Abstract
As a kind of cost-efficient hydrogen storage materials with high hydrogen capacity and light weight, Mg-based alloys have attracted much attention. This review introduces an effective technique in producing bulk ultrafine-grained (UFG) Mg alloys and promoting its hydrogen storage property, namely, equal-channel angular pressing (ECAP). This paper briefly describes the technical principle of ECAP and reviews the research progress on hydrogen storage properties of ECAP-processed Mg alloys. Special attention is given to their hydrogen storage behaviors including hydrogen storage dynamics, capacity, and cycling stability. Finally, it analyzes the factors that affect the hydrogen storage properties of ECAP-processed Mg alloys, such as the grain sizes, lattice defects, catalysts, and textures introduced by ECAP process.
Highlights
The US Department of Energy (DOE) has foretold a 37% increase in the world’s energy demand by2035, compared with that in 2008 [1,2]
Metal hydride has attracted attention worldwide for its safe, cost-effective properties compared with other storage options such as high pressure gas tanks and cryogenic liquid, and it has already become a hot topic in the field of hydrogen storage
Analogical results can be found in other studies, which suggests that the equal-channel angular pressing (ECAP) followed by Cold Rolling (CR) could be a useful method in improving bulk magnesium hydrogen storage material
Summary
Metals 2017, 7, 324 such as morphology and surface structures as well as the purity of the Mg alloy are among the factors influencing H2 dissociation; (2) Diffusion of the dissociated H atoms in the Mg alloy In this stage, the microstructures of Mg including the grain size and grain boundaries represent the most important issues for the diffusion of H atoms inside the metal; (3) The formation of the hydrogen-containing solid solution inside Mg. In this stage, the microstructures of Mg including the grain size and grain boundaries represent the most important issues for the diffusion of H atoms inside the metal; (3) The formation of the hydrogen-containing solid solution inside Mg In this stage, microstructure defects such as dislocations and vacancies are necessary aspects to be considered; (4) Phase transformation takes place between H atoms and Mg to form MgH2. This work will serve to enrich the preparation of solid-state hydrogen storage systems in order to realize the long-term application of Mg-based hydrogen storage alloys
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