54 results about "Direct methanol fuel cell" patented technology

Improved performance ion exchange membranes for use in REM, AEM and DMFC fuel cells, buffered fuel cells, hydrolysis, other applications comprise a molecular matrix of homopolymers, di-monomer, heteropolymers, copolymers, or block-polymers of fluorocarbon and hydrocarbon compounds combined with (i) skeletal support grid to improve durability, handling, reduce membrane swelling, and sequester dopants and nanoparticles from leakage; (ii) microporous membrane formed using a sacrificial filler process enhancing conductivity and limiting fuel crossover; (iii) hetero-ionomeric matrix of two-or-more membrane-bound acids e.g. sulphonic and phosphonic acid expanding usable range; (iv) permanent fillers enhancing conductivity and porosity including nanoparticles, metal-oxides, zeolites, silicates, GOs, CNTs, MOFs, POSS, and others; (v) ionic liquid doping to enhance membrane conductivity; (vi) membrane nanocoating preventing H2O2 diffusion; and / or (vii) catalytic nanocoating with metals, metal-oxides, and MOFs preventing atmospheric toxin catalyst poisoning. Combined with a heterogenous GDI, the IEM is integrated into iBFC power blade and energy bank applications.

The invention provides a high-entropy intermetallic compound bifunctional catalyst as well as a preparation method and application thereof, and belongs to the technical field of energy materials. A wet chemical synthesis method and a controllable annealing process are combined to prepare the high-entropy intermetallic compound bifunctional catalyst, the catalyst comprises carbon-loaded platinum-cobalt-copper-tungsten-molybdenum five-element high-entropy alloy nanoparticles, the alloy nanoparticles have a high-entropy effect and an ordered structure at the same time, the particle size is 4-7 nm, and the particle size of the alloy nanoparticles is 4-7 nm. The molar ratio of metal atoms, namely platinum to cobalt to copper to tungsten to molybdenum, is 4: (1.75 to 2.5): (1.75 to 2.5): (0.01 to 0.5): (0.01 to 0.5). The platinum loading capacity in the catalyst is 20-70 wt%, the catalyst is used for oxygen reduction reaction catalysis of a cathode in a hydrogen fuel cell and / or methanol oxidation reaction catalysis of an anode in a direct methanol fuel cell, the half-wave potential in an acid medium exceeds a commercial Pt / C catalyst by 30 mV or above, and the methanol oxidation peak current density is 1.4-2.5 times that of the commercial Pt / C catalyst or a commercial PtRu / C catalyst.

The invention provides a carbon-supported platinum-cobalt-copper multifunctional alloy catalyst and a preparation method and application thereof, and belongs to the technical field of energy materials. Wherein the nanocarbon carrier solution is mixed with a chloroplatinic acid solution, a cobalt chloride solution and a copper chloride solution, a sodium hydroxide aqueous solution is added to adjust the pH value, ultrasonic dispersion and stirring are performed to obtain turbid liquid, and the molar ratio of platinum ions to cobalt ions to copper ions is 2: (0.5-1): (0.5-1); then, putting the turbid liquid into a reaction kettle, and reacting at 120-250 DEG C for 1-6 hours to obtain a black colloidal solution; then filtering, washing and drying the black colloidal solution to obtain black powder; and finally, carrying out acid treatment on the black powder, and grinding to obtain the carbon-loaded platinum-cobalt-copper multifunctional alloy catalyst. The catalyst is used for catalyzing an oxygen reduction reaction of a cathode in a hydrogen fuel cell and / or a methanol fuel cell, and / or catalyzing a methanol oxidation reaction of an anode in a direct methanol fuel cell.

