4·H 2O@MnO 2 core-shell nanosheet arrays on nickel foam as an advanced electrode for asymmetric supercapacitors]]>

摘要

Graphical abstractDisplay OmittedHighlights?Hierarchical MnMoO4·H2O@MnO2core-shell nanosheet arrays are fabricated.?The specific capacitance is 3560.2?F?g?1for supercapacitor electrodes.?The energy density is 45.6?Wh?kg?1at a power density of 507.3?W?kg?1.AbstractThe hierarchical MnMoO4·H2O@MnO2core-shell nanosheet arrays on nickel foam have been successfully fabricated by a mild two-step hydrothermal method. MnMoO4·H2O nanosheet arrays is synthesized by adding sodium molybdates solution into the manganese chloride solution containing a nickel foam, and followed by the first step hydrothermal treatment. The MnMoO4·H2O@MnO2is fabricated by the second step hydrothermal treatment of above-step product in potassium permanganate solution. The core-shell nanosheet structure significantly increases the amount of active sites for redox reactions, shortens the diffusion pathway for ions, and facilitates the effective penetration of the electrolytes for energy storage application. The MnMoO4·H2O@MnO2as electrode material reaches to a high specific capacitance of 3560.2?F?g?1at a current density 1?A?g?1, as well as advantageous cycling stability (84.1% capacitance retention after 10,000 cycles). Furthermore, an asymmetric supercapacitor is also assembled, exhibiting an energy density of 45.6?Wh?kg?1at a power density of 507.3?W?kg?1. The MnMoO4·H2O@MnO2is a promising electrode material for supercapacitors.]]>