777 results about "Cyclic voltammetry" patented technology

In one embodiment of the present disclosure, a series of conjugated polymers used, among other things, as polymer solar cell or polymer photovoltaic device active layer materials, is provided. In one embodiment, the conjugated polymers have the general structure and formula shown in (I), wherein: R1 and R2 are independently selected from proton, halogens, alkyls, aryls and substituted aryls; Ar is selected from the group consisting of monocyclic, bicyclic and polycyclic arylene, or monocyclic, bicyclic and polycyclic heteroarylene. In another embodiment, the conjugated photovoltaic polymers are comprised of repeated units having the general structure of formula (II), wherein, R1, R2, R3, R4, R5, and R6 are independently selected from proton, alkyls, halogens, aryls, substituted aryls, and other kinds of substituents. Synthesis methods of several polymers of the present disclosure are provided, and absorption spectra and electrochemical cyclic voltammetry data of some polymers, and also the photovoltaic properties of the polymers in this present disclosure are also provided.

An organic EL device includes a pair of electrodes, a light emitter layer obtained by mixing a hole transporting material made of a tertiary amine compound, an electron transporting material and a light emitting additive. The tertiary amine compound constituting the hole transporting material has only one oxidation potential as measured by the cyclic voltammetry. A difference in ionization potential between the hole transporting material and electron transporting material of the light emitter layer is 0.35 eV or greater.

The invention discloses a ferro-nickel oxyhydroxide-modified bismuth vanadate photoelectrode and a preparation method and application thereof. The preparation method comprises the following steps: firstly, depositing bismuth oxyiodide on the surface of conductive glass, then coating the surface with the deposited bismuth oxyiodide with a dimethyl sulfoxide solution of vanadyl acetylacetonate, annealing, performing alkali soaking and rinsing with water to remove excessive vanadium pentoxide, and then drying to obtain a bismuth vanadate photoelectrode, and modifying ferro-nickel oxyhydroxide on the surface of the bismuth vanadate photoelectrode by adopting a cyclic voltammetry method in a three-electrode system, thus obtaining the ferro-nickel oxyhydroxide-modified bismuth vanadate photoelectrode. The invention further discloses applications of the ferro-nickel oxyhydroxide-modified bismuth vanadate photoelectrode in photoelectrocatalytic decomposition water. The prepared photoelectrode is used for producing hydrogen from photoelectrocatalytic decomposition water, can inhibit the compounding of photon-generated carriers, the service life of carriers generated by a BiVO4 photoelectrode can be effectively prolonged, and the oxygen evolution reaction on the surface of the photoelectrode can be promoted, so that the solar optic hydrogen conversion efficiency of a semiconductor photoelectrode can be improved.

The invention discloses a making method of proton exchange film fuel battery pile in the fuel battery technical domain, which comprises the following steps: (1) pressing plane MEA into wave shape under heating condition; (2) adopting micro-fine pushing technique to punch the hyperthin plane metal plate; punching the plate with hole into wave shape to mate wave-shaped MEA; obtaining monopole board; (3) adopting laser welding technique to weld a couple of monopole board into double-pole board; (4) plating a layer of conductive polyaniline on the metal surface through circulating volt-ampere method. The invention improves the reacting efficiency and energy density, which lightens the weight and resists corrosion.

The invention discloses a preparation method for a graphene nanosheet/conducting polymer nanowire composite material. The preparation method comprises the following steps of: preparing a graphite oxide by utilizing a chemical oxidation method, dispersing the product into de-ionized water, adding an orthanilic acid into the mixed solution according to a proportion, and stirring the mixed solution to make the orthanilic acid fully adsorbed onto a partially reduced graphene oxide nanosheet; adding hydrazine hydrate according to a proportion, stirring the mixed solution, and performing washing, suction-filtration and vacuum drying by using absolute ethanol and the de-ionized water; ultrasonically dispersing the product into the de-ionized water to obtain graphene nanosheet suspension; and uniformly coating the prepared suspension on the surface of the conducting substrate by adopting a spin coating method, performing vacuum drying to form a thin film which is used as a working electrode, placing the working electrode, a counter electrode and a reference electrode into aqueous dispersion containing conducting polymer monomers, and clustering and depositing the monomers on the surface of the graphene nanosheet by using an electrochemical cyclic voltammetry technology. The method is simple, easy, low in reaction temperature, short in time and high in chemical uniformity.

