24 results about "Direct methanol fuel cell" patented technology

The application belongs to the technical field of new energy materials and electrochemical catalysis, and provides an oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst, a preparation method and application thereof. A foam nickel is used as a working electrode, a platinum sheet is used as a counter electrode, and a Hg / HgO electrode is used as a reference electrode. In an electrolyte solution containing a nickel salt and a cerium salt, electrodeposition is performed to obtain a precursor. The precursor includes the foam nickel and cerium and nickel deposited on the foam nickel. The precursor is soaked in a tannic acid solution to obtain an impregnated precursor. Ammonium hypophosphite is placed upstream, and the impregnated precursor placed downstream is subjected to phosphorus nitride doping treatment to obtain the oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst. The obtained oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst exhibits excellent electrocatalytic performance for methanol oxidation reaction (MOR) and can be used as a high-efficiency anode catalyst for a direct methanol fuel cell (DMFC).

The invention belongs to the field of fuel cells, and provides a numerical simulation optimization method and system for a direct methanol fuel cell, and the method comprises the steps: determining a flow field geometric structure which is set as a snakelike topological path formed by continuous multiple sections of turn-back units; and determining the initial methanol permeation current density, and performing dynamic iteration on the initial methanol permeation current density to determine the real-time permeation current density of methanol diffusion in the flow field geometric structure. A dynamic permeation current density iterative algorithm is provided, electrochemical reaction and mass transfer processes are coupled in real time, permeation current density is updated in real time and coupled to cathode overpotential calculation, permeation current prediction errors are reduced to below 0.78%, and compared with the prior art, the precision is improved by more than 6 times.

The application belongs to the technical field of electrochemical catalyst materials, and particularly relates to a method for preparing a Pt-N-C catalyst by using a nitrogen doping strategy and application. The method uses preparation of emeraldine base polyaniline (EB-PANI), and a precursor is complexed in the EB-PANI chain in a coordination form, and then the complex is subjected to a high-temperature carbonization reaction to obtain a fibrous Pt-N-C catalyst. The application enhances the binding force between Pt and the substrate by using the nitrogen-doped carbon strategy, and simultaneously dopes N into the Pt nanolattice, so that the prepared Pt-N-C catalyst has significantly improved oxygen reduction reaction catalytic activity and stability, and has certain practical value for improving the performance of a direct methanol fuel cell.

The application discloses a method for synthesizing Au-Pt nanowire arrays by an electrochemical deposition method on carbon paper with aniline as a ligand and application thereof, and can be applied to methanol electro-oxidation reaction. After growing gold nanowire arrays on a conductive substrate by using an electrochemical deposition method with aniline as a ligand, Au-Pt nanowires are synthesized by a secondary electro-deposition mode. The electrochemical deposition has controllable reduction capacity, convenient operation and environmental friendliness. The combination of gold nanowires and platinum (Pt) can significantly improve the activity of a catalyst. The diameter of gold-platinum nanowires prepared by the electrochemical deposition method assisted by an aniline ligand can reach 30 nanometers. The increase in the size is helpful to expand the electrochemical active surface area, thereby enhancing the electron transmission efficiency and further improving the electro-catalytic performance. The gold nanowires are integrated into platinum-based nanomaterials, and for an anode catalyst of a direct methanol fuel cell, the gold nanowires can significantly improve the catalytic efficiency of a methanol oxidation reaction.

The utility model discloses a methanol-water concentration proportioning system based on membrane permeation, which relates to the technical field of direct methanol fuel cells, and comprises a diaphragm liquid mixing tank, the diaphragm liquid mixing tank comprises a first end plate, a proton exchange membrane and a second end plate, the side surface of the first end plate is provided with a methanol cavity, the side surface of the second end plate is provided with a water mixing cavity, and the proton exchange membrane is arranged in the water mixing cavity. The proton exchange membrane is clamped between the first end plate and the second end plate and divides the methanol cavity and the water mixing cavity into two sides, and methanol in the methanol cavity can permeate into the water mixing cavity through the proton exchange membrane. According to the mechanism that the proton exchange membrane allows methanol molecules to diffuse due to a hydrophilic channel, so that the methanol permeability is high, the interior of the diaphragm liquid mixing tank is divided into the methanol cavity and the water mixing cavity through the proton exchange membrane, and part of methanol on the side of the methanol cavity permeates into the water mixing cavity through the proton exchange membrane; the methanol water concentration required by the direct methanol fuel cell is directly prepared, the operation is simple, and the methanol water concentration is easy to control.

