Abstract
Ti-based hydrogen storage alloy is one of the most common solid-state hydrogen storage materials due to its high hydrogen absorption capacity, low dehydrogenation temperature and rich resources. This paper mainly presents the influence of several different preparation methods of Ti-based hydrogen storage alloys on the hydrogen storage performance including traditional preparation methods (smelting, rapid quenching and mechanical alloying) and novel methods by plastic deformation (cold rolling, equal channel angular pressing and high-pressure torsion). The microstructure analysis and hydrogen storage properties of Ti-based alloy are summarized thoroughly corresponding with the preparation processes mentioned above. It was found that slight introduction of lattice defects including dislocation, grain boundary, sub-grain boundary and cracks by severe plastic deformation (SPD) was beneficial to improve the hydriding/dehydriding kinetic characteristic. However, the nonuniform composition and residual stress of the alloy may be caused by SPD, which is not conducive to the improvement of hydrogen storage capacity. In the future, it would be expected that new methods and technologies combined with dopant and modification are applied to Ti-based hydrogen storage alloys to make breakthroughs in practical application.
Highlights
This paper mainly presents the influence of several different preparation methods of Ti-based hydrogen storage alloys on the hydrogen storage performance including traditional preparation methods and novel methods by plastic deformation
From the above several preparation methods, melting and ball milling (BM) can promote the uniformity of the internal composition and contribute to the industrialization of Ti-based alloy
The plastic deformation (CR, Equal channel angular pressing (ECAP), high-pressure torsion (HPT)), BM and Rapid quenching (RQ) play a momentous role in grain refinement and the introduction of microstructure defects
Summary
Compared with magnesium-based hydrogen storage alloys, Ti-based alloy has lower working temperature and enthalpy change value [12] [13]. It is commonly used as solid-state hydrogen storage, Ni-MH rechargeable battery as well as metal hydride compressor [14]. Ti-based hydrogen storage alloys was prone to activation difficulty, surface poisoning, be poor kinetic characteristic and low dehydrogenation capacity at room temperature [15] [16]. This paper summarizes and analyzes the preparation methods in recent years to further understand the influence of the preparation methods on the hydrogen storage properties of the sample (kinetic performance, cyclic stability, hydrogen absorption/dehydrogenation capacity, etc.). It is expected to provide beneficial information to the researchers and promote the development of hydrogen storage alloys in the future
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