47results about How to "Wide potential window" patented technology

An all-solid-state lithium ion secondary battery containing a novel garnet-type oxide serving as a solid electrolyte. The garnet-type lithium ion-conducting oxide is one represented by the formula Li_5+XLa₃(Zr_X, A_2-X)O₁₂, wherein A is at least one selected from the group consisting of Sc, Ti, V, Y, Nb, Hf, Ta, Al, Si, Ga, Ge, and Sn and X satisfies the inequality 1.4≦X<2, or is one obtained by substituting an element having an ionic radius different from that of Zr for Zr sites in an garnet-type lithium ion-conducting oxide represented by the formula Li₇La₃Zr₂O₁₂, wherein the normalized intensity of an X-ray diffraction (XRD) pattern with a diffraction peak, as normalized on the basis of the intensity of a diffraction peak, is 9.2 or more.

The invention discloses a novel electrochemical DNA sensor constructed by a nanogold and partially-reduced graphene oxide (p-RGO) modified ionic liquid carbon paste electrode (CILE) as a platform prepared by an electrochemical method, and a method of applying the CILE to detect the Listeria feature gene sequence. 1-hexylpyridiniumhexafluorophosphate as a modifier is used for preparing the substrate electrode CILE, gold nanoparticles are deposited on the surface of the substrate electrode CILE and then the p-RGO is prepared by controlling electrochemical reduction conditions; an amino-modified probe ssDNA is fixed on the surface of the electrode by an amido bond covalent bonding method through carboxyl groups remained on the surface of p-RGO to constitute ssDNA/p-RGO/AuNPs/CILE; methylene blue (MB) as an indicator is used for detecting the hybridization reaction after a target sequence is hybridized, and a differential pulse voltammetry (DPV) is used for detecting the Listeria feature gene segment.

The invention discloses preparation of a three-dimensional graphene manganese dioxide nano-composite modified electrode and a capacitive property test method thereof. An ionic liquid modified electrode is prepared firstly, and then three-dimensional graphene and manganese dioxide nanomaterial are electrodeposited on the surface of the ionic liquid modified carbon paste electrode by utilizing a constant potential method so that a three-dimensional graphene manganese dioxide nano-composite modified carbon paste electrode is obtained. The three-dimensional graphene manganese dioxide nano-composite modified electrode acts as a working electrode, a platinum sheet acts as an auxiliary electrode and a saturated calomel electrode acts as a reference electrode, and capacitive property of three-dimensional graphene manganese dioxide nano-composite material is tested by applying a cyclic voltammetry, an AC impedance method and a constant current charge and discharge method. The three-dimensional graphene manganese dioxide nano-composite modified electrode is simple in preparation method, high in single electrode capacitance and great in cycle performance so as to be suitable for rapidly testing capacitive property of super-capacitor electrode material.

An electrochemical gas sensor (9) has improved electrochemical measurement properties and housing tightness for an electrolyte at the sites at which the connection lines (11, 21, 31) pass through. The sensor (9) includes a housing (4), containing at least one measuring electrode (1) and a counterelectrode (2) and with electric connection lines (11, 21, 31) from the electrodes (1, 2, 3) to a measuring unit (8) arranged outside the housing (4). The electric connection lines (11, 21, 31) include carbon nanotubes (CNT, Carbon Nanotubes) at least in some sections in the housing (4) in the area of the electrolyte wetting.

The invention relates to a biosensor, particularly relates to a preparation method and catalytic application of a Nafion/horseradish peroxidase/tricobalt tetraoxide-graphene/ionic liquid carbon paste electrode (Nafion/HRP/Co3O4-GR/CILE) and belongs to the technical field of electrochemical analysis and detection. According to the preparation method of the Nafion/HRP/Co3O4-GR/CILE, an ionic liquid carbon paste electrode is used as a substrate electrode, and by virtue of the specific advantages of a Co3O4-GR nano composite material of large surface area and good biocompatibility, HRP is adsorbed on the surface of the material; and furthermore, the material is fixed by a Nafion film to prepare the Nafion/HRP/Co3O4-GR/CILE. HRP in the modified electrode keeps a natural structure and biological activity. Research on electrochemical properties of the modified electrode shows that the modified electrode has good electrochemical catalysis capability on trichloroacetic acid (TCA), and can be used for effectively detecting TCA, and the detection limit is 0.33mmol/L. The preparation method and the catalytic application, provided by the invention, do not cause environmental pollution; the modified electrode has good stability, repeatability and sensitivity, and the preparation process is simple, low in cost and easy to operate, so that the modified electrode has wide social benefits.