The invention relates to the technical field of fuel cells, in particular to a portable direct methanol fuel cell which comprises a cell box, a partition plate fixedly installed in the middle of the cell box, a methanol cell fixedly installed above the partition plate, a first air inlet and a second air inlet formed in the bottom of the cell box and the partition plate respectively, and heat dissipation openings formed in the two side walls of the cell box. A radiator is fixedly installed on the inner side of the heat dissipation opening. And the base is installed below the battery box in an up-down floating mode and used for supporting the battery box and controlling opening and closing of the first air inlet, sealing plates are fixedly installed on the two sides of the base correspondingly, and a telescopic rod used for controlling the position of the base is fixedly installed at the bottom of the battery box. In the invention, external air exchanges heat with the outer wall of the methanol battery and the heating element in the battery box, so that heat in the battery box is quickly taken away, and the influence of continuous high temperature of the inner wall of the battery box on the service life of the methanol battery is avoided.

The utility model discloses a hydrogen production and power generation coupling system based on methanol concentration difference, which relates to the technical field of methanol electrolysis hydrogen production and comprises a methanol electrolysis hydrogen production reactor, a methanol water supply unit, a direct methanol fuel cell and an energy storage cell, the methanol water supply unit provides methanol water required by hydrogen production for the methanol electrolysis hydrogen production reactor, and a water outlet of the methanol electrolysis hydrogen production reactor is communicated with a water inlet of the direct methanol fuel cell, so that low-concentration methanol water output by the methanol electrolysis hydrogen production reactor is input into the direct methanol fuel cell for power generation; the direct methanol fuel cell, the energy storage cell and the methanol electrolysis hydrogen production reactor are sequentially in circuit connection. According to the methanol electrolysis hydrogen production reactor, the high-concentration methanol aqueous solution is used for electrolysis hydrogen production, the output low-concentration methanol aqueous solution serves as a raw material for power generation of the direct methanol fuel cell, the direct methanol fuel cell generates power and then supplies the power for hydrogen production of the methanol electrolysis hydrogen production reactor, an external power source is not needed for power supply, and the system efficiency is high.

The invention discloses a preparation method of a Pd / O-OMS-2 direct methanol fuel cell bifunctional catalyst with a Pd-O-Mn interface chemical bond and high Mn < 3 + > content. The Pd / O-OMS-2 bifunctional catalyst with high Mn < 3 + > content is prepared by constructing a Pd-O-Mn interface chemical bond on a Pd and OMS-2 oxygen-enriched oxide interface through a wet chemical reduction method on the basis of strong interaction of metal and a carrier. Due to introduction of a Pd-O-Mn interface chemical bond, redistribution of charges is effectively promoted, the electronic state of a noble metal Pd active site is adjusted, and the catalytic ability of the catalyst is improved. The prepared Pd / O-OMS-2 catalyst shows excellent catalytic performance, long-term stability and efficient four-electron path selectivity in oxygen reduction reaction and methanol oxidation reaction, and is suitable for direct methanol fuel cells. The catalyst is simple in preparation process and low in cost, and has a wide commercial prospect.

This invention discloses a method for coupling a vanadium-based energy storage medium to a fuel cell, relating to the technical field of batteries. The method includes the following steps: a vanadium-based energy storage medium, a fuel cell, and a coupling system. This invention combines the oxidation of vanadium-based energy storage materials with CO2 reduction to form an electrolytic cell. Formic acid or methanol, obtained from the reduction of CO2 at the cathode, is then used as the reactant at the anode of the formic acid or methanol fuel cell, achieving stable power output and time-controlled operation. Since formic acid is a liquid at room temperature, has low toxicity, and possesses a higher electromotive force than hydrogen and methanol, formic acid fuel cells have greater potential and application range compared to hydrogen and methanol fuel cells, enabling stable energy output. Furthermore, by coupling the vanadium-based energy storage medium with a direct methanol fuel cell, efficient storage and full utilization of methanol are achieved, effectively reducing the negative impacts of methanol permeation and improving battery stability and energy output in practical applications.

