Electrochemical properties of over-stoichiometric ZrMn{sub 1{minus}x}V{sub x}Ni{sub 1.4+y} alloys with C15 Laves phase

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1838218· OSTI ID:599653

Kim, D M; Lee, S M; Jung, J H; Jang, K J; Lee, J Y ^[1]

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1. Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering

The hydrogen storage performance and electrochemical properties of ZrMn{sub 1{minus}x}V{sub x}Ni{sub 1.4+y} (x = 0.5, 0.7; y = 0.0, 0.2, 0.4, and 0.6) alloys, one type with a high amount of manganese, i.e., x = 0.5, and the other with a small amount of manganese, i.e., x = 0.7, were investigated. The relationship between discharge performance and alloy characteristics such as crystallographic parameters, surface morphology, reaction surface area, and exchange current density is also discussed. All of these alloys were found to have mainly a C15-type Laves phase structure by x-ray diffraction analysis. The equilibrium hydrogen pressure of the alloy increased as the amount of Ni increased in both types of alloys. In the case of ZrMn{sub 0.5}V{sub 0.5}Ni{sub 1.4+y} (y = 0.0, 0.2, 0.4, and 0.6) alloys, the discharge efficiency and the rate capability decreased as the amount of Ni increased, while these values increased for the ZrMn{sub 0.3}V{sub 0.7}Ni{sub 1.4+y} (y = 0.0, 0.2, 0.4, and 0.6) alloys. After measuring the specific reaction surface area and exchange current density to identify the reason why the electrode properties had a reverse tendency between the two systems, the authors confirmed that for the ZrMn{sub 0.5}V{sub 0.5}Ni{sub 1.4+y} (y = 0.0, 0.2, 0.4, and 0.6) alloys the major factor controlling the electrode properties was the specific reaction surface area, not the exchange current density, while, in the case of ZrMn{sub 0.3}V{sub 0.7}Ni{sub 1.4+y} (y = 0.0, 0.2, 0.4, and 0.6) alloys, mainly the exchange current density, not the specific reaction surface area, controlled the electrode properties.

• Sponsoring Organization: USDOE
• OSTI ID: 599653
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 1 Vol. 145; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
25 ENERGY STORAGE
36 MATERIALS SCIENCE
ELECTRICAL PROPERTIES
HYDROGEN STORAGE
LAVES PHASES
MANGANESE ALLOYS
NICKEL ALLOYS
NICKEL-HYDROGEN BATTERIES
PHYSICAL PROPERTIES
VANADIUM ALLOYS
ZIRCONIUM ALLOYS