30results about How to "Increased maximum power density" patented technology

The invention discloses preparation and application of a graphene / substrate electrode and a polyaniline-graphene / substrate electrode and belongs to the technical field of electrodes. The preparation comprises the following steps of: dispensing a graphene oxide aqueous solution on a substrate; reducing a graphene oxide / substrate electrode by employing a three-electrode system and cyclic voltammetry to obtain the graphene / substrate electrode; soaking the graphene / substrate electrode in a polyaniline aqueous solution; and taking out and drying to obtain the polyaniline-graphene / substrate electrode. The method is simple in process, convenient, rapid, green and free from pollution, and the power output of a microbial fuel cell can be obviously improved.

The invention discloses a microbial fuel cell for processing acid copper-containing waste water of mine, and a copper recycling method. Processing of the acid copper-containing waste water of mine bythe microbial fuel cell comprises the following three steps (1) enrichment of a positive electrode electrochemical active microorganism: dewatered sludge is a positive electrode inoculum, and a culture domestication liquid taking sucrose as the main part is added for performing domestication for seven days to obtain a positive electrode culture; the main components of a positive electrode substrate comprise residual sludge, glucose and the like; and the volume ratio of the positive electrode culture to the substrate is 1:1 to 1:4; (2) establishment of an MFC system: the effective volume of theMFC is 100-250mL; the spacing between a positive electrode carbon brush and a negative electrode carbon brush is 4-6cm; and after the output voltage of the MFC reaches 400-600mV, a positive electrodestirring apparatus is started at the rotary speed of 450-550r / min and at the maximum power density of 580.8mW / m<2>; and (3) processing of the acid copper-containing waste water of mine and copper recycling in a negative electrode room: a negative electrode is taken out after operation for 25-30 days; a negative electrode reduction product is collected, and detection proves that the product is elementary copper; after the reaction, the negative electrode liquid is 6.5-6.9 in pH value; and negative electrode Cu<2+> removal ratio is 92.2%.

A reverse electrodialysis device, including an anode, a cathode, one or more single cells spaced apart from each other between the anode and the cathode, each single cell including a cation exchange membrane and an anion exchange membrane, and a shielding membrane disposed to define spaces between the anode and the single cell and / or between the cathode and the single cell. The cation exchange membrane and the shielding membrane include a porous polymer substrate and a polymer electrolyte incorporated into pores in the substrate.

The invention discloses a CO2 mineralizing power generation method using sodium bicarbonate as an alkaline leaching agent, a battery is divided into a positive electrode zone and a negative electrode zone by a cation exchange membrane, the negative electrode zone contains a supporting electrolyte, the positive electrode zone contains a leaching solution formed by alkaline solid waste and the sodium bicarbonate, after a conductive path is formed by a positive electrode and a negative electrode, CO2 is introduced into the negative electrode for ionization into H<+> and HCO3<->, the H<+> is reduced into H2, the H2 is recycled back to the positive electrode, and oxidized into the H<+>, the H<+> and OH<-> of a positive electrode liquid are neutralized, and the sodium bicarbonate is generated from the HCO3<-> and Na<+> from the positive electrode zone. The sodium bicarbonate in a negative electrode liquid is continuously generated and circulated to the positive electrode zone, caustic soda is extracted, suspension is filtered and leached, filtrate is used as a positive electrode electrolyte, and the positive electrode liquid with the OH<-> consumed is recycled to the negative electrode zone. By means of heating, the CO2 mineralizing power generation method can improve the electricity production performance, is suitable for power generation of weak alkaline solid waste, can be applied to steel making industry to achieve three purposes of emission reduction, solid waste treatment and power generation, and has high practical value.

The invention relates to a fuel cell gas diffusion layer, in particular to an integrated diffusion layer and its preparation method and application. The preparation method of the present invention uses carbon fiber as the skeleton, composites multi-walled carbon nanotubes, uses nitrogen methyl pyrrolidone as the dispersant to disperse at high speed, polytetrafluoroethylene (PTFE) as the binder and water-repellent agent, and adopts vacuum suction filtration molding method A new one-piece diffusion layer is made in one step. The integrated diffusion layer of the present invention replaces the traditional diffusion layer composed of carbon paper and microporous layer, and when it is applied to the cathode of a direct methanol fuel cell or as the cathode and anode diffusion layer at the same time, the maximum power density of a single cell is compared with that of a commercial diffusion layer. Improvements of 20% and 35%, respectively. The integrated diffusion layer of the present invention is applied to the oxygen electrode of zinc-air battery, and the maximum power density is as high as 200mA cm ‑2 , which also provides a potential direction for the exploration of new diffusion layer processes and materials with high performance and low cost for fuel cells.

