Abstract
The electrochemical behavior of TiNi(1−x)Nbx (x = 0, 0.05, 0.1, 0.2) ternary intermetallic compounds synthesized by mechanical alloying was investigated and compared to that of binary TiNi. The structure of 20-h milled product with initial stoichiometric composition of TiNi0.95Nb0.05 was found to be amorphous/nanostructured. Upon cycling, this ternary milled product exhibited the highest discharge capacity (166.1 mA h/g) after 10 cycles and best cycle stability (∼91%) while those of the binary TiNi were 147 mA h/g and ∼83%, respectively; i.e., slight amount of Nb substitution (0.05 mol) for Ni in the TiNi not only increased discharge capacity and cycle stability but also enhanced the kinetics of hydrogen absorption/desorption through increasing the exchange current density and hydrogen diffusion coefficient. However, additional Nb content was found to have negative effect on electrochemical properties; this was related to the existence of Nb element in addition to the ternary amorphous/nanocrystalline structures.
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ACKNOWLEDGMENTS
Partial financial support by Center of Excellence for Surface Engineering and Corrosion Protection of Industries, University of Tehran, and Iran Nanotechnology Initiative Council are gratefully acknowledged.
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Abbasi, R., Kashani-Bozorg, S.F. Electrochemical and kinetic performance of amorphous/nanostructured TiNi-based intermetallic compound with Nb substitution synthesized by mechanical alloying. Journal of Materials Research 33, 3774–3784 (2018). https://doi.org/10.1557/jmr.2018.231
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DOI: https://doi.org/10.1557/jmr.2018.231