16 results about "Iron redox" patented technology

The invention discloses an aqueous all-iron flow battery negative electrode electrolyte and an aqueous all-iron flow battery, and belongs to the fields of an electrochemical energy storage technology and a flow battery. The aqueous total iron flow battery negative electrode electrolyte comprises an iron ion-containing active substance, a first complexing agent, a second complexing agent and hydrogen evolution inhibitor, a supporting electrolyte and water, and the first complexing agent and the second complexing agent and hydrogen evolution inhibitor are simultaneously combined to iron ions to form a stable chelate with a saturated six-coordinate structure. The first complexing agent is selected from triethanolamine or analogues thereof, and the second complexing agent and hydrogen evolution inhibitor is selected from organic acids having a chelation effect and salts thereof. According to the invention, two complexing agents are combined with the same iron ion at the same time to form a stable six-coordinate structure, so that the problems of capacity fading, low energy efficiency and poor cycling stability caused by iron separation and hydrogen separation due to dissociation of organic matters and ferrous ions in the operation process of the battery are effectively relieved.

The invention discloses a flow battery proton exchange membrane, and particularly discloses a flow battery proton exchange membrane which is prepared by sequentially soaking a substrate material in a water phase solution and an organic phase solution, generating a skin layer film through interfacial polymerization, and then performing ultraviolet irradiation and post-treatment. 3, 3 '-diaminobiphenyl and an organic monomer are subjected to interfacial polymerization reaction on the surface of a substrate material, the proton exchange membrane with a cross-linked structure is formed through ultraviolet irradiation, and the proton exchange membrane is thin in separation layer, resistant to acid and alkali and good in chemical stability. The proton exchange membrane for the redox flow battery can be applied to an all-vanadium redox flow battery, an iron / chromium redox flow battery, a zinc / bromine redox flow battery, a sulfur / bromine redox flow battery, a sulfur / iron redox flow battery, a vanadium / bromine redox flow battery or a vanadium / iron redox flow battery.

A modification method for a carbon felt electrode of an all-iron redox flow battery, comprising the following steps: 1) placing carbon felt into a tubular furnace for firing; 2) preparing a Fe2(SO 4)3 methanol solution and a dimethylimidazole methanol solution; 3) placing the heat-treated carbon felt into the dimethylimidazole methanol solution, and then pouring the Fe2(SO4)3 methanol solution into the solution; 4) stirring the mixed solution and the carbon felt, and then taking out and drying the mixed solution and the carbon felt; 5) placing the dried carbon felt into the tubular furnace, and firing the dried carbon felt in a nitrogen atmosphere; and 6) taking out the fired carbon felt, cleaning with hydrochloric acid, then cleaning with deionized water, and drying after the cleaning to obtain a modified carbon felt electrode. The method is used for modifying the carbon felt electrode of the all-iron redox flow battery, and the hydrophilicity and the electrochemical activity of the carbon felt electrode can be improved by means of soaking and stirring in the solution and firing in the tubular furnace, effectively improving the voltage efficiency of the all-iron redox flow battery.

The invention relates to the technical field of sewage treatment, and discloses a preparation method of a porous ceramic loaded sulfur-based composite filler and application of the porous ceramic loaded sulfur-based composite filler in nitrogen and phosphorus removal of sewage. Porous ceramic is taken as a carrier, active components are loaded in a layered manner by adopting a gradient filling process, an inner-layer siderite composite gel and calcite complex dynamically neutralizes H < + > generated by sulfur autotrophy, and pH buffering is realized through sulfo group reversible proton exchange; the compressive strength of the middle-layer pyrite composite gel is improved through C-O-Fe bonding, a Pi-Pi conjugate electron pathway is constructed by polypyrrole-coated hybrid gel, electron transfer is accelerated, and Fe < 2 + > is released to precipitate phosphate; sulfur-charcoal on the outer layer forms nano sulfur crystals, and denitrification is quickly started by utilizing a high specific surface area. Sulfur consumption and sulfate accumulation are reduced through sulfur-iron oxidation-reduction circulation. The filler realizes high-efficiency nitrogen and phosphorus removal of sewage under the condition that a carbon source and a pH regulator are not required to be additionally added.

The invention provides a medium-entropy doped sodium ion battery positive electrode material and a preparation method and application, the medium-entropy doped sodium ion battery positive electrode material comprises a matrix and a carbon coating layer on the surface of the matrix, the chemical formula of the matrix is Na4Fe3-x-y-zMnxMgyCuz (PO4) 2P2O7, 0.05 < = x < = 0.15, 0.01 < = y < = 0.05, 0.01 < = z < = 0.05, and the carbon coating layer is derived from a biomass carbon source. According to the medium-entropy-doped sodium ion battery positive electrode material, Mn, Mg and Cu with specific contents are doped, so that the iron redox reversibility can be enhanced, the charge transfer resistance can be reduced, the sodium ion diffusion coefficient can be improved, the band gap and the sodium ion migration barrier can be reduced, the lattice volume change can be reduced, and the crystal structure can be stabilized; meanwhile, by coating the carbon coating layer derived from the biomass carbon source, the conductivity of the material can be improved, and the cost is reduced.

