One-step synthesis of hierarchical ZnCo2O4@ZnCo2O4 core–shell nanosheet arrays on nickel foam for electrochemical capacitors

Abstract

An integrated electrode of hierarchical ZnCo₂O₄@ZnCo₂O₄ core–shell nanosheet arrays/nickel foam has been successfully synthesized, via a one-step hydrothermal method followed by calcination treatment. The hierarchical ZnCo₂O₄@ZnCo₂O₄ nanosheet arrays seem to possess mesoporous characteristics with ultrathin thickness. Due to its novel, hybrid nanoarchitecture, such an electrode system has exhibited remarkable areal specific capacitance along with excellent cycling life, even under fairly high current density conditions.