Novel topotactically transformed carbon-CoO-NiO-NiCo sub(2)O sub(4) nanosheet hybrid hetero-structured arrays as ultrahigh performance supercapacitors

A novel carbon-CoO-NiO-NiCo sub(2)O sub(4) integrated electrode has been designed by reducing the hetero-structured NiCo sub(2)O sub(4) nanosheet array with C sub(2)H sub(2) on the nickel foam at a low temperature of 350 degree C. The topotactical transformation from NiCo sub(2)O sub(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.