TY - JOUR
T1 - Microstructure and electrochemical hydrogen storage characteristics of La0.67Mg0.33-xCaxNi2.75Co 0.25 (x = 0-0.15) electrode alloys
AU - Dong, Zhenwei
AU - Wu, Yaoming
AU - Ma, Liqun
AU - Wang, Lidong
AU - Shen, Xiaodong
AU - Wang, Limin
PY - 2011/2
Y1 - 2011/2
N2 - The microstructure and electrochemical hydrogen storage characteristics of La0.67Mg0.33-xCaxNi2.75Co 0.25 (x = 0, 0.05, 0.10 and 0.15) alloys are investigated. The results show that all alloys mainly consist of (La, Mg)Ni3 and LaNi5 phases, besides a small amount of (La, Mg)2Ni 7 phase. The cycle stability (S80) after 80 charge/discharge cycles of all alloy electrodes first increases from 60.1% (x = 0) to 64.2% (x = 0.05), then decreases to 45.9% (x = 0.15). The high rate dischargeability of all alloy electrodes first increases from 52.6% (x = 0) to 61.4% (x = 0.10), then decreases to 57.2% (x = 0.15). Moreover, the charge-transfer resistance (Rct) first decreases from 168.2 mΩ (x = 0) to 125.7 mΩ (x = 0.10), then increases to 136.6 mΩ (x = 0.15). All the results indicate that the substitution of Mg with a certain amount of Ca can improve the overall electrochemical characteristics.
AB - The microstructure and electrochemical hydrogen storage characteristics of La0.67Mg0.33-xCaxNi2.75Co 0.25 (x = 0, 0.05, 0.10 and 0.15) alloys are investigated. The results show that all alloys mainly consist of (La, Mg)Ni3 and LaNi5 phases, besides a small amount of (La, Mg)2Ni 7 phase. The cycle stability (S80) after 80 charge/discharge cycles of all alloy electrodes first increases from 60.1% (x = 0) to 64.2% (x = 0.05), then decreases to 45.9% (x = 0.15). The high rate dischargeability of all alloy electrodes first increases from 52.6% (x = 0) to 61.4% (x = 0.10), then decreases to 57.2% (x = 0.15). Moreover, the charge-transfer resistance (Rct) first decreases from 168.2 mΩ (x = 0) to 125.7 mΩ (x = 0.10), then increases to 136.6 mΩ (x = 0.15). All the results indicate that the substitution of Mg with a certain amount of Ca can improve the overall electrochemical characteristics.
KW - AB-type alloy
KW - Electrochemical kinetics
KW - Hydrogen storage
KW - MH/Ni battery
UR - http://www.scopus.com/inward/record.url?scp=79951581871&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2010.12.008
DO - 10.1016/j.ijhydene.2010.12.008
M3 - 文章
AN - SCOPUS:79951581871
SN - 0360-3199
VL - 36
SP - 3050
EP - 3055
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 4
ER -