81results about How to "Improve electrochemical reactivity" patented technology

The invention provides an electrode for a vanadium battery, comprising a carbon basal body and a carbon nano-tube layer formed on the surface of the basal body, wherein the carbon basal body is selected from a graphite felt, a carbon felt, a carbon paper and carbon cloth. The invention also provides an all-vanadium redox flow battery containing the electrode. The electrode has improved electrochemical activity and reliable mechanical strength.

The invention provides a bipolar plate of a proton exchange membrane fuel cell. The bipolar plate of the proton exchange membrane fuel cell is formed by combining a positive pole single plate and a negative pole single plate; a positive pole flow field is arranged on the outer side of the positive pole single plate; a negative pole flow field is arranged on the outer side of the negative pole single plate; and a coolant flow field is formed by a cavity between the positive pole single plate and the negative pole single plate. A positive pole inlet and a positive pole outlet are formed in the left and right sides of the bipolar plate of the proton exchange membrane fuel cell, and a negative pole inlet and a negative pole outlet are formed in the left and right sides of the bipolar plate ofthe proton exchange membrane fuel cell; a coolant inlet and a coolant outlet are formed in the upper and lower sides of the bipolar plate of the proton exchange membrane fuel cell; and the positive pole inlet and the negative pole inlet are formed in the left and right sides of the polar plate of the proton exchange membrane fuel cell. Vertical cross flow of a coolant and negative pole gas and positive pole gas is realized, and then the electrochemical reaction activity of the bipolar plate of the proton exchange membrane fuel cell is improved, and preferable heat management is realized.

The invention discloses a preparation method of a lithium-sulfur battery cathode material based on a phosphorus-doped graphene supported nickel phosphide material. The method comprises the following steps: (1) adding a surface active agent into graphene oxide to obtain graphene oxide dispersion liquid; (2) adding a nickel source and alkali liquor into distilled water to obtain a saline solution; (3) adding the saline solution into the graphene oxide dispersion liquid, carrying out a hydrothermal reaction, then washing, and carrying out freeze drying to obtain a graphene composite material loaded with a nickel precursor; (4) enabling the graphene composite material loaded with the nickel precursor to be subjected to a phosphating reaction so as to obtain the phosphorus-doped graphene supported nickel phosphide material; (5) compounding the phosphorus-doped graphene supported nickel phosphide material with sublimed sulfur to obtain the lithium-sulfur battery cathode material based on thephosphorus-doped graphene supported nickel phosphide material. The phosphorus-doped graphene supported nickel phosphide material prepared by the method has a three-dimensional space structure, thus having an obvious domain limiting effect on sulfur and remarkably inhibiting the shuttle effect of lithium polysulfide.

The invention provides a vanadium battery positive electrode electrolyte which comprises VOSO4 and H2SO4. The vanadium battery anode electrolyte is characterized by also comprising an additive selected from a group comprising free carbamidine, thiazole and sulfonamide. The anode electrolyte can obviously improve the reactive activity of a positive electrode of the vanadium battery.

The invention relates to a method for preparing tin-nickel alloy of cathode materials of a lithium ion battery by electrolyzing melted salt. The method comprises the following steps: uniformly mixing oxides of tin and nickel, sintering to obtain a sinter cake after slurry-casting or pressing shaping, compounding the sinter cake with a conductive current collector into a cathode, using graphite as an anode, using mixed electrolyte of CaCl2 or CaCl2, NaCl as a melt; controlling electrolysis voltage not to be less than theoretical decomposition voltage of the melted salt, controlling electrolysis temperature at 550-850 DEG C, protecting electrolysis process by inert gases, and preparing the tin-nickel alloy with Sn/Ni atom ratio of 4:3-1:3. The invention has short production process, low energy consumption, little pollution and easy continuous production; and the prepared tin-nickel alloy of the cathode materials of the lithium ion battery has high specific capacity and stable circulation property.

The invention provides a method for preparing micro-porous carbon-structural electrode material from plant materials and application of the micro-porous carbon-structural electrode material and belongs to the field of new-generation energy storage. The method includes the steps of firstly, frequently boiling water and ethyl alcohol mixture containing cellulose-enriched plants to remove proteins, fats, sucrose organics; secondly, heating and drying and then subjecting the mixture to high-temperature calcination in atmosphere of protective gases, cooling naturally to obtain a micro-porous carbon-structural material; thirdly, putting the micro-porous carbon-structural material in mixed solution of sulfuric acid and nitric acid while stirring continuously for 10-20 minutes to achieve surface functionalization. According to the method, the cellulose-enriched plant residues are utilized for preparing the electrode material for the first time, acid solution can be recycled, the whole preparation is simple and free of pollution, the method can be applied to production in scale, and the prepared electrode material has excellent performance which is similar to the lithium-ion storage performance of graphene material, has high practicable value, and has potential to substitute for the commercial graphite to serve as the novel lithium-ion battery electrode material.

