| الملخص: | Herein, we present an interfacial engineering strategy to construct an efficient hydrothermal approach by in situ growing cobalt-doped@MnO<sub>2</sub> nanocomposite on highly conductive nickel foam (Ni foam) for supercapacitors (SCs). The remarkably high specific surface area of Co dopant provides a larger contacting area for MnO<sub>2</sub>. In the meantime, the excellent retentions of the hierarchical phase-based pore architecture of the cobalt-doped surface could beneficially condense the electron transportation pathways. In addition, the nickel foam (Ni foam) nanosheets provide charge-transport channels that lead to the outstanding improved electrochemical activities of cobalt-doped@MnO<sub>2</sub>. The unique cobalt-doped@MnO<sub>2</sub> nanocomposite electrode facilitates stable electrochemical architecture, multi-active electrochemical sites, and rapid electro-transports channels; which act as a key factor in enhancing the specific capacitances, stability, and rate capacities. As a result, the cobalt-doped@MnO<sub>2</sub> nanocomposite electrode delivered superior electrochemical activities with a specific capacitance of 337.8 F g<sup>–1</sup> at 0.5 A g<sup>–1</sup>; this is greater than pristine MnO<sub>2</sub> (277.9 F g<sup>–1</sup>). The results demonstrate a worthy approach for the designing of high-performance SCs by the grouping of the nanostructured dopant material and metal oxides.
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