期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 36, 期 1, 页码 1159-1166出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.06.089
关键词
Nanopowders; Nanonickel additives; Magnesium hydride; Hydrogen storage materials; Hydrogenation catalysts; Transmission electron microscopy
资金
- Natural Sciences and Engineering Research Council of Canada
- Vale Inc Ltd.
- NRCan PERD Hydrogen, Fuel Cell Research and Development program
Transmission electron microscopy was used to study the morphology and character of new nanometric-scale Ni (nano-Ni) powders produced by a chemical vapour deposition process by Vale Inca (Canada). The morphology of the nano-Ni powder is filamentary or aciniform, and the Ni crystallites contain a relatively low density of lattice defects, mainly twins. Oxygen and carbon impurities formed surface films. In contrast, a submicro-Ni powder contains less C and a much lower O concentration, resulting in significantly less surface film formation compared to the finer nano-Ni. Catalytic properties of these powders, as an additive to MgH2 hydrogen storage media, have been investigated. When ball-milled with high-enthalpy hydrides, viz. MgH2, the nano-Ni exhibits strong catalytic properties and lowers greatly the activation energy (E-A) by 50%, but does not affect the enthalpy. Consequently, the desorption temperature can be lowered by almost 100 degrees C. It is anticipated that when ball-milled with low-enthalpy complex hydrides, this new nanonickel catalyst will have a paramount effect on destabilization of mostly kinetically stabilized hydride complexes. The peculiar C and oxide coatings may affect sintering during hydride discharging. Crown Copyright (C) 2010 Published by Elsevier Ltd on behalf of Professor T. Nejat Veziroglu. All rights reserved.
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