is 35-45 DEG C; and the time is about 15-25 minutes.

The invention relates to a direct current cable semi-conductive shielding material selection method based on charge injection characteristic characterization, and belongs to the field of high-voltage direct-current cable insulation. According to the invention, through experimental design and space charge measurement, the contribution of foreign ions in the insulating layer of the high-voltage direct-current cable to space charges is eliminated, and the charge injection characteristics of different semi-conductive shielding materials are obtained. The electric field and temperature characteristics of the current density of different semi-conductive shielding material injectors are compared, and a material with low injection current density and small injection current density change along with the electric field intensity and temperature change under the same condition is selected as the semi-conductive shielding material of the high-voltage direct-current cable. The safety of the cable can be improved, the service life of the cable can be prolonged, and remarkable safety benefits and economic benefits are achieved.