The present invention relates to the field of electrode materials for capacitive deionization desalination systems, and particularly relates to a preparation method and application of a core-shell heterostructure Prussian blue-based compound. In the present invention, Fe[Fe(CN)6] is used as the core, and a Ni3[Fe(CN)6]2 shell layer is epitaxially grown on its surface, and Fe[Fe(CN)6]@Ni3[Fe(CN)6]2 with different shell thicknesses is obtained by regulating the concentration of the precursor. The present invention reduces the vacancy defects in Fe[Fe(CN)6] through a dual repair strategy, and increases the active sites for storing sodium ions. A stable Ni3[Fe(CN)6]2 shell layer is epitaxially grown with Fe[Fe(CN)6] as the core, which can effectively inhibit the dissolution of the inner core. At the same time, the energy required for the low-spin iron redox reaction in the inner core is reduced through the interface effect, and the electrochemical performance of the core-shell heterostructure is greatly improved.

This application relates to the field of wastewater treatment technology, and discloses a method for preparing porous ceramic-supported sulfur-based composite packing and its application in wastewater denitrification and phosphorus removal. Using porous ceramic as a carrier, a gradient filling process is employed to load active components in layers. The inner layer of siderite composite gel and calcite composite dynamically neutralizes the H+ generated by sulfur autotrophy. + pH buffering is achieved through reversible proton exchange of sulfonic acid groups; the middle-layer pyrite composite gel enhances compressive strength through C-O-Fe bonding, and the polypyrrole-coated hybrid gel constructs a π-π conjugated electron pathway, accelerating electron transfer and releasing Fe. 2+ Phosphate is precipitated; the outer layer of sulfur-biochar forms nano-sulfur crystals, rapidly initiating denitrification due to its high specific surface area. Sulfur consumption and sulfate accumulation are reduced through a sulfur-iron redox cycle. This packing material achieves highly efficient nitrogen and phosphorus removal from wastewater without the need for external carbon sources or pH adjusters.

An all-iron redox flow battery comprising a first electrolyte tank configured to contain a first electrolyte solution and a second electrolyte tank configured to contain a second electrolyte solution; a flow cell comprising a negative flow half-cell configured for passing through first electrolyte solution and a positive flow half-cell configured for passing through second electrolyte solution; a third electrolyte tank, distinct from the first and second electrolyte tanks, configured to contain a third electrolyte solution, wherein the battery is configured to selectively provide fluid communication of the third electrolyte tank with at least one of the first electrolyte tank and the second electrolyte tank; and a rebalancing cell comprising a negative rebalancing half-cell and a positive rebalancing half-cell, wherein the negative rebalancing half-cell is configured to receive hydrogen gas from the first electrolyte tank and / or from a separate hydrogen source, and wherein the positive rebalancing half-cell is configured for passing through third electrolyte solution, whereby the rebalancing cell is configured to lower a pH of the third electrolyte solution.

The invention belongs to the technical field of flow batteries, and provides a method for prolonging the cycle life of a ferrous sulfide redox flow battery, and the method specifically comprises the following steps: (1) drawing an absorbance curve of a standard ferrous sulfide redox flow battery as a standard curve; (2) taking a to-be-detected ferrous sulfide redox flow battery, and drawing an absorbance curve of which the SOC is lower than that of the standard ferrous sulfide redox flow battery; and (3) when the peak value of the absorbance curve of the ferrous sulfide redox flow battery to be detected at the characteristic absorption wavelength of the polysulfide ions is lower than that of the standard curve, replacing the electrolyte on the sulfur side of the battery with a fresh electrolyte. According to the ultraviolet determination method for the concentration of the sulfur-iron battery electrolyte, special instruments are not needed, the operation process is simple and rapid, assistance of other chemical reagents is not needed, the analysis result is accurate and reliable, and the effect of prolonging the service life of the battery is achieved by supplementing active ions in the sulfur-side electrolyte.

