Abstract
RuO 2 /MnO 2 NRs as an electrode for supercapacitors show a high electrochemical performance with a specific capacitance of 793 F g -1 (based on MnO 2 ) by cyclic voltammetry (CV) at a scan rate of 2 mV s -1 in 1 M Na 2 SO 4 aqueous solution. A good rate capability with a specific capacitance of 556 F g -1 at a current density of 1 A g -1 and a good cycling stability (20% degradation after 1000 cycles) were also achieved. The enhancement of capacitive behavior can be attributed to the conductive RuO 2 template with a series resistance of 0.75 Ω and a charge transfer resistance of 0.75 Ω. The results show that an active material such as a MnO 2 hybrid with highly conductive 1D nanowires may greatly improve the electrochemical performance for supercapacitors. © 2013 The Royal Society of Chemistry.