The invention provides a cobalt phosphide molybdenum particle modified nitrogen-phosphorus co-doped carbon composite material and a preparation method and application thereof, which belong to the technical field of electrochemistry and new energy. The cobalt phosphide molybdenum particle modified nitrogen-phosphorus co-doped carbon composite material is formed by stacking carbon materials, so thata large number of three-dimensional spaces are formed; the cobalt phosphide molybdenum particles are embedded in a carbon matrix, and the size of the cobalt phosphide molybdenum particles is nanoscale. The cobalt molybdenum phosphide has a large number of electrochemical active sites, is excellent in conductivity, and can promote electrochemical reaction and improve the performance of the lithiumion battery. Besides, the nitrogen-phosphorus co-doped carbon material is good in conductivity, a large number of three-dimensional spaces are generated by mutual stacking, the volume change in the process of battery reaction can be effectively alleviated, and the service life of the battery is improved; the preparation method is simple, cheap and efficient, batch production and commercial application of the bimetal phosphide material can be promoted, and therefore good practical application value is achieved.

The invention discloses a proton exchange membrane fuel cell membrane electrode electrocatalyst and a preparation method thereof. The electrocatalyst is prepared through the method including the steps of adding graphene oxide powder to polyhydric alcohols, conducting ultrasonic dispersing to obtain a graphene oxide alcohol solution, putting a chloroplatinic acid water solution to polyhydric alcohols to obtain a chloroplatinic acid alcohol solution, mixing the prepared graphene oxide alcohol solution and the chloroplatinic acid alcohol solution, adding aqueous alkali to the prepared mixed solution to adjust the pH to be 8-12, transferring the materials into a microwave reaction still, heating the materials to 80-180 DEG C at the microwave power of 180-250 W for reaction for 5-25 min, cooling reaction liquid, conducting vacuum filtering, alternately washing a filter cake with organic solvent and deionized water till the pH of filtrate is neutral, and drying the filter cake till the weight is constant to obtain the Pt/graphene electrocatalyst. The electrocatalyst prevents particle aggregation and is small in granularity, the high-dispersity electrocatalyst is high in catalytic activity, and the utilization rate of the electrocatalyst is increased.

The invention discloses a preparation method and application of a double-carbon-layer-protected bismuth nanoparticle composite material, and the preparation method comprises the following steps: S1, dispersing a bismuth source and an organic ligand in an organic solvent to obtain a uniform solution; s2, taking the uniform solution, and carrying out hydrothermal reaction to generate a Bi MOF precursor; s3, dispersing the Bi MOF precursor obtained in the step S3 into a Tris buffer solution, adding dopamine hydrochloride under violent stirring, and continuously stirring to obtain Bi MOF (at) PDA; and S4, respectively putting the Bi MOF (at) PDA obtained in the step S4 and a nitrogen-containing pore-forming agent into two quartz boats, and carrying out carbon thermal reduction treatment, so as to obtain the double-carbon-layer protected bismuth nanoparticle composite material. The overall synthesis method is simple, the utilization rate of active substances is high, the electrode material structure is stable, the number of active sites is large, and the rate and cycling stability of the potassium ion battery are better improved.

The invention discloses a high-entropy alloy/carbon nanotube modified lithium carbon fluoride battery positive plate and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing a high-entropy alloy/carbon nanotube composite material; step 2, weighing 70%-90% of carbon fluoride, 5%-20% of the high-entropy alloy/carbon nanotube composite material and 5%-10% of a binder in percentage by mass, grinding and uniformly mixing, then adding a solvent, and uniformly stirring to obtain positive electrode slurry with flowability; and step 3, uniformly coating an aluminum foil or a carbon-coated aluminum foil with the positive electrode slurry by using a film coating device, and carrying out vacuum drying to remove the solvent to obtain the high-entropy alloy/carbon nanotube modified lithium carbon fluoride battery positive electrode plate. The invention also provides a lithium carbon fluoride battery. The lithium carbon fluoride battery comprises an electrolyte, a diaphragm, a negative plate and the high-entropy alloy/carbon nanotube modified lithium carbon fluoride battery positive plate. The prepared positive plate can improve the conductivity and rate capability of the lithium carbon fluoride battery, and improve the specific energy and storage performance of the battery.

