Mechanical Composition Control for Ti-Based Hydrogen Storage Alloys

Abstract

Hydrogen absorbing alloys have attracted great attention because they are a safe and efficient media for transporting hydrogen energy. AB, AB2, AB5, and A2B-type hydrogen storage compounds and related substituted multi-component alloys have been proposed. In general, titanium-based alloys are among the most promising materials for hydrogen storage. Among the various available types of metal hydrides, AB2 type Ti-Cr-based alloys are the most promising candidates. In particular, there have been many methods for improving the hydrogen sorption properties. One of them is to prepare hydrogen absorbing alloys by mechanical alloying (MA). MA also enables synthesizing various non-equilibrium alloys and has been widely applied to modify properties of hydrogen storage alloys. Thus, MA is possibly the best way for mechanical composition control and mass production of various hydrogen storage alloys.

Research Progress and Application Prospects of Solid-State Hydrogen Storage Technology

“…It can be seen that each type of material has advantages and disadvantages in terms of their hydrogen storage capacity, thermodynamics, kinetics, etc. For example, the AB 5 type has a moderate hydrogen storage capacity but a high cost, the A 2 B type has a high hydrogen storage capacity but a high dehydrogenation temperature, and complexes have an even higher hydrogen storage capacity but are prone to decomposition during dehydrogenation [60][61][62][63]. Therefore, developing new hydrogen storage materials with high capacity, fast kinetics, and a long cycle life is the focus of current basic research on solid-state hydrogen storage.…”

Possibility of As-Cast Applications on β-Type Titanium Alloys Proposed in the Newly Expanded Area of <i>Bo_t-Md_t</i> Diagram

“…8 and 9, and these intermetallic compounds were known as brittle phases. 45,46) The ternary intermetallic TiCrMn is a partial manganese substituted derivative of the TiCr 2 and the substitution of the Cr by Mn in the lattice of TiCr 2 made the atomic stacking closer. 47) According to the microstructures of ten types of ¢-Ti alloys, the phase boundary between the mono ¢ phase and the dual ¢ plus intermetallic compound phases were roughly identified in the newly expanded area of the Bo t -Md t diagram for the first time.…”

Chemical material as a hydrogen energy carrier: A review

“…Notably, storing gaseous hydrogen at high pressure (350~700 bar) in storage tanks and transporting it via tube trailers is a prominent approach, as is liquefying gaseous hydrogen (−253 ℃) and storing it in dedicated storage tanks. These methods require specialized infrastructure due to the high energy density of hydrogen, and liquefaction, in particular, incurs significant energy consumption [46][47][48][49][50][51][52][53][54][55][56][57][58][59]. As alternatives, research is underway on physically adsorbing hydrogen onto porous materials such as Metal Organic Frameworks (MOFs) and Carbon nanotubes for storage and transportation, as well as chemically binding hydrogen to metals to enable solid-state storage and desorption, as seen in metal hydrides.…”