17 results about "Potassium ferricyanide" patented technology

The application discloses an anti-caking salt product and a preparation method thereof. The anti-caking salt product comprises raw salt and an anti-caking agent, the anti-caking agent is food-grade ferric tartrate, and the addition amount of the anti-caking agent is 0.05-0.106 g / kg of the salt. The core of the anti-caking method of the salt lies in that the food-grade ferric tartrate is used as the main anti-caking agent, the addition amount is 0.05-0.106 g / kg of the salt, the salt is dried at 100 DEG C for 4 hours, then the anti-caking agent is added, and the water vapor transmission rate is less than or equal to 0.5 g / m 2 24h of high-barrier material packaging, while 6 g of quicklime or 2 g of calcium chloride desiccant is added in every 200 g of the salt. The application also controls the Mg 2+ content in the salt to be less than or equal to 0.02%, the KCl content to be less than or equal to 10%, and the particle size to be in the range of 0.45-0.6 mm, so that the salt caking is synergistically inhibited from multiple dimensions. The method has extremely significant anti-caking effect (the caking rate is only 8.7% after 15 days of open storage), is safe and economical, and has a simple process, and can effectively replace or reduce the use of potassium ferrocyanide, and is suitable for large-scale industrial production.

This invention discloses a copper hexacyanoferrate-potassium heptacopper sulfide composite electrode material, its preparation method, and its application, belonging to the field of electroanalytical sensing material preparation technology. This invention uses a hydrothermal synthesis method to prepare potassium heptacopper sulfide. Subsequently, the potassium heptacopper sulfide-modified electrode is placed in an electrolyte solution containing potassium ferricyanide, and in-situ electrosynthesis is performed using cyclic voltammetry. This allows the hexacyanoferrate ions and copper ions present in the electrolyte to react and generate water-insoluble copper hexacyanoferrate, which grows in situ on the electrode surface, resulting in the copper hexacyanoferrate-potassium heptacopper sulfide composite electrode material. In this material, potassium heptacopper sulfide serves as a conductive substrate, and copper hexacyanoferrate serves as a redox probe. This composite electrode material can be used to construct an electrochemical sensor containing a molecularly imprinted layer, which exhibits high sensitivity, high specificity, a wide detection range, and good stability.

This invention belongs to the field of high-entropy transition metal coordination polymer technology, specifically relating to a high-entropy Prussian blue material, its preparation method, and its applications. The invention involves dissolving various hydrated inorganic metal salts and sodium citrate complexing agent in water, slowly adding potassium ferricyanide solution dropwise to this solution, and then stirring for 30 min. The resulting solution is allowed to settle at room temperature for 24 h, washed three times by centrifugation with deionized water, and then washed three times by centrifugation with ethanol to obtain the high-entropy Prussian blue material Cu. 0.2 Ni 0.2 Co 0.2 Mn 0.2 Zn 0.2 (Fe(CN)6) 0.667 This invention yields a high-entropy Prussian blue electrocatalyst that is simple to synthesize, structurally stable, and uses readily available raw materials. This electrocatalyst can be applied to the electrocatalytic reduction of nitrate, laying the foundation for developing other high-entropy transition metal coordination compounds with framework structures as electrocatalysts for the electrocatalytic synthesis of value-added chemicals from nitrate.

The application belongs to the technical field of capacitors, and discloses a nickel-iron Prussian blue supercapacitor electrode material, a preparation method thereof and a supercapacitor, which comprises the following steps: dissolving nickel chloride hexahydrate, iron trichloride hexahydrate and trisodium citrate dihydrate in water to obtain reagent A, dissolving potassium ferricyanide in water to prepare a solution to obtain reagent B; slowly adding reagent B into reagent A under room temperature, stirring, and then placing the mixed solution under room temperature, washing, centrifuging, collecting the precipitate, and vacuum drying to obtain a nickel-iron Prussian blue material PBA; by adjusting the amount of trisodium citrate and the ratio of nickel to iron, the two play a synergistic role to achieve the effect of high specific capacitance (140.25 F·g ‑1 ) and cycle stability (84.35% retention rate after 2000 cycles), and when the two synergistically act, the structural stability and redox activity of the material can be effectively enhanced, and finally the balance between high specific capacitance and excellent cycle stability is achieved.

