136 results about "Hydroxyl ion" patented technology

The invention belongs to the technical field of soil remediation, and provides a preparation method of a saline-alkali soil remediation agent aiming at the problem of insufficient long-acting stability caused by uncontrollable Ca < 2 + > release of an existing saline-alkali soil remediation agent. The method comprises the following steps: by taking alfalfa residues as raw materials, fermenting to generate acidic fermentation liquor, dissolving soil carbonate, reducing pH, triggering coordinate bond dissociation of chelated calcium gel, realizing pH responsiveness of releasing Ca < 2 + >, and releasing Ca < 2 + > to replace Na < + >; meanwhile, quinonyl on the surface of the modified biochar is used for activating extracellular electron transfer of the Prussella adamsii, and hydroxyl ion secretion is promoted to neutralize salt groups; the alfalfa humification fermentation material and exopolysaccharides secreted by flora are crosslinked through hydrogen bonds to form a cementation layer, soil aggregates are stabilized through a modified charcoal pore framework, calcium slow release balance is regulated and controlled, the problem of local hardening caused by sudden release of Ca < 2 + > is cooperatively solved, and long-acting repair and improvement of the saline-alkali soil are achieved.

The invention discloses a nickel-cobalt layered double hydroxide for a supercapacitor and a preparation method and application thereof, and belongs to the technical field of energy storage. The preparation method of the nickel-cobalt layered double hydroxide for the supercapacitor comprises the following steps: performing hydrothermal reaction on nickel salt, cobalt salt, ammonium citrate and urea to obtain the nickel-cobalt layered double hydroxide, the temperature of the hydrothermal reaction is 120-150 DEG C, and the time of the hydrothermal reaction is 6-12 hours. According to the invention, ammonium citrate is added to regulate the precipitation rate of the precursor, so that the morphology of the nickel-cobalt layered double hydroxide can be regulated and controlled, and the situation that the nickel-cobalt layered double hydroxide is rapidly combined with hydroxyl ions to cause too fast crystallization and coarse crystal grains is avoided; and meanwhile, the concentration uniformity of metal ions in the solution is regulated and controlled, so that the crystallinity of the nickel-cobalt layered double hydroxide is uniform, and lattice defects are reduced. Therefore, when the material is used as an electrode material of a supercapacitor, the material has relatively high specific discharge capacity.

The invention relates to a vertical flow biological induction dephosphorization system and a dephosphorization process. The system comprises a reactor body, an inner barrel and an outer barrel, wherein the inner barrel and the outer barrel form an inner reaction cavity and an outer reaction cavity; the flow guide device is communicated to the axial bottom end of the inner cylinder; the aeration device is arranged in the flow guide device and is used for aerating upwards; and the dephosphorization agent adding device is used for adding a dephosphorization agent while crushing particles below the flow guide device. By additionally arranging a dephosphorization agent adding device, large-particle-size anaerobic ammonia oxidation particles are crushed, a dephosphorization agent is added at the same time, an alkaline environment created by hydroxyl radicals generated by anaerobic ammonia oxidation reaction and microorganisms are used for synergistically promoting a dephosphorization path, a biological induced crystallization reaction is enhanced, and the dephosphorization effect is improved. According to the invention, calcium and magnesium ions are added into the phosphorus removal agent, the excessive calcium and magnesium ions and phosphate ions in the sewage are promoted to be subjected to a crystallization reaction, the free phosphate ions are converted into phosphorus-containing precipitates, the purposes of phosphorus removal and phosphorus resource recovery can be achieved, the dosage of alkaline agents in the phosphorus removal agent can be reduced, and considerable economic benefits are achieved.