The invention relates to the technical field of fuel cell low-temperature starting control, in particular to a direct methanol fuel cell (DMFC) power station rapid low-temperature starting system and method. The system comprises a main controller, a methanol supply subsystem, an electric pile, a lithium battery heating subsystem and a temperature detection subsystem. The main controller constructs a thermal state vector and predicts temperature change based on a discrete thermal network model, the optimal heat supply power meeting energy budget and thermal safety constraint is solved in a prediction window, the optimal heat supply power is mapped into pulse frequency, duty ratio and heat supply routing variables, and partition heat supply of the methanol hot area and the electric pile hot area is achieved; and meanwhile, the lithium battery pack is subjected to self-preheating under the low-temperature condition, and pipeline freezing and air blocking are prevented through emptying and reperfusion closed-loop control. Smooth temperature rise and accurate power distribution can be achieved in the low-temperature environment, starting energy consumption and battery impact are reduced, the safety of the electric pile and the starting success rate are improved, and the method is suitable for reliable operation of a power station-level DMFC system.

The invention provides a platinum-bismuth alloy catalyst, a preparation method thereof and a direct methanol fuel cell, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: mixing carbon black with an acidic aqueous solution, and sequentially carrying out acidizing treatment and roasting treatment to obtain pretreated carbon black; mixing the pretreated carbon black, Bi2O2CO3, a platinum source, a precipitant, a pH regulator, a first dispersing agent and first water, and performing replacement reaction to obtain a suspension; mixing a reducing agent, a second dispersing agent and second water to obtain a mixed solution; dropwise adding the suspension into the mixed solution for reduction reaction to obtain a catalyst precursor; and calcining the catalyst precursor under first protective gas to obtain the platinum-bismuth alloy catalyst. The prepared platinum-bismuth alloy catalyst has excellent electro-catalytic performance, shows relatively high catalytic activity and cycling stability, and can be applied to oxygen reduction reaction of a cathode of a direct methanol fuel cell.

The application relates to a direct methanol fuel cell module, which comprises an anode end plate, a cell array and a cathode end plate arranged in sequence, the side of the anode end plate facing the cell array is provided with a fuel flow channel groove, the cell array comprises a substrate and a plurality of cell units, the substrate is provided with a plurality of mounting through holes and a plurality of first circuit through holes, each cell unit comprises an anode current collector, a membrane electrode and a cathode current collector arranged in sequence, each membrane electrode is embedded in a mounting through hole in a corresponding mode, and the anode side of the membrane electrode faces the anode end plate, a conductor is arranged in the first circuit through hole, and the two ends of the conductor are connected with the anode current collector and the cathode current collector of different cell units respectively, so that the plurality of cell units are connected in series. The application realizes the series connection between the cell units and is easy to integrate, and the applicability of the direct methanol fuel cell in the field of portable electronic devices is effectively improved.

The invention relates to a direct methanol fuel cell membrane electrode structure based on a transfer printing method and a preparation method of the direct methanol fuel cell membrane electrode structure. The anode catalyst layer is attached to one side of the proton exchange membrane, and the anode gas diffusion layer is hot-pressed on the outer side of the anode catalyst layer; the cathode catalyst layer is attached to the other side of the proton exchange membrane; and the cathode gas diffusion layer is hot-pressed on the outer side of the cathode catalyst layer.

The invention discloses an acid-base synergistic proton exchange membrane for a direct methanol fuel cell and a preparation method, and belongs to the technical field of materials. The preparation method comprises the following steps: blending a polyvinyl alcohol solution and a chitosan solution, adding a cross-linking agent 2-phosphonobutane-1, 2, 4-tricarboxyl, preparing a membrane, and heating and cross-linking again to prepare the acid-base synergistic proton exchange membrane for the direct methanol fuel cell. The invention also discloses the acid-base synergistic proton exchange membrane for the direct methanol fuel cell, which is prepared by the method. The number of acid-base pairs in the membrane is controlled through ingenious material selection and structural design, and the novel composite membrane which is excellent in proton conductivity, methanol barrier property, mechanical strength, dimensional stability and the like is prepared through a one-step method. And a new choice with important application value is provided for proton exchange membrane materials in the fields of direct methanol fuel cells and the like.

