Electrochemical hydrogenation behavior of C15-type Zr(Mn,Ni)(2) alloy electrodes

Citation
Ys. Hsu et al., Electrochemical hydrogenation behavior of C15-type Zr(Mn,Ni)(2) alloy electrodes, J ALLOY COM, 313, 2000, pp. 263-268
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN journal
09258388 → ACNP
Volume
313
Year of publication
2000
Pages
263 - 268
Database
ISI
SICI code
0925-8388(200012)313:<263:EHBOCZ>2.0.ZU;2-E
Abstract
A series of Laves phase AB(2) metal hydride electrodes based on Zr(Mn,Ni), were studied. Partial substitution or addition with Ti,V, and Co was made, and most of the alloys maintained the C15-type structure. The alloy powders were coated with Ni by electroless plating for electrode application. The charge-discharge properties were examined and correlated with the gas-phase hydrogenation properties. Alloys with a large hydrogen desorption capacity , a small hysteresis, and a flat plateau pressure at around 0.1 MPa had bet ter electrochemical performance. During the cyclic charge-discharge test, m anganese was decomposed from the electrode, causing degradation of the elec trode. Overcharge caused faster degradation of the electrode. Based on the compositions studied, the composition ZrMn0.6V0.2Co0.1Ni1.2 is recommended as a good electrode material. Its discharge capacity at a discharge rate 50 mA/g was similar to 350 mAh/g. It also maintained excellent discharge capa cities when discharged at higher rates. (C) 2000 Elsevier Science B.V. All rights reserved.