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Volume 2018, Article ID 5736742, 13 pages
https://doi.org/10.1155/2018/5736742
Research Article

Structural and Kinetic Hydrogen Sorption Properties of Zr0.8Ti0.2Co Alloy Prepared by Ball Milling

1Science and Technology on Surface Physics and Chemistry Laboratory, P.O. Box 9072-35, Mianyang 621908, China
2Institute of Materials, China Academy of Engineering Physics, P.O. Box 9071-12, Mianyang 621907, China
3State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China

Correspondence should be addressed to Huaqin Kou; moc.621@niqauhuok and Wenhua Luo; nc.peac@auhnewoul

Received 27 October 2017; Revised 31 December 2017; Accepted 14 January 2018; Published 12 March 2018

Academic Editor: Huaijun Lin

Copyright © 2018 Hui He et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effects of ball milling on the hydrogen sorption kinetics and microstructure of Zr0.8Ti0.2Co have been systematically studied. Kinetic measurements show that the hydrogenation rate and amount of Zr0.8Ti0.2Co decrease with increasing the ball milling time. However, the dehydrogenation rate accelerates as the ball milling time increases. Meanwhile, the disproportionation of Zr0.8Ti0.2Co speeds up after ball milling and the disproportionation kinetics is clearly inclined to be linear with time at 500°C. It is found from X-ray powder diffraction (XRD) results that the lattice parameter of Zr0.8Ti0.2Co gradually decreases from 3.164 Å to 3.153 Å when the ball milling time extends from 0 h to 8 h, which is mainly responsible for the hydrogen absorption/desorption behaviors. In addition, scanning electron microscope (SEM) images demonstrate that the morphology of Zr0.8Ti0.2Co has obviously changed after ball milling, which is closely related to the hydrogen absorption kinetics. Besides, high-resolution transmission electron microscopy (HRTEM) images show that a large number of disordered microstructures including amorphous regions and defects exist after ball milling, which also play an important role in hydrogen sorption performances. This work will provide some insights into the principles of how to further improve the hydrogen sorption kinetics and disproportionation property of Zr0.8Ti0.2Co.