The invention provides a preparation method of a composite electrode material. The preparation method comprises the following steps of performing mixing on soluble divalent nickel salt, soluble divalent cobalt salt, hexamethylene tetramine, lanthanum manganate and a solvent to obtain a mixed liquid; adding foamy nickel into the mixed liquid to be subjected to a hydrothermal reaction to obtain a precursor; and performing drying and annealing on the precursor in sequence to obtain the composite electrode material. A core-shell nanometer flower structure is grown on the conductive substrate foamynickel to be directly used as an electrode, so that use of a conductive agent and a binder in the conventional coating method can be avoided, and extra contact resistance is lowered; and through a synergistic effect of NiCo<2>O<4> and LaMnO<3>, the potential window is expanded and the energy density of a supercapacitor is improved.

The invention relates to a preparation method and an application of a gynecological tumor marker immune sensor constructed with ordered mesoporous carbon. The invention belongs to the technical field of novel nano-grade functional material and biosensor. The preparation method is characterized by: (1) the preparation of an ordered mesoporous carbon nano-grade material; (2) the preparation of an ordered mesoporous carbon-toluidin blue composite material; and (3) the preparation of the gynecological tumor marker immune sensor. The gynecological tumor marker immune sensor provided by the invention has the advantages of fast identification, high sensitivity, low detection limit, low cost, and convenient operation. With the gynecological tumor marker immune sensor, high-sensitivity, specific, rapid, and accurate detections of various gynecological tumor markers can be realized. Sample determination can be finished in 3min, such that batched sample determination can be realized within a short period of time.

The invention provides an electrolyte for a super capacitor. In the electrolyte, a solvent is water, and a solute is 2 to 6M sodium perchlorate. The invention also provides the super capacitor, which comprises an anode, a cathode, a diaphragm between the anode and the cathode, and the electrolyte, wherein the electrolyte is 2 to 6M aqueous solution of sodium perchlorate. The aqueous solution of sodium perchlorate with high concentration has high ionic conductivity, the sodium perchlorate is difficult to separate out at a low temperature, and the aqueous solution of sodium perchlorate has low freezing point and can adapt to a low-temperature work environment; and the aqueous solution of sodium perchlorate has wide electrochemical window and good electrochemical properties at the same time. The super capacitor provided by the invention has high ionic conductivity, the capacity is slowly attenuated during charge and discharge, and the energy density and power density are high; and in addition, the electrolyte and the super capacitor provided by the invention have the advantages of simple preparation process, low cost of raw materials, convenient operation and reduction in production cost and using cost.

The invention discloses a lubricating agent, a friction pair and a method for controlling a friction coefficient between the friction pair. In the method for controlling the friction coefficient between the friction pair, the friction pair comprises a first friction piece and a second friction piece. The method comprises the following steps of: applying the lubricating agent between the first friction piece and the second friction piece; applying a potential to the first friction piece through the lubricating agent; and controlling the friction coefficient between the first friction piece and the second friction piece by controlling the potential, wherein the lubricating agent comprises propylene carbonate and an additive; and the additive is selected from at least one of a cationic surfactant, an anion surfactant and a zwitter-ion surfactant. The method is easy, convenient and practicable, and has a large applicable load speed range; and according to the method, the friction coefficient between the friction pair can be controlled effectively, and electrochemical corrosion of the friction pieces of the friction pair can be delayed effectively, even avoided.

Relating to the field of analytical chemistry detection, the invention provides a carbon paste electrode for detection of hydroquinone, and a preparation and detection method thereof. The carbon paste electrode for detection of hydroquinone comprises a carbon paste, an electrode tube, an electrode lead wire, and a graphene oxide coating. The electrode tube has a first end and a second end opposite in positions, the carbon paste is pressed into the electrode tube from the first end of the electrode tube, the electrode lead wire contacts the carbon paste, and is led out from the second end of the electrode tube, and the graphene oxide layer is formed on the surface of the first end. The carbon paste electrode modifies graphene oxide to a carbon paste electrode substrate, and graphene oxide is an excellent modifier and has good electrocatalytic response to hydroquinone. Also the carbon paste electrode has the advantages of simple making, long service cycle, good stability, high sensitivity, low cost, easy preparation and excellent reproducibility, etc., and can be used for determination of hydroquinone in water samples. In addition, the invention also relates to a preparation method of the carbon paste electrode and a detection method of hydroquinone.

