4231 results about "Flow battery" patented technology

The invention relates to the technical field of power supply devices, in particular to an energy-saving optimization method for an electric energy storage device, and the method comprises the steps: fusing a lithium ion battery solid-liquid phase change kinetic equation, a flow battery fluid mechanics equation and a flywheel rotor rigid-flexible coupling equation through a neural differential equation; constructing a dynamic meta-knowledge base containing cross-time scale nonlinear interaction features; performing dynamic parameter compensation on the polarization voltage hysteresis effect and the electrolyte flow resistance coupling effect by using a physical information neural network to generate a decoupled residual feature vector; according to the method, multi-physics field coupling modeling is achieved through the dynamic meta-knowledge base, and the energy efficiency optimization effect of the energy storage device is improved by combining the physical information neural network and the quantum optimization algorithm.

The invention discloses an intelligent energy scheduling method and system for a flow battery, and relates to the technical field of flow batteries, and the method comprises the following steps: collecting energy operation parameters of the flow battery in real time, and dynamically estimating an electrolyte state to obtain multiple pieces of energy state information; a target to be dispatched is set, and a fuzzy control strategy is formulated through retrograde multi-target optimization; executing a fuzzy control strategy to generate a regulation and control signal set and scheduling; and finally, according to a scheduling result, performing reverse tracing to optimize a fuzzy control strategy, and updating a regulation signal set to obtain a multi-stage regulation instruction to perform intelligent scheduling on the energy of the flow battery. The method solves the technical problems of low matching degree between a scheduling strategy and an actual demand, large power loss and fast battery life attenuation caused by difficulty in accurately capturing an energy state in real time in a traditional flow battery scheduling method, and achieves the purposes of intelligent flow battery energy scheduling, power loss reduction, battery life prolonging and energy conservation. And the matching degree between the scheduling and the actual demand is improved.

The invention provides an intelligent management method and system for photovoltaic energy storage equipment, and the method comprises the steps: analyzing the power fluctuation trend through monitoring the output power and environment parameters of the photovoltaic energy storage equipment in real time, and pre-judging the power fluctuation characteristics; according to the operation state parameters of the supercapacitor and the vanadium redox flow battery and the power fluctuation pre-judgment result, the power distribution proportion and the cooperative working mode of the energy storage element are determined; based on industrial load demand characteristics, an energy storage element is controlled to be flexibly switched between an active adjustment mode and a reactive compensation mode; and voltage regulation and harmonic compensation are realized by monitoring electric energy quality indexes of parallel connection points. According to the invention, the rapid response capability of the photovoltaic energy storage system to the industrial load can be effectively improved, the power supply stability and the electric energy quality are remarkably improved, the system power fluctuation is reduced, the utilization efficiency of the energy storage equipment is improved, and reliable clean energy support is provided for industrial users.

The invention discloses a positive electrode material for a zinc-bromine flow battery and a preparation method and application thereof, and belongs to the technical field of zinc-bromine flow batteries, the preparation method comprises the following steps: crushing and sieving an active carbon source, adding the active carbon source into a graphene oxide aqueous dispersion, stirring, centrifuging, removing supernate, drying, mixing with an activating agent, and activating in an inert atmosphere; washing to be neutral, drying and sieving to obtain a graphene / activated carbon composite material; and attaching the graphene / activated carbon composite material to a carbon-plastic bipolar plate to obtain the positive electrode material for the zinc-bromine flow battery. A graphene / activated carbon composite system is combined with a high-conductivity network, graded holes and surface functional groups, so that the reaction kinetics bottleneck of a traditional carbon material Br2 is broken through.

The invention discloses a method for testing polarization and decoupling of a flow battery. The method aims to quantify and separate three phenomena of ohmic polarization, activation polarization and concentration polarization in the flow battery. Comprising the following steps: firstly, carrying out electrochemical impedance spectroscopy testing under open-circuit voltage and different working currents respectively to obtain ohmic resistance and charge transfer resistance, and carrying out integral calculation to obtain ohmic polarization and activated polarization; then, carrying out a step type constant current charging test to obtain a total polarization curve; and finally, subtracting the ohmic polarization and the activation polarization from the total polarization to obtain concentration polarization. The method is simple and convenient to operate and suitable for various types of flow batteries, a novel and effective solution is provided for polarization analysis of the flow batteries, an accurate test basis can be provided for optimization of battery design, and improvement of performance optimization and research level of the flow batteries is facilitated.

