9results about How to "High redox activity" patented technology

The invention discloses a method for preparing a flexible self-supporting MXene / graphene / carbon nanotube thin film electrode material, which comprises the following steps: ultrasonically dispersing exfoliated graphene in deionized water, centrifuging to form a graphene dispersion; adding functionalized carbon nanotubes to a polydiallyldimethylammonium chloride solution, ultrasonically dispersing, centrifuging and washing to obtain carbon nanotubes modified with polydiallyldimethylammonium chloride; mixing the MXene dispersion and the graphene dispersion, adding carbon nanotubes modified with polydiallyldimethylammonium chloride, ultrasonically crushing, stirring, vacuum filtering to form a film, freeze drying, and annealing. The introduction of graphene and carbon nanotubes suppresses the problem of easy stacking of MXene, increases active sites, promotes the diffusion of electrolyte ions, and improves electrochemical performance.

In order to overcome the defects in the prior art, the invention provides a preparation method of a redox electrode for an all-iron flow battery, and the preparation method comprises the following steps: step 1, pretreating a carbon electrode to obtain a pretreated carbon electrode; step 2, preparing a metal-carbon load; step 3, dissolving the metal-carbon load in a solvent to obtain a treatment solution; 4, immersing the pretreated carbon electrode in the treating fluid, and controlling the loading capacity of the metal-carbon load on the carbon electrode to be 3mg / cm < 2 >; and step 5, taking out the carbon electrode loaded with the metal-carbon load, and drying to obtain the redox electrode for the total iron flow battery. According to the redox electrode for the total iron flow battery, the metal-carbon material serves as an electrode load, more reaction sites can be provided for the electrode, the prepared electrode is high in catalytic activity, and the redox activity of the electrode is remarkably improved.

The invention discloses a mesoporous electro-adsorption defluorination positive electrode material rich in defects after vulcanization reconstruction, which is prepared by the following steps: preparing a bismuth-doped and defect-rich mesoporous carbon material, including ultrasonic vibration stirring, hydrothermal treatment in an organic environment, nitrogen atmosphere annealing and secondary hydrothermal treatment in which sulfur participates; the electro-adsorption positive electrode material belongs to a sulfur-modified bismuth-containing mesoporous synergistic platform embedded in a carbon shell, and has the defects of a nano frame with strong pore accessibility and high density; the synergistic process comprises double-electric-layer capacitive adsorption and reversible oxidation-reduction conversion. The nanometer configuration reduces the dependence on slow diffusion, reduces the activation energy barrier, and shows high redox activity. The electrode prepared by the method has a unique mesoporous framework, a large number of defluorination sites are obtained on the surface of the electrode, a rapid ion storage behavior mainly based on a capacitance control process is realized on a solid-liquid interface, fluorine-containing substances in water can be effectively separated in an electro-adsorption system, and the method is a pollution control process with a clear mechanism.

The invention discloses a polyacrylonitrile-coated copper-doped manganese-based Prussian blue positive electrode material as well as a preparation method and application thereof, and belongs to the field of sodium ion batteries. The synthesis method is novel in preparation method, simple and feasible in process and high in controllability. By doping copper ions, the structural stability of the manganese-based Prussian blue is improved, and the redox activation of low-spin Fe < 2 + > / Fe < 3 + > coupling is improved, so that higher capacity contribution under higher voltage is obtained; polyacrylonitrile is used as a coating layer, so that the problem that the content of internal crystal water and Fe (CN) 6 defect vacancies is relatively high due to the fact that the positive electrode material is eroded by external substances such as oxygen and water vapor can be prevented; in addition, by adopting the radio frequency heating technology, high-quality Prussian blue crystals can be formed, and the electrochemical performance of the material can be improved. The positive electrode material has outstanding performance in the application of the positive electrode of the sodium-ion battery.

This invention discloses a parallel-interface engineered viologen-based defective carbon nitride composite material, its preparation method, and its applications, belonging to the field of energy catalysis and photochemical materials technology. The material comprises: a defective graphitic carbon nitride support; single-atom platinum catalytic sites supported on the support; and a selenium-containing viologen compound anchored by covalent bonds in a configuration parallel to the support surface. Through a bilateral covalent bonding strategy, viologen molecules are stably anchored in a parallel configuration to the single-atom platinum-modified defective carbon nitride surface, constructing a highly efficient and stable "electron bridge" structure, significantly enhancing interfacial bonding and photogenerated electron transport efficiency. This composite material exhibits excellent photocatalytic hydrogen evolution activity and efficient coupling ability with benzylamine oxidation under visible light, and its activity retention rate reaches over 92% after 144 hours of cycling. It provides a new paradigm for solving the problem of poor interfacial stability in photocatalysts and has significant application prospects in the field of solar fuel synthesis.