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 present invention provides a direct methanol fuel cell system suitable for inferior fuel, comprising: a buffer tank, a first liquid pump, a fuel purification module, a stack, an air compressor, a three-way solenoid valve, a fuel tank and a second liquid pump, wherein the fuel purification module is provided with a finished product layer, a raw material layer and a tail gas layer, the buffer tank, the first liquid pump, the finished product layer and the stack are connected in sequence, the inlet of the buffer tank is connected to the anode side outlet of the stack, the cathode inlet of the stack is connected to the air compressor, the cathode outlet of the stack is connected to the inlet of the three-way solenoid valve, the second outlet of the three-way solenoid valve is connected to the inlet of the tail gas layer, the raw material layer inlet is connected to the outlet of the second liquid pump, and the inlet of the second liquid pump is connected to the outlet of the fuel tank. The technical solution of the present invention solves the problem in the prior art that there is a lack of a direct methanol fuel cell system that can adapt to inferior methanol fuel without changing the stack state and operation strategy.

The invention discloses PtPdRuCuNi alloy aerogel and application of the PtPdRuCuNi alloy aerogel modified by PTFE to a DMFC as a catalyst layer, the PtPdRuCuNi alloy aerogel is prepared through the following steps: step 1, taking aqueous solutions of a Pt metal salt precursor, a Pd metal salt precursor, a Ru metal salt precursor, a Cu metal salt precursor and a Ni metal salt precursor, and uniformly mixing to obtain a mixed solution; step 2, adding a NaBH4 aqueous solution into the mixed solution obtained in the step 1, uniformly stirring, and standing for full reaction to obtain a solution containing PtPdRuCuNi pentabasic alloy aerogel; and step 3, removing the PtPdRuCuNi quinary alloy aerogel in the step 2, taking out the PtPdRuCuNi quinary alloy aerogel from the solution, and washing and drying the PtPdRuCuNi quinary alloy aerogel to obtain the PtPdRuCuNi alloy aerogel. And a hydrophobic agent PTFE is further introduced, so that a water transmission channel of the cathode catalyst layer of the direct methanol fuel cell is optimized, the oxygen transmission resistance is reduced, and the oxygen transmission efficiency and the power density of the membrane electrode are improved.

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 present invention belongs to the field of direct methanol fuel cells, and specifically relates to a Pt / Ag / g-C3N4 catalytic electrode, a preparation method thereof, and an application thereof. The Pt / Ag / g-C3N4 catalytic electrode comprises an inert electrode and Pt / Ag / g-C3N4 immobilized on the inert electrode. The present invention first immobilizes Ag / g-C3N4 on the inert electrode by a drop coating method, and then immobilizes Pt on the electrode by electroplating using the coordination effect of Pt and g-C3N4, thereby obtaining a Pt / Ag / g-C3N4 catalytic electrode. The Pt / Ag / g-C3N4 catalytic electrode provided by the present invention not only has a simple preparation method and mild and controllable reaction conditions, but also has good stability and catalytic activity. It can be directly used as an electrocatalytic anode of a methanol fuel cell for the catalytic oxidation of methanol. It is easy to use and has good promotion prospects.

The invention provides a methanol fuel tank for a fuel cell, the methanol fuel tank comprises a fuel tank main body and a fuel tank upper cover, an EPTFE membrane, a membrane sealing ring, a miniature PP5 one-way valve core, a valve core fixing seat and a silica gel liquid inlet pipe are sequentially integrated in the fuel tank main body; the fuel tank upper cover is composed of an upper cover screwing seat, a liquid inlet communicating vessel and a liquid inlet sealing ring. According to the methanol fuel tank, the risk of methanol leakage in the fuel tank can be effectively reduced, and methanol cannot be leaked out of the fuel tank under the condition that no pressure difference exists between the position of the liquid inlet communicating vessel and the outside, so that the use performance of a methanol fuel cell power supply is improved; and meanwhile, the methanol fuel tank can be used at 360 degrees by utilizing the universal silica gel liquid inlet pipe, so that the use directivity of the methanol fuel cell is improved. According to the design, the safety, the environmental protection property and the stability of the direct methanol fuel cell are improved, the use performance and the flexibility of the direct methanol fuel cell are also remarkably improved, and powerful support is provided for popularization and application of a methanol fuel cell technology.

