Quaternary Quasicrystal Alloys for Hydrogen Storage Technology
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.96
Quaternary Quasicrystal Alloys for Hydrogen Storage Technology Amal Azraai Azuha1,*, Alicja Klimkowicz2, Akito Takasaki3 1
Course of Mechanical Engineering, Graduate School, Shibaura Institute of Technology, Tokyo, Japan SIT Research Laboratories, Shibaura Institute of Technology, Tokyo, Japan 3 Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Tokyo, Japan * [email protected] 2
ABSTRACT The Ti-Zr-Ni quasicrystal alloys have prospected to be one of the promising materials for hydrogen storage. This is because this type of quasicrystal contains 140 interstitial sites (Tsites) constituted in the Bergman Cluster that could accommodate hydrogen. The number of available sites is far greater than the number found in regular crystals, therefore the improvement of hydrogen storage capacity could be expected. For this study, we focus on the effect of substitution of Cr, in place of Ni in Ti-Zr-Ni amorphous and quasicrystal alloys. The studied samples are synthesized by the combination of mechanical alloying and sintering process. The subsequent measurements of electrochemical hydrogenation and dehydrogenation are carried out by a three-electrode cell at room temperature. The studied samples are structurally characterized by X-ray diffraction and their morphology is analyzed by scanning electron microscope and transmission electron microscope. The influence of the 4th substituted element on the possibility of a new-formed Cr quasicrystalline phase and the potential improvement of hydrogenation and dehydrogenation kinetics for both amorphous and quasicrystalline phase is evaluated. Our measurements showed the maximum discharge capacity achieved by Ti45Zr38Ni7Cr10 amorphous and Ti45Zr38Ni12Cr5 i-phase electrodes at a current density of 15 mA·g-1 to be 9.8 mAh·g-1and 55.2 mAh·g-1 respectively. The maximum estimated H/M value for the Ti45Zr38Ni12Cr5 i-phase electrode reached 1.36. These results are encouraging and show the merit of the usage of quasicrystals as hydrogen storage materials. Keywords: quasicrystal; i-phase; amorphous phase; hydrogen storage; electrochemical hydrogenation; mechanical alloying; microstructure
INTRODUCTION: The uncertainty on the present technological capability to fill the enormous energy demands of the ever-increasing world’s population would pose a tremendous
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challenge as we progress through the future. A heavy reliance on the limited supply of non-renewable energy resources in the present time, primarily in the usage of fossil fuels (petroleum, natural gas, coal) would directly contribute to the imminent depletion of this type of resource, hence would exacerbate the global energy crisis. Furthermore, the environmental issues caused by the extensi
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