The application provides a high-entropy intermetallic compound bifunctional catalyst and a preparation method and application thereof, and belongs to the technical field of energy materials. The high-entropy intermetallic compound bifunctional catalyst is prepared by combining a wet chemical synthesis method with a controllable annealing process. The catalyst has carbon-supported platinum-cobalt-copper-tungsten-molybdenum quinary high-entropy alloy nanoparticles. The alloy nanoparticles have high-entropy effect and ordered structure at the same time. The particle size is 4-7 nm, and the molar ratio of metal atoms is platinum: cobalt: copper: tungsten: molybdenum = 4: (1.75-2.5): (1.75-2.5): (0.01-0.5): (0.01-0.5). The platinum loading in the catalyst is 20-70 wt%, and the catalyst is used for catalyzing oxygen reduction reaction in a cathode of a hydrogen fuel cell and / or catalyzing methanol oxidation reaction in an anode of a direct methanol fuel cell. The half-wave potential of the catalyst in an acidic medium is more than 30 mV higher than that of a commercial Pt / C catalyst, and the methanol oxidation peak current density is 1.4-2.5 times that of a commercial Pt / C catalyst or a commercial PtRu / C catalyst.

The application discloses a Pt-CuGaO2 / C composite catalyst for an anode of a direct methanol fuel cell and a preparation method thereof; the catalyst takes a copper gallium oxide with a structure of ABO2 as a carrier of nano platinum, and the loading of the nano platinum is 5-15 wt.%; during the preparation, the copper gallium oxide carrier is synthesized by a hydrothermal method, the nano platinum is reduced by a polyol heating method, and the carbon powder is loaded by a microwave intermittent reaction method, so that the Pt-CuGaO2 / C composite direct methanol fuel cell anode catalyst with high efficiency and stability is obtained; the 5 wt.% catalyst obtains a 653.4 mA / mg Pt ‑1 mass activity, 2.53 mA / cm 2 specific activity of 25.83 m 2 A / g of electrochemical active area, and a ratio (I f / I b ) of a forward peak current density to a reverse peak current density of an index of carbon monoxide poisoning resistance is 1.50; all the catalytic activity indexes are better than those of a commercial Pt / C catalyst, and the Pt-CuGaO2 / C composite direct methanol fuel cell anode catalyst has a potential application prospect.

The invention provides a wearable miniature direct methanol fuel cell flexible array. The lithium ion battery comprises a flexible packaging layer, a plurality of cathode plate reversely-buckled single batteries and a circuit board, the negative electrode plate reversely-buckled single battery comprises a positive electrode plate, a membrane electrode, a reversely-buckled negative electrode plate and a positive electrode end plate; a through groove is formed in the center of the anode end plate, and a plurality of clamping grooves are formed in the upper end surface; the reversely-buckled cathode plate is of an integrally-formed structure and comprises a cathode plate body and extension arms with the same number as the clamping grooves. The extension arm extends into the clamping groove of the anode end plate from the outer side edge of the cathode plate body, and the anode end plate, the anode plate and the membrane electrode are wrapped by the extension arm. The contradiction between light weight and assembly pressure is solved through the reverse buckling type polar plate structure, mechanical flexibility is achieved by combining broken line wire bridging and flexible material split packaging, the sealing reliability is guaranteed through the limiting groove and the integrated pouring technology, and the flexible array makes breakthroughs in energy density, mechanical adaptability and cruising ability.

The application belongs to the technical field of electrocatalysis, and particularly relates to a single-atom modified multi-element nano-alloy catalyst preparation and methanol fuel cell application. The application first synthesizes a chromium single-atom catalyst (Cr-SAC), then uses the Cr-SAC as a carrier substrate, and uses an electrochemical deposition method to load palladium (Pd), cobalt (Co) and nickel (Ni) metal precursors, and finally obtains a single-atom modified multi-element nano-alloy catalyst PdCoNi / Cr-SAC. The single-atom modified multi-element nano-alloy catalyst synthesized by the method has good conductivity, the single atoms and the multi-element nano-alloy are uniformly distributed on the substrate, the active sites are dense, the CO poisoning resistance is strong, and the catalytic activity and stability of the methanol oxidation reaction are improved, so that the direct methanol fuel cell with the PdCoNi / Cr-SAC catalyst as the anode has super-high energy conversion efficiency and long-term operation stability.

