8 results about "Nickel compounds" patented technology

This invention relates to the field of conductive paste technology, and discloses a silver-coated nickel conductive paste for photovoltaic cells and its preparation method. The conductive paste comprises 65-85 parts of nickel-based alloy core@Ag composite powder, 15-30 parts of auxiliary silver powder, 2-4 parts of glass powder, 25-35 parts of organic carrier, and 0.2-0.8 parts of interface adaptant. The alloying element in the nickel-based alloy core is selected from one or more of P, B, and Si, with P content of 0.5%-5.0%, B content of 0.1%-2.0%, and Si content of 1.0%-4.0%. The interface adaptant is selected from organosilver or organonickel compounds. Alloying reduces the Ag / Ni interface energy to inhibit dewetting, and the interface adaptant is used to repair micro-defects in situ, improve the integrity of the silver shell, reduce contact resistance, and improve cell efficiency and reliability.

An electrode assembly, a secondary battery, and an electrical apparatus. The electrode assembly includes a positive electrode plate, a negative electrode plate and a separator. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer arranged on at least one side surface of the positive electrode current collector. The positive electrode film layer in the present application includes a nickel-containing compound and a binder. A molar percentage content of a nickel element in the nickel-containing compound based on a total molar amount of transition elements is Y, and a mass percentage content of the binder in the positive electrode film layer is X; and it is satisfied: Y / X<53.

This invention relates to the field of asymmetric catalytic hydrogenation, specifically to a method for preparing chiral chromone or chromane carboxylic acid compounds. The method involves preparing a chiral catalyst from a nickel compound and ligands. By controlling the combination of the nickel compound-ligand-solvent, enantioselective hydrogenation of the conjugated C=C bonds of the substrate chromone carboxylic acid compound is achieved, yielding the semi-reduced product chiral chromone carboxylic acid; or, further, the carbonyl group is reduced, and carbonyl reduction and dehydroxylation reactions are carried out at room temperature under trifluoroacetic acid and triethylsilane conditions to obtain the fully reduced product chiral chromane carboxylic acid. The catalytic system of this invention is simple to construct, and the selectivity can be controlled by the solvent system. It maintains high conversion and excellent enantioselectivity even under high S / C conditions, making it suitable for the efficient preparation of chiral chromone / chromane skeletal carboxylic acid compounds.

The application discloses high-purity sulfur-containing active nickel particles and a preparation method thereof. A nickel sulfur / nickel compound is added into a nickel melt, and refining is carried out under electromagnetic stirring to obtain a nickel sulfur melt. Then, the nickel sulfur melt is cast in a mold to obtain a high-purity nickel sulfur ingot. The ingot is subjected to hot isostatic pressing to obtain a compacted blank. The blank is cut according to the size of a finished product to obtain the high-purity sulfur-containing active nickel particles. The nickel sulfur / nickel compound is selected from one of a nickel block wrapped with a nickel sulfur compound, a nickel foil wrapped with a nickel sulfur compound and a nickel sintered body containing a nickel sulfur compound. The application adds sulfur into nickel by a specific method through vacuum induction smelting, and realizes preparation of a nickel sulfur ingot with high-purity composition, stable sulfur content and no segregation by combining with electromagnetic stirring in the whole process. Subsequently, a targeted processing technology is adopted according to the large brittleness of the nickel sulfur to complete batch production of the high-purity sulfur-containing active nickel particles. The preparation method is low in comprehensive cost, small in environmental pollution and suitable for industrialized production.

This invention discloses a method for preparing a nickel single-atom catalyst based on lignin-based activated carbon and its application in electrocatalytic CO2 reduction. The method uses lignin-based activated carbon as the carbon support, melamine as the nitrogen source, and a nickel-containing compound as the metal source. A process of doping followed by loading is employed to prepare the lignin-based activated carbon nickel single-atom catalyst. Application to electrocatalytic CO2 reduction revealed that, in H-type electrolytic cell tests, the catalyst exhibited high CO selectivity and CO bias current density across a wide potential range of -0.7 to -1.0 V vs RHE, demonstrating excellent catalytic activity. Compared to traditional catalysts, the carbon support used in this method is a renewable solid waste resource, resulting in low raw material costs and a simple and easy-to-operate preparation process. This method not only provides guidance for the application of lignin-based activated carbon in the field of electrocatalysis but also reduces the preparation cost of CO2 reduction electrocatalysts.

Provided in the present invention is a method for preparing a 2-alkoxy-2-methyl tetrahydrofuran compound from 2-methyl furan. In the present invention, a metal hydroxide and zero-valent nickel compounded catalyst is prepared, and a 2-alkoxy-2-methyltetrahydrofuran is generated by directly hydrogenating 2-methylfuran under the conditions of an alcohol solvent and hydrogen. By means of the method of the present invention, the use of a homogeneous acid catalyst is avoided, such that the product separation is more convenient, and the catalyst can be recycled, thereby also reducing the burden on the environment, providing a new technical solution for achieving efficient and green synthesis of a 2-alkoxy-2-methyltetrahydrofuran, and broadening the production of biomass-based fuels, chemicals and green solvents.