Layered cobalt carbonate hydroxide (LCCH) acicular nanorod arrays (ANRAs) grown on a graphite substrate are converted to Co3O4 acicular nanotube arrays (ANTAs) via the anion-exchange reaction and Kirkendall effect at low temperature. The Co3O4 ANTAs exhibit an area capacitance of 369 mF cm-2 and a specific capacitance of 979 F g-1 at 2.5 mA cm-2, which are much higher than those of the Co3O4 ANRAs prepared by calcining the LCCH ANRAs at 350 °C (64.5 mF cm-2 and 191 F g-1).
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)