31results about How to "Fast reaction kinetics" patented technology

The invention provides a CoSX@MnO 2 Composite material and its preparation method and application, its preparation method comprises: (1) MnO 2 Preparation of nanotubes; (2) ZIF‑67@MnO 2 Preparation of composite materials; (3) CoS X @MnO 2 Preparation of Catalyst; CoS of the Invention X @MnO 2 The preparation process of the catalyst is simple and controllable, the preparation time is short, and the structure of the obtained catalyst is dendritic MnO 2 penetrating fruit-like CoS X , its structure is stable; in addition, the CoS prepared by the present invention X @MnO 2 During the electrocatalytic oxygen evolution reaction of the catalyst, 10mAcm ‑2 The overpotential at the current density is only 334mV, compared to commercial MnO 2 Catalyst 470mV overpotential drops 136mV; In addition, CoS X @MnO 2 The Tafel slope is 84.8mV dec ‑1 , compared to the commercial MnO 2 Tafel slope 140mV dec ‑1 have a smaller Tafel slope. These all indicate that CoS X Loaded on carrier ZIF‑67@MnO 2 on after exhibited better than commercial MnO 2 more excellent electrocatalytic performance.

A V-doped Ni coated with V-doped NiO 3 S 2 Preparation method of core-shell structure. Add vanadium chloride and urea into ultrapure water to obtain solution A; place solution A and nickel foam in the reaction liner and seal it, then put it into a homogeneous reactor for hydrothermal reaction, wash and dry to obtain in-situ growth in NiV‑LDH / NF on nickel foam; put the thioacetamide solution NiV‑LDH / NF in a hydrothermal kettle for hydrothermal reaction and cool to room temperature; place the reaction kettle at room temperature for 20‑24h and take out the nickel foam After washing and drying, V-doped Ni coated with V-doped NiO was obtained 3 S 2 Electrocatalytic materials with core-shell structure. In the present invention, nickel foam is used as nickel source, vanadium chloride and urea are respectively vanadium source and alkali source, and the NiV-LDH / NF precursor grown on the surface of foam nickel is obtained in situ, and the presence of vanadium ions accelerates the nickel ions in foam nickel The release of NiV-LDH also regulates the morphology of NiV-LDH, and the obtained in-situ NiV-LDH / NF structure is extremely stable. The prepared final core-shell composite material has excellent electrocatalytic oxygen evolution and hydrogen evolution performance and stability, as well as fast reaction kinetics.

The invention relates to the field of a fuel cell electrolyte and discloses a proton conductor material, a preparation method and application thereof, and an intermediate temperature fuel cell. The chemical formula of the proton conductor material is (NH4)2A1-xBxP4O13, wherein A is one, two or more than two elements of Y, Ti, Nb, Ta, Mo and W; B is one, two or more than two elements of Al, In, Si, Ge and Sn; and x is greater than or equal to 0 and less than or equal to 0.4. When the proton conductor material provided by the invention works in an intermediate temperature (150 to 400 DEG C) range, the proton conductivity is obviously higher than 4*10<-2>S / cm, and application of the proton conductor material to the intermediate temperature fuel cell can be realized.

The invention discloses a sulfur cathode material with a core-shell structure, a preparation method and an application in a lithium-sulfur battery. The core-shell structure nano cage adopts a one-step method to directly generate a metal coordination gel from a transition metal salt and an organic ligand as a skeleton After freeze-drying and high-temperature calcination, the coating material C@Fe 3 o 4 , in order to make the active material evenly distributed and give full play to the structural advantages, part of the Fe is etched by acid 3 o 4 Get the core-shell structure (YCF), using carbon shell and Fe 3 o 4 The gap between them encapsulates sulfur, resulting in S / YCF material. The synergistic effect of the carbon shell and the polar core as a physical barrier and a chemical adsorbent can effectively inhibit the shuttle effect of polysulfides, and by regulating Fe 3 o 4 The content of polar balls can balance the maximum sulfur loading, inhibit polysulfide shuttling and accommodate volume expansion, and realize the preparation of high Coulombic efficiency and long-life positive electrodes.

The invention discloses a novel tellurium-based electrode and an application thereof in a sodium-tellurium battery and a sodium-ion battery. The electrode material is selected from elemental tellurium and a tellurium-bearing composite material; the sodium-ion battery comprises a cathode, an anode and an electrolyte; and an anode active material is selected from a tellurium-based material. The sodium-ion battery disclosed by the invention has the characteristics of good safety, high specific capacity and cycling stability.

The present invention provides a fluorescent coded microsphere, an array and a preparation method, wherein the coded microsphere includes a microsphere carrier, the microsphere carrier is a mesoporous microsphere, and at least one kind of fluorescent light is arranged inside the microsphere carrier. Markers, the fluorescent markers are formed by connecting fluorescent dyes with intermediary substances, and the central emission wavelengths of the fluorescent dyes corresponding to each of the fluorescent markers are different, so that each fluorescent dye defines one of the encoded microspheres Encoding information for the dimension.