51 results about "Electron transfer resistance" patented technology

The invention relates to a production method of a fuel cell membrane electrode assembly. The method comprises the following steps: 1, dispersing a catalyst in a mixed solvent, and carrying out a vacuum defoaming technology to prepare a catalyst slurry; 2, directly coating two sides of a proton exchange membrane with the catalyst slurry prepared in step 1, and drying the catalyst slurry to obtain a membrane electrode CCM; and 3, fixing gas diffusion layers to two sides of the membrane electrode produced in step 2, and carrying out edge sealing treatment to produce the fuel cell membrane electrode assembly. Compared with the prior art, the method disclosed in the invention has the advantages of simple process, high efficiency, no hot pressing treatment, no deformation shrinkage of the proton exchange membrane, suitableness for batch production, and good product consistence; and there is no interface effect between every catalyst layer and the proton exchange membrane, so the proton and electron transfer resistance is low, the production cost of a fell cell is effectively reduced, and the fuel cell membrane electrode assembly is suitable for heavy-current discharge vehicle piles.

The invention provides a single-wall carbon nano tube-based ultrasensitive deoxyribonucleic acid (DNA) biosensor and a preparation method and application thereof. In the method, single-wall carbon nano tubes (SWCNTs) are grown on the surface of a silicon wafer on site by a chemical vapor deposition method, and gold nano particles are deposited on the surfaces of carbon nano tube electrodes by an electrochemical deposition technology. A single-stranded DNA (ssDNA) probe is self-assembled to the surfaces of SWCNTs-Au electrodes and subjected to hybridization reaction with complementary ssDNA. The change of electron transfer resistance before and after hybridization is recorded by utilizing the unique specific surface areas of the carbon nano tubes and the quick dynamic characteristics of the electrodes and by an electrochemical impedance method under the action of current signal amplification of nanometer gold to realize the quantitative detection of the complementary DNA. The detection limit of the sensor on the target DNA can reach between 10 and 20 M, so the sensor has the advantages of high sensitivity and selectivity, capability of being used repeatedly and the like, and has important significance in fields of medical diagnosis, the food industry, environment friendliness and the like.

The invention relates to a supercapacitor electrode material and aims to provide a method for preparing a nickel-cobalt-phosphorus integrated electrode material having a core-shell structure. The method comprises immersing a carbon cloth in a liquid having cobalt nitrate hexahydrate, nickel nitrate hexahydrate, urea, and ion water-ethanol mixed liquid to react; after the surface growth of NiCo precursor nanowire array substrate, immersing the carbon cloth in a liquid having the cobalt nitrate hexahydrate, the nickel nitrate hexahydrate, the hexamethylenetetramine, deionized water-ethanol mixedliquid to react; generating a high-temperature reaction in argon and sodium hypophosphite to obtain the nickel-cobalt-phosphorus integrated electrode material having a NiCoP@NiCoP core-shell structure on the surface. The material prepared by the method can be directly used as the electrode of a supercapacitor. The core-shell structure is disposed on the surface of the electrode material so as togreatly reduce the electron transfer resistance and improve the utilization rate of an active material, thereby further improving the electrode capacitance performance. The core-shell structure has aninternal space and a porous structure, can buffer the volume change of the active material in charging and discharging processes, improve structural stability, can improve the cycle performance.

The invention provides a method for detecting lysozyme. The method comprises the following steps of dispensing a metal organic skeleton solution to the surface of a gold electrode, carrying out incubating, washing and nitrogen drying; dispensing a lysozyme aptamer solution to the surface of the gold electrode, carrying out incubating, washing and nitrogen drying and carrying out first electrochemical impedance spectroscopy detection; washing the gold electrode after first electrochemical impedance spectroscopy detection, carrying out nitrogen drying, dispensing the solution to a to-be-detected sample, carrying out incubating, washing and nitrogen drying, and carrying out second electrochemical impedance spectroscopy detection; subtracting electron transfer resistance in a first electrical impedance spectroscopy from the electron transfer resistance in a impedance spectroscopy of the to-be-detected sample to obtain an electron transfer resistance difference and comparing with a default standard curve to obtain the concentration of the lysozyme. According to the embodiment of the invention, the adopted detection method is simple in operation, marking is not needed, the flexibility is relatively high, the detection limit can reach 2.0*10<-11>mol/L and the linear range is 1.0*10<-7>mol/L to 1.0*10<-11>mol/L.