A kind of nickel-cobalt binary catalyst that promotes the direct oxidation of sodium borohydride is characterized in that: (1) under normal temperature and pressure, prepare 0.2mol / dm 3 nickel chloride (NiCl 2 ·6H 2 O), 0.0000~0.0300mol / dm 3 Cobalt Chloride (CoCl 2 ·6H 2 O) and 4mol / dm 3 Ammonium chloride (NH 4 The mixed solution of Cl) is an electrodeposition solution; (2) Assembling a two-electrode system: a 1cm×2cm polished Ni sheet is placed in the above solution as a cathode, wherein the working area of ​​the Ni sheet is 1cm×1cm, and a carbon rod (3) Using the constant current method, in a constant temperature water bath at 298.15K, with a deposition current of 2A, and a deposition time of 20s, deposit Ni and Co on the above smooth Ni sheet. The nickel-cobalt catalyst prepared by electrodeposition has a porous structure, and the addition of cobalt makes the catalyst have a larger average pore size and porosity, which significantly increases the specific surface area, increases the number of catalytic active sites, and reduces the resistance to be overcome in the direct oxidation reaction. The charge transfer of the electrode reaction is enhanced; at the same time, the discharge potential of the fuel is reduced, the discharge efficiency of the fuel is significantly improved, and the oxidation performance of the fuel is improved.

The invention provides a high power density molten carbonate direct coal / carbon fuel cell, comprising a battery body and a heating furnace for heating the battery body, a working electrode, a counter electrode and a reference electrode are installed in the battery body, the The working electrode includes an anode chamber, a pick-and-place rod is inserted into the anode chamber, and a flow hole is opened on the anode chamber to communicate with the electrolyte in the inner cavity of the battery. The anode chamber is filled with coal / carbon fuel, and the coal / carbon fuel A current collector is buried, and the current collector is led out through a high-temperature resistant insulated wire; the composition of the coal / carbon fuel includes at least transition metal oxide and carbon powder. The invention adds certain transition metal oxides to the anode chamber to act as a catalyst, effectively promotes the electro-oxidation reaction of the anode, improves the performance of the anode, and further effectively improves the power density of the fuel cell.

The invention provides a biomass-based activated carbon coated iron carbide three-dimensional porous microbial fuel cell anode material, which is composed of biomass-based activated carbon and iron carbide, wherein iron carbide is distributed in the biomass-based activated carbon and is coated by the biomass-based activated carbon to form micron-sized activated carbon-coated iron carbide particles, and the anode material has a three-dimensional porous network structure consisting of micron and nano composite holes. The invention also provides a microbial fuel cell anode based on the anode material, and preparation methods of the anode material and the anode. According to the invention, the problems of unfavorable attached growth of microorganisms and high modification cost of the existingmodified three-dimensional carbon-based electrode are solved, and the attached growth of an anode biological membrane can be promoted and the electron transfer of an extracellular interface can be accelerated while the cost of the microbial fuel anode is reduced.

The invention discloses a millimeter-wave dual reflector antenna capable of focusing a near-field wave beam. The antenna comprises a main reflector, an auxiliary reflector and a feed source, wherein a wave beam emitted by the feed source is reflected by the auxiliary reflector to the main reflector, and then emitted; a curved surface of the main reflector is a revolution paraboloid; and a central point of the main reflector is located at an intersection point of an emitting central axis of the auxiliary reflector and an axis of a radiation wave beam. The antenna is simple in structure and mature to process; the power density of a near-field region axis of the antenna is improved; the maximum power density of the axis is improved greatly under the same input power; a distance range of an effective power threshold is expanded; the efficiency of the antenna is improved; and a near-field gain of the antenna is increased.

