Development of new type Ni–Mg texture-like structure hydrogen absorber

✍ Scribed by Che-Wei Hsu; Sheng-Long Lee; Fu-Kai Hsu; Jing-Chie Lin

• Book ID: 103833117
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 695 KB
• Volume: 36
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2011.02.012

✦ Synopsis

This study demonstrated the feasibility of a novel Mg vapor deposition treatment on Ni foam to synthesize a NieMg texture-like structure as a new type of hydrogen absorber. Energy dispersive spectrometry (EDS) yielded an estimative value of the weight percent ratio of Ni and Mg of 71.8 and 20.5 in as-prepared NieMg texture-like structure. The microstructural changes were also characterized by X-ray diffraction (XRD) and the formed hydride tetragonal-MgH 2 was confirmed. The unique combination of large surface area of catalyst (Ni) and hydrogen acceptor (Mg) reduced the hydrogenation and dehydrogenation temperatures and performed the capability of reversible hydrogen storage capacity up to 0.72 wt.% H 2 at 25 C. NieMg texture-like structure achieved significant hydridingedehydriding performances at lower temperature than traditional Mg-based hydrogen storage alloys. A possible hydrogen storage mechanism was also discussed where the catalytic Ni foam with large surface area was shown to be a vital factor in improving hydridingedehydriding kinetics.