7results about How to "Improve hydrogen storage performance" patented technology

The invention relates to a magnesium-based hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage alloy materials and preparation thereof. The hydrogen storage material is an Mg-5Ni alloy with Sm powder uniformly distributed on the surface layer and an amorphous / nanocrystalline structure in the interior. The Sm powder is wrapped by the surface layer of the Mg-5Ni alloy to form composite powder of a core-shell structure; the hydrogen storage material is prepared from Mg-5Ni alloy powder and Sm powder as raw materials, and the raw materials are mixed and then subjected to dry ball milling. The hydrogen absorption and desorption kinetics of the existing magnesium-based hydrogen storage material can be effectively improved, the hydrogen desorption activation energy of the magnesium-based hydrogen storage material is reduced, and the problem that a solid additive is difficult to uniformly distribute on the surface is solved.

The application discloses a kind of catalysts for hydrogen storage material and its preparation method and application, belong to hydrogen storage material and its preparation technical field.The present application is to solve the problems such as high dehydrogenation temperature of existing magnesium-based solid hydrogen storage material and slow low-temperature kinetics.The present application is prepared by using nickel chloride hexahydrate, acetylacetone manganese, polyether P123, polyether P127, dopamine hydrochloride, 1,3,5-trimethylbenzene and ammonia as raw materials to obtain carbon as carrier wrapped with elemental Ni nanoparticle catalyst with a large number of edge dislocations, and is applied to Mg-based hydrogen storage material by ball milling method.The introduced dislocation has a dual role: not only directly accelerates the dissociation of H2 molecule, but also indirectly improves the activity of catalytic phase (Mg2NiH4 / Mg2Ni).The preparation process of the composite hydrogen storage material provided by the present application is simple and mature, and the raw materials are cheap and easy to obtain, only a small amount of MNC needs to be added to greatly improve the hydrogen storage performance of Mg, and it is convenient for large-scale industrial production.

The application provides a method for improving hydrogen adsorption performance of a covalent organic framework material, comprising the following steps: providing a covalent organic framework material containing an imine bond, and placing the covalent organic framework material in hydrochloric acid vapor for protonation treatment; the application also provides a protonated covalent organic framework material and a use of the protonated covalent organic framework material as a hydrogen storage medium.

The application relates to a Nb4N5-MgH2 composite hydrogen storage material and a preparation method thereof. The composite hydrogen storage material comprises Nb4N5 and MgH2, and the Nb4N5 accounts for 3wt.%-9wt.% in the composite hydrogen storage material according to the mass percentage. The preparation method comprises the following steps: (1) preparing a Nb4N5 catalyst, dissolving NbCl5 in anhydrous ethanol, adding ammonia water to generate a precipitate, washing and drying, and then calcining in an ammonia atmosphere to obtain a Nb4N5 catalyst powder; (2) mixing the Nb4N5 catalyst with MgH2, and preparing a composite hydrogen storage material through mechanical ball milling. In the ball milling process, stainless steel balls are adopted, argon is used as a protective atmosphere, the ball-to-material ratio is (10-40):1, the ball milling time is 5-12 hours, the rotating speed is 350-500 rpm, and positive and negative intermittent ball milling is adopted. The composite material prepared by the application has excellent hydrogen storage kinetic performance. Through the uniform distribution of the Nb4N5 catalyst and the stable phase structure thereof, the hydrogen absorption and release performance and the cycle stability of the hydrogen storage material are remarkably improved. The application is suitable for the hydrogen energy field.

This invention discloses a method for preparing MOF hydrogen storage materials from waste PET and its application. The chemical formula of the MOF material is M₁. X M₂ᵧ(BDC)₂(H₂O)₂, where M₁ is Zn²⁺ or Cu²⁺, M₂ is Co²⁺, Ni²⁺ or Mg²⁺, BDC is terephthalate, 0.1≤x≤0.9, 0.1≤y≤0.9, and x+y=1. The preparation method employs a microwave-assisted solvothermal method, and the terephthalic acid (TPA) is derived from the chemical depolymerization product of waste polyethylene terephthalate. This invention is the first to specifically apply waste PET-derived MOF materials to the field of hydrogen storage. By precisely controlling the ratio of metal salt to organic ligand, reaction temperature, and time, MOF materials with high specific surface area, regular pore structure, and a large number of open metal sites are prepared in a short time. This invention also provides the application of the MOF material in hydrogen storage. The material exhibits a hydrogen storage capacity exceeding 6.5 wt% at 77 K and 100 bar, and exceeding 2.3 wt% at 298 K and 100 bar, while also demonstrating excellent cycle stability. This method offers advantages such as short reaction time, low energy consumption, and good product crystallinity, making it suitable for large-scale production.

The utility model discloses a filling system based on cold energy recovery, including ammonia filling unit and hydrogen storage unit, ammonia filling unit includes reheater, and the liquid ammonia feed pipe and hydrogen storage device that communicate therewith, reheater medium end intercommunication circulating water pipe and backwater pipe no.

This invention discloses a Y-Sm-Mg-Ni hydrogen storage alloy electrode material and its preparation method. The chemical formula of the electrode material is Y 1‑a‑b Sm a Mg b Ni x Al y Where a, b, x, and y are atomic ratios, with 0.05 ≤ a ≤ 0.15, 0 ≤ b ≤ 0.2, 2.85 ≤ x ≤ 3.05, and 0 ≤ y ≤ 0.2. The preparation method involves using elemental metals, Y-Ni, and Mg-Ni master alloys as raw materials, and preparing the as-cast alloy using conventional induction melting. The as-cast alloy is then encased and sealed in a quartz tube under argon pressure of -0.09 to -0.05 MPa using tantalum sheets, and subsequently annealed in a muffle furnace. This invention significantly improves the cycle stability of Y-Mg-Ni alloys through Sm doping, and the preparation method reduces the preparation cost of Y-Sm-Mg-Ni alloys by using Y-Ni and Mg-Ni master alloys as raw materials.