The invention relates to a sensor, in particular to an ion selective electrode based on a conducting polymer film and a preparation method thereof. The ion selective electrode based on the conducting polymer film aims at solving the problem that a traditional ion selective electrode with internal reference solution is difficult to miniaturize and is short in service life. The ion selective electrode comprises an insulation electrode shell, a metal platinum wire, conducting polymer, an ion selective electrode film and a filled gold contact. The metal platinum wire is fixed into the insulation electrode shell, the electrode is arranged on the metal platinum wire, one end of the metal platinum wire is connected with the filled gold contact, the other end of the metal platinum wire forms the conducting polymer on the surface of the metal platinum wire through cyclic voltammetry, and the ion selective electrode film covers the conducting polymer. The ion selective electrode based on the conducting polymer film has the advantages of being miniaturized, and long in service life.

The invention relates to a method for preparing a graphene biosensor, belonging to the technical field of electrochemistry. The method comprises the following steps of: immersing a processed gold electrode into graphene oxide and a sodium sulphate solution, electrically depositing the electrode through a control electric potential, taking out the electrode, washing the electrode by using water, after drying the electrode at room temperature, putting the electrode in a chloroauric acid solution, electrically depositing the electrode through the control electric potential, taking out the electrode, washing the electrode by using water, and drying the electrode at room temperature; putting a modified electrode in a conductive polymer monomer and a supporting electrolyte solution, polymerizing the electrode through the control electric potential by adopting a cyclic voltammetry, taking out the electrode, washing the electrode by using water, and drying the electrode at room temperature; and activating the modified electrode in an EDC/NHS (Dichloroethane/N-Hydroxysuccinimide) solution, and immersing the modified electrode in a vomiting toxin antibody. The method disclosed by the invention is used for fixing graphene, gold nanoparticles and conducting polymers through electro-deposition; therefore, the method is very green and environment-friendly; furthermore, the thickness of a coating and sizes and distribution densities of the gold nanoparticles can be precisely controlled, thus, the batch production repeatability of the modified electrode is good.

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 method of analyzing accelerator of copper electroplating includes a selective adsorption step and an electrochemical deposition step. First, a gold electrode is placed into a plating solution, which contains organic additives. Then, the gold electrode is dipped in the plating solution for a while to adsorb the sulfur-containing accelerators. After the sulfur-containing accelerators are adsorbed on the gold electrode, the gold electrode is rinsed with Milli-Q ultra pure water. Then, the gold electrode is put into an electrolyte, which contains PEG and chloride ions to carry out a cathodic cyclic voltammetry (CCV) for copper deposition on the gold electrode. A calibration curve for the accelerator analysis can be obtained by integrating the polarization curve measured from the CCV.

The invention discloses an electrochromic material which is a porous film compounded through nickel oxide and 3, 4-ethylene dioxygen thiofuran, wherein the composite film has a random porous structure; the range of aperture is between 10 and 250 nm; and the thickness of the film is between 200 and 500 nm. The preparation method comprises the following steps: 3, 4- ethylene dioxygen thiofuran is used as a monomer; the porous nickel oxide is used as a conductive template; lithium perchlorate is added into an acetonitrile solution and is used as a supporting electrolyte to prepare the nickel oxide/poly3, 4-ethylene dioxygen thiofuran composite porous electrochromic film through an electrochemical cyclic voltammetry sedimentation method. The prepared electrochromic material has good mechanical performance and electrochromic performance, shows multiple electrochromism and rapid discoloring effect, can be assembled to a transmission-type or reflection-type full solid electrochromic device, and has wide application prospect in information storage recording, architectural glass smart window, large screen display, infrared stealth and other fields.

