Abstract
Cyclic voltammograms of nanostructured nickel hydroxide modified platinum disk electrodes were interpreted as combinations of the contribution of alpha and beta-phase materials in different proportions. The electrolyte cation influenced more significantly the cathodic wave profile, where KOH seems to decrease the discharge rate more than NaOH and LiOH. Unexpectedly, the heat treatment does not seem to be required to get stabilized alpha-Ni(OH)2. Reproducible charge–discharge responses and up to 2.45 times higher specific charge capacity (490 mA h g−1) were registered for nanostructured α-NiII(OH)2 after 100 charge–discharge cycles, suggesting that they are stable enough for application in electrochemical devices such as batteries and sensors.
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Acknowledgments
Financial support from the Brazilian agencies Capes, CNPq (PNPD 1456/2013), FINEP, and Fundação Araucária (Pronex-116-2010/17378) was greatly appreciated. The authors also wish to thank the Brazilian Synchrotron Light Laboratory (LNLS) for the use of the XRD-1 line and the Brazilian National Nanotechnology Laboratory (LNNano) for the SEM images. M. Danczuk and C.V. Nunes Jr. also would like to express their gratitude to the DS/Capes agency for the Ph.D. scholarship.
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Danczuk, M., Nunes, C.V., Araki, K. et al. Influence of alkaline cation on the electrochemical behavior of stabilized alpha-Ni(OH)2 . J Solid State Electrochem 18, 2279–2287 (2014). https://doi.org/10.1007/s10008-014-2478-z
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DOI: https://doi.org/10.1007/s10008-014-2478-z