Novel topotactically transformed carbon–CoO–NiO–NiCo2O4 nanosheet hybrid hetero-structured arrays as ultrahigh performance supercapacitors

Abstract

A novel carbon–CoO–NiO–NiCo₂O₄ integrated electrode has been designed by reducing the hetero-structured NiCo₂O₄ nanosheet array with C₂H₂ on the nickel foam at a low temperature of 350 °C. The topotactical transformation from NiCo₂O₄ 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.