Hierarchical Ni(OH)2‐MnO2 Array as Supercapacitor Electrode with High Capacity.

Nanoarray electrodes with highly capacitive materials and specific architectures are hopeful to realize advanced supercapacitor performance. The nickel foam (NF) supported hierarchical nanosheet array electrode is fabricated through a template route toward excellent capacitive supercapacitor. The hierarchical nanosheet array weaved with Ni(OH)2‐MnO2 nanowires provides multiple advantages for porous feature, high surface area, and fast charge transfer. The neighbored Ni(OH)2‐MnO2 supplies lattice fringes distortion as additional active sites as well as synergism, for improved capacitive performances. As expected, the Ni(OH)2‐MnO2/NF electrode manifests high specific capacitance of 14.7 F cm−2 at 2.5 mA cm−2 and good cyclic stability, making it hopeful for highly capacitive supercapacitor application. Hierarchical nanosheet array weaved by Ni(OH)2‐MnO2 nanowires is fabricated on nickel foam as integrated electrode for high‐capacity supercapacitor. The excellent performances are assigned to the structure benefits of hierarchical nanosheets, including high surface area, lattice fringes distortion, and shortened charge diffusion, as well as synergism between neighbored crystals hybridization. [ABSTRACT FROM AUTHOR]