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RETRACTED - High discharge capacities of Ti-based quasicrystal electrodes synthesized by mechanical alloying

Published online by Cambridge University Press:  12 April 2018

DEDETEMO KIMILITA PATRICK ,
AKITO TAKASAKI  and
ALICJA KLIMKOWICZ
DEDETEMO KIMILITA PATRICK*
Affiliation:
Global Course of Science and Engineering, Graduate School of Engineering and Science, Shibaura Institute of Technology, Toyosu, Koto-ku, Tokyo, 135-8548, Japan.
AKITO TAKASAKI
Affiliation:
Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Toyosu, Koto-ku, Tokyo, 135-8548, Japan.
ALICJA KLIMKOWICZ
Affiliation:
Department of Engineering Science and Mechanics, Shibaura Institute of Technology, Toyosu, Koto-ku, Tokyo, 135-8548, Japan.
*
*Dedetemo Kimilita Patrick [email protected]
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Abstract

Ti-based quasicrystals are well known to store a high capacity of hydrogen exceeding the density of liquid hydrogen. This fact is due to that TiZrNi contain a large number of tetrahedral sites formed with Ti and Zr atoms that are chemical affinity with hydrogen. TiZrNi quasicrystal absorbs hydrogen up to host metal ratio (H/M) value near to 2.0. The disadvantage is due to the low equilibrium pressure. To solve this problem, we substituted Ti with a small amount of vanadium (V), with the nominal composition Ti45−x VxZr38Ni17 (x = 5, 10, 15) and synthesized by mechanical alloying. The subsequent annealing in vacuum conditions converted the amorphous into an icosahedral quasicrystal (I-phase) with face-centered cubic (FCC) Ti2Ni-type crystal. As the results, we investigated the discharge capacity for both amorphous and quasicrystal electrodes using three electrodes system (working, reference and counter electrodes) at room temperature. The highest discharge capacities obtained were 81.45 mAh/g recorded for amorphous electrode and 318.4 mAh/g for quasicrystal whose compositions is Ti35V10Zr38Ni17 at discharge current density of 15 mA/g. X-ray diffraction measurement was performed to provide the structural information on materials before and after hydrogenation. Microstructures of the materials were studied using an electron scanning microscope and the chemical compositions were confirmed using an EDX-analysis.

Keywords

hydrogenationquasicrystalamorphousmechanical alloyingelectrochemical synthesis
Type
Articles
Information
MRS Advances , Volume 3 , Issue 38: African Materials Research Society 2017 , 2018 , pp. 2271 - 2279
Copyright
Copyright © Materials Research Society 2018 

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