@article{31b68ad1f6774fe8bc48f20d6981cfe0,
title = "Effect of ball-milling duration and dehydrogenation on the morphology, microstructure and catalyst dispersion in Ni-catalyzed MgH2 hydrogen storage materials",
abstract = "The effects of high-energy ball-milling on catalyst morphology and dispersion as a function of milling duration and on hydrogen desorption were investigated. Samples of MgH2 doped with 0.05 Ni catalyst were examined after 1, 5 and 10 h of milling. Longer milling durations produced finer catalyst particle sizes and more uniform dispersions, but yielded higher hydrogen desorption temperatures. This behavior is attributed to the formation of Mg2NiH4 with increased milling times. Electron tomography was used to show that the Ni particles reside both inside and outside the MgH2 particles. On dehydrogenation there was a redistribution of catalyst and continued formation of Mg2Ni. The formation of this phase is proposed to explain the reported degradation of hydrogen capacity and the change in kinetics of this system with cycling.",
keywords = "Complex hydrides, Electron hydrogen-storage materials, Electron tomography, In situ transmission electron microscopy (TEM), STEM HAADF",
author = "House, {Stephen D.} and Vajo, {John J.} and Chai Ren and Rockett, {Angus A.} and Robertson, {Ian M.}",
note = "Funding Information: This work was supported through the U.S. Department of Energy under grant No. DE-FC36-05GO15064 . The authors acknowledge the use of the facilities in the Center of Microanalysis of Materials at the University of Illinois. The TGA work performed at the University of Utah by Chai Ren was supported by the U.S. Department of Energy (DOE) under contract number DE-AR0000173 and National Science Foundation (Grant No. 0933778 ). The tilt series for electron tomography and additional EDS was acquired with assistance from Nestor J. Zaluzec at the Electron Microscopy Center at Argonne National Laboratory, a U.S. Department of Energy Office of Science Laboratory operated under Contract No. DE-AC02-06CH11357 by U Chicago Argonne, LLC. The authors also acknowledge the International Institute for Carbon-Neutral Energy Research (I2CNER) sponsored by the Japanese Ministry of Education, Culture, Sports, Science and Technology. Publisher Copyright: {\textcopyright} 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.",
year = "2015",
month = mar,
doi = "10.1016/j.actamat.2014.11.047",
language = "English (US)",
volume = "86",
pages = "55--68",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",
}