TY - JOUR
T1 - Hydrogen storage and electrochemical properties of the Ti 0.32Cr0.43-x-yV 0.25FexMny (x = 0-0.055, y = 0-0.080) alloys and their composites with MmNi3.99Al0.29Mn 0.3Co0.6 alloy
AU - Lee, Han Gyo
AU - Chourashiya, M. G.
AU - Park, Choong Nyeon
AU - Park, Chan Jin
N1 - Funding Information:
This work was supported by the Basic Research Laboratories (BRL) Program (2011-0001567) of the National Research Foundation of Korea (NRF) and funded by the Korean Ministry of Education, Science and Technology (MEST).
PY - 2013/6/25
Y1 - 2013/6/25
N2 - In this paper, we investigated the hydrogen storage and electrochemical characteristics of the bcc type Ti0.32Cr0.43- x-yV0.25FexMn y (x = 0, 0.03, 0.055; y = 0, 0.03, 0.055, 0.080) alloys and their composites with the AB5 type MmNi3.99Al 0.29Mn0.3Co0.6 (Mm: misch-metal) alloy. The maximum hydrogen capacities of the bcc alloys were proportional to the lattice parameters of the alloys. The increased substitution of Fe/Mn for Cr in the bcc alloys increased the plateau pressure in the respective pressure-composition isotherms. In particular, the plateau pressure was more sensitive to Fe substitution than Mn substitution. Electrochemically, the Ti 0.32Cr0.345V0.25Fe0.03Mn 0.055 composite alloy electrode showed the optimum discharge capacity and cyclability because it had the beneficial effects of both Fe and Mn substitutions. Furthermore, among the other composite alloy electrodes, the Ti0.32Cr0.345V0.25Fe0.03Mn 0.055 composite alloy electrode showed the smallest charge transfer resistance, which allowed its easy activation and, higher rate capability.
AB - In this paper, we investigated the hydrogen storage and electrochemical characteristics of the bcc type Ti0.32Cr0.43- x-yV0.25FexMn y (x = 0, 0.03, 0.055; y = 0, 0.03, 0.055, 0.080) alloys and their composites with the AB5 type MmNi3.99Al 0.29Mn0.3Co0.6 (Mm: misch-metal) alloy. The maximum hydrogen capacities of the bcc alloys were proportional to the lattice parameters of the alloys. The increased substitution of Fe/Mn for Cr in the bcc alloys increased the plateau pressure in the respective pressure-composition isotherms. In particular, the plateau pressure was more sensitive to Fe substitution than Mn substitution. Electrochemically, the Ti 0.32Cr0.345V0.25Fe0.03Mn 0.055 composite alloy electrode showed the optimum discharge capacity and cyclability because it had the beneficial effects of both Fe and Mn substitutions. Furthermore, among the other composite alloy electrodes, the Ti0.32Cr0.345V0.25Fe0.03Mn 0.055 composite alloy electrode showed the smallest charge transfer resistance, which allowed its easy activation and, higher rate capability.
KW - Composite alloys
KW - Discharge capacities
KW - Ni-MH batteries
KW - Pressure-composition isotherms
KW - Ti-Cr-V alloys
UR - http://www.scopus.com/inward/record.url?scp=84875657755&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2013.03.004
DO - 10.1016/j.jallcom.2013.03.004
M3 - 文章
AN - SCOPUS:84875657755
SN - 0925-8388
VL - 566
SP - 37
EP - 42
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -