Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 667, Issue -, Pages 191-197Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.01.180
Keywords
Metal nanoparticle; Mg2Ni-Based alloys; Hydrogen storage; Gas absorption; Electrochemical properties
Categories
Funding
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- NSFC [U1201241, 11375020, 51431001]
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Mg2Ni-based alloys have been intensively investigated as gaseous hydrogen absorption materials and negative electrode materials for Nickel-Metal Hydride (Ni-MH) battery. In this work, three Mg2Ni-based samples (micrometer Mg2Ni, nanometer Mg2Ni and nanometer Mg2Ni0.75Cu0.25) were synthesized from Mg, Ni and Cu nanoparticles and commercially available micrometer Ni particles. The metal nano particles were fabricated by hydrogen plasma metal reaction technique. The structure and morphology of these three Mg2Ni-based samples were studied. Gaseous hydrogen absorption and electrochemical properties of these samples were investigated and compared. Amongst these three samples, the nano meter Mg2Ni shows best gas absorption kinetics of 3.0 wt.% in 1 min under 4 MPa hydrogen at 623 K; the nanometer Mg2Ni0.75Cu0.25 sample shows a highest first cycle electrochemical capacity of 346 mAh/g. The effect of nanostructure and partial substitution on gas absorption and electrochemical performance was clarified. (c) 2016 Elsevier B.V. All rights reserved.
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