The invention discloses a preparation method for counter electrode material of a dye-sensitized solar cell. According to the method, polyaniline/polyacrylonitrile composite nanofibers are prepared by using an electrospinning technique, and N-doped carbon nanofibers which have the advantages of large draw ratio and low cost are acquired after carbonization treatment, specific surface area of the carbon nanofibers is improved by reducing diameters of the carbon nanofibers; in addition, conductivity and stability of the composite material can be increased by introducing nitrogen atoms, and the nitrogen atoms can be used as the substrate of the composite material, so that more active sites can be provided for redox reaction of electrolyte under the catalysis of cobaltosic sulfide, electron transfer resistance is reduced, and thus energy conversion efficiency of the cell is improved.

The invention discloses a MOFs-derived nickel-cobalt double hydroxide array electro-catalysis oxygen evolution material and a preparation method thereof. The preparation method comprises the following steps: soaking foamed nickel in 2-methylimidazole, then adding Co salt, and continuously soaking to obtain a three-dimensional array precursor formed by in-situ growth of Co-MOFs nanosheets; and soaking the three-dimensional array precursor in Ni salt, and standing for reaction. The Co-MOFs array synthesized at room temperature is used as a precursor, the MOFs precursor is destroyed/recombined through an ion exchange strategy, the three-dimensional self-supported nickel-cobalt double hydroxide array electro-catalysis oxygen evolution material is obtained, the material provides more active sites and good three-dimensional conductivity, and the mass transfer process is accelerated; in addition, the catalytic activity is further improved through a strong coupling synergistic effect of bimetallic active sites; meanwhile, the MOFs derivative is in closer contact with the conductive substrate in an in-situ growth mode, and the electron transfer resistance is reduced.

The invention provides a double perovskite negative electrode material prepared through template synthesis and used for a potassium ion battery, and a preparation method thereof. The invention is characterized in that the composition of the negative electrode material is KY<0.8>Ba<0.2>Cr<0.9>Zn<0.1>Mo<0.9>Fe<0.1>O<6>; the continuous channel structure of gel is employed as a template in the process of preparation, and a double perovskite-structured product with continuous porous morphology and mutually bonded particle parts is formed, wherein such morphology is beneficial for reducing crystal boundary resistance and electron transfer resistance and accelerating potassium ion migration capability and oxidation reduction reaction rate; the double perovskite negative electrode material has certain structural rigidity, so buffering is formed for volumetric changes of the material during charging and discharging ; furthermore, due to co-occupation of position A by K and Y, electronic conductivity is improved; due to partial Ba doping at position Y, the conductivity of potassium ions is improved; Zn and Fe doping at position B can improve the stability of a perovskite structure; and thus, the potassium ion battery negative electrode material with high performance is eventually formed.

The invention discloses a double-perovskite lithium-ion battery anode material synthesized through electric field regulated selective crystallization and a preparation method of the anode material. The anode material is characterized in that the composition of the anode material is Na0.8Ba0.2Y0.9Li0.1Co0.9Zn0.1Nb0.9Mn0.1O6. The crystallization characteristic of crystals with lattice imperfection is changed by use of an applied electric field in the specific direction in a high-temperature solid-phase reaction during preparation, and cylindrical particles are formed through growing in the electric field direction; meanwhile, parts, with high surface curvature radiuses, of cylindrical particles unevenly adhere to a sintering aid to partially be adhered into continuous porous morphology. The morphology is beneficial to reduction of crystal boundary resistance and electron transfer resistance, increases the lithium-ion migration capacity and the redox reaction rate and has certain structure rigidity to form buffer for volume change; the lithium-ion battery anode material with high performance is formed through Na and Y co-occupation in position A, Ba doping in position Na, Li doping in position Y and Zn and Mn doping in position B.

The invention discloses applications of an RCW nano-sheet modified carbon felt material as a cathode in degradation of CIP. The preparation method of the RGO-Ce/WO3 nano-sheet modified CF material comprises: uniformly mixing a B1 solution and a B2 solution to obtain a solution B, dissolving graphene oxide in distilled water, and carrying out ultrasonic treatment for 1-2 h to form a suspension liquid so as to obtain a solution A; mixing and stirring the solution A and the solution B for 10-30 min to obtain a precursor solution, adding an HCl solution with a concentration of 2-3mol/L into the precursor solution in a dropwise manner, stirring for 10-30 min, then adding a (NH4)2SO4 solution with a concentration of 3-5mmol.L<-1>, stirring for 10-30 min, soaking CF into the obtained solution for10-30 min, taking out the CF after soaking, and calcining for 24 h at a temperature of 180 DEG C; and naturally cooling to a room temperature of 20-25 DEG C so as to obtain the RGO-Ce/WO3 nano-sheetmodified CF material. Compared with the traditional heterogeneous electro-Fenton technology, the technology of the invention has the following characteristics that RGO is used to replace carbon black,and no adhesive PTFE is used, so that the increase of electron transfer resistance and the coverage of active sites exposed on the surface can be prevented.

