Studies of electrochemical properties of Ti{sub 0.35}Zr{sub 0.65}Ni{sub x}V{sub 2{minus}x{minus}y}Mn{sub y} alloys with C14 Laves phase for nickel/metal hydride batteries

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1836461· OSTI ID:212151

Yang, H W; Wang, Y Y; Wan, C C ^[1]

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1. National Tsing-Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Chemical Engineering

Electrochemical properties of Ti{sub 0.35}Zr{sub 0.65}Ni{sub x}V{sub 2{minus}x{minus}y}Mn{sub y} alloys used as metal hydride electrode material have been investigated. In the cathodic charging process, alloy B (Ti{sub 0.35}Zr{sub .65}Ni{sub 1.0}V{sub 0.6}Mn{sub 0.4}) has the largest reduction current followed by alloy C (Ti{sub 0.35}Zr{sub 0.65}Ni{sub 1.2}V{sub 0.6}Mn{sub 0.2}) and alloy D (Ti{sub 0.35}Zr{sub 0.65}Ni{sub 1.2}V{sub 0.4}Mn{sub 0.4}). On the other hand, hydrogen evolution reaction occurs when the electrode potentials of alloy B to D reach {minus}0.946, {minus}0.941, and {minus}0.932 V vs. Hg/HgO, respectively. In the anodic process, the discharge capacities were measured. The activation overpotential and concentration overpotential of electrode can be separately calculated from the anodic polarization data. At low discharge current density, the charge-transfer process is the dominant electrode reaction, whereas at high discharge current density, hydrogen diffusion within the bulk of alloy is the rate-determining step. Finally, some electrochemical parameters concerning the electrode kinetics of hydrogen-absorbing alloy such as exchange current density, limiting current density, and transfer coefficient are estimated.

• Sponsoring Organization: USDOE
• OSTI ID: 212151
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 143; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
40 CHEMISTRY
CHEMICAL COMPOSITION
ELECTROCHEMISTRY
ELECTRODES
HYDROGEN
HYDROGEN STORAGE
LAVES PHASES
MANGANESE ALLOYS
MASS TRANSFER
NICKEL ALLOYS
NICKEL-HYDROGEN BATTERIES
REDOX REACTIONS
TITANIUM ALLOYS
VANADIUM ALLOYS
ZIRCONIUM ALLOYS