Journal
MATERIALS LETTERS
Volume 65, Issue 19-20, Pages 2868-2871Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2011.06.059
Keywords
Ti-V-Ni-Mn-Cr alloy; Icosahedral quasicrystalline phase; Electrochemical hydrogen storage; Electrocatalytic activity
Funding
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [20921002]
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The substitution of manganese and chromium for 6 at.% nickel in Ti(1.6)V(0.4)Ni leads the rapid quenching synthesis of quinary icosahedral phase (i-phase) evidenced by the observations of 2-. 3- and 5-fold symmetries. As negative electrode in Ni-MH battery, the quinary Ti-V-Ni-Mn-Cr i-phase can deliver a maximum discharge capacity of 278 mAh g(-1) at 30 mA g(-1) larger than that of Ti(1.6)V(0.4)Ni master alloy anode owing to Mn and/or Cr doping. After a preliminary test of 30 consecutive cycles the cycling capacity retention rate (CR%) is 80%. The strong chemisorption of hydrogen shown in cyclic voltammetric (CV) response indicates that the electrocatalytic activity improvement for the i-phase negative electrode is highly demanded. (C) 2011 Elsevier B.V. All rights reserved.
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