A porous cobalt nanorods (Co-NRs) structure is successfully synthesized via annealing of Co(OH)2 nanorods at 350 °C with the presence of ethanol glycol (EG). The [email protected] foam electrode displayed an ultrahigh specific capacitance of 3142.8 F g−1 at a current density of 1 mA cm−2; high-rate capability behavior can be proved by 87% of initial capacitance maintenance at 20 mA cm−2 and an excellent cycling life with a retention of 124.5% after 20,000 galvanostatic charge−discharge (GCD) cycles. The excellent electrochemical behavior o...