The invention discloses a modified graphite felt electrode for an all-vanadium redox flow battery and a preparation method of the modified graphite felt electrode, and belongs to the technical field of redox flow battery electrode materials. The preparation method comprises the following steps: graphite felt electrochemical oxidation etching treatment; self-assembling a conductive layer on the oxidized and etched graphite felt to obtain the graphite felt attached with the conductive layer; and loading a metal and nitrogen-doped carbon (M and NC) nano catalyst layer on the graphite felt attached with the conductive layer to obtain the modified graphite felt electrode. Various properties of the graphite felt are comprehensively improved through matrix treatment, structure change and load catalysis, mild electrochemical oxidation etching is adopted, a carbon fiber structure is protected, a self-assembled net-shaped conductive layer forms a stable conductive channel, the specific surface area is remarkably increased, a nitrogen-doped carbon shell is adopted to wrap metal nanodots to form an M-NC catalytic layer, and the specific surface area is remarkably increased. The catalyst layer is not easy to dissolve out, the capacity fading rate is obviously improved, the loading capacity of the catalyst layer on the reticular structure conducting layer with a larger specific surface area is larger, and meanwhile, the process is simple and low in cost.

The invention provides a low-cost flow battery and an application thereof, a redox active substance of a positive electrode electrolyte of the low-cost flow battery contains a hydroxylamine cyclic structure group with hindered amine, and the hydroxylamine cyclic structure group with hindered amine is preferably selected from 1-hydroxy-2, 2, 6, 7, 8-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, 3, 5-tetramethyl-1, one or more of a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidine group, and a 1-oxo-2, 2, 6, 6-tetrasubstituted piperidinium group; a redox active substance of the negative electrode electrolyte contains one or more of a titanium element, a vanadium element, a chromium element, an iron element and a zinc element. The low-cost flow battery has the advantages of high output voltage, high energy density, environment friendliness and low cost, and has good application prospects and large-scale popularization potential in the field of energy storage.

The invention provides a preparation method of a bipolar plate of a redox flow battery, which comprises the following steps: adding a coupling agent into resin and graphite powder, so that one end of the coupling agent is wound with the resin, the other end of the coupling agent is chemically crosslinked with the treated graphite powder to form a crosslinked net-shaped three-dimensional structure, and meanwhile, adding a conductive polymer to increase a conductive path between flexible graphite; the high-density graphite paper on the upper side and the lower side of the bipolar plate can prevent electrolyte of the flow battery from entering the bipolar plate, and the situation that the performance of the bipolar plate is reduced due to the fact that resin is in direct contact with the electrolyte is avoided.

The invention discloses preparation and application of a diatomic catalyst modified carbon felt electrode. The preparation method of the modified carbon felt electrode comprises the following steps: dissolving bismuth salt, cobalt salt and urea in water to obtain a complexing solution; immersing the carbon felt substrate subjected to acid activation into a complexing solution for soaking treatment, then taking out the carbon felt substrate, and drying to obtain a precursor-loaded carbon felt; and sequentially carrying out primary heating, cold shock and secondary heating treatment on the precursor-loaded carbon felt, and cooling to obtain the Bi-Co diatom modified carbon felt electrode. The carbon felt electrode can be applied to an all-vanadium redox flow battery. The innovation point of the invention lies in that through the synergistic effect of double atoms and the mutual cooperation of the nitrogen-doped carbon substrate, the intrinsic activity bottleneck of the traditional catalyst is broken through, the comprehensive advantages of high catalytic activity, excellent stability and low cost are achieved, and a new technical solution is provided for the high performance and large-scale application of the flow battery.