The cathodized gold nanoparticle graphite pencil electrode is a sensitive enzymeless electrochemical glucose sensor based on the cathodization of AuNP-GPE. Cyclic voltammetry shows that advantageously, the cathodized AuNP-GPE is able to oxidize glucose partially at low potential (around −0.27 V). Fructose and sucrose cannot be oxidized at <0.1 V, thus the glucose oxidation peak at around −0.27 V is suitable enough for selective detection of glucose in the presence of fructose and sucrose. However, the glucose oxidation peak current at around −0.27 V is much lower which should be enhanced to obtain low detection limit. The AuNP-GPE cathodization increases the oxidation peak current of glucose at around −0.27 V. The dynamic range of the sensor is in the range between 0.05 to 5.0 mM of glucose with good linearity (R²=0.999). Almost no interference effect was observed for sensing of glucose in the presence of fructose, sucrose and NaCl.

An organic electroluminescent device in which a light emitting layer is disposed between a hole injection electrode and an electron injection electrode, and a hole transporting layer is disposed between a hole injection electrode and a light emitting layer, wherein the hole transporting layer contains an electron trapping material exhibiting a reversible cathode reduction process in cyclic voltammetry measurement and having a reduction potential smaller than that of a hole transporting material contained in the hole transporting layer, or wherein the electron transporting layer contains a hole trapping material exhibiting a reversible anode reduction process in cyclic voltammetry measurement and having an oxidation potential smaller than that of an electron transporting material contained in the electron transporting layer.

The invention provides a method for preparing an organic nano thin film with super-hydrophobic function on magnesium, copper of stainless steel metal surface which relates to the metal surface treating and modification technique field. The method combines chemical etching with organic film plating. The organic film plating method can select potentiostatic method, constant current or cyclic voltammetry, the film plating time is 1-60min. A static contact angle between the compact organic nano thin film and distilled water is larger than 150 degree that can ensure metal surface having super-hydrophobic function. The method provided by the invention can be used for super-hydrophobic modification to metal surface with large area, in particularly for antifouling and rust prevention to metal surface, and can be used for transporting minim liquor without loss, treating surface of precision optical device mould to enhance demould effect, and enlarge using field of metal material. The method has advantages of simple technique, convenient to operate, high efficiency, short preparing period, low request to device, low cost, controllable thickness and easy to industrialisation producing.

The invention discloses an intercalation electrode constructed by pre-embedding ions into two-dimensional layered material and a preparation method and application thereof, belonging to the technicalfield of electrode material preparation for electrochemical energy storage devices. Firstly, the electrochemical ion pre-intercalation reaction system was constructed by using two-dimensional layeredmaterial as working electrode, solution containing pre-intercalated ions as electrolyte and high conductive material as counter electrode. The working electrode is applied with fluctuating potentials(cyclic voltammetry and galvanostatic charging and discharging techniques) in a specific voltage window by means of an electrochemical workstation, which forces ions to periodically intercalate between layers of two-dimensional layered materials in order to pre-open the ion transport channel. By controlling the final state potential, the pre-embedded ions are anchored between the inner layers of the two-dimensional material to achieve ion support, so as to construct a high-speed and stable ion transport channel, thereby enhancing the electrode function of the two-dimensional layered material and serving for the high-performance energy storage system.