This application discloses a method for preparing a high-entropy Prussian blue analogue composite flexible electrode material and a sodium-ion hybrid capacitor. First, disodium hydrogen phosphate, p-toluenesulfonic acid monohydrate, and pyrrole are dissolved in deionized water. Constant current electrochemical polymerization is then performed using carbon cloth as the working electrode to grow polypyrrole nanofibers in situ on its surface. Subsequently, high-temperature carbonization is carried out under an argon atmosphere to obtain a nitrogen-doped carbon nanofiber / carbon cloth substrate. Then, manganese salt, cobalt salt, nickel salt, copper salt, and iron salt are mixed with sodium citrate to prepare a mixed solution, which is then reacted with potassium ferricyanide solution. After aging, washing, and drying, a high-entropy Prussian blue analogue-loaded composite cathode material is obtained. This application constructs a hierarchical composite structure integrating flexible support, rapid conductivity, and efficient sodium storage, which can effectively shorten the ion diffusion path, improve the electron transport rate, and alleviate structural distortion during charging and discharging.

This invention relates to the field of flow battery technology, specifically to a neutral flow battery based on Prussian blue targeted activation and its activation threshold control method. The battery uses potassium ferrocyanide / potassium ferricyanide as the dielectric molecule, Prussian blue as the solid energy storage material, and potassium chloride as the neutral electrolyte. The different volumes of the positive and negative electrolytes constitute a capacity-limited system. Experiments determined that a potassium ferrocyanide concentration ≥0.3M is the minimum activation threshold concentration for Prussian blue, and the optimal addition amount of Prussian blue is 10%–20% of the molar amount of potassium ferrocyanide. This control method avoids ineffective accumulation of solid materials. In neutral iron-sulfur full cells, the coulombic efficiency is significantly improved from 55%–85% to 97%–98%, and remains stable within 10 cycles, effectively improving the battery's capacity, reaction reversibility, and long-term stability.

This invention relates to the field of cesium ion adsorption materials, specifically to an acid-controlled copper-based Prussian blue analogue, its preparation method, and its application. The invention provides a method for preparing an acid-controlled copper-based Prussian blue analogue, comprising: adding potassium ferrocyanide solution to a mixture of polyvinylpyrrolidone and a copper salt solution, followed by stirring and aging to obtain particulate copper-based Prussian blue analogue; adding the particulate copper-based Prussian blue analogue to a mixture of acid and N,N-dimethylformamide, followed by heating to obtain an acid-controlled copper-based Prussian blue analogue. This invention utilizes acid control to induce new structures and more adsorption sites in the copper-based Prussian blue analogue, thereby achieving selective and efficient adsorption of cesium ions in water, significantly reducing the interference of sodium ions on cesium ion adsorption, and making it more stable in solution.

The application belongs to the technical field of sensor preparation, and particularly relates to a high-entropy Prussian blue analogue, a preparation method and application thereof, and a working electrode. The preparation method provided by the application carries out a precipitation reaction on transition metal salt, potassium ferricyanide and a chelating agent through a microreactor to form a single lattice randomly occupied, which can provide an ideal maximum doping model. The obtained high-entropy Prussian blue analogue has four core effects of high-entropy materials, such as a high-entropy effect, lattice distortion, slow diffusion characteristics and a 'cocktail' effect. Meanwhile, due to the reasons of an entropy stable structure, a synergistic effect and a continuous active area provided by a highly disordered atomic distribution, the high-entropy Prussian blue analogue material has excellent catalytic performance, and when the high-entropy Prussian blue analogue is used as a modified electrode material to prepare a working electrode for electrochemical detection of dopamine, excellent detection sensitivity is exhibited.