The invention discloses a fuel cell coupled flow battery energy supply system and an operation control method thereof. The energy supply system comprises a basic energy supply unit, an energy storage peak regulation unit, a renewable energy power generation unit, an electrolytic hydrogen production unit, a hydrogen storage unit, a first-stage waste heat recycling unit, a second-stage waste heat recycling unit and a heat storage unit. The basic energy supply unit is used for providing a basic power load of the target building group; the energy storage peak regulation unit is used for providing fluctuation power load of the target building group; the first-stage waste heat recycling unit receives first-stage waste heat generated by power generation of the fuel cell and is used for indoor heating or indoor refrigeration. And the second-stage waste heat recycling unit directly receives the first-stage waste heat or second-stage waste heat from the first-stage waste heat recycling unit and is used for preheating the electrolyzed water and / or the hydrogen storage unit. By arranging the first-stage waste heat recycling unit and the second-stage waste heat recycling unit, waste heat is utilized in a multi-stage mode according to requirements, and the waste heat utilization rate is high.

The invention discloses a composite electrode material for a zinc-bromine flow battery and a preparation method and application thereof, and the preparation method comprises the following steps: S1, uniformly stirring a copper salt, a zinc salt, a sodium salt and distilled water at room temperature, aging in air, and then filtering, washing and drying to obtain a zinc-copper composite salt; s2, adding a polymer into an organic solvent under a stirring condition, and stirring under a water bath condition to obtain a spinning solution; then adding zinc-copper composite salt, stirring and then carrying out ultrasonic dispersion to obtain a composite spinning solution; s3, preparing the composite spinning solution into a precursor nanofiber material by utilizing high-voltage electrostatic spinning; and S4, carrying out pre-oxidation and carbonization treatment on the precursor nanofiber material in an atmosphere furnace, and cleaning and drying the carbonized material to obtain the composite electrode material for the zinc-bromine flow battery. According to the invention, the problems of low surface activity of bromine electrode reaction on an electrode material, unstable electro-catalytic performance, bromine permeation and the like in the zinc-bromine flow battery can be solved.

The invention relates to the technical field of cationic polymers, in particular to a high-alkali-resistance polyarylene alkylene piperidine cationic polymer as well as a preparation method and application thereof. The preparation method of the high alkali resistance poly (arylene alkylene piperidine) cationic polymer comprises the following steps: carrying out catalytic polycondensation on 1-R6-3-piperidine formaldehyde or salt or hydrate thereof and an aromatic compound to obtain a polymer with a piperidine structure; and further performing ionization reaction to obtain the polyarylene alkylene piperidine cationic polymer. The anion exchange membrane prepared based on the piperidine cationic polymer has ultrahigh alkali resistance and excellent mechanical properties and ionic conductivity, and can be used in the electrochemical energy conversion fields of fuel cells, water electrolysis hydrogen production, carbon dioxide electroreduction, flow batteries and the like, and the separation fields of electrodialysis, water treatment and the like.

The invention discloses a high-capacity positive electrode electrolyte for all-vanadium liquid flow batteries, wherein the electrolyte contains a solid energy storage material with a concentration of 0.02-1 g / mL, and the main component is a targeted redox solid energy storage material containing ammonia-rich iron / copper ferrocyanide, which reacts with a positive electrode redox medium VO in a supporting electrolyte containing ammonium ions. 2+ / VO2 + With similar equilibrium potential, reversible redox reaction can occur to continue the charge and discharge process. The high-capacity all-vanadium liquid flow battery positive electrode electrolyte disclosed in the present invention uses low-cost solid energy storage materials as the main energy storage medium, so when using a lower positive electrode redox medium VO 2+ / VO2 + High capacity and energy can be achieved at low concentrations, and pentavalent vanadium VO2 + The concentration can enhance the temperature adaptability of the all-vanadium liquid flow battery system while reducing the electrolyte cost.

