Browsing NTNU Open by Author "Denys, Roman Volodymyrovich"
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Cell Performance Comparison between C14- and C15-Predomiated AB2 Metal Hydride Alloys
Young, Kwo-Hsiung; Koch, John M.; Wan, Chubin; Denys, Roman Volodymyrovich; Yartys, Volodymyr (Journal article, 2017)The performance of cylindrical cells made from negative electrode active materials of two selected AB2 metal hydride chemistries with different dominating Laves phases (C14 vs. C15) were compared. Cells made from Alloy C15 ... -
Comparison of C14- and C15-Predomiated AB2 Metal Hydride Alloys for Electrochemical Applications
Young, Kwo-Hsiung; Nei, Jean; Wan, Chubin; Denys, Roman Volodymyrovich; Yartys, Volodymyr (Journal article, 2017)Herein, we present a comparison of the electrochemical hydrogen-storage characteristics of two state-of-art Laves phase-based metal hydride alloys (Zr21.5Ti12.0V10.0Cr7.5Mn8.1Co8.0Ni32.2Sn0.3Al0.4 vs. Zr25.0Ti6.5V3.9Mn22 ... -
Effect of Mg content in the La3-xMgxNi9 battery anode alloys on the structural, hydrogen storage and electrochemical properties
Wan, ChuBin; Hu, Weikang; Denys, Roman Volodymyrovich; Nwakwuo, Christopher; Solberg, Jan Ketil; Yartys, Volodymyr (Peer reviewed; Journal article, 2021)The present work is focused on the studies of structure, hydrogen storage and electrochemical properties of the La3-xMgxNi9 (x = 1.0, 1.1 and 1.2) alloys as active materials of negative electrodes in the Nickel-Metal Hydride ... -
Electrochemical studies and phase-structural characterization of a high-capacity La-doped AB(2) Laves type alloy and its hydride
Wan, ChuBin; Denys, Roman Volodymyrovich; Lelis, M.; Milcius, D; Yartys, Volodymyr (Journal article; Peer reviewed, 2019)This work was focused on studies of structural and electrochemical properties of the La-doped AB2-type Zr/Ti-based metal hydride anode alloys. The Ti0.2Zr0.8La0-0.05Ni1.2Mn0.7V0.12Fe0.12 alloys were characterized using ... -
Hydrides of Laves type Ti–Zr alloys with enhanced H storage capacity as advanced metal hydride battery anodes
Wijayanti, Ika Dewi; Denys, Roman Volodymyrovich; Suwarno, Suwarno; Volodin, Alexei A.; Lototskyy, Mykhaylo V.; Guzik, Matylda N.; Nei, Jean; Young, Kwo; Roven, Hans Jørgen; Yartys, Volodymyr (Peer reviewed; Journal article, 2020)The present work was focused on the studies of the effect of variation of stoichiometric composition of Ti–Zr based AB2±x Laves phase alloys by changing the ratio between A (Ti + Zr) and B (Mn + V + Fe + Ni) components ... -
In operando neutron diffraction study of LaNdMgNi9H13 as a metal hydride battery anode
Nazer, N.S.; Denys, Roman Volodymyrovich; Yartys, Volodymyr; Hu, Weikang; Latroche, M.; Cuevas, F; Hauback, Bjørn; Henry, P.F.; Arnberg, Lars (Journal article; Peer reviewed, 2017-03-01)La2MgNi9-related alloys are superior metal hydride battery anodes as compared to the commercial AB5 alloys. Nd-substituted La2-yNdyMgNi9 intermetallics are of particular interest because of increased diffusion rate of ... -
LaNi5-assisted hydrogenation of MgNi2 in the hybrid structures of La1.09Mg1.91Ni9D9.5 and La0.91Mg2.09Ni9D9.4
Denys, Roman Volodymyrovich; Yartys, Volodymyr; Gray, Evan MacA.; Webb, Colin J. (Journal article; Peer reviewed, 2015)This work focused on the high pressure PCT and in situ neutron powder diffraction studies of the LaMg2Ni9-H2 (D2) system at pressures up to 1,000 bar. LaMg2Ni9 alloy was prepared by a powder metallurgy route from the LaNi9 ... -
Nanostructured magnesium silicide Mg2Si and its electrochemical performance as an anode of a lithium ion battery
Sainudeen Nazer, Nazia; Denys, Roman Volodymyrovich; Andersen, Hanne Flåten; Arnberg, Lars; Yartys, Volodymyr (Journal article, 2017)Nano-crystalline Mg2Si (Mg67Si33) and its Si-rich eutectic (Mg47Si53) composition were synthesized by hydrogen desorption-recombination process, casting and rapid solidification techniques. The synthesis of Mg2Si meets ... -
Structure–properties relationship in RE3−xMgxNi9H10–13 (RE = La,Pr,Nd) hydrides for energy storage
Yartys, Volodymyr; Denys, Roman Volodymyrovich (Journal article; Peer reviewed, 2014)Ternary RE3xMgxNi9 intermetallics are promising battery electrode materials. Studies of the structure– properties relationships in the (La,Pr,Nd)3xMgxNi9H10–13 hydrides and initial intermetallics revealed the following: ... -
Studies of the effect of melt spinning on the electrochemical properties of the AB2 Laves phase alloys
Wijayanti, Ika Dewi; Mølmen, Live; Denys, Roman Volodymyrovich; Guzik, Matylda Natalia; Gorsse, Stéphane; Yartys, Volodymyr (Peer reviewed; Journal article, 2021)A comparative study of the effect of melt spinning on the electrochemical properties of the C14 and C15 AB2 alloys has been performed. The wheel speeds of 630, 2100, and 4100 cm/s were applied during the rapid solidification ... -
Studies of Zr-based C15 type metal hydride battery anode alloys prepared by rapid solidification
Wijayanti, Ika Dewi; Mølmen, Live; Denys, Roman Volodymyrovich; Nei, Jean; Gorsse, Stéphane; Guzik, Matylda N.; Young, Kwo; Yartys, Volodymyr (Journal article; Peer reviewed, 2019)The objective of the present work was to study an interrelation between the conditions of the rapid solidification casting and electrochemical properties of a C15 Laves-type Zr-based metal hydride battery anode alloy. A ... -
Study of hydrogen storage and electrochemical properties of AB2-typeTi0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12alloy
Volodin, Alexei A.; Denys, Roman Volodymyrovich; Wan, ChuBin; Wijayanti, Ika Dewi; Suwarno, Suwarno; Tarasov, Boris P.; Antonov, Vladimir E.; Yartys, Volodymyr (Journal article; Peer reviewed, 2019)A C15 AB2 Laves-type Ti0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12 alloy was prepared by arc melting and annealing. Phase-structural composition, microstructure, hydrogen absorption-desorption properties, thermodynamic and ...