The application belongs to the field of self-powered materials, and discloses an ionic thermoelectric gel, a preparation method thereof and a flexible self-powered thermoelectric device, comprising the following steps: adding polyvinyl alcohol, sodium alginate and calcium chloride into a mixed system of deionized water and glycerol to obtain solution A; adding sodium citrate into the solution A to obtain solution B; adding potassium ferricyanide and potassium ferrocyanide into the solution B to obtain solution C; and freezing and thawing the solution C to obtain a shaped gel; and soaking the shaped gel in a sodium citrate solution to obtain the ionic thermoelectric gel. Through the multi-dimensional innovative design of the double-network matrix construction, the sodium citrate multi-regulation and the double thermoelectric mechanism synergy, the core problems of the poor mechanical adaptability, the insufficient power transmission stability and the weak long-term service ability of the existing ionic thermoelectric gel are improved, the dynamic deformation demand of the human body movement is adapted, the continuous discharge under the small temperature difference of the human body is realized, and the long-life synergistic optimization of the mechanical properties and the power transmission performance is realized.

This invention discloses a method for preparing an anti-caking salt product and the resulting anti-caking salt product. The anti-caking salt product includes raw salt and an anti-caking agent, wherein the anti-caking agent is food-grade calcium silicate, and the amount of anti-caking agent added is 10-20 g / kg of salt. The core of the anti-caking method for salt is: using food-grade calcium silicate as the main anti-caking agent, adding it at an amount of 10-20 g / kg of salt, after the salt has been dried at 100°C for 4 hours, and using a water vapor permeability ≤0.5 g / m³. 2 • High-barrier material packaging for 24 hours, with 6g of quicklime or 2g of calcium chloride desiccant added per 200g of salt. This invention also controls the magnesium content in the salt. 2+ With a salt content ≤0.02%, KCl content ≤10%, and particle size within the range of 0.45~0.6mm, this method synergistically inhibits salt agglomeration from multiple dimensions. The method exhibits extremely significant anti-agglomeration effects (agglomeration rate is only 4.7% after 15 days of storage), is safe and economical, and has a simple process. It can effectively replace or reduce the use of potassium ferrocyanide and is suitable for large-scale industrial production.

This invention belongs to the technical field of thermoelectric materials and functional polymer materials, specifically relating to a thermoelectric hydrogel based on the synergistic enhancement of zwitterionic and polar solvents, its method, and applications. The thermoelectric hydrogel is obtained by polymerizing a precursor solution to form a gel matrix, followed by immersion in an immersion solution to introduce a potassium ferrocyanide / potassium ferrocyanide redox couple. The precursor solution is prepared by mixing acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N,N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, the zwitterionic monomer [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide, the crosslinking agent N,N'-methylenebisacrylamide, a photoinitiator, and deionized water. This invention prepares a thermoelectric hydrogel with high mechanical strength, high ductility, and a high Seebeck coefficient, and also exhibits good temperature resistance.

This invention discloses a rapid visual identification method and kit for the vintage of buckwheat liquor based on a dual-channel colorimetric reaction. Addressing the issue of counterfeit vintage in buckwheat liquor, it sets up two independent detection channels: the first channel uses a solid-phase extraction column with a mixture of polyamide and uncapped C18 filler or uncapped C18 filler to remove flavonoid interference, controlling the sample flow rate through the column at 0.8~1.2 mL / min, and uses a p-toluenesulfonic acid-p-dimethylaminobenzaldehyde solid colorimetric strip to detect the aging year of the base liquor for 2~5 minutes; the second channel uses ferric chloride-potassium ferricyanide colorimetric paper to detect the aging time based on the negative correlation between reducing substances and bottle storage time. The dual-dimensional results comprehensively determine the authenticity of the vintage label. This invention is safe to operate, provides intuitive results, and offers strong anti-counterfeiting features with dual verification, making it suitable for various scenarios such as consumer self-inspection, liquor company quality control, and market supervision.

