Layered cobalt carbonate hydroxide (LCCH) acicular nanorod arrays (ANRAs) are converted to Co 3 O 4 acicular nanotube arrays (ANTAs) via Kirkendall effect. The Co 3 O 4 ANTAs exhibit a specific capacitance of 979 F g −1 , which is higher than that of the Co 3 O 4 ANRAs (191 F g −1 ).
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Kung et al. (2015) studied this question.
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