The invention discloses a sulfur-doped three-dimensional porous cuprous oxide nano-material and application thereof to electrochemical hydrogen evolution reaction. A cuprous sulfide nano-rod is synthesized on three-dimensional copper foam as a precursor mainly by virtue of a normal temperature impregnation method, and the sulfur-doped porous cuprous oxide nano-material is obtained in an electrochemical preparation process. The sulfur-doped three-dimensional porous cuprous oxide nano-material is mainly applied to electrochemical hydrogen evolution, the catalytic activity is detected by adopting a linear scanning curve (polarization curve), and the stability of the material is tested by virtue of a cyclic voltammetry curve. According to the sulfur-doped three-dimensional porous cuprous oxide nano-material, a porous Cu2OxS(1-x) nano-structure is synthesized by a method which is convenient to operate to enlarge the specific surface area of the material, copper is combined with oxygen to collaborate active sites around the copper and improve the adsorbability of the copper for hydrogen, and anionic sulfur is further doped to greatly improve the catalytic activity of the material, improve the catalysis efficiency of electrochemical hydrogen evolution and effectively improve the stability of the catalyst.

The invention belongs to the technical field of preparation of graphene quantum dots, and relates to a method for preparing graphene quantum dots with adjustable oxygen content. The method comprises the steps that a brown graphene quantum dot water solution containing impurities is prepared through an electrochemistrical cyclic voltammetry method and then dialyzed, and a transparent flavescent graphene quantum dot water solution is obtained; the graphene quantum dots with different oxygen contents are prepared by regulating the oxidoreduction degree of an electrolyte in the electrochemistrical method preparation process. According to the method, the oxygen contents of the graphene quantum dots are effectively regulated, and the speed of preparing the graphene quantum dots through the electrochemistrical cyclic voltammetry method is increased. Meanwhile, the method is simple in preparation procedure, and has the advantages of being environmentally friendly and low in production cost and facilitating industrialization.

The invention belongs to the technical field of lithium metal batteries, and particularly relates to a method for preparing an anode porous copper current collector used for a lithium metal battery. The method at least comprises a first step of cleaning the surface of a Cu-X alloy sheet with a solvent to remove impurities on the surface of the Cu-X alloy sheet; a second step of preparing an acid solution; and a third step of preparing the porous copper current collector by scanning different numbers of turns from -1 V to different cut-off voltages by adopting linear scanning cyclic voltammetry in an electrochemical workstation, with a three-electrode system being utilized, platinum or nickel being adopted as a counter electrode, a saturated calomel electrode being adopted as a reference electrode, the Cu-X alloy sheet being adopted as a working electrode, and the acid solution prepared in the second step being adopted as an electrolyte. Compared with the prior art, the porous copper current collector having different pore diameters are etched through an electrochemical process by utilizing the Cu-X alloy sheet as a substrate and adopting acids having different concentrations as media. The current collector is used as a lithium metal battery anode current collector, and has functions of providing deposition space for lithium metal and limiting growth of lithium dendrites.

A method and biosensor device for detecting single strand target nucleic acid by cyclic voltammetry is described. A porous silicon chip is linked to bound DNA probe complementary to the target nucleic acid. The device is particularly useful for detecting microorganisms and viruses that may be pathogenic or cancer genes, however any target nucleic acid can be detected by using a specific DNA probe.

PCT No. PCT/NZ96/00088 Sec. 371 Date Apr. 14, 1998 Sec. 102(e) Date Apr. 14, 1998 PCT Filed Aug. 28, 1996 PCT Pub. No. WO97/09468 PCT Pub. Date Mar. 13, 1997This invention provides apparatus and a method for measuring the concentration of alumina in a molten electrolyte in a smelter. A test anode (101) (a mimic of the actual cell anode) supplied from a computer-controlled voltage source (303) with several to about (100) rapid cyclic voltammetry sweeps the voltage at which the anode effect occurs, as sensed by current measurement (305). In order to derive a measurement the voltage is compared within the computer (301) to previous measurements made from a calibration set of alumina samples in known concentrations. Brief rapid cycles and an improved electrode configuration help to provide results from the invention which are reproducible and accurate, and in addition the test electrode has a long life.