The invention provides a composite anode of a direct-methanol fuel cell and a manufacturing method thereof. The invention is characterized in that the composite anode is composed of a supporting layer, a diffusion layer and a catalyzing layer, wherein, the diffusion layer is the structure of a network channel which is composed of carbon nano-tubes. The typical characteristics of the preparation process are that: (1) a certain amount of the carbon nano-tubes or the carbon nano-tubes added with a certain amount of other carbon materials are dispersed in isopropanol aqueous solution to obtain a sizing agent (A); (2) a certain amount of polyfluortetraethylene latex is added into the (A) and evenly dispersed to form serosity (B); (3) the (B) is evenly coated on the supporting layer, and the diffusion layer (C) loaded by the supporting layer is formed after 300-350 DEG C high-temperature roasting; (4) the (C) is coated with a layer of PtRu catalyst and then heat pressed with a cathode and aNafion membrane to obtain a membrane electrode aggregation (MEA). Therefore, the transmission efficiency of the fuel at the anode is improved and the internal resistance of the battery is reduced so as to enhance the power density and service life of the battery.

The invention discloses a preparation method and application of a sludge carbon plate electrode. The preparation method comprises the steps of uniformly mixing smashed wood flour and dried sludge powder at certain weight ratio, pouring the mixture into a mold, adding with a certain amount of moisture, grinding and shaping; and taking out, drying, and carrying out high-temperature gradient anaerobic carbonization to obtain a sludge carbon plate electrode material. According to the prepared electrode material, waste sludge in a sewage plant and discarded biomass wood flour are used as raw materials, the cost is low, the preparation method is simple and rapid, and the method can provide a new way for the sludge resourced technology. The sludge carbon plate electrode can be applied to a microbial fuel cell, and compared with the traditional graphite electrode, the sludge carbon plate electrode has the power density of the battery, which is improved nearly twice.

The invention discloses a novel proton blocking composite cathode material and its preparation method and application. The molecular formula of the cathode material is (1‑x)PrBa 0.5 Sr 0.5 Cu 2 o 5‑δ ‑xCe 0.8 SM 0.2 o 2‑δ , wherein, x=0.1~0.5. The novel proton-blocking composite cathode material provided by the present invention can be used as a cathode material for a fuel cell. Due to the use of the PBSC-SDC composite cathode material, the prepared single cell not only has a higher open circuit voltage and a lower polarization resistance, Can output higher maximum power density. It also has good thermal matching, which helps to improve the thermal stability of the single cell.

The invention discloses a CO2 mineralizing power generation method using sodium bicarbonate as an alkaline leaching agent, a battery is divided into a positive electrode zone and a negative electrode zone by a cation exchange membrane, the negative electrode zone contains a supporting electrolyte, the positive electrode zone contains a leaching solution formed by alkaline solid waste and the sodium bicarbonate, after a conductive path is formed by a positive electrode and a negative electrode, CO2 is introduced into the negative electrode for ionization into H<+> and HCO3<->, the H<+> is reduced into H2, the H2 is recycled back to the positive electrode, and oxidized into the H<+>, the H<+> and OH<-> of a positive electrode liquid are neutralized, and the sodium bicarbonate is generated from the HCO3<-> and Na<+> from the positive electrode zone. The sodium bicarbonate in a negative electrode liquid is continuously generated and circulated to the positive electrode zone, caustic soda is extracted, suspension is filtered and leached, filtrate is used as a positive electrode electrolyte, and the positive electrode liquid with the OH<-> consumed is recycled to the negative electrode zone. By means of heating, the CO2 mineralizing power generation method can improve the electricity production performance, is suitable for power generation of weak alkaline solid waste, can be applied to steel making industry to achieve three purposes of emission reduction, solid waste treatment and power generation, and has high practical value.

The invention discloses a preparation method of a waste bacterial rod carbon anode and application thereof in a microbial fuel cell. Compared with a traditional carbon brush anode, the maximum power density of the waste bacterial rod carbon anode can be improved by more than one time; the preparation method of the waste bacterial rod carbon anode is simple, a complex hydrochloric acid immersion cleaning step is omitted, the cost of raw materials is low, the waste bacterial rod carbon anode is suitable for large-scale commercial process, and a bran-new application mode is provided for resource utilization of waste bacterial rods.