The application relates to the field of wastewater treatment catalysis, and discloses a Fe-Cu-Mn ternary hydrotalcite-like catalyst and a preparation method thereof, which comprises iron, copper and manganese; the iron, copper and manganese are distributed in the layer plate metal central site in an atomic dispersion mode; the layer plate oxygen octahedron is in a non-symmetrical stretching distortion state; a 3.2-4.8 degree deviation is generated in the manganese oxygen copper bond angle in the layer plate; the lattice parameter a of the layer plate 110 crystal face direction is 0.305-0.312 nm; the molar ratio of copper to manganese is 1:2-1:5; and the molar sum of copper and manganese to the molar ratio of iron is 2:1-4:1. According to the application, the lattice non-symmetrical distortion induces the space overlap of the auxiliary metal and the iron active center orbit, an electron transfer path is constructed, the shielding effect of the hydroxyl ion on the iron active site under the alkaline environment is eliminated, the catalytic site activity is maintained, and stable and efficient catalytic treatment under wide pH working conditions is realized.

The application discloses a cross-linked polyaryl piperidine anion exchange membrane and a preparation method and application thereof, and relates to the technical field of anion exchange membranes. The anion exchange membrane takes polyaryl piperidine as a skeleton, introduces crown ether structure and a cross-linked network, and solves the technical problem that the balance between the hydroxyl ion conductivity and the dimensional stability is difficult in the existing anion exchange membrane. The anion exchange membrane comprises a specific structure of a repeating unit, is prepared through Friedel-Crafts superacid catalytic polymerization, Menshutkin reaction functionalization and Michael addition reaction cross-linking, and has excellent hydroxyl ion conductivity, dimensional stability, chemical stability and mechanical strength. The preparation method is simple in operation, fast in polymerization rate, and high in conversion rate, does not need to strictly control the temperature and oxygen of a reaction environment, is suitable for the field of water electrolysis hydrogen production, especially suitable for an anion exchange membrane water electrolysis system, and has a wide industrial application prospect.

This water electrolysis system comprises a water electrolysis cell, a differential pressure detection unit, and a differential pressure adjustment unit. The water electrolysis cell is provided with a negative electrode, a positive electrode, and an ion exchange membrane disposed between the negative electrode and the positive electrode, and generates hydrogen and hydroxide ions from an electrolyte fed to a negative electrode chamber between the negative electrode and the ion exchange membrane, and generates oxygen from the electrolyte fed to a positive electrode chamber between the positive electrode and the ion exchange film and from the hydroxide ions that have passed through the ion exchange membrane. The differential pressure detection unit detects differential pressure between the negative electrode chamber and the positive electrode chamber. The differential pressure adjustment unit adjusts the differential pressure between the negative electrode chamber and the positive electrode chamber on the basis of the differential pressure detected by the differential pressure detection unit.

The invention provides a microbubble-assisted iron-based catalyst oxidative degradation method, which comprises the following steps: pretreating a water body, introducing an iron-based catalyst, introducing microbubbles into the water body, and carrying out oxidative degradation. The micro-bubbles enrich a large amount of hydroxyl ions by using a huge gas-liquid interface potential difference, and provide a continuous electron donor environment for the iron-based catalyst, so that a non-traditional Fenton-like reaction is initiated and maintained, and hydroxyl radicals are efficiently and continuously generated under acidic or neutral conditions without adding hydrogen peroxide. The method overcomes the dependence of the traditional Fenton technology on a strong acid environment and a large amount of hydrogen peroxide, is low in operation cost, is environment-friendly, and is suitable for treating degradation-resistant organic wastewater, low-valence metal ion wastewater and the like.

The application provides a carbon dioxide capturing method. The carbon dioxide capturing method comprises the following steps: spraying an alkaline solution through a spraying structure, so that the alkaline solution flowing out of the spraying structure chemically reacts with carbon dioxide gas in a gas to absorb the carbon dioxide gas; buffering the solution after the chemical reaction with the carbon dioxide gas through a buffering structure, and making the solution buffered in the buffering structure flow out through the spraying structure; detecting the concentration of hydroxyl ions and / or the concentration of carbonate ions in the solution in the buffering structure in real time, and supplementing the alkaline solution or water in the buffering structure according to the concentration of hydroxyl ions and the concentration of carbonate ions; if the concentration of hydroxyl ions is less than or equal to m and the concentration of carbonate ions is n, stopping the operation of a circulating pump to make the solution buffered in the buffering structure enter an electrolysis device to be electrolyzed. The application effectively solves the problem that the capturing efficiency of carbon dioxide gas and the overall energy consumption of the carbon dioxide capturing system in the prior art are difficult to control.