Provided is a method for manufacturing an anode of a cable-type secondary battery having a solid electrolyte layer, including preparing an aqueous solution of an anode active material, making an anode by immersing a core as a current collector having a horizontal cross section of a predetermined shape and extending longitudinally in the aqueous solution, then applying an electric current to form a porous shell of the anode active material on the surface of the core, and forming a solid electrolyte layer on the surface of the anode by passing the anode through a solid electrolyte solution. The anode has a high contact area to increase the mobility of lithium ions, thereby improving battery performance. Also, the anode is capable of relieving stress and pressure in the battery, such as volume expansion during charging and discharging, thereby preventing battery deformation and ensuring battery stability.

The invention relates to a cobalt-based complex catalyst for a direct methanol fuel cell anode,and a preparation method thereof, wherein a polyvinyl alcohol-polyaniline conductive hydrogel treated with a weakly alkali is as a carrier, and is soaked in a soluble cobalt salt, and calcining is performed in an inert atmosphere to obtain an elemental cobalt nanocrystalline composite material wrapped bya nitrogen-containing carbon material and having elemental cobalt content of 2-6 wt%. According to the invention, a brand-new catalyst carrier loaded transition metal cobalt is adopted to replace traditional precious metals, and the electronic structure of the catalyst is regulated and controlled by doping heteroatoms, so that the catalytic activity and the electrode conductivity of the catalystare improved, and the catalyst has excellent electrochemical reaction activity.

The invention provides a magnetic quantum dot molecular imprinting material used for detecting bisphenol A and application, and belongs to the technical field of analytic sensing. An electrochemiluminescence sensor of a molecular imprinting compound based on doping of a magnetic material and quantum dots is disclosed, and precise detection of an environmental hormone bisphenol A is achieved by utilizing the specific recognition effect of a molecular imprinting technique, the efficient separating and electrode modification effect of a magnetic composite structure and the high-sensitivity response of electrochemiluminescence signals of the quantum dots to bisphenol A, wherein the concentration detection range of bisphenol A is from 1*10<-9> M to 1*10<-4> M, and the detection limit is 3.4*10<-10> M. The sensor is high in sensitivity and selectivity, convenient to operate, good in stability, high in reproducibility and the like, and a novel and effective method is provided for the detection of environment hormones of industrial water, rivers and the like, and has a significant application prospect.

The invention provides a multi-wall carbon nanotube/poly L-histidine composite material-modified glassy carbon electrode, which comprises a glassy carbon electrode, wherein poly L-histidine and a multi-wall carbon nanotube are sequentially deposited on the surface of the glassy carbon electrode. The multi-wall carbon nanotube/poly L-histidine composite material-modified glassy carbon electrode has electrocatalytic activity, small impedance and good conductivity and has a good application prospect. The invention further provides a preparation method of the multi-wall carbon nanotube/poly L-histidine composite material-modified glassy carbon electrode. The method is mild in condition, easy to control and suitable for massive production.

The invention discloses a graphene-loaded vanadium pentoxide composite material, a preparation method thereof and application of the graphene-loaded vanadium pentoxide composite material in an aqueous zinc ion battery. The graphene-loaded vanadium pentoxide composite material is formed by in-situ growth of porous vanadium pentoxide nanosheets on the surface and between layers of layered graphene, the preparation method comprises the following steps: uniformly mixing a vanadium source, terephthalic acid and a graphene dispersion liquid, transferring into a high-pressure reaction kettle, and carrying out solvothermal reaction to obtain a V-MOF (at) graphene precursor; the V-MOF (at) graphene precursor is subjected to pyrolysis treatment to obtain the graphene-loaded vanadium pentoxide composite material with good conductivity, high structural stability and high electrochemical activity, the graphene-loaded vanadium pentoxide composite material is used as a positive electrode active material of the aqueous zinc ion battery, and the obtained aqueous zinc ion battery has excellent cycle performance and ultrahigh reversible specific capacity.

The invention relates to the field of lithium ion batteries and discloses a lithium iron phosphate power lithium-ion battery. A positive electrode material is prepared from, by weight, 94-96 parts oflithium iron phosphate, 3-5 parts of a positive electrode conductive agent, 1-3 parts of a positive electrode adhesive and 10-20 parts of a dissolving agent. A negative electrode material is preparedfrom, by weight, 94-96 parts of a negative electrode granular material, 0.9-1.2 parts of a negative electrode conductive agent, 2-2.4 parts of a thickening agent and 2-2.4 parts of a negative electrode adhesive. The negative electrode granular material has a core-shell structure, artificial graphite serves as a core material, and amorphous carbon serves as a shell material. The positive electrodematerial and the negative electrode material are well matched, and the negative electrode material is low in granularity, high in uniformity and attachment on copper foils and low in contact internalresistance. After the positive electrode material and the negative electrode material are made into the lithium ion batteries, internal resistance of the batteries can be reduced while low-temperatureperformance, high-temperature performance and cycle performance of the batteries can be improved.