138 results about "Phosphide compound" patented technology

The invention provides a method for preparing ethylene glycol and 1,2-propylene glycol by using a high-concentration saccharide solution. Reaction raw materials comprise cane sugar, glucose, fructose, fructosan, xylose, soluble lower polyxylose and soluble starch. According to the method, high-concentration saccharide is used as a reaction raw material, and a high-pressure pump feeding mode is used in a reaction process which is performed in a high-pressure reaction kettle; iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium and platinum which serve as transition metal in eighth, ninth and tenth groups are used as hydrogenation active ingredients; the hydrogenation active ingredients form a composite catalyst together with metal tungsten, tungsten carbide, tungsten nitride, tungsten phosphide, tungsten oxide, tungsten sulfide, tungsten chloride, tungsten hydroxide, tungsten bronze, tungstic acid, tungstate, metatungstic acid, metatungstate, paratungstic acid, paratungstate, peroxotungstic acid, peroxotungstate and tungsten-containing heteropolyacid which serve as catalytic active ingredients; and the high-concentration saccharide solution can be efficiently prepared into the ethylene glycol and the propylene glycol at high selectivity and high yield in a one-step catalytic conversion process under the hydrothermal condition that the temperature is 120 to 300 DEG C and the hydrogen pressure is 1 to 13MPa. By the method, the problem of coking of the high-concentration saccharide in the catalytic conversion process can be effectively solved, and high-concentration ethylene glycol and propylene glycol can be prepared by the high-concentration saccharide.

A positive electrode material for a lithium sulphur battery and a preparation method thereof, and the lithium sulphur battery are disclosed. The positive electrode material comprises activated carbon,carbon black, transition metal or a transition metal compound, and sublimed sulfur; and the transition metal compound is metal carbide, metal boride, metal nitride, metal phosphide, metal oxide or metal sulfide. The activated carbon is utilized as a main body of sulfur carrying; the carbon black can carry sulfur and can also strengthen the conductivity of the positive electrode material; and thetransition metal or the transition metal compound can play a fixation role in lithium polysulfide produced in an electrochemical reaction, inhibits the shuttle effect of polysulfide ions, and enablesthe cycle performance of the lithium sulphur battery to be improved. The positive electrode material for the lithium sulphur battery disclosed by the invention has the advantages of being simple and easy to obtain, easy to be prepared on a large scale, and the like, and the lithium sulphur battery with long circulation, high specific capacity and high specific energy can be obtained.

The extraction efficiency of a light emitting device can be improved by making the absorbing device layers as thin as possible. The internal quantum efficiency decreases as the device layers become thinner. An optimal active layer thickness balances both effects. An AlGaInP LED includes a substrate and device layers including an AlGaInP lower confining layer of a first conductivity type, an AlGaInP active region of a second conductivity type, and an AlGaInP upper confining layer of a second conductivity type. The absorbance of the active region is at least one fifth of the total absorbance in the light-emitting device. The device optionally includes at least one set-back layers of AlGaInP interposing one of confining layer and active region. The p-type upper confining layer may be doped with oxygen improve the reliability.

Novel cyclic amides containing tin or lead are disclosed. These cyclic amides can be used for atomic layer deposition or chemical vapor deposition of tin or lead as well as their oxides, sulfides, selenides, nitrides, phosphides, carbides, silicides or borides or other compounds. Tin(IV) oxide, SnO2, films were deposited by reaction of a cyclic tin amide vapor and H2O2 or NO2 as oxygen sources. The films have high purity, smoothness, transparency, electrical conductivity, density, and uniform thickness even inside very narrow holes or trenches. Deposition temperatures are low enough for thermally sensitive substrates such as plastics. Suitable applications of these films include displays, light-emitting diodes, solar cells and gas sensors. Doping SnO2 with aluminum was used to reduce its conductivity, making material suitable as the active semiconductor layer in electron multipliers or transparent transistors. Deposition using the same tin precursor and H2S deposited tin monosulfide, SnS, a material suitable for solar cells.

The invention discloses a preparation method of a FeNiP / C@ MXene composite negative electrode material for a lithium ion battery. The method comprises the following steps: dissolving nickel acetylacetonate and ammonium ferrous sulfate in ethanol, adding the solution into a solution of N, N-dimethylformamide dissolved with a surfactant and an organic ligand, strongly and magnetically stirring, and transferring the solution into a high-pressure reaction kettle for reacting; carrying out centrifugal separation and vacuum drying to obtain a mixed metal organic framework template; mixing and stirring a template and a pretreated MXene material, and centrifuging to obtain a Fe / Ni-MOF@ MXene precursor; and phosphating and calcining the precursor in a protective atmosphere to obtain the FeNiP / C@ MXene composite material. According to the invention, phosphide is crystallized and nucleated in MOF, the hollow carbon shell provides a sufficient space for the volume change of the internal phosphide, and the MXene at the outermost layer can limit the side reaction of the electrolyte and the phosphide so that initial coulombic efficiency is improved.

The invention discloses an immersion type phosphide synthesis and growth device under a magnetic field, belongs to the field of semiconductor material preparation, and particularly relates to a device for synthesizing and growing a semiconductor phosphide in a mode of immersing phosphorus into a metal melt under the action of a static magnetic field. The device comprises a main furnace body, a crucible in the main furnace body, a heater on the periphery of the crucible and a heat preservation layer, and further comprises an injection synthesis system connected with a driving device, wherein the injection synthesis system bears red phosphorus and sinks into the crucible under the action of a driving device. According to the invention, By adopting the device provided by the invention, red phosphorus sinks into a melt in a solid form and floats upwards from the bottom of a crucible after being gasified, so that the problems of suck-back and the like caused by phosphorus bubbles are solved; and a transverse static magnetic field inhibits the floating speed of bubbles and also inhibits melt convection in the temperature gradient direction, so that the synthesis process is more stable and rapid.

The invention belongs to the technical field of electrocatalysis, and discloses a synthesis method of a hollow oxide / phosphide carbon-coated composite material for electrocatalytic hydrogen production. The synthesis method mainly comprises the following steps: synthesizing nano silicon dioxide particles; synthesizing hollow nano cerium dioxide; synthesizing H-CeO2 / Ni@NC; and synthesizing a targetproduct H-CeO2 / Ni@NC. According to the invention, a transition metal oxide is used for regulating and controlling transition metals, so that rapid water molecule dissociation and hydrogen removal reaction are realized, and efficient catalytic hydrolysis hydrogen production reaction is realized. The hollow cerium dioxide nanospheres are composed of octahedral sub-nano cerium dioxide particles, so that the hollow cerium dioxide nanospheres have the porous characteristic, and electrolyte and gas transmission is faster; the hollow structure can expose a larger specific surface area, so that the utilization rate of active sites is improved.