The invention discloses a method for manufacturing electrode application composite ceramic electrolyte particles coated with a protective layer. The method comprises the following steps: step A, preparing a plurality of LLZO particles; putting the methanol and the hydrophobic material into a wet mixer for mixing and grinding to form first mixed slurry; step B, adding trimethylolamine and trimethylolamine hydrochloric acid into the wet mixer for continuous stirring, and enabling OH-bonds of the trimethylolamine to extend towards the outer surfaces of the LLZO particles and the hydrophobic material so as to form a hydroxide ion layer; the rotating speed in the step B must be greater than that in the step A; c, adding dopamine hydrochloric acid into the wet mixer, and continuously grinding and stirring; wherein the OH-bond of dopamine in the dopamine hydrochloric acid and the OH-bond of the hydroxide ion layer are subjected to a dehydration polymerization reaction, a dopamine layer is formed due to aggregation among dopamine, and the hydrophobic material is coated on the LLZO particles with the dopamine layer to form the composite LLZO particles.

The application discloses a preparation method of high-light water-based aluminum silver paste self-laminating paint, relates to the technical field of paint preparation, and comprises the following steps: adding water-based resin and modified silicon resin into a high-speed dispersion kettle, preliminarily mixing the water-based resin and the modified silicon resin after stirring to form a resin base, adding organic silicon additives, a thickening agent and a pH regulator into the resin base in sequence, stirring and adjusting the viscosity and the pH value of the system, immersing a substrate to be coated in an alkali solution of hydroxyl ions to remove surface grease and a loose layer, washing the substrate with water, immersing the substrate in an acid solution of hydrogen ions for treatment, finally washing the substrate with water and drying the substrate, removing residual solvents and moisture from the cooled reflection layer by soft drying, and obtaining the water-based aluminum silver paste paint with a self-laminating structure. According to the preparation method, the high-light water-based aluminum silver paste paint with the self-laminating structure is prepared by optimizing filler modification, resin proportioning, surface treatment and heating processes, and the paint can provide excellent reflection performance, and ensure the stability, uniformity and adhesion of the coating.

The invention discloses a method for treating polychlorinated nitrobenzene-containing wastewater by adopting calcium hydroxide alkaline hydrolysis. The method comprises the following steps: firstly, adding calcium hydroxide into wastewater containing polychlorinated nitrobenzene, carrying out hydrolysis reaction under stirring and temperature control conditions, carrying out nucleophilic substitution on activated chlorine substitution sites and nitro substitution sites in polychlorinated nitrobenzene molecules by utilizing hydroxyl ions to generate phenolic substances such as trinitrodichlorophenol and the like, and separating the phenolic substances to obtain the polychlorinated nitrobenzene-containing wastewater. Performing ultrasonic treatment on the first treatment liquid until the solution turns yellow and the chromaticity is not increased any more to obtain a first treatment liquid, and performing ultrasonic treatment, washing and filtering on the first treatment liquid to remove precipitated solids to obtain the treatment liquid. According to the method disclosed by the invention, the primary attenuation of the polychlorinated nitrobenzene-containing wastewater is realized, and the treatability of the wastewater is improved.

The application provides a method for preparing bismuth trioxide-cuprous oxide nanocomposite based on a synergistic reaction, which comprises the following steps: dispersing sodium bismuthate, sodium sulfite and cuprous chloride in deionized water to obtain a solid-liquid mixture; and placing the solid-liquid mixture under a hydrothermal condition, so as to in-situ prepare the Bi2O3-Cu2O nanocomposite through the synergistic effect of the redox reaction between sodium bismuthate and sodium sulfite in the system and the anion exchange reaction between cuprous chloride and hydroxyl ions generated in-situ. The application is based on the synergistic effect of the redox reaction and the anion exchange reaction under the same hydrothermal condition, and high-purity Bi2O3-Cu2O nanocomposite can be prepared in-situ in one step without adding an alkali source and a template agent. The prepared composite can effectively form a p-n heterojunction, significantly inhibit the recombination of photo-generated carriers, improve the photocatalytic activity and redox capacity of the material, and the preparation process is simple, green and economical, and easy for industrialized production.

