Electrochemical investigations on cobalt-microencapsulated MmNi2.38Al0.82Co0.66Si0.77Fe0.13Mn0.24 hydrogen storage alloys for Ni–MH batteries
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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| Title |
Electrochemical investigations on cobalt-microencapsulated
MmNi2.38Al0.82Co0.66Si0.77Fe0.13Mn0.24 hydrogen storage
alloys for Ni–MH batteries
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| Creator |
Manimaran, K.
Ananth, M.V. Raju, M. Renganathan, N.G. Ganesan, M. |
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| Subject |
Electrochemical Power Sources
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| Description |
Cobalt coatings were applied over lanthanum process-rich MmNi2.38Al0.82Co0.66Si0.77-
Fe0.13Mn0.24 alloy particles by an autocatalytic electroless deposition process. Electrode
characteristics such as electrochemical capacity and cycle life were studied for the
uncoated and coated alloys. The structure and morphology of the surface modified
samples were characterized with XRD and SEM/EDAX techniques. The cobalt coating forms
a thin layer on the surface of the core material and the coated alloys exhibit a 15%
improvement in performance over the bare alloy. A comparison of the electrochemical
impedance behaviour of the bare and cobalt-coated metal hydride electrodes at different
states-of-charge reveals that the relaxation period is distinct for different SOCs. The cobalt
microencapsulations influence the apparent activation energy of the dehydriding process.
The calculated equivalent rate constant (keq) values confirm the improvement in reversibility
for the cobalt-coated alloy as compared to the bare alloy.
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| Publisher |
Elsevier Ltd.
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| Date |
2010
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/263/1/2010-045.pdf
Manimaran, K. and Ananth, M.V. and Raju, M. and Renganathan, N.G. and Ganesan, M. (2010) Electrochemical investigations on cobalt-microencapsulated MmNi2.38Al0.82Co0.66Si0.77Fe0.13Mn0.24 hydrogen storage alloys for Ni–MH batteries. International Journal of Hydrogen Energy , 35. 4 6 3 0 -4 6 3 7. ISSN 0360-3199 |
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| Relation |
http://cecri.csircentral.net/263/
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