The invention relates to the technical field of electrocatalysts for synthesizing ammonia by electrocatalytic nitrate reduction, and discloses a nano-porous CoFeS2 / Fe0. 95S1.05 composite electrocatalyst as well as a preparation method and application of the nano-porous CoFeS2 / Fe0. 95S1.05 composite electrocatalyst. The preparation method of the nano-porous CoFeS2 / Fe0. 95S1.05 composite electrocatalyst comprises the following steps: taking DMF (Dimethyl Formamide), absolute ethyl alcohol and deionized water as a mixed solvent, adding a cobalt salt, an iron salt and an organic ligand, stirring to fully dissolve to obtain a mixed solution, carrying out solvothermal reaction on the mixed solution to obtain an MOF-74 precursor, carrying out one-step vulcanization on the MOF-74 precursor, and drying to obtain the nano-porous CoFeS2 / Fe0. 95S1.05 composite electrocatalyst. And the nano-porous CoFeS2 / Fe0. 95S1.05 composite electrocatalyst is obtained. The nano-porous CoFeS2 / Fe0. 95S1.05 composite electrocatalyst is used as an NRA cathode material, high oxidation-reduction activity, effective synergistic effect and excellent conductivity of bimetallic sulfide are fully utilized, rapid electron transfer capability is provided for electrocatalytic reduction reaction, high ammonia yield and high FE are realized, and cycle stability of the catalyst is improved.

The invention provides a direct drinking water preparation method and device, and the method comprises the following steps: S1, carrying out activation treatment on raw water for 10-30 seconds through multi-frequency electromagnetic waves of 20-30 Hz, 30-45 Hz and 45-60 Hz respectively to improve the water molecular structure and improve the fluidity and activity of water; s2, pre-filtering the activated water by using quartz sand, cocoanut active charcoal and a softener to remove impurities and hardness ions; s3, performing membrane separation through reverse osmosis, and further purifying water; s4, performing precise filtration by using a nano-filtration membrane with a certain pore size; s5, mineralizing water by adopting a mineralization particle mixture consisting of medical stone, ginger stone and active calcium carbonate, and supplementing trace elements required by a human body; and S6, disinfecting by utilizing ozone and ultraviolet rays. The device comprises an energy activating device, a filtering device, a mineralizing device and a sterilizing device, and efficient, energy-saving and environment-friendly direct drinking water preparation is achieved through cooperation of multi-frequency electromagnetic wave activation and subsequent processes.

The invention discloses a Mo-assisted co-doped disordered rock salt Li1. 3Mn0. 4Nb0. 3O2 lithium-rich positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: taking metal oxides such as Li2CO3, Mn2O3, Nb2O5, MoO2, SnO2 and Fe2O3 as precursors, weighing according to a specific stoichiometric ratio, and additionally adding about 10% of Li2CO3 to compensate for Li loss; the preparation method comprises the following steps: fully mixing, carrying out high-energy ball milling in an argon atmosphere, tabletting, heating to 1000 DEG C at a speed of 5 DEG C / min in the argon atmosphere in a tubular furnace, calcining for a certain time at a constant temperature, naturally cooling, and rapidly transferring to a glove box. The positive electrode material is used for the lithium ion battery, the charge-discharge specific capacity and the energy density of the lithium ion battery can be improved, the preparation process is simple, the cost is low, and large-scale production is easy.

This invention belongs to the field of new energy storage technology and discloses a method for preparing and applying anionic medium-entropy MXene electrode material. The chemical formula of the anionic medium-entropy MXene material is M. n+ 1X n T x The X site contains four anions: carbon, nitrogen, oxygen, and fluorine, forming a medium-entropy composition. The preparation method includes: mixing TiC, Ti, Al, TiN, Al2O3, and AlF3 in a specific molar ratio, and sintering at high temperature under an inert atmosphere to obtain the anionic medium-entropy MAX phase; then removing the Al layer by etching, followed by intercalation, ultrasonic exfoliation, and drying to obtain few-layer anionic medium-entropy MXene nanosheets. This invention achieves a medium-entropy effect by having multiple anions co-occupy the X site, and for the first time, by introducing highly electronegative fluorine (F) anions to co-occupy the X site with carbon, nitrogen, and oxygen, thus significantly regulating the interlayer dynamic hydrogen bond network and redox activity. In particular, the strong electron-withdrawing ability of F and its unique interaction with hydrogen bonds effectively suppress side reactions and stabilize the interlayer structure, resulting in high volumetric capacity, excellent rate performance, and long-term cycling stability.