The present application belongs to the technical field of fine chemical industry and water-based paint, and particularly relates to a use of adipic acid bis(1-butoxy-2-propyl) ester as a film-forming aid, a preparation method and a water-based paint composition. In view of the requirement of water-based paint for SVOC limit and the pain point that long open time and high paint film strength are difficult to be achieved simultaneously, constant azeotropic esterification is adopted to prepare non-SVOC odor-free target ester compounds. When the ester compounds are applied to water-based paint, the film-forming aid utilizes the specific large secondary methyl of the molecule to construct steric hindrance, effectively blocks the nucleophilic attack of hydroxyl ions, and solves the problem of alkaline catalytic hydrolysis of paint. The adipic acid bis(1-butoxy-2-propyl) ester has the following structure:

The invention discloses a tetraalkyl ammonium hydroxide wastewater treatment method based on an adsorption method, and relates to the technical field of wastewater treatment. According to the technical scheme, the electrode group is arranged in the middle flow channel, when the first fluid is input, the electrode group is electrified to generate an electric field, so that the electrode group adsorbs tetraalkylammonium ions and hydroxyl ions in the first fluid, and the obtained first treatment fluid is discharged, so that efficient treatment of the tetraalkylammonium hydroxide wastewater is completed; when the adsorption of the electrode group is saturated, a second fluid is input into the middle flow channel, and the electrode group is reversely electrified, so that the tetraalkylammonium ions and the hydroxyl ions adsorbed on the electrode group are released to the second fluid again, and a second treatment liquid is discharged, so that the recycling of the tetraalkylammonium hydroxide solution is realized, and the recycling of the tetraalkylammonium hydroxide solution is realized. The separation of the first treatment liquid and the tetraalkyl ammonium hydroxide in the tetraalkyl ammonium hydroxide wastewater is realized by regulating and controlling the electric field of the electrode group.

The present invention discloses an oxide ceramic particle coated with aminated functional groups, in which the particle is a plurality of composite LLZO particles, the composite LLZO particles comprising: an LLZO particle for directing and dispersing lithium ions passing through the positive electrode; the hydroxide ion layer is coated on the outer surface of the LLZO particle, so as to integrally form a secondary LLZO particle; a dopamine layer is coated outside the secondary LLZO particle, so that the composite LLZO particle is formed; the dopamine has a hydrophobic property, and can further protect the LLZO particles from being affected with damp. CTAB (Cetyltrimethyl Ammonium Bromide) is mixed in the dopamine layer and the hydroxide ion layer, and a CTAB layer is coated outside the dopamine layer.

The invention relates to the technical field of anion exchange membranes, in particular to an alkali-resistant anion exchange membrane based on fluorine-substituted overhang structure polyarylmethylpiperidine and a preparation method of the alkali-resistant anion exchange membrane based on fluorine-substituted overhang structure polyarylmethylpiperidine. The anion exchange membrane is prepared from a piperidine polymer and an E-51 cross-linking agent through a cross-linking reaction; the piperidine polymer is obtained by modifying a polyarylmethyl polymer through 4-methylpiperidine, and the dosage of the 4-methylpiperidine is 1.0 eq to 1.5 eq relative to a benzyl chloride group in the polyarylmethyl polymer; according to the invention, a fluorine-substituted pendent benzyl aromatic ring structure is designed, the strong electronegativity of fluorine atoms can enhance the molecular polarity, and formation of a continuous hydrophilic micro-region in a polymer matrix is promoted; meanwhile, a suspension structure enables a cationic group to be far away from a polymer main chain, so that the limitation of main chain steric hindrance on ion movement is reduced, and the hydroxyl ion conduction efficiency is greatly improved.

A method for producing one or more hydroxide solids includes providing a catholyte comprising an electrolyte solution; contacting the catholyte with an electroactive mesh cathode to electrolytically generate hydroxide ions, thereby precipitating the one or more hydroxide solid(s); and removing the one or more hydroxide solids from the surface of the mesh where they may deposit.