The invention belongs to the technical field of all-vanadium redox flow battery electrodes, and discloses a photocuring modified graphite felt for a vanadium battery and a preparation method thereof.The preparation method comprises the following steps that functional hyperbranched polyethylene containing silicon-oxygen bonds and double bonds is subjected to auxiliary stripping under the action of ultrasound, and graphite and multi-walled carbon nanotubes are modified in situ at the same time; the preparation method comprises the following steps: preparing a high-concentration carbon nanomaterial dispersion liquid, soaking a graphite felt in the carbon nanomaterial dispersion liquid, adding a photoinitiator, stirring and standing, initiating a double-bond reaction through ultraviolet light irradiation to prepare a cured graphite felt, and further calcining to obtain the modified graphite felt. The carbon nanomaterial is uniformly and firmly adsorbed on the fiber surface of the graphite felt, the conductivity of the graphite felt is increased, meanwhile, a cage type polysilsesquioxane group is introduced, the group contains rich silicon-oxygen bonds, and more reaction active sites are provided, so that the voltage efficiency and the energy efficiency of the all-vanadium redox flow battery are improved.

The invention relates to the technical field of flow battery production, in particular to an adsorption tool with a runner electrode plate and a working method. The adsorption tool comprises a suction cup frame, and a suction cup is installed on the suction cup frame; the bottom of the suction cup is provided with a flat-plate-shaped working surface, and the working surface is provided with a plurality of negative pressure adsorption ports for adsorbing the electrode plates; and at least one compensation nozzle is arranged on the working surface and is aligned with a via hole of the electrode plate. The working method comprises the steps that a, the adsorption tool is moved to the position over the to-be-adsorbed electrode plate; b, the negative-pressure adsorption port keeps a negative-pressure adsorption state, and the bottom working face of the suction cup makes contact with the to-be-sucked electrode plate; c, the adsorption tool moves to a release station, d, the negative pressure adsorption opening removes the negative pressure, the adsorbed electrode plate is released, and meanwhile the compensation spray head is started. Through the arrangement, under the condition that a servo system and the release height of the electrode plate are not changed, pressure is compensated below the electrode plate, the falling speed of the electrode plate is slowed down, and the electrode plate is protected.

The invention discloses a flow battery system and a temperature control method thereof. A positive electrode heater and a positive electrode cooler which are used as a positive electrode temperature control assembly are arranged in a positive electrode electrolyte conveying and temperature management unit, and a negative electrode heater and a negative electrode cooler which are used as a negative electrode temperature control assembly are arranged in a negative electrode electrolyte conveying and temperature management unit. Closed-loop or open-loop management is carried out on the positive electrode temperature control assembly and the positive electrode in-pile or out-pile temperature or the temperature adjusting rate of the positive electrode in-pile or out-pile temperature, and closed-loop or open-loop management is carried out on the negative electrode temperature control assembly and the negative electrode in-pile or out-pile temperature or the temperature adjusting rate of the negative electrode in-pile or out-pile temperature, so that the temperature and the temperature change rate can be effectively controlled. Through the implementation of the invention, the system temperature management can be finer, the adaptability of the system under different conditions is improved, the battery performance and the system efficiency can be improved, the operation mode can be adjusted according to requirements in the operation process, and the application is more flexible; the system operation reliability can be enhanced, the system life is prolonged, and the system efficiency is improved.

The invention relates to the technical field of all-vanadium redox flow batteries, in particular to a sulfonated polybenzimidazole proton exchange membrane as well as a preparation method and application thereof. The proton exchange membrane structurally comprises a polybenzimidazole polymer main chain and a sulfonic acid group, the free volume of the polybenzimidazole polymer is regulated and controlled by synthesizing raw materials with different structures, and the polybenzimidazole proton exchange membrane is obtained by sulfonating the polybenzimidazole polymer. Aiming at the problems of cross permeation of vanadium ion electrolyte of a positive electrode and a negative electrode of the all-vanadium redox flow battery, capacity attenuation of the all-vanadium redox flow battery and low energy conversion efficiency, the preparation method comprises the following steps: constructing a polybenzimidazole polymer main chain by selecting raw materials with high rigidity and high free volume; the mechanical property of the polybenzimidazole membrane is improved while a rapid ion channel is constructed in the polymer membrane, and water molecules can be contained to limit swelling of a membrane material.