The invention discloses a direct methanol fuel cell control system for an unmanned aerial vehicle, and belongs to the technical field of fuel cell and unmanned aerial vehicle energy management. The system comprises a direct methanol fuel cell stack, a lithium battery pack, a peripheral accessory subsystem, a power management controller and a power mixing and charging management circuit. The power mixing and charging management circuit adopts an ideal diode controller to realize ultralow-loss parallel connection and automatic seamless switching from a fuel cell and a lithium battery to a power bus; the power management controller executes a self-adaptive charging control strategy and dynamically controls charging on-off and current magnitude based on voltage and temperature multi-parameter feedback; and executing a peripheral accessory cooperative control strategy, and accurately adjusting accessory power according to the working condition of the electric pile. The problems of low efficiency, extensive charging management and high accessory energy consumption in the prior art are solved, and the endurance and reliability of the unmanned aerial vehicle and the overall efficiency of the system are remarkably improved.

The invention provides noble metal-free electro-catalyst compositions for use in acidic media, e.g., acidic electrolyte. The noble metal-free electro-catalyst compositions include non-noble metal absent of noble metal. The non-noble metal is non-noble metal oxide, and typically in the form of any configuration of a solid or hollow nano-material, e.g., nano-particles, a nanocrystalline thin film, nanorods, nanoshells, nanoflakes, nanotubes, nanoplates, nanospheres and nanowhiskers or combinations of myriad nanoscale architecture embodiments. Optionally, the noble metal-free electro-catalyst compositions include dopant, such as, but not limited to halogen. Acidic media includes oxygen reduction reaction (ORR) in proton exchange membrane (PEM) fuel cells, and direct methanol fuel cells and oxygen evolution reaction (OER) in PEM-based water electrolysis and metal air batteries, and hydrogen generation from solar energy and electricity-driven water splitting.

This invention discloses a high specific surface area palladium-copper alloy nanocatalyst, its preparation method, and its applications, belonging to the fields of nanosynthesis and fuel cell technology. Using ascorbic acid as a reducing agent, palladium and copper precursors are reduced, and a structure-directing agent is added to prepare palladium-copper alloy nanomaterials with a durian-like structure using a simple one-pot method. Due to the durian-like structure and numerous branches on the surface of the nanomaterial, it provides a higher surface area and abundant reactive sites. The introduction of copper not only effectively reduces the amount of palladium used, lowering costs, but also provides a large number of active hydroxyl radicals, promoting the reaction of the intermediate product CO. ads The material is oxidized to CO2, preventing palladium poisoning. This nanomaterial, as a catalyst, exhibits high activity, high stability, and excellent resistance to poisoning in the alkaline methanol electrocatalytic oxidation reaction. This invention shows promising application prospects in the field of direct methanol fuel cells and has development value.

The invention provides a method for preparing a surface amorphous methanol electrooxidation catalyst through electrodeposition, and belongs to the technical field of catalysts. The Pt-Ag bimetallic methanol electrooxidation catalyst prepared by the invention has a special surface amorphous structure, shows very excellent catalytic stability for methanol electrooxidation reaction, is adjustable in component and controllable in structure, can effectively give consideration to catalyst performance and production cost through systematic optimization of synthesis parameters, and is suitable for industrial production. And the practical application of the direct methanol fuel cell is facilitated. By enlarging the size of the electro-deposition substrate, the Pt-Ag bimetallic methanol electro-oxidation catalyst which is loaded by the large-size substrate and has the surface amorphous structure can be obtained, and a solid foundation is laid for subsequent large-scale application.

The invention discloses a direct methanol fuel cell fuel concentration accurate control method and system based on thermal parameter analysis, relates to the technical field of direct methanol fuel cells, develops a methanol concentration analysis and regulation method which does not need an additional sensor, is high in anti-interference capability and small in calculation amount and is adaptive to a small system, and breaks through the bottleneck of DMFC engineering application. Respectively constructing a methanol fuel cell simulation structure model and a reaction heat mathematical model; the reaction heat mathematical model is used for providing thermal simulation parameters for the methanol fuel cell simulation structure model, and the methanol fuel cell simulation structure model performs a thermal simulation test based on the thermal simulation parameters; based on a thermal simulation test, determining a corresponding relation among the fuel concentration, the temperature and the current of the methanol fuel cell; based on the determined corresponding relation among the methanol fuel concentration, the temperature and the current, accurate control over the methanol fuel cell fuel concentration is achieved through an electric quantity triggering supply strategy and a temperature dynamic correction strategy.

