Physicochemical and electrochemical hydriding-dehydriding characteristics of amorphous MgNi x ( x =1.0, 1.5, 2.0) alloys prepared by mechanical alloying

Zhang, Shu G.; Hara, Yasunori; Suda, S.; Morikawa, Tsutomu; Inoue, Hiroshi; Iwakura, Chiaki

doi:10.1007/s100089900102

Cited by 4 publications

(3 citation statements)

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“…However the high hydrogen absorption and desorption temperature and poor kinetics have greatly hampered the application of Mg-based materials for hydrogen storage, especially for on-board storage. To improve the properties, mechanical alloying (MA) method has been introduced into Mg-Ni system by many groups [2][3][4][5][6][7][8][9][10]. MA process is a high-energy operation of repeated welding, fracturing and re-welding of sample powders [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and hydrogen storage properties of nanostructured Mg–Ni BCC alloys

Shao

Asano

Enoki

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Preparation and hydrogen storage properties of nanostructured Mg–Ni BCC alloys

Shao

Asano

Enoki

et al. 2009

Journal of Alloys and Compounds

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“…Mg 2 Ni was the first alloy that was extensively studied in this respect [23][24][25]. Even though, this alloy has a better performance in terms of thermodynamics and kinetics, the hydrogen content in Mg 2 NiH 4 is only about 3.6 wt.%, which is less than half of that of pure MgH 2 .…”

Section: Magnesium-based Binary Alloysmentioning

confidence: 99%

Electrochemical and Optical Properties of Magnesium-Alloy Hydrides Reviewed

2012

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Abstract:As potential hydrogen storage media, magnesium based hydrides have been systematically studied in order to improve reversibility, storage capacity, kinetics and thermodynamics. The present article deals with the electrochemical and optical properties of Mg alloy hydrides. Electrochemical hydrogenation, compared to conventional gas phase hydrogen loading, provides precise control with only moderate reaction conditions. Interestingly, the alloy composition determines the crystallographic nature of the metalhydride: a structural change is induced from rutile to fluorite at 80 at.% of Mg in Mg-TM alloy, with ensuing improved hydrogen mobility and storage capacity. So far, 6 wt.% (equivalent to 1600 mAh/g) of reversibly stored hydrogen in Mg y TM (1-y) H x (TM: Sc, Ti) has been reported. Thin film forms of these metal-hydrides reveal interesting electrochromic properties as a function of hydrogen content. Optical switching occurs during (de)hydrogenation between the reflective metal and the transparent metal hydride states. The chronological sequence of the optical improvements in optically active metal hydrides starts with the rare earth systems (YH x ), followed by Mg rare earth alloy hydrides (Mg y Gd (1-y) H x ) and concludes with Mg transition metal hydrides (Mg y TM (1-y) H x ). In-situ optical characterization of gradient thin films during (de)hydrogenation, denoted as hydrogenography, enables the monitoring of alloy composition gradients simultaneously.

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“…In the past several decades, extensive investigations have been focused on the electrochemical behavior of hydrogen storage alloys, as negative electrode in rechargeable Ni-MH battery, including AB 5 series [1,2], AB 2 series [3][4][5][6], Ti-Ni series [7][8][9][10][11], Mg-based amorphous [12][13][14] and V-based solid solution alloy [15][16][17][18]. As the main active commercial material, AB 5 series alloys' electrode can reach 280-320 mAh/g.…”

Section: Introductionmentioning

confidence: 99%