The application discloses a detection structure capable of quickly identifying ferroferric oxide, and a preparation method and application thereof. The detection structure comprises a base body, and potassium ferricyanide and ammonium thiocyanate which are respectively adsorbed on opposite ends of the base body. The detection structure can quickly identify whether the ferroferric oxide is contained in a to-be-detected substance. The detection structure has low detection limit, high accuracy and simple operation.

This invention discloses a composite metal oxide electrode material, its preparation method, and a supercapacitor, belonging to the field of capacitor technology. The preparation method includes: dissolving cobalt chloride and trisodium citrate in deionized water to prepare solution A; dissolving potassium ferricyanide in deionized water to prepare solution B; adding solution B dropwise to solution A and allowing the reaction to proceed to obtain a CoHCF precursor; calcining the CoHCF precursor to obtain the composite metal oxide electrode material. This invention utilizes a Prussian blue analogue-derived composite metal oxide to effectively enhance the pseudocapacitive properties and cycle stability of the material. Trisodium citrate is used as a complexing agent to control the metal ion release rate, enabling cobalt and iron ions to form a more stable complex. Furthermore, this invention optimizes the electrochemical performance of the electrode material by adjusting the cobalt-iron ratio, the amount of trisodium citrate, additives, and calcination, thereby improving the specific capacitance, energy density, and cycle life of the supercapacitor.

This invention discloses a method for removing chromium-based coatings from the surface of cutting tools. The tool to be removed is contacted with an aqueous solution containing a stripping solution, and the reaction is carried out by heating. The stripping solution is an alkaline stripping solution containing potassium ferricyanide and an alkali, with a concentration of 140-160 g per liter of water. The reaction temperature is controlled between 40°C and 55°C, and a constant temperature water bath is used to maintain this temperature. Reaction temperature is a critical factor: below 40°C, the reaction rate decreases significantly; above 55°C, the metal protective agent in the stripping solution fails, leading to corrosion of the tool substrate. The stripping time is adjusted according to the coating thickness and temperature: the greater the thickness or the lower the temperature, the longer the time required; and vice versa. This invention has high stripping efficiency, effectively protects the substrate, and is suitable for various chromium-based coatings such as Cr, CrAl, CrN, and AlCrN on high-speed steel, cemented carbide, or powder metallurgy steel cutting tools.

This invention discloses an inverted TDN-modified electrode, a ratiometric electrochemical aptamer sensor for CRISPR / Cas12a-mediated DNA tetrahedral reporter probe interfacial cleavage, and their applications. The invention assembles a thiol-modified substrate chain onto three edges of a DNA tetrahedron, subsequently fixing it to the electrode surface via gold-sulfur bonds, achieving inverted fixation of the DNA tetrahedron. The steric hindrance of the DNA tetrahedron hinders electron transfer at the electrode interface by potassium ferricyanide, while the electroactive molecule methylene blue is embedded in the double-stranded backbone, thus achieving a dual-signal response. When the trans-cleavage activity of CRISPR / Cas12a is activated, the co-block nucleic acid substrate chain is cleaved, causing the DNA tetrahedral structure to dissociate from the electrode surface, resulting in a weakened MB signal. Simultaneously, the potassium ferricyanide signal is enhanced due to the recovery of interfacial electron transport efficiency, forming a ratiometric signal output. This invention effectively improves signal gain and detection accuracy.

The application discloses an electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a sulfate in deionized water, adding potassium citrate and potassium ferricyanide, and stirring to obtain a mixed solution; immersing a pretreated carbon cloth substrate in the mixed solution, standing, and then taking out the carbon cloth substrate to wash and dry, so that a Prussian blue analogue electrode material is obtained. The positive material Prussian blue analogue material is applied to the field of zinc negative electrodes, has stable structure, can store a certain amount of ions, can induce directional and uniform deposition of zinc metal, is suitable for electrochemical tests under large and small current densities, can improve the coulomb efficiency of a zinc ion battery, and has high reversibility and cycle performance.