The invention belongs to the field of an electrode material and a preparation method and an application thereof and particularly relates to a glucose hydrothermal carbon and nitrogen co-doped graphitefelt electrode and the preparation method and the application thereof. The preparation method is characterized in that glucose, urea and carbon felt are used as raw materials, and the glucose hydrothermal carbon and nitrogen co-doped graphite felt composite material is synthesized through hydrothermal and high-temperature calcination. The method is advantaged in that the technical defect that anelectrode material prepared in the prior art is unstable in cycle performance is overcome, the composite electrode prepared is good in hydrophilicity, electron transfer resistance is effectively reduced, and thereby energy efficiency and the energy output of VRFB are improved.

A rechargeable battery state determination method determines whether a rechargeable battery is in a micro-short-circuit-prone state, which is a state that is highly likely to form a micro-short circuit. The rechargeable battery state determination method includes measuring an electron transfer resistance of the rechargeable battery by applying a voltage or current having a predetermined or higher frequency to an electrode system of the rechargeable battery, determining whether an inter-electrode distance is satisfactory based on a comparison of the measured electron transfer resistance of the rechargeable battery with a predetermined lower limit threshold value, in which the determining whether an inter-electrode distance is satisfactory including determining that the inter-electrode distance is satisfactory when the measured electron transfer resistance of the rechargeable battery is greater than or equal to the lower limit threshold value, and determining that the rechargeable battery is a conforming piece when the inter-electrode distance is satisfactory.

The invention provides a perovskite negative electrode material prepared through template synthesis and used for a lithium ion battery, and a preparation method thereof. The invention is characterized in that the composition of the negative electrode material is La<0.7>Li<0.2>Cs<0.1>Mn<0.8>Cu<0.1> Cd<0.1>O<3>; the continuous channel structure of gel is employed as a template in the process of preparation, and a perovskite-structured product with continuous porous morphology and mutually bonded particle parts is formed, wherein such morphology is beneficial for reducing crystal boundary resistance; a continuous electron transfer network is formed, and electron transfer resistance is lowered; a contact area between the prepared perovskite negative electrode material and an electrolyte is increased, and the perovskite negative electrode material has certain structural rigidity; furthermore, through Li doping at position A, lattice imperfection is increased, so the material can improve the diffusion rate of lithium ions and can be used as a negative electrode material corresponding to a lithium-free lithium-ion-battery positive electrode material; the sintering properties of particles are improved in virtue of Cs doping; Cu and Cd doping at position B can improve the stability of a perovskite structure; and thus, the lithium ion battery negative electrode material with high performance is eventually formed.

The invention discloses a manufacturing method of a carrollite-based super capacitor electrode plate. The method mainly comprises the following steps of successively adding a carrollite active substance and a coupling agent into absolute ethyl alcohol; then adding a cleaned and dried foamed nickel plate, carrying out ultrasonic treatment and vacuum drying, then pressing into sheets; and then carrying out vacuum heat treatment to obtain the carrollite-based super capacitor electrode plate. A capacitance value of the carrollite-based super capacitor electrode plate is more than 750F/g and an electron transfer resistance value is less than 0.2 ohm, and the active substance has good connectivity and is not easy to fall off.

Provided is a method for detecting an analyte, which method comprises: a) applying an alternating voltage to the analyte, wherein the alternating voltage comprises a plurality of superimposed frequencies sufficient to distinguish the presence of the analyte by electrochemical impedance spectrometry (EIS); and b) determining the identity and/or quantity of the analyte from EIS data.

The invention discloses an electrochemical DNA biosensor for detecting arthrobotrys oligospora and an application thereof. The electrochemical biosensor consists of a glassy carbon electrode, a manganese dioxide nanoparticle dispersion liquid layer and a probe DNA solution layer and is prepared by the following steps: preparation of nano manganese dioxide, preparation of a manganese dioxide/chitosan/glassy carbon electrode, and preparation of a modified electrode single-stranded DNA/manganese dioxide/chitosan/glassy carbon electrode; and after the electrochemical biosensor is hybridized with target DNA, the surface electron transfer resistance change before and after modification of the glassy carbon electrode is detected by use of an electrochemical impedance spectrum as a detection signal for detecting the target DNA. The electrochemical DNA biosensor is used for identifying the strain of nematode-trapping fungus arthrobotrys oligospora (A.oligospora). The invention has the following advantages: the electrochemical DNA biosensor is simple and easy to operate and responds quickly, the electrode has good selectivity, the probe DNA has high specificity, and the electrochemical DNA biosensor can be used for identifying the strain of nematode-trapping fungus arthrobotrys oligospora (A.oligospora). The invention has a good application development prospect.