Novel topotactically transformed carbon-CoO-NiO-NiCo2O4 nanosheet hybrid hetero-structured arrays as ultrahigh performance supercapacitorsElectronic supplementary information (ESI) available. See DOI: 10.1039/c4cc01965b

A novel carbon-CoO-NiO-NiCo 2 O 4 integrated electrode has been designed by reducing the hetero-structured NiCo 2 O 4 nanosheet array with C 2 H 2 on the nickel foam at a low temperature of 350 °C. The topotactical transformation from NiCo 2 O 4 to the integrated electrode has been first conceived and investigated. Such unique nanoarchitectures exhibit excellent electrochemical performance with ultrahigh capacitance and desirable cycle life at high rates. A novel carbon-CoO-NiO-NiCo 2 O 4 integrated electrode was designed and synthesized from NiCo 2 O 4 in a topotactical transformation. Such unique nanoarchitectures exhibit excellent electrochemical performance with ultrahigh capacitance.