摘要:
Disclosed is a transition metal precursor used for preparation of lithium composite transition metal oxide, the transition metal precursor comprising a composite transition metal compound represented by the following Formula 1: M(OH1−x)2−yAy/n (1) wherein M comprises two or more selected from the group consisting of Ni, Co, Mn, Al, Cu, Fe, Mg, B, Cr and second period transition metals; A comprises one or more anions except OH1−x; 0
摘要:
Disclosed herein are two-dimensional (2D) nanosheets comprising a continuous transition metal oxide phase permeated by a plurality of pores. The plurality of pores can have an average characteristic dimension of from 1 nm to 30 nm. Also disclosed herein are methods of making the 2D nanosheets described herein. The 2D nanosheets can be prepared by reacting a graphene template with a transition metal compound to form a nanosheet precursor and calcining the nanosheet precursor to form the 2D nanosheet. Methods of use of the 2D nanosheets, for example as electrodes in batteries, are also described.
摘要:
A method of synthesizing a metal oxide nanowire includes the steps of: combining an amount of a transition metal or a transition metal oxide with an amount of an alkali metal compound to produce a mixture; activating a plasma discharge reactor to create a plasma discharge; exposing the mixture to the plasma discharge for a first predetermined time period such that transition metal oxide nanowires are formed; contacting the transition metal oxide nanowires with an acid solution such that an alkali metal ion is exchanged for a hydrogen ion on each of the transition metal oxide nanowires; and exposing the transition metal oxide nanowires to the plasma discharge for a second predetermined time period to thermally anneal the transition metal oxide nanowires. Transition metal oxide nanowires produced using the synthesis methods described herein are also provided.
摘要:
A positive active material including a lithium composite oxide and a transition metal oxide including a transition metal having an oxidation number smaller than an oxidation number when the transition metal is in the most stable state hinders generation of oxygen occurring during charging and provides a lithium battery with high-temperature preservation characteristics and high stability.
摘要:
A porous metal-oxide composite particle suitable for use as a oxygen reduction reaction or oxygen evolution reaction catalyst and sacrificial support based methods for making the same.
摘要:
Provided is a method for synthesizing air electrode powder, which uses instead of an organic solvent lanthanum-nitrate, strontium-nitrate, cobalt-nitrate, and iron-nitrate, which are affordable and can undergo water-based synthesis, by controlling additional mol ratio and a synthesis temperature of a chelate agent and an esterification reaction accelerating agent instead of complex process controlling conditions, such as a hydrolysis condition and pH in order to control particle shape.
摘要:
A method for preparing crystalline cobalt nitrate. The method includes: 1) calcining a spent Co/SiO2 catalyst, cooling the calcined material to room temperature, and grinding it to yield a powder; 2) heating the powder in a fluidized bed reactor; 3) adding the heated powder into excess dilute nitric acid solution and filtering to obtain a cobalt nitrate solution; 4) adjusting the pH value of the cobalt nitrate solution to 1.5, adding a preheated oxalic acid solution, adjusting a pH value of the resulting solution to 1.5, immediately filtering the resulting solution to yield a precipitate of cobalt oxalate, washing the precipitate of cobalt oxalate to yield a neutral filtrate; 5) drying the precipitate and calcining to yield cobalt oxide; 6) dissolving the cobalt oxide in nitric acid to yield a second cobalt nitrate solution; and 7) evaporating the second cobalt nitrate solution to obtain crystalline cobalt nitrate.
摘要:
A process for preparing a mesoporous metal oxide, i.e., transition metal oxide, Lanthanide metal oxide, a post-transition metal oxide and metalloid oxide. The process comprises providing a micellar solution comprising a metal precursor, an interface modifier, a hydrotropic ion precursor, and a surfactant; and heating the micellar solution at a temperature and for a period of time sufficient to form the mesoporous metal oxide. A mesoporous metal oxide prepared by the above process. A method of controlling nano-sized wall crystallinity and mesoporosity in mesoporous metal oxides. The method comprises providing a micellar solution comprising a metal precursor, an interface modifier, a hydrotropic ion precursor, and a surfactant; and heating the micellar solution at a temperature and for a period of time sufficient to control nano-sized wall crystallinity and mesoporosity in the mesoporous metal oxides. Mesoporous metal oxides and a method of tuning structural properties of mesoporous metal oxides.
摘要:
Nanowire synthesis and one dimensional nanowire synthesis of titanates and cobaltates. Exemplary titanates and cobaltates that are fabricated and discussed include, without limitation, strontium titanate (SrTiO3), barium titanate (BaTiO3), lead titanate (PbTiO3), calcium cobaltate (Ca3Co4O9) and sodium cobaltate (NaCo2O4).
摘要翻译:纳米线合成和一维纳米线合成钛酸盐和钴酸盐。 制造和讨论的示例性钛酸盐和钴酸盐包括但不限于钛酸锶(SrTiO 3),钛酸钡(BaTiO 3),钛酸铅(PbTiO 3),钴酸钙(Ca 3 Co 4 O 9)和钴酸钠(NaCo 2 O 4)。
摘要:
Disclosed are methods for producing carbon, metal and/or metal oxide porous materials that have precisely controlled structures on the nanometer and micrometer scales. The methods involve the single or repeated infiltration of porous templates with metal salts at controlled temperatures, the controlled drying and decomposition of the metal salts under reducing conditions, and optionally the removal of the template. The carbon porous materials are involve the infiltration of a carbon precursor into a porous template, followed by polymerization and pyrolysis. These porous materials have utility in separations, catalysis, among others.