The invention provides a water electrolysis oxygen evolution catalyst and a preparation method and application thereof.The catalyst is obtained by adding a mixed solution of iridium trichloride trihydrate and sodium hydroxide into a Co3O4 dispersion solution for a reaction, and the chemical expression of the catalyst is Ir-OH / Co3O4, according to the water electrolysis oxygen evolution catalyst, hydroxide radicals of sodium hydroxide are used for replacing chloride ions of iridium trichloride trihydrate, so that iridium active sites are adjusted, and the activity of the catalyst is improved. Hydroxyl ions are introduced to replace chloride ions to adjust iridium active sites, so that the activity of the catalyst is improved. The electrocatalyst synthesized by the method is applied to oxygen evolution reaction (OER) and can show excellent electrocatalytic activity.

The application provides a method for synthesizing hydrotalcite, which comprises the following steps: taking metal aluminum as an anode, taking a hydrogen evolution catalyst as a cathode, taking a pre-configured inorganic hydroxide dispersion liquid as an electrolyte, and assembling an electrolytic cell; performing electrolysis reaction on the electrolytic cell under a preset voltage and a preset temperature, so that the cathode of the electrolytic cell generates hydrogen and hydroxyl ions through electrolysis, and the anode of the electrolytic cell generates aluminum ions through oxidation; and making the aluminum ions react with the inorganic hydroxide in the electrolytic cell under the action of the hydroxyl ions to generate the hydrotalcite. The application can solve the problems in the prior art, such as the need of using a large amount of inorganic salt as raw material, low atomic utilization rate, difficult control of the purity, particle size and morphology of the product, poor product performance, the need of high-temperature and high-pressure reaction conditions, and high energy consumption.

To provide a gas capturing agent which forms semi-clathrate hydrate and can contain much gas.SOLUTION: A gas capturing agent contains an ionic substance and water, and captures target gas. The ionic substance includes one or more cations of tri-n-butyl, n-hexyl ammonium cation, tri-n-butyl, n-pentyl phosphonium cation, tri-n-butyl, n-hexyl phosphonium cation, tri-iso-butyl and n-hexyl ammonium cation, and one or more anions of bromide ion, chlorine ion, fluorine ion and hydroxyl group ion.SELECTED DRAWING: Figure 4

This invention belongs to the field of materials synthesis technology, specifically relating to an aluminum-based metal-organic framework powder material and its preparation method. The preparation method includes the following steps: mixing organic ligand powder and slightly soluble alkali powder, adding water, stirring and mixing, and ultrasonically dispersing to obtain a uniform emulsion; mixing aluminum salt with water and stirring to obtain an aluminum salt aqueous solution; adding the aluminum salt aqueous solution to the uniform emulsion, stirring and ultrasonicating to obtain a mixed solution; heating the mixed solution under reflux, filtering to remove filter residue, washing with water, washing with alcohol, drying, and vacuum activation to obtain the aluminum-based metal-organic framework powder material. The slightly soluble alkali used in this method can slowly release hydroxyl ions during the heating synthesis of the aluminum-based metal-organic framework powder material, forming a dynamic slightly alkaline environment, slowing down the deprotonation rate of the organic ligands, which is beneficial to improving the crystallinity of the material, forming a material with a regular pore structure, and enhancing the adsorption performance of the material.

The invention belongs to the technical field of hydroxyl conductive polymer materials, and discloses a flexible aryl piperidine type anionic binder as well as a preparation method and application thereof. According to the binder, a flexible aromatic structure unit is introduced into a polymer main chain, so that the flexibility of the main chain is effectively regulated and controlled, and the compatibility and dispersity of the binder and a metal oxide catalyst are improved; meanwhile, a proper amount of branching agent is introduced to inhibit chain segment accumulation and swelling effects caused by high flexibility, so that the size stability and the mechanical strength are both considered. The anion exchange binder obtained by the method has high chemical stability, high dispersity and high interface regulation and control capability at the same time. The obtained anionic binder solution and metal oxide catalyst particles are prepared into uniform catalyst ink, and a catalyst layer covered with the flexible anionic binder is obtained through the catalyst ink. The catalyst layer can realize uniform distribution of catalyst particles, and can remarkably optimize a gas-liquid-solid three-phase interface, so that the catalyst utilization rate and the oxygen evolution reaction performance are effectively improved.

