Electrochemical hydrogenation behavior of C15-type Zr(Mn,Ni) sub 2 alloy electrodes
A series of Laves phase AB sub 2 metal hydride electrodes based on Zr(Mn,Ni) sub 2 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 applicati...
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| Published in: | Journal of alloys and compounds Vol. 313; no. 1-2; pp. 263 - 268 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
15-12-2000
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| Online Access: | Get full text |
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| Summary: | A series of Laves phase AB sub 2 metal hydride electrodes based on Zr(Mn,Ni) sub 2 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 better electrochemical performance. During the cyclic charge-discharge test, manganese was decomposed from the electrode, causing degradation of the electrode. Overcharge caused faster degradation of the electrode. Based on the compositions studied, the composition ZrMn sub 0.6 V sub 0.2 Co sub 0.1 Ni sub 1.2 is recommended as a good electrode material. Its discharge capacity at a discharge rate 50 mA/g was approx =350 mAh/g. It also maintained excellent discharge capacities when discharged at higher rates. |
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| Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-1 |
| ISSN: | 0925-8388 |