The utility model discloses a pure methanol supply system of a direct methanol fuel cell, which relates to the technical field of direct methanol fuel cells and comprises a pure methanol storage tank, a methanol aqueous solution storage tank, a diaphragm pump and a methanol-water liquid mixer, the methanol-water liquid mixer comprises a barrel and a fan, the fan is mounted in the barrel, and a methanol liquid inlet and a water inlet are formed in the side wall of the barrel; the diaphragm pump is arranged on a connecting pipeline between a liquid outlet of the pure methanol storage tank and a methanol liquid inlet of the cylinder body, an outlet of the cylinder body is connected with a liquid inlet of the methanol aqueous solution storage tank, and a liquid outlet of the methanol aqueous solution storage tank is connected with a methanol water liquid inlet of the direct methanol fuel cell; and a water outlet of the direct methanol fuel cell is connected with a water inlet of the barrel. The heat exchanger is used for vaporizing methanol, the diaphragm pump can feed liquid in vacuum, the conveying flow of pure methanol is easier to control, and the cost is low; water output by the cathode of the direct methanol fuel cell is circularly used as a water source and is input into the methanol-water liquid mixer to be uniformly mixed.

The invention relates to a direct methanol fuel cell stack power recovery method. The method comprises the following steps: S1, preparing a nitric acid cleaning solution with the concentration of 1.5-2.5 M; s2, acid cleaning circulation; and S3, deionized water flushing and end point judgment. According to the invention, core pain points such as unstable cleaning effect, easy membrane damage and fuzzy terminal point judgment in the prior art are solved, and reliable technical guarantee is provided for long-term stable operation of the fuel cell.

The application provides a composite gas diffusion layer, belongs to the technical field of new energy and fuel cells, and is used for a fuel cell membrane electrode, comprising a porous substrate layer and a composite microporous layer which are arranged in layers, and the porous substrate layer serves as a support body; the composite microporous layer comprises a conductive support layer and a selective screening layer, the conductive support layer is arranged on the surface of the porous substrate layer and is formed of a conductive framework of carbon nanotube networks; the selective screening layer is located on the surface of the conductive support layer away from the porous substrate layer, is formed by paving two-dimensional sheet materials and is attached to the conductive support layer, the two-dimensional sheet materials are distributed with an array of nano-pores of the order of Angstrom, and the aperture of the nano-pores is 0.35-0.8 nm. The application further provides a plurality of preparation methods of the composite gas diffusion layer and a preparation method of the fuel cell membrane electrode. The application can solve the technical problems of poor barrier effect of the membrane electrode on fuel penetration and low proton conductivity in proton exchange membrane fuel cells and direct methanol fuel cells.

The invention relates to an anode filter for a direct methanol fuel cell, which comprises an upper cavity, the main body of the upper cavity is of a cylindrical structure, the upper cavity of the cylindrical structure is of a hollow structure, and a resin filter bag, a filter paper pressing sheet and filter paper are sequentially embedded in the upper cavity of the hollow structure from inside to outside; the outer diameter of the resin filter bag, the outer diameter of the filter paper pressing piece and the outer diameter of the filter paper are matched with the inner diameter of an upper cavity of a hollow structure, one side of the upper cavity is connected with a protruding upper infusion connector communicated with the upper cavity, the other side of the upper cavity is connected with a lower sealing cover, and the lower sealing cover is connected with a protruding lower infusion connector communicated with the upper cavity. According to the invention, the interface bonding and base material swelling resistance can be improved, the long-period service life of the filter is prolonged, and the cost can be reduced by adopting low-cost materials and an integrated process.

The invention discloses a direct methanol fuel cell catalyst and a preparation method thereof, the structural unit of the direct methanol fuel cell catalyst takes a vertical orientation carbon nanotube as a conductive network, and a platinum-iron-cobalt-nickel-copper high-entropy alloy is loaded on the conductive network, and the preparation method of the direct methanol fuel cell catalyst specifically comprises the following steps: S1, preparing a vertical orientation growth carbon nanotube; s2, carrying an iron-cobalt-nickel-copper nanosheet through a hydrothermal reaction to obtain an iron-cobalt-nickel-copper hydroxide vertical orientation carbon nanotube; s3, soaking the obtained iron-cobalt-nickel-copper hydroxide and vertical orientation carbon nanotubes in a chloroplatinic acid solution to load platinum ions; and S4, in an argon-hydrogen atmosphere, carrying out plasma reduction treatment on the iron-cobalt-nickel-copper hydroxide vertical orientation nanotube soaked in the chloroplatinic acid solution by using a radio frequency plasma technology to obtain the direct methanol fuel cell catalyst, and the direct methanol fuel cell catalyst has the characteristics of high specific surface area, multiple active sites, excellent performance, low cost and long-term stability.