TY - JOUR
T1 - Electrochemical hydrogenation and dehydrogenation mechanisms of the Ti-V base multiphase hydrogen storage electrode alloy
AU - Chen, Ni
AU - Li, Rui
AU - Zhu, Yunfeng
AU - Liu, Yongfeng
AU - Pan, Hongge
PY - 2004/11
Y1 - 2004/11
N2 - The electrochemical hydrogenation and dehydrogenation mechanisms of a multiphase Ti-V base alloy Ti0.8Zr0.2V1.867 Mn0.373Cr0.56Ni0.7 have been studied by XRD Rietveld analyses, based on the linear relationship between the volume expansion and charging capacity. The results show that the as-cast alloy is composed of a C14 Laves phase with hexagonal structure and a V base solid solution phase with bcc structure. During electrochemical charging, the unit cell volume expansion (ΔV/V) of the Laves phase is from 0.301% to 2.719% and for the bcc phase from 0.011% to 1.685% for the charging durations from 3.33 min to 120 min, respectively. During electrochemical discharging (ΔV/V) of the Laves phase decreases from 14.542% to 8.119% and for the bcc phase from 8.117% to 6.248% for the discharging durations from 0 min to 165 min, respectively. Therefore, during electrochemical charging, the Laves phase was hydrogenated from very beginning of the charging process. The bcc phase could obtain hydrogen only from its neighboring Laves phase. The electrochemical discharging mechanism is similar to that of charging. In conclusion, C14 Laves phase and V base solid solution phase are the hydrogen storage phases with high hydrogen storage capacities in the alloy Ti0.8Zr0.2V1.867 Mn0.373Cr0.56Ni0.7; C14 Laves phase also works as an electrochemical catalyst for the V base solid solution phase, which enhances the use of V base solid solution phase to make electrochemical properties of Ti-V base multiphase hydrogen storage electrode alloys preferable.
AB - The electrochemical hydrogenation and dehydrogenation mechanisms of a multiphase Ti-V base alloy Ti0.8Zr0.2V1.867 Mn0.373Cr0.56Ni0.7 have been studied by XRD Rietveld analyses, based on the linear relationship between the volume expansion and charging capacity. The results show that the as-cast alloy is composed of a C14 Laves phase with hexagonal structure and a V base solid solution phase with bcc structure. During electrochemical charging, the unit cell volume expansion (ΔV/V) of the Laves phase is from 0.301% to 2.719% and for the bcc phase from 0.011% to 1.685% for the charging durations from 3.33 min to 120 min, respectively. During electrochemical discharging (ΔV/V) of the Laves phase decreases from 14.542% to 8.119% and for the bcc phase from 8.117% to 6.248% for the discharging durations from 0 min to 165 min, respectively. Therefore, during electrochemical charging, the Laves phase was hydrogenated from very beginning of the charging process. The bcc phase could obtain hydrogen only from its neighboring Laves phase. The electrochemical discharging mechanism is similar to that of charging. In conclusion, C14 Laves phase and V base solid solution phase are the hydrogen storage phases with high hydrogen storage capacities in the alloy Ti0.8Zr0.2V1.867 Mn0.373Cr0.56Ni0.7; C14 Laves phase also works as an electrochemical catalyst for the V base solid solution phase, which enhances the use of V base solid solution phase to make electrochemical properties of Ti-V base multiphase hydrogen storage electrode alloys preferable.
KW - C14 Laves phase
KW - Electrochemical hydrogenation and dehydrogenation
KW - Electrochemical property
KW - Ti-V base hydrogen storage alloy
KW - V base solid solution
UR - http://www.scopus.com/inward/record.url?scp=12344263995&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:12344263995
SN - 0412-1961
VL - 40
SP - 1200
EP - 1204
JO - Jinshu Xuebao/Acta Metallurgica Sinica
JF - Jinshu Xuebao/Acta Metallurgica Sinica
IS - 11
ER -