The invention relates to a flow battery charge state detection device and method, and is applied to the technical field of flow batteries. Compared with the prior art, the reference detection cavity connected with the bipolar plate is formed, the reference electrolyte can be replaced and supplemented without arranging a reference electrolyte storage tank, the adaptability of the detection device is improved, and the reference detection cavity corresponds to the positive electrolyte detection cavity and / or the negative electrolyte detection cavity, so that the detection efficiency is improved. A reference electrode is arranged in a reference detection cavity, the potential deviation of a reference electrolyte can be detected and calibrated in real time, and a calibration voltage value of the reference detection cavity is obtained, so that the potential of a positive electrode electrolyte relative to the reference electrode, the potential of a negative electrode electrolyte relative to the reference electrode and the calibration voltage value are used for calibrating the potential deviation of the reference electrolyte. The concentration of each valence ion is calculated on line through a multi-parameter empirical formula, and the charge state of the flow battery is obtained in real time through the concentration of each valence ion, so that the detection error is reduced, the detection sensitivity is improved, and the real-time monitoring precision of the charge state is improved.

The invention relates to a bismuth-containing modified electrolyte, an all-vanadium redox flow battery and a preparation method and application of the all-vanadium redox flow battery, and belongs to the technical field of all-vanadium redox flow batteries. The bismuth-containing modified electrolyte comprises a vanadium electrolyte, bismuth salt is added into the vanadium electrolyte to serve as a catalyst, and a hydroxyl carboxylic acid complexing agent is added; the molar ratio of the bismuth salt to the hydroxycarboxylic acid complexing agent is (6-8): (0.6-0.8). According to the invention, the catalyst and the complexing agent are added into the electrolyte, the Bi elementary substance is deposited on the electrode through the charging process of the battery, the active sites of the electrode are increased, and the energy efficiency of the battery is improved. Meanwhile, the catalyst can improve the capacity retention ratio of the flow battery, greatly simplify the process steps and reduce the cost.

The invention relates to the technical field of flow batteries, in particular to a flow battery flow field uniformity detection device and a detection method, and the flow battery flow field uniformity detection device comprises a visual flow field assembly, a constant temperature water tank, a circulating pump, a pressure gauge, a thermal imager and a connecting pipeline. The visual flow field assembly, the constant-temperature water tank, the circulating pump and the pressure gauge are connected through connecting pipelines, the shooting range of the thermal imager covers the whole visual flow field area, and the temperature change of the flow field area along with time is recorded. According to the invention, the temperature change rate of the fluid at the outlet is controlled by adjusting the heating power of the water tank, and when the fluid passes through the flow channel of the electrode frame, a relatively large temperature gradient is ensured in the flow channel range of the whole visual flow field assembly. And calculating a temperature deviation value to evaluate the fluid uniformity according to the linear relationship between the temperature difference and the speed difference.

The invention discloses a flow battery state-of-charge estimation method based on a TCN-BiLSTM neural network and EIS data, and belongs to the technical field of flow battery management. According to the method, temperature, flow velocity, frequency, real part impedance and imaginary part impedance are extracted as input characteristics by measuring EIS data of the flow battery under different SOCs, and a hybrid model fusing a time convolutional network (TCN) and a bidirectional long-short-term memory network (BiLSTM) is constructed. The TCN captures a local time sequence dependency relationship through multi-layer expansion convolution and residual connection, the BiLSTM learns global sequence features by using a bidirectional gating mechanism, and finally, the global sequence features are mapped into SOC values through a full connection layer. According to the model, Min-Max normalization preprocessing data is adopted, a mean square error is used as a loss function and is combined with an Adam optimizer for training, and the estimation precision is evaluated through MAE, RMSE and R2 indexes. According to the method, the TCN-BiLSTM neural network model is trained based on the EIS data, the defects of a traditional SOC estimation method under the dynamic operation condition can be overcome, and the method has the advantages of being high in precision, high in robustness and wide in applicability.

