4results about How to "High cycle durability" patented technology

This application provides a high-hydrogen-storage-capacity AB2-type hydrogen storage alloy that can be activated at room temperature, its preparation method, and its application. The chemical composition of the AB2-type hydrogen storage alloy is Ti. a Zr 1‑a Mn b Cr c Fe d RE f Wherein, 0.70≤a≤0.90, 0.7≤b≤1.3, 0.7≤c≤1.0, 0<d≤0.3, 1.7≤b+c+d<2.0, 0<f≤0.3; RE represents a combination of two or more rare earth elements. This application, through the synergistic addition of at least two rare earth elements and precise control of the content of each element in the alloy, achieves high hydrogen storage capacity while realizing rapid activation at room temperature, exhibiting moderate hydrogen absorption / desorption plateau pressure and excellent cycle stability. The preparation method provided in this application is simple and easy to industrialize. The hydrogen storage alloy provided in this application can be widely used in hydrogen energy storage, transportation, and utilization, and has broad market application prospects.

The application discloses a method for preparing a Ti / Ni-based catalyst by electrochemical dealloying and application thereof, and belongs to the technical field of magnesium-based hydrogen storage materials. In view of problems of insufficient active sites, single valence and poor dispersity of the existing Ti / Ni-based catalyst, the Ti-Ni alloy is modified by using an electrochemical dealloying process, a dilute hydrochloric acid is used as an electrolyte, a Ti-Ni alloy sheet is used as an anode, and a graphite sheet is used as a cathode to construct an electrolytic cell, power electrolysis is performed until the alloy sheet is completely pulverized, and after centrifugal washing and drying, the Ti / Ni-based catalyst is obtained. The Ti / Ni-based catalyst is compounded with a magnesium-based hydrogen storage material by a mechanical ball milling method, the obtained composite hydrogen storage material exhibits excellent low-temperature hydrogen storage capacity, efficient hydrogen absorption and desorption kinetic performance and good cycle stability, and effectively solves the technical bottleneck of a traditional MgH2 system. The preparation method is simple in operation, controllable in cost and scalable, is suitable for practical application scenes such as vehicle-mounted hydrogen storage, and provides key support for commercialization of the magnesium-based hydrogen storage material.

This invention relates to carbonaceous materials, where the micropore volume is determined to be 0.05 cm³ using a grand canonical ensemble Monte Carlo simulation of the adsorption-desorption isotherms of carbon dioxide. 3 / g or more and 0.20cm 3 For g and below, in the aforementioned adsorption-desorption isotherms, the ratio of desorption to adsorption (desorption / adsorption) at a relative pressure of 0.01 is 1.05 or higher.

The application discloses a kind of foamed nickel load (NiO) 0.75 (MnO) 0.25 Porous nanosheet solid solution electrode material and its preparation method and application relate to material science and nanotechnology and new energy field, in-situ diffusion and lattice reconstruction of NiO / Mn3O4 heterojunction obtained by microwave-assisted hydrothermal in the process of medium-high temperature heat treatment under certain conditions can induce conversion from uniform arrangement and mutual connection two-dimensional nanosheet array structure to (NiO) 0.75 (MnO) 0.25 Porous nanosheet solid solution effectively increases electrochemical accessible surface area and accelerates charge transfer kinetics, thereby exhibiting high specific capacity, wide voltage window and excellent cycle durability in alkaline aqueous supercapacitors. The method is simple, reproducible, and suitable for large-scale production of high-performance alkaline aqueous supercapacitor electrode materials.