The invention relates to an aluminum ion battery and a preparation method thereof, and belongs to the technical field of high-performance batteries. The aluminum ion battery comprises an anode, a cathode, a diaphragm and an electrolyte, wherein the anode comprises a current collector and an active substance; the main component of the active substance is polyaniline/ordered mesoporous carbon composite material; the cathode is a high-purity aluminum sheet or aluminum foil; the diaphragm is a glass fiber diaphragm; the electrolyte is an aluminum-containing room-temperature melting ionic liquid. The aluminum ion battery has the advantages that the cycle property is good, the specific capacity is high, the rate property is good, the coulomb efficiency is high, and the like; the sources of the electrode material are wide, the cost is low, and the preparation method is simple; the aluminum ion battery can be widely applied to multiple fields, such as portable electronic equipment, electric automobiles and communication industry.

The invention relates to an asymmetric super capacitor with cobalt hydroxide and active carbon as the anode and the cathode respectively and a preparation method thereof. The anode adopts a carbon material/cobalt hydroxide electrode, the cathode adopts a carbon material or a foamed nickel/active carbon electrode, the anode and the cathode are separated by a diaphragm such as a polypropylene sulfonic acid membrane, an electrolyte is an alkaline aqueous solution, and a single super capacitor or super capacitor set is assembled. The cobalt hydroxide of the anode provides a pseudocapacitor and the active carbon of the cathode provides an electrical double-layer capacitor, so that the specific capacitance is effectively improved, and the electric potential working window of the capacitor is widened, thereby improving the energy density of the super capacitor. The cobalt hydroxide material of the anode takes quasi-reversible oxidation reduction reaction, and the active carbon of the cathode performs static physical absorption, so that the asymmetric super capacitor is good in cyclic stability and has a long service life. The super capacitor set adopts a flexible package form, so that the mass energy density of a super capacitor overall device is greatly improved.

The invention discloses a CMS/MnO2/PPY (carbon microsphere/manganese dioxide/polypyrrole) composite electrode material, as well as a preparation method and application thereof. The method is convenient to operate, mild in condition, low in cost and environment-friendly, and commercial and large-scale production is easy to implement. The surface of a prepared CMS contains a large number of active groups capable of reacting with potassium permanganate in situ to generate nanoscale MnO2 attached to the surface of the CMS, and the CMS/MnO2 material has a relatively wide potential window. Moreover, the surface of MnO2 is uniformly coated with PPY according to a chemical oxidation method, the PPY of the prepared CMS/MnO2/PPY composite electrode material is dispersed more uniformly, conductive particles are required to penetrate through shorter paths, and the electrical conductivity and specific capacity of the CMS/MnO2/PPY material can be remarkably improved. The CMS/MnO2/PPY composite electrode material is used as an electrode material for a supercapacitor, and has very high specific capacity, high power density, high cycling stability and a broad industrial application prospect.

The invention relates to an aqueous mixed electrolyte and an application thereof in a zinc ion mixed supercapacitor. The invention discloses a mixed electrolyte taking organic zinc salt as a solute and water and ethylene glycol as solvents. The mixed electrolyte has ionic conductivity equivalent to that of an aqueous solution and a lower freezing point (less than -20 DEG C). The ethylene glycol interacts with anions in the organic zinc salt, so that the solvation state of zinc ions in the mixed electrolyte is changed, the electron cloud density of hydrogen in the zinc ion hydration structure is reduced, the hydrogen evolution reaction is effectively inhibited, the potential window of the hydrogen evolution reaction is widened, and the influence of gas production of the aqueous battery on the cycling stability is relieved. The adsorption effect of zinc ions on the surface of the activated carbon is enhanced, a faster and more efficient adsorption and desorption reaction can occur on the surface of the activated carbon, and the specific capacity of the hybrid supercapacitor is improved. The introduction of ethylene glycol and the organic zinc salt can greatly improve the conductivity of the mixed electrolyte at low temperature, thereby improving the power density of the hybrid supercapacitor at low temperature, and further widening the working temperature and application range of the hybrid supercapacitor.

The invention discloses a method for constructing a type III collagen photoelectrochemical sensor based on a rhenium disulfide nanosheet and an application. The method comprises the following steps offirstly, preparing 1-butyl-3-dodecyl imidazole bromide salt ionic liquid; taking the ionic liquid as an auxiliary reagent; successfully manufacturing a rhenium disulfide two-dimensional lamellar nano-material by using probe ultrasonic stripping; and constructing the type III collagen photoelectrochemical sensor on the basis of a rhenium disulfide nano-sheet modified electrode and loading of a type III collagen antibody, and realizing specific detection of type III collagen by taking white light as an excitation light source. In the invention, the ionic liquid is used as a stripping agent to be inserted into or attached to a nano lamellar structure of rhenium disulfide so that rhenium disulfide nanosheet agglomeration can be effectively avoided, and stripping efficiency is improved; and rhenium disulfide belongs to a direct band gap material, and has a better photoelectric property than other transition metal disulphides so that high-selectivity and high-sensitivity analysis of the type III collagen is realized.