The invention relates to the technical field of new energy storage, and discloses a liquid leakage detection and collection method for a galvanic pile of a flow battery energy storage system, which comprises the following steps of: arranging a humidity sensor, a gas sensor, a temperature sensor, a visual sensor and a pressure sensor in a key area of the galvanic pile to form a high-density detection network of multi-source data; sensor data are collected and transmitted to a control center in real time, multi-source data are fused through Kalman filtering, Bayesian estimation and a deep learning model, and feature information of liquid leakage is obtained; and based on feature information of multi-source data fusion, a multi-point interpolation method and three-dimensional space modeling are used to realize positioning of a liquid leakage area. The intelligent grading response and control technical scheme is adopted, and factors such as leakage diffusion and environmental conditions are dynamically analyzed, so that grading self-adaptive response of operations such as isolation, cooling, load shedding and shutdown is realized, and compared with the scheme that only single isolation or shutdown is adopted to cope with a leakage event in the prior art.

The invention provides a real-time all-vanadium redox flow battery management system and a real-time all-vanadium redox flow battery management method based on a Linux system, and the real-time all-vanadium redox flow battery management system based on the Linux system comprises a battery management subsystem BMS, an energy storage converter PCS, an energy management subsystem EMS and an all-vanadium redox flow battery, the battery management subsystem BMS is used for monitoring, evaluating, protecting and balancing the all-vanadium redox flow battery; the energy storage converter PCS is used for controlling the charging and discharging processes of the all-vanadium redox flow battery, performing alternating current and direct current conversion and transmitting related information to the battery management subsystem BMS; and the energy management subsystem EMS is used for managing energy in the whole system, predicting the attenuation rate and the cycle life of the all-vanadium redox flow battery, and transmitting a prediction result to the battery management subsystem BMS through optical fiber communication. By means of the battery management subsystem, real-time monitoring is achieved, the operation capacity is high, and the real-time performance of the system is improved.

The invention discloses a highly active graphite felt for vanadium battery and a preparation method thereof, and belongs to the technical field of all-vanadium liquid flow battery electrodes. The method comprises the following steps: electrodepositing a layer of polymer on the graphite felt, then hydrothermally loading metal molybdenum, chelating the metal molybdenum with phytic acid, and finally pyrolyzing at high temperature to obtain a graphite felt loaded with an organic skeleton-metal oxide-organic skeleton hierarchical structure. The hierarchical structure is not only conducive to increasing the specific surface area and active sites of the graphite felt, but also can protect the metal catalyst from falling off or being consumed under long-term catalytic reaction and electrolyte flushing.

The invention relates to an analysis method and equipment for a flow channel and a flow field structure of a flow battery, and a storage medium. The method comprises the steps of determining a target first design parameter of each flow channel in a main flow region structure according to a first design parameter of each flow channel in the main flow region structure and a first relationship between bypass current loss and flow resistance loss; for the distribution area structure, determining a target second design parameter of each flow channel in the distribution area structure according to a second design parameter of each flow channel in the distribution area structure and a second relationship between the flow deviation and the flow resistance loss of the flow channel; and for the reaction zone structure, determining a target third design parameter of the reaction zone according to the third design parameter of the reaction zone structure and a third relationship between the lowest concentration deviation and the concentration polarization of the conductor in the reaction zone structure. By adopting the method, the structure of the flow battery can be optimized, so that the concentration polarization of the flow battery is reduced.

The invention belongs to the field of flow energy storage battery materials, and particularly relates to a multi-dimensional conductive material, a preparation method thereof and application of the multi-dimensional conductive material in an all-vanadium flow battery. Graphite and multi-walled carbon nanotubes are bonded together by adopting a biomass precursor, a carbon base of biomass is converted into graphitized carbon nanotubes through step-by-step pyrolysis, amorphous carbon in the graphite and the original carbon nanotubes is further graphitized, and finally the multi-dimensional conductive material with the carbon nanotubes inserted on a graphite matrix is formed. The multidimensional characteristic of the surface of the multidimensional conductive material is beneficial to formation of a longitudinal conductive path of the bipolar plate and reduction of vertical body resistance of the bipolar plate, and is also beneficial to wetting of epoxy resin among conductive particles and mechanical interlocking of molecular chains of the epoxy resin, so that the mechanical strength of the bipolar plate is improved, the use performance of the bipolar plate is effectively enhanced, and the service life of the bipolar plate is prolonged. The requirement of long-time operation of the flow battery is met, the material cost of the flow battery is relatively reduced, the industrialization of the bipolar plate is powerfully promoted, and the application value is very good.