The invention relates to the field of batteries, and discloses a multifunctional zinc air battery / methanol fuel cell material and a preparation method and application thereof.The battery material is of a polyhedral structure and comprises a cobalt-nitrogen-carbon material, the surface of the cobalt-nitrogen-carbon material is loaded with precious metal elements, and the precious metal elements are loaded on the surface of the cobalt-nitrogen-carbon material. The cobalt-nitrogen-carbon material is doped with transition metal elements, the prepared battery material has excellent HER, OER, ORR and MOR catalytic activity under the alkaline condition, after the battery material is prepared into a zinc-air battery, cyclic charging and discharging can reach 100 h or above, the power density can reach 120 mW * cm <-2 > or above, the energy density can reach 800 mA * h * g <-1 > Zn or above, and after the battery material is prepared into a direct methanol fuel battery, the energy density can reach 800 mA * h * g <-1 > Zn or above. According to the invention, the open-circuit voltage does not exceed 0.74 V, the power density is high and can reach more than 10 mW.cm <-2 >, the constant-current discharge stability is good, and the constant-current discharge time at 0.25 mA. Cm <-2 > can reach more than 1000 s.

The invention provides a lead-modulated high-poisoning-resistance intermetallic compound bifunctional catalyst as well as a preparation method and application thereof, and belongs to the technical field of energy materials. According to the catalyst, a carbon substrate is used as a carrier to load quaternary intermetallic compound nanoparticles composed of platinum, cobalt, copper and lead according to the molar ratio of Pt: Co: Cu: Pb being 4: (1.75-2.5): (1.75-2.5): (0.05-0.5), and the loading capacity of platinum is 20-70 wt%; the particle size of the quaternary intermetallic compound nanoparticles is 3-6 nm; the catalyst is prepared by wet chemical impregnation, heat treatment in a reducing atmosphere and acid pickling, and is used for oxygen reduction reaction catalysis of a cathode in a hydrogen fuel cell and / or methanol oxidation reaction catalysis of an anode in a direct methanol fuel cell; the half-wave potential of the catalyst in ORR is 25 mV or above higher than that of a commercial Pt / C catalyst, and the methanol oxidation peak current density in MOR is 2.5-5 times that of the commercial Pt / C catalyst or a commercial PtRu / C catalyst.

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 discloses a bifunctional catalyst for a direct methanol fuel cell, a structural unit of the bifunctional catalyst takes a carbon nanotube as a conductive substrate, defects are introduced on the surface through dielectric barrier discharge, and high-entropy alloy nanoparticles consisting of five transition metal elements are loaded on the surface. The preparation method comprises the following steps: S1, preparing a carbon nano tube marked as CNT (at) CC; s2, defects are manufactured on the surface of the CNT (at) CC through the dielectric barrier discharge technology, and a carbon nano tube rich in defects is obtained and marked as p-CNT (at) CC; s3, synthesizing multi-element high-entropy alloy nano-particles through an oil bath method, and recording the multi-element high-entropy alloy nano-particles as HEA NPs; and S4, loading HEA NPs on the p-CNT (at) CC prepared in the step S2, and carrying out Ar / NH3 plasma treatment to prepare the direct methanol fuel cell bifunctional catalyst, which is recorded as P-HEA-p-CNT (at) CC. By improving the charge transfer efficiency, reducing the reaction energy barrier, improving the electrocatalytic activity and selectivity, improving the ORR and MOR reaction performance, and improving the cycle stability and charge-discharge performance.

The invention belongs to the technical field of direct methanol fuel cells, and particularly relates to a preparation method and application of an SPBI-based composite proton exchange membrane containing sulfonated octaphenyl SPOSS, and the preparation method comprises the following steps: (1) preparing SPBI with high substitution degree through ring-opening reaction of cyclic lactone; (2) preparing sulfonated octaphenyl POSS (SPOSS) by adopting a chlorosulfonic acid sulfonation method; (3) dissolving the SPBI and the SPOSS obtained in the steps (1) and (2) in a good solvent, and casting to form a film; and (4) soaking the membrane obtained in the step (3) in an acid solution for ion self-crosslinking, washing with deionized water, and drying to obtain the composite proton exchange membrane. The SPBI-based composite proton exchange membrane containing sulfonated octaphenyl SPOSS prepared by the invention has the advantages of high proton conductivity and power density, low methanol permeability, good mechanical property and thermal stability and the like, and is a proton exchange membrane material with excellent comprehensive performance.

