Morphology and crystallinity-controlled synthesis of manganese cobalt oxide/manganese dioxides hierarchical nanostructures for high-performance supercapacitors

Abstract

We demonstrate a novel preparative strategy for the well-controlled MnCo2O4.5@MnO2 hierarchical nanostructures. Both δ-MnO2 nanosheets and α-MnO2 nanorods can uniformly decorate the surface of MnCo2O4.5 nanowires to form core–shell heterostructures. Detailed electrochemical characterization reveals that MnCo2O4.5@δ-MnO2 pattern exhibits not only high specific capacitance of 357.5 F g−1 at a scan rate of 0.5 A g−1, but also good cycle stability (97% capacitance retention after 1000 cycles at a scan rate of 5 A g−1), which make it have a promising application as a supercapacitor electrode material.