9 results about "Cobalt atom" patented technology

The invention discloses a C3N4-based diatomic cobalt catalyst and a preparation method and application thereof, and the catalyst is uniformly dispersed on the surface of a C3N4 carrier in the form of cobalt atom pairs to form a diatomic active center with clear Co-Co coordination. The preparation method comprises the following steps: reacting cobalt salt with 2, 2 '-bipyridine and oxalic acid to generate a cobalt dimer complex, mixing the cobalt dimer complex with a C3N4 dispersion liquid, stirring, evaporating, and calcining in an air atmosphere to obtain a final product. Adjacent cobalt atoms are accurately anchored through a nitrogen coordination environment of C3N4, and diatomic sites with stable structures and electron coordination are constructed on the atomic scale. Structural characterization results prove that cobalt atoms are dispersed in a diatomic form and do not agglomerate. The catalyst shows excellent performance in electrocatalytic oxygen reduction reaction, the current density and H2O2 yield of the catalyst are obviously higher than those of monatomic cobalt and cobalt nanoparticle contrast samples, and the catalyst shows high activity, high selectivity and good structural stability.

Methods for forming a connection structure, including: Forming a recess (108) within a dielectric layer (106); shape-adapted deposition of a barrier layer (110) within the recess; Forming a ruthenium lining with cobalt infusion over the barrier layer, the cobalt-containing ruthenium lining comprising: a first lining (120) directly above the barrier layer, wherein the first lining comprises ruthenium; a second lining (130) directly above the first lining, the second lining comprising cobalt; and a third lining (240) directly above the second lining, wherein the third lining contains ruthenium, wherein the ruthenium lining with cobalt infusion is formed by migration of cobalt atoms from the second lining into the first and the third lining; Deposition of a conductive material (242) over the ruthenium lining with cobalt infusion to fill the recess; and Forming a cover layer (256) over an upper surface of the conductive material, wherein the cover layer comprises cobalt.

The application belongs to the technical field of catalytic materials, and discloses a preparation method and application of a double cobalt atom catalyst. The target catalyst Co2-DAC is prepared through the steps of mixed liquid preparation, preheating dropwise adding, constant temperature refluxing and post-treatment purifying, and the reaction condition is mild, inert gas protection is not needed, the process is simple, and the cost is relatively low. The prepared catalyst takes double cobalt atoms as the active center, the atoms are uniformly dispersed, and the structure is stable. With the synergistic effect of the double active sites, the charge transport and CO2 activation performance can be improved, the catalyst shows high activity and stability in the photocatalytic CO2 reduction reaction, can effectively convert CO2 into high value-added products, and provides guidance for designing double atom catalysts with high photocatalytic CO2 reduction activity.

Provided is a cemented carbide comprising a plurality of tungsten carbide particles and a binder phase, the cemented carbide containing the tungsten carbide particles and the binder phase in a total amount of 89-100 vol%, and the binder phase in an amount of 0.5-25 vol%, wherein: the binder phase contains cobalt in an amount of 40 mass% or greater, and further contains at least one first element selected from the group consisting of silicon, phosphorus, germanium, tin, rhenium, ruthenium, osmium, iridium, and platinum; and in a rectangular measurement region, which is provided in a TEM-HAADF image obtained by observing a (110) plane of the cobalt having an fcc structure by a magnification of 5 million times using an atomic resolution transmission electron microscope, and in which 31 cobalt atoms are contained in a first direction and 5 to 10 cobalt atoms are contained in a second direction orthogonal to the first direction, a frequency of mismatch of an atomic array of the cobalt atoms is from 8% to 30.0%.

A cemented carbide including tungsten carbide particles and a binder phase, in which the cemented carbide includes 89 vol % to 100 vol % of the tungsten carbide particles and the binder phase in total, the cemented carbide includes 0.5 vol % to 25 vol % of the binder phase; the binder phase includes 40 mass % or more of cobalt, the binder phase further includes at least one first element selected from the group consisting of silicon, phosphorus, germanium, tin, rhenium, ruthenium, osmium, iridium, and platinum, and a frequency of inconsistency in atomic arrangements of cobalt atoms in a rectangular measurement region provided in a TEM-HAADF image obtained by observing a (110) plane of the cobalt having an fcc structure using an atomic resolution transmission electron microscope, in which the rectangular measurement region contains 31 cobalt atoms in a first direction and 5 to 10 cobalt atoms in a second direction, is 8% or more and 30.0% or less.

A cubic boron nitride sintered material includes: 70 volume % or more and 99 volume % or less of a cubic boron nitride grains; and a binder, wherein the binder includes a first compound including chromium, cobalt and carbon, tungsten carbide, cobalt, and aluminum, and in the first compound, a ratio NCr / (NCr+NCo) of the number NCr of atoms of the chromium to a sum of the number NCr of the atoms of the chromium and the number NCo of atoms of the cobalt is 0.10 or more and 0.90 or less.

Provided is a cubic boron nitride sintered compact comprising cubic boron nitride particles in the amount of 70-99 vol%, and a binder. The binder comprises: a first compound containing chromium, cobalt, and carbon; tungsten carbide; cobalt; and aluminum. In the first compound, the ratio NCr / (NCr+NCo) of the number of chromium atoms NCr to the total of the number of chromium atoms NCr and the number of cobalt atoms NCo is 0.10-0.90.

To provide a positive electrode active material for a secondary battery having high capacity and excellent charge / discharge cycle characteristics.SOLUTION: A positive electrode active material includes an aggregate of particles including a first particle group and a second particle group, the aggregate of particles contains lithium, cobalt, nickel, aluminum, magnesium, oxygen, and fluorine, when the number of atoms of cobalt contained in the aggregate of particles is 100, the number of atoms of nickel is 0.05 or more and 2 or less, the number of atoms of aluminum is 0.05 or more and 2 or less, and the number of atoms of magnesium is 0.1 or more and 6 or less, and when the aggregate of particles is subjected to particle size distribution measurement by a laser diffraction / scattering method, the first particle group has a first peak. The second particle group has a second peak, the first peak has a maximum value in a range of 2 μm or more and 4 μm or less, and the second peak has a maximum value in a range of 9 μm or more and 25 μm or less.SELECTED DRAWING: Figure 26

The application discloses a preparation method of dicarbonyl cyclopentadienyl cobalt, which uses octacarbonyldicobalt, elemental iodine and cyclopentadienyl alkali metal salt as core reaction raw materials to prepare the dicarbonyl cyclopentadienyl cobalt. By introducing the elemental iodine and adopting the feeding sequence of first adding the cyclopentadienyl alkali metal salt and then adding the elemental iodine, the target product can be prepared under the conditions of low-temperature feeding and room-temperature reaction. The method not only avoids directly using the chemically active cyclopentadiene monomer, but also significantly reduces or avoids the generation of a cobalt-containing byproduct, reduces the diversion of part of the cobalt raw material to the byproduct side, improves the cobalt atom utilization rate and process repeatability, and is more convenient for post-processing, so that the target product with high purity can be obtained.