Hydrogen storage properties of (Mg2Ni)100-xAgx powder prepared by mechanical alloying

Jin Yi Chen, Xian Ke Lin, Zhong Kui Lin, Pei Yao Li

Research output: Contribution to journalArticlepeer-review

Abstract

In many hydrogen storage methods, metal hydrides proposed to have some advantages such as greater volumetric efficiency, relatively low pressure, and high safety issue have attracted many R and D interests. Among a number of alloys, A2B type Mg2Ni intermetallic alloy due to its high hydrogen absorption capacity, lightweight and low cost is considered as a promising candidate for hydrogen storage applications. In the present study, an intermetallic powder with a desired composition of (Mg2Ni)100-xAgx (x = 0, 1.0 and 5.0) was directly prepared by mechanical alloying from pure Mg, Ni and Ag elemental powders under an inert gas. The structural transformations of as-milled powder mixtures in varied milling times were examined by X-ray diffraction (XRD) technique. The hydrogen storage kinetics, pressure-composition-temperature (P-C-T) curves and thermal analysis of 15 h milled Mg2Ni / Ag powders were evaluated. The experimental results showed that the 15 h as-milled powders were identified as a nanocrystalline mixture of Mg2Ni, Mg and Ni. Silver addition significantly improved the hydrogen absorption capacity of Mg2Ni, revealing that the absorbed hydrogen content and reversible hydrogen content at 350 °C were increased from 3.14 to 3.83%(ω) and from 2.40 to 3.0%(ω), respectively, for the 15 h milled Mg2Ni powder at silver content of 1.0%.

Original languageEnglish
Pages (from-to)258-262
Number of pages5
JournalGuocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering
Volume6
Issue numberSUPPL. 2
Publication statusPublished - Dec 2006
Externally publishedYes

Keywords

  • Ag
  • Hydrogen absorption
  • Mechanical alloying
  • MgNi
  • X-ray diffraction

ASJC Scopus subject areas

  • Chemical Engineering(all)

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