A process for the production of small crystal forms of zeolite SSZ-81 is disclosed. The method includes forming a reaction mixture comprising an alumina coated silica sol, an alkali metal source, a structure directing agent comprising a 1, 5-bis (N-methylpiperidinium) pentane dication and / or a 1, 5-bis (1-azonium-bicyclo [2.2. 2] octane) pentane dication, a hydroxyl ion source, and water; and subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the zeolite. Compositions prepared according to the method and various uses of the compositions are also disclosed.

The invention discloses a combined negative electrode additive for a zinc-bromine flow battery, a negative electrode electrolyte, a preparation method of the negative electrode electrolyte and the zinc-bromine flow battery, and belongs to the technical field of electrochemical energy storage, and the combined negative electrode additive for the zinc-bromine flow battery comprises indium trichloride and glycine in a molar ratio of 1: (3.33-60); during charging, indium ions in indium trichloride are reduced into metal indium on the surface of the electrode, the metal indium and the post-deposited zinc generate a nanoscale alloy layer in situ, electric field distribution is homogenized, and zinc dendritic crystal growth is inhibited; carboxyl and amino of glycine are used as electron donors to form a water-soluble complex with zinc ions, so that the reduction kinetics of the zinc ions on the surface of the electrode is slowed down; polar functional groups of glycine are adsorbed on active sites on the surface of a zinc electrode, zinc ion deposition is blocked, energy distribution of the electrode and an electrolyte interface is changed, zinc is guided to perform transverse two-dimensional growth, zinc dendrite growth is inhibited, hydroxyl ions are neutralized, and hydrogen evolution reaction is inhibited. The coulombic efficiency of the zinc-bromine flow battery is 95.4%-97.0%; the energy efficiency ranges from 81.85% to 84.49%; and the voltage efficiency is 85.8%-87.1%.

The invention provides silicon-based negative electrode slurry and a preparation method thereof, a negative electrode plate and application, and belongs to the technical field of battery materials, the silicon-based negative electrode slurry comprises a pre-lithiated siloxy material, a conductive agent, a binder, maleic acid and a solvent; the mass of the maleic acid is 2.57%-11% of the mass of the pre-lithiated siloxy material. By introducing the maleic acid with a specific content, the reaction of silicon and hydroxyl can be reduced to inhibit hydrogen production, and the situation that the uniformity and stability of the slurry are damaged by excessive hydrogen is avoided; and secondly, chemical reaction with active groups on the surface of the pre-lithiated siloxy material can be carried out to form stable chemical bonds to generate a steric hindrance effect, so that aggregation of the silicon-based negative electrode material is prevented, the viscosity of the slurry is reduced, and the uniformity and stability of the slurry are improved. In addition, due to the introduction of maleic acid, the peel strength of the negative pole piece can be remarkably improved, and the battery performance is also remarkably improved.

The application relates to the field of road materials, in particular to a grass-inhibiting and soil-stabilizing lime-soil-stone mixed material for field roads and a construction method thereof. The grass-inhibiting and soil-stabilizing lime-soil-stone mixed material for field roads comprises the following components in parts by weight: lime 8-12 parts, clay 20-25 parts, crushed stone 50-60 parts, fly ash 15-20 parts, silica ash 5-8 parts, ferric chloride 2-3 parts and water 12-18 parts. The application can inhibit the growth of weeds and improve the overall strength of the mixed material by adding ferric chloride and silica ash and the cooperation of other components, wherein the ferric chloride can inhibit the enzyme activity of root systems by releasing iron ions, and can generate iron hydroxide colloid to wrap weed seeds and block the oxygen required for germination; the silica ash can continuously release hydroxyl ions to maintain alkalinity and improve the material density to compress the growth space of weed roots.

