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3 results about "Squaric acid" patented technology
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Squaric acid, also called quadratic acid because its four carbon atoms approximately form a square, is a dibasic organic acid with the chemical formula C₄H₂O₄. The conjugate base of squaric acid is the hydrogensquarate anion C₄HO⁻₄; and the conjugate base of the hydrogensquarate anion is the divalent squarate anion C₄O²⁻₄. This is one of the oxocarbon anions, which consist only of carbon and oxygen.
Preparation method of sodium iron phosphate pyrophosphate positive electrode material, positive electrode material and electrochemical device
The application provides a preparation method of a sodium iron phosphate pyrophosphate positive electrode material, a positive electrode material and an electrochemical device. The preparation method comprises the following steps: mixing a sodium source, an iron source, a phosphorus source and a first carbon source, performing one-time grinding and drying, and then performing one-time sintering to obtain a sodium iron phosphate pyrophosphate precursor; dispersing the sodium iron phosphate pyrophosphate precursor, the first carbon source and an organic acid in a solvent, performing two-time grinding, and then drying to obtain a powder, wherein the organic acid comprises at least one of glyoxylic acid, phthalic acid, maleic acid, malic acid, oxalic acid, citric acid, acetic acid, squaric acid and tartaric acid; and performing two-time sintering on the powder to obtain the sodium iron phosphate pyrophosphate positive electrode material. The sodium iron phosphate pyrophosphate positive electrode material prepared by the preparation method has the advantages of low surface residual alkali content, good air stability and excellent electrochemical performance.
Owner:NANTONG RESHINE NEW MATERIAL TECHNOLOGY CO LTD
A transition metal selenide catalyst based on cobalt squarate-based MOF and a preparation method thereof
ActiveCN117643920BOrganic-compounds/hydrides/coordination-complexes catalystsCatalyst activation/preparationPtru catalystPhysical chemistry
The application discloses a preparation method of a transition metal selenide catalyst based on a Co-based MOF of a square acid. The Co-based MOF of the square acid is a dice-shaped square Co nanocage, and the Co-based MOF of the square acid is stable in thermodynamic properties and chemical properties. Then, the transition metal selenide catalyst is prepared by using selenium (Se) powder as a Se source and through an anion exchange method. The prepared transition metal selenide (CoSe2) has a large interface contact area, which is beneficial to exposing more surface active sites and improving catalytic activity.
Owner:HANGZHOU DIANZI UNIV