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Facile synthesis of nanowire and rectangular flakes of Co3O4 onto Ni foam for high-performance asymmetric supercapacitors

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Abstract

In this study, Co3O4 with different morphologies (nanowires of single phase, nanowires, and rectangular flakes of both phases) for supercapacitor electrode were synthesized through a hydrothermal approach in the presence of Triton X-100 followed by annealing at 350 °C for 1 h. The different morphologies of the samples were obtained with the assistance of surfactant by adjusting the quantity of reactants. Relative to Co3O4 nanowire (Co3O4 NW) samples, the Co3O4 nanowire-flake (Co3O4 NW-F) samples exhibit excellent electrochemical performance with higher capacity of 1230.65 F g−1 at a current density of 1 A g−1, and with regard to cycling stability, they perform well in a three-electrode system during the larger specific surface area. Moreover, an asymmetric supercapacitor was assembled with Co3O4 NW-F as positive electrode and activated carbon as negative electrode; the device shows a high energy density of 61.60 W h kg−1 at a power density of 1440 W kg−1.

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Funding

This work was supported by Department of Education, Heilongjiang Province (135109203) and College students’ innovation and training program (201810232090).

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Correspondence to Jun Wang.

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Wang, X., Song, K., Yang, R. et al. Facile synthesis of nanowire and rectangular flakes of Co3O4 onto Ni foam for high-performance asymmetric supercapacitors. Ionics 25, 3875–3883 (2019). https://doi.org/10.1007/s11581-019-02943-4

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