The application discloses a sewage treatment device and method based on membrane filament oxygen supply and electrode synergistic effect of iron redox conversion, the device comprises a reactor, an electrode unit, an oxygen supply membrane unit, an iron base unit, a separation unit and a gas supply system. The oxygen supply membrane and the iron base unit are alternately arranged at a micro distance of 0.5-5 mm to form an iron-oxygen alternating interface; the electrode unit and the oxygen supply membrane unit are separated by the separation unit to form redox subareas. The application utilizes the migration and conversion of iron ions between aerobic and anaerobic zones to construct a non-contact electron transfer path, realizes simultaneous nitrification, denitrification and chemical phosphorus removal; the micro distance iron-oxygen interface can limit the initiation of efficient electro-Fenton reaction to produce hydroxyl radicals and strengthen the degradation of difficult-to-degrade organic matters such as pyrethroid. The application integrates biological denitrification, chemical phosphorus removal, advanced oxidation and biological electricity generation functions, has the advantages of high treatment efficiency, low energy consumption, stable operation and the like, and is especially suitable for treating industrial wastewater containing difficult-to-degrade organic matters.

The application belongs to the field of environmental microorganism culture and sludge resource utilization, and relates to a Desulfobulbaceae The application discloses a cable bacteria strain and application thereof, and a 16S rRNA gene sequence of the cable bacteria strain is shown as SEQ ID NO:1. The strain can couple a sulfide oxidation process and an oxygen reduction process in sludge, can adapt to a complex oxidation-reduction environment in the sludge system, can form a stable vertical oxidation-reduction gradient in the sludge system, and can couple a deep sulfide oxidation process and a surface oxygen reduction process through long-distance electron transfer. The strain can promote migration and oxidation conversion of sulfide in the sludge from a deep layer to a surface layer, and can reduce local sulfide accumulation. Meanwhile, the strain can affect spatial distribution of Fe(II) / Fe(III) in the sludge system, and can promote iron oxidation-reduction circulation and a sulfur-iron coupling process.

The invention provides an electrolyte for use in an all-iron redox flow battery, comprising an aqueous solution of an Fe2+ salt; a first cation additive being aluminium Al3+; and a second cation additive selected from the group consisting of Na+, K+, Ca²⁺, Mg²⁺ or NH4 +.

The invention relates to a new electrolyte involving iron salts to be used as anolyte and / or catholyte in an all-iron hybrid redox flow battery. Said electrolyte, as well as iron salts in high concentration, comprises various additives that grant key properties such as stability, balanced pH, and ionic conductivity (needed to avoid salt precipitation), and also inhibit H2 evolution / generation thus enabling good quality iron platting. Therefore, the field of the invention is the iron redox flow battery industry.

The invention relates to a new electrolyte involving iron salts to be used as anolyte and / or catholyte in an all-iron hybrid redox flow battery. Said electrolyte, as well as iron salts in high concentration, comprises various additives that grant key properties such as stability, balanced pH, and ionic conductivity (needed to avoid salt precipitation), and also inhibit H2 evolution / generation thus enabling good quality iron platting. Therefore, the field of the invention is the iron redox flow battery industry.

The invention discloses an alkaline total-iron flow battery negative electrode electrolyte and a preparation method thereof, and relates to the technical field of redox flow batteries, an iron ion complexing preparation alcohol amine series ligand adopted in the alkaline total-iron flow battery negative electrode electrolyte is of a multi-tooth chelation structure and contains more than two hydroxyl groups (-OH) and one amino group (-NH-), and the iron ion complexing preparation alcohol amine series ligand is of a multi-tooth chelation structure and contains more than two hydroxyl groups (-OH) and one amino group (-NH-). The complexing preparation and iron ions can form a stable complex with Fe < 3 + > / Fe < 2 + > through O-N-O multidentate sites, the complexing constant is far higher than that of a traditional organic ligand, and the cycling stability of the negative electrode electrolyte is greatly improved. The molecular size of a complex formed by the ligand and iron ions is relatively large, the permeability through an ion exchange membrane is greatly reduced, cross contamination of positive and negative electrode electrolytes is avoided, excellent electrochemical activity and stability are achieved, and the prepared high-concentration active iron electrolyte also has excellent stability.

The invention belongs to the technical field of redox flow batteries, and provides an alkaline aqueous all-iron flow battery negative electrode electrolyte. The negative electrode electrolyte adopts a full water-soluble design, a triple synergistic mechanism is constructed through molecular engineering, and the negative electrode electrolyte is composed of an iron-based active substance, a stabilizer, a difunctional organic ligand, an alkaline supporting electrolyte and a conductive enhancer; the total concentration of the difunctional organic ligand is regulated and controlled to be 1.0-2.0 mol / L. According to the invention, a multifunctional organic ligand is introduced to optimize a negative electrode electrolyte system, so that stable coordination of iron ions and double improvement of redox capacity of the electrolyte under an alkaline condition are realized. The system comprises an iron active material, a redox active organic ligand, a supporting electrolyte and an auxiliary electrolyte. Experiments show that the cycle life and the capacity density of an all-iron flow battery constructed based on the electrolyte are improved by about 40% compared with those of a traditional system.