The invention discloses a preparation method of a carbon film coated platinum/graphene catalyst. Graphene is adopted as a carrier for the catalyst to hydrothermally reduce oxidized graphene, saccharides, polyvinyl pyrrolidone and chloroplatinic acid, and then high-temperature carbonization is carried out to obtain a cathode oxygen reduction reaction catalyst of a fuel battery, wherein the platinum loading amount is 10-50wt%. The catalyst has excellent methanol tolerance and catalytic cycle stability, the performances of the catalyst are greatly improved in 1000 times of cyclic voltammetry testing, and the catalyst is superior to the commercial platinum/carbon catalyst.

The invention relates to a composite membrane counter electrode used for dye-sensitized solar cells (DSSC) and a preparation method thereof, solving the problem that platinum counter electrodes of the existing DSSC have high preparation cost. The composite membrane counter electrode of the invention comprises a conductive substrate, a carbon material membrane and a polypyrrole membrane. The preparation method of the invention comprises the following steps: first preparing electrophoretic liquid of the carbon material and then electrophoretically depositing the carbon material membrane on the conductive substrate; preparing electrodeposition liquid of pyrrole and depositing the polypyrrole membrane on the carbon material membrane by cyclic voltammetry to obtain the carbon material/polypyrrole composite membrane counter electrode. The composite membrane counter electrode of the invention has good catalytic performance, good electrochemical stability, high conductivity and low preparation cost. The photoelectric conversion efficiency of the DSSC based on the composite membrane counter electrode of the invention reaches 4.267%, which is equivalent to that of the existing DSSC based on the Pt counter electrodes.

The invention provides a preparation method of NiCo<2>S<4>/carbon nanotube composite electrode material and relates to a preparation method for compounding carbon nanotube/foamed nickel with NiCo<2>S<4> nano-particles through electrochemical deposition. The preparation method comprises: a first step of preparing a carbon nanotube/foamed nickel substrate: evenly stirring carbon nanotubes, 60wt% of polytetrafluoroethylene and ethyl alcohol according to a certain ratio, applying the mixture to the surface of foamed nickel, and performing vacuum drying at the temperature of 80 DEG to obtain the carbon nanotube/foamed nickel substrate; a second step of preparing an electro-deposition liquid: dissolving Ni(NO<3>)<2>.6H<2>O, Co(NO<3>)<2>.6H<2>O and thioacetamide in distilled water according to a ratio, and evenly stirring the mixture to obtain the electro-deposition liquid; and a third step of, by taking the carbon nanotube/foamed nickel substrate as a working electrode, a platinum electrode as a counter electrode, and a saturated calomel electrode as a reference electrode, performing electrochemical deposition in the electro-deposition liquid through cyclic voltammetry to obtain the NiCo<2>S<4>/carbon nano tube composite electrode material. The composite electrode material NiCo<2>S<4> obtained by the method of the invention has a large binding force with the carbon nanotubes, and has relative high specific capacitance and excellent electrochemical performance stability while being used as the electrode of a supercapacitor.

The invention provides a poly (3,4-ethylenedioxythiophene) nanowire thin film. The poly (3,4-ethylenedioxythiophene) nanowire thin film is prepared according to the following synthetic method that in a three-electrode electrolytic cell, a mixed solution of 3,4-ethylenedioxythiophene monomer, a supporting electrolyte and an electrolytic solvent serves as an electrolyte solution, a gold electrode, a platinum electrode and an indium tin oxide conductive glass electrode or a fluorine-doping tin oxide conductive glass electrode serves as a working electrode, the gold electrode or the platinum electrode serves as an auxiliary electrode, a silver/silver chloride electrode serves as a reference electrode, polymerization reaction is conducted through a cyclic voltammetry or a potentiostatic method at the room temperature, and thus the poly (3,4-ethylenedioxythiophene) nanowire thin film deposited on the working electrode is obtained, so that a finished product is obtained after post-processing leaching and drying are conducted. According to the poly (3,4-ethylenedioxythiophene) nanowire thin film, the preparation method is simple and convenient, the reaction condition is mild, the product purity is high, and the prepared polymer thin film has an electrochromic performance and can be used as an electrochromic material to be applied to an electrochromic device.