3results about How to "Optimize electronic structure" patented technology

The application provides a self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst and a preparation method thereof, and belongs to the technical field of catalytic material preparation. The Ni, Fe and Mn metal raw materials are repeatedly smelted, and after smelting, suction casting is carried out to obtain a cast plate. The cast plate is subjected to homogenization treatment, and then is cut and polished. Finally, etching is carried out in a nitric acid solution to obtain the self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst. The self-supporting electrocatalyst is prepared by the method of arc smelting, heat treatment and chemical etching, and has the advantages of simple preparation process, easy industrialization, adjustable size, excellent stability and excellent OER performance.

A heterovalent copper-doped lithium cobalt phosphate cathode material and its preparation method are disclosed, belonging to the technical field of lithium-ion battery cathode materials. The general chemical formula of the heterovalent copper-doped lithium cobalt phosphate cathode material is LiCu. x Co 1‑x PO4, where 0 < x ≤ 0.1; it has an orthorhombic Pnma olivine structure, Co 2+ The cobalt phosphate material occupies the 4c ​​site of the CoO6 octahedron; copper is doped into the lattice as monovalent copper, and heterovalent cobalt sites are substituted. The method is as follows: First, lithium, copper, cobalt, and phosphorus sources are mixed uniformly to obtain a precursor mixture; second, the precursor mixture undergoes a high-temperature solid-state reaction under a protective atmosphere, followed by calcination at 600-800℃ for 4-8 hours; finally, it is cooled to room temperature to obtain the cathode material. This invention successfully activates the electrochemical activity of lithium cobalt phosphate, significantly improving the initial charge-discharge capacity compared to the pure phase; the heterovalent substitution-induced cobalt valence state change helps optimize the electronic structure of the material and improve conductivity; the preparation process helps reduce side reactions and impurity phase formation, is simple, has good reproducibility, and is easy to scale up industrially.

This invention discloses a method for preparing a BiOI-based catalyst, the BiOI-based catalyst itself, and its applications, belonging to the field of carbon dioxide conversion and utilization. It overcomes the problems of insufficient stability and low product yield when BiOI is used as an ECR catalyst in existing technologies. The preparation method of the BiOI-based catalyst of this invention includes the following steps: Step 1, obtaining BiOI; Step 2, mixing the BiOI, a sulfur source, and a first solvent, heating and reacting to obtain S-BiOI powder; the mass ratio of BiOI to the sulfur source is 35.2:(0.25-4). The BiOI-based catalyst of this invention exhibits improved product yield and good stability during the reduction of carbon dioxide to formate or formic acid, maintaining high activity during long-term ECR formic acid production.