The present application relates to a preparation method of high-purity lithium sulfide, and belongs to the technical field of lithium sulfide preparation. The present application solves the technical problem of providing a preparation method of high-purity lithium sulfide. The method comprises the following steps: a, mixing and grinding a sulfur source and a lithium source, mixing the ground material with hydrazine hydrate to obtain a reaction material; b, mixing and reacting to obtain lithium sulfide slurry; c, heating the lithium sulfide slurry to 100-120 DEG C, drying for 1-2 hours, then adding sulfur powder and anhydrous hydrazine, heating to 400-410 DEG C, drying for 1-2 hours to obtain high-purity lithium sulfide powder. The present application is prepared by a simple reaction operation, one-pot method, after stage heating and drying and feeding, the lithium sulfide is reacted twice, the product purity can reach more than 99.9%, and the hydroxyl ion content is less than 0.01%. The method for preparing lithium sulfide is simple in process, strong in operability, low in energy consumption, can be produced on a large scale, has no secondary pollution, can meet the requirements of safe operation and commercialization of high-purity lithium sulfide, and can meet the requirements of safe operation and commercialization of high-purity lithium sulfide.

The application provides a process for coupling preparation of oxygen, hydrogen and lithium hydroxide by electrolysis of lithium sulfate solution, which comprises a two-chamber-membrane electrolysis system with an anode chamber, a cathode chamber and a cation exchange membrane, uses lithium sulfate aqueous solution as an anode solution and lithium hydroxide aqueous solution as a cathode initial bottom solution, and realizes synchronous coupling preparation of oxygen and lithium hydroxide by controlling electrolysis parameters and electrolyte circulation, so that the anode generates oxygen by water oxidation and oxygen evolution reaction, the cathode generates hydrogen by reduction reaction, lithium ions migrate from the anode chamber to the cathode chamber through the cation exchange membrane, combine with hydroxyl ions to generate lithium hydroxide, and the like. After electrolysis, the anode post-solution is recycled as a dilute sulfuric acid solution, hydrogen is collected from the cathode, and lithium hydroxide solution is obtained. The application breaks through the limitations of single electrolysis product of lithium sulfate solution and low value of anode by-products, realizes coupling production of high-purity oxygen, hydrogen and lithium hydroxide, is clean in process, has no harmful gas emission, realizes closed-loop circulation of anode solution, and is easy to be applied to continuous industrial application.

The application discloses a self-driven oxygen purification battery system and application thereof, which comprises a cathode gas diffusion electrode, an ion exchange membrane, an anode oxygen evolution electrode and a dehydration dryer. The cathode chamber is filled with acidic electrolyte, and the anode chamber is filled with alkaline electrolyte. The cathode gas diffusion electrode is loaded with an acidic oxygen reduction catalyst for selectively catalyzing the oxygen reduction reaction from air containing nitrogen, carbon dioxide and oxygen; and the anode oxygen evolution electrode is loaded with a non-noble metal oxygen evolution catalyst for catalyzing the oxidation of hydroxyl ions to generate oxygen. The application utilizes the ion concentration difference formed by the acid / alkali double electrolyte as a driving force, and the theoretical open circuit voltage can reach pH*0.059 V. The system can purify oxygen in air to a purity of more than 99% while spontaneously generating electricity, and the acidic environment on the cathode side effectively avoids the interference of carbon dioxide in air. The system has great application prospects in the fields of medical oxygen supply, deep-sea diving, highland operation and the like.

The purpose of the present invention is to provide an air electrode / separator assembly exhibiting high activity as an electrode while having an extremely thin air electrode layer. This air electrode / separator assembly comprises: a hydroxide ion conduction separator that contains a hydroxide ion conduction solid electrolyte; and an air electrode layer that is provided on one surface side of the hydroxide ion conduction separator, and that contains an air electrode material and has a thickness of 2000 nm or less. The air electrode material is a material having both functions of an air electrode catalyst and an electron conductive material, and includes at least one metal element selected from the group consisting of Ni, Fe, Co, Mn, V, Mo, W, Cr, Pt, and Pd in at least one kind selected from the group consisting of (i) a metal carbide, (ii) a metal in which carbon is solid-dissolved, and (iii) a mixture of amorphous carbon and metal particles.