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 present invention relates to a proton exchange membrane containing PVDF in powder form, said PVDF being irradiated, grafted and phosphonated, to the method for preparing said membrane, and to the use of said membrane in fields requiring ion exchange, such as electrochemistry or energy-related fields. In particular, this membrane is used in the design of fuel cell membranes, such as proton-conducting membranes for fuel cells operating with H2 / air or H2 / O2 (these cells being known by the abbreviation PEMFC for "Proton Exchange Membrane Fuel Cell") or operating with methanol / air (these cells being known by the abbreviation DMFC for "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 method for solving the problems of catalyst poisoning and methanol permeation of a direct methanol (ethanol) fuel cell. The direct methanol (ethanol) fuel cell belongs to one of proton exchange membrane fuel cells (PEMFC). The carbon monoxide poisoning problem of a positive platinum electrode of an existing direct methanol (ethanol) fuel cell and the methanol (ethanol) permeation of a proton exchange membrane are unsolvable problems, and the popularization and use of the direct methanol fuel cell are directly influenced. The method comprises the following steps: (1) the direct methanol fuel cell works for a period of time, an input port of methanol fuel and an input port of oxygen are exchanged, a negative electrode is filled with strong oxidants such as hydrogen peroxide, the strong oxidants enable a poisoned electrode to recover the catalyst function through oxidation of the strong oxidants, and the catalyst function is further recovered through further oxidation of the oxygen; the system comprises a battery current output rectifier bridge, a methanol fuel exchange three-way electromagnetic valve and an oxygen exchange three-way electromagnetic valve, and the methanol fuel exchange three-way electromagnetic valve and the oxygen exchange three-way electromagnetic valve are controlled by a PLC or a single-chip microcomputer. And (2) two proton exchange membranes are added between the two electrodes, and a molecular sieve membrane is filled between the two proton exchange membranes, so that methanol (ethanol) permeation can be prevented.

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 application provides a direct methanol fuel cell bifunctional catalyst, which takes carbon cloth loaded with nitrogen-doped tungsten carbide nanometer array as a conductive substrate, and platinum-nickel alloy nanochain is wound on the high-conductivity tungsten carbide substrate. A preparation method of the direct methanol fuel cell bifunctional catalyst comprises the following steps: (1) preparing carbon cloth loaded with nitrogen-doped tungsten carbide nanometer array; (2) performing surface treatment through PECVD; (3) synthesizing Pt-Ni alloy polyhedral nanochain through hydrothermal reaction; (4) loading the Pt-Ni alloy polyhedral nanochain on the carbon cloth loaded with nitrogen-doped tungsten carbide nanometer array through self-adsorption; (5) annealing after calcination in air, nitrogen and argon-hydrogen gas in sequence; (6) performing second PECVD treatment, and the direct methanol fuel cell bifunctional catalyst is obtained. The prepared product has the characteristics of high conductivity, high specific surface area and good electrochemical performance. The LSV curve of MOR catalytic performance shows that the current density is obviously improved.

A self-powered methanol concentration sensing system for a direct methanol fuel cell belongs to the technical field of methanol concentration sensing for fuel cells. The present invention is proposed to address the problem that existing methanol concentration sensors cannot achieve self-power supply and are costly. It includes a fuel cell voltage detection module, which uses a shunt resistor to detect the operating voltage provided by the fuel cell, and uses an operational amplifier to obtain the amplified value of the operating voltage as the voltage feedback value of the fuel cell; a power management module, which uses a maximum power tracking point algorithm based on the operating voltage to periodically disconnect the fuel cell from the load and measure the current open circuit voltage of the fuel cell, and by adjusting the ratio of the operating voltage to the current open circuit voltage, the fuel cell operates at maximum power; a display module, which is used to convert the voltage feedback value into a current signal, and then determine the current methanol concentration of the fuel cell based on the current signal and display it. The present invention is used for methanol concentration detection in fuel cells.

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.