The present invention relates to novel lignin-derived compounds and compositions comprising the same and their use as redox flow battery electrolytes. The invention further provides a method for preparing said compounds and compositions as well as a redox flow battery comprising said compounds and compositions. Additionally, an assembly for carrying out the inventive method is provided.

The invention discloses a high-stability iron-cerium flow battery and a preparation method of electrolyte, and belongs to the technical field of flow batteries. A positive electrolyte and a negative electrolyte are cerium salt and ferric salt, and are respectively mixed with nitrilotriacetic acid, ethylenediamine tetraacetic acid, trans-1, 2-cyclohexanediamine tetraacetic acid, 1, 3-propane diamine tetraacetic acid, N-(2-ethoxyl) ethylenediamine-N, N ', N'-triacetic acid, iminodiacetic acid, iminodisuccinic acid, succinic acid, N, N '-bis (2-hydroxyethyl)-N, N', N '-triacetic acid and N, N'-bis (2-hydroxyethyl)-N, N '-bis (2-hydroxyethyl)-N, N'-bis (2-hydroxyethyl)- N, N '-ethylenediamine disuccinic acid, aspartic acid or a derivative chemical thereof are coordinated to form an aqueous solution of the coordination compound. The positive electrolyte and the negative electrolyte are prepared from the same and equal chelating agent and supporting electrolyte, and the matching degree of the acid-base property of the positive electrolyte and the negative electrolyte is maintained; the auxiliary electrolyte is added, so that the viscosity difference between the positive electrolyte and the negative electrolyte is reduced, the transmembrane migration of water is reduced, and the conductivity is improved. The selected chelating agent is stably combined with iron and cerium, transmembrane transportation of active substances is inhibited, ion cross contamination among different electrolytes is reduced, and meanwhile side reactions are reduced. The price is low, and the charge-discharge performance and the cycle life of the iron-cerium flow battery are effectively improved at relatively low cost.

The invention discloses a low-cost neutral aqueous organic iron-cerium flow battery, and belongs to the field of electrochemical energy storage. The positive electrode electrolyte and the negative electrode electrolyte both adopt organic phosphine ligand chelating metals in a water system, and organic phosphine ligands are selected from 2-hydroxyphosphonoacetic acid, etidronic acid, diethylenetriaminepenta (methylene phosphonic acid), 2-phosphonobutane-1, 2, 4-tricarboxylic acid, polyhydric alcohol phosphate ester, hexamethylenediamine tetra (methylene phosphonic acid), polyamino polyether methylene phosphonic acid and bis (1, 2, 4-tricarboxylic acid. And one or more of 2, 6-hexylidene triamine penta (methylene phosphonic acid) and lithium, sodium, potassium and ammonium salt derivatives thereof. And the supporting electrolyte is used for adjusting and stabilizing the pH environment of the electrolyte. According to the invention, no additional auxiliary electrolyte is needed, high conductivity and stable performance can be achieved, and a new possibility is developed for development and application of a flow battery technology. The material has the characteristics of stable performance, low cost, wide raw material source and environmental friendliness, and is suitable for automobile power supplies, household energy storage, standby power supplies, large-scale energy storage devices and the like.

The invention relates to a preparation method and application of a sandwich-structured gas diffusion electrode, and belongs to the fields of electrochemical catalysis, carbon dioxide utilization and renewable energy sources. According to the preparation method, a catalyst layer, a cation layer and a protective layer are prepared on a gas diffusion substrate in a layered manner; the catalytic layer, the cation layer and the protective layer respectively play roles in catalyzing CO2 reduction, adjusting the microenvironment, preventing cation leakage and the like. When applied, the sandwich-structured gas diffusion electrode GDE prepared by the method can be assembled on electrochemical carbon dioxide reduction modules such as a flow battery and a membrane electrode assembly (MEA) to carry out electrochemical reduction reaction of CO2, has high activity and high stability, and can avoid adding inorganic alkali metal cations into catholyte to inhibit hydrogen evolution side reaction. Based on the invention, GDE can be prepared through a microenvironment engineering means, and the performance of the electrochemical reduction reaction of carbon dioxide is improved.