首页|3D self-supported hierarchical lettuce-like Ni3S2 super architecture with an internal nanowire network for high-performance supercapacitors
3D self-supported hierarchical lettuce-like Ni3S2 super architecture with an internal nanowire network for high-performance supercapacitors
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NSTL
Elsevier
? 2022 Elsevier B.V.Tremendous efforts are devoted to the rational design of self-supported hierarchical architectures that are capable of delivering ultrahigh areal capacitance, and that are essential for miniaturized energy storage devices. Herein we propose a one-step-solvothermal approach for the hierarchical advancement in the morphology of the Ni3S2 on Ni foam from one-dimensional (1D) nanowires to a three-dimensional lettuce-like architecture with an internal nanowire network and corals at the edges. As the formation of this unique 3D lettuce-like architecture has resulted from the integration of 2D sheets with internal 1D nanowires, the combined features make it possible to realize ultra-high capacitance. This 3D architecture Ni3S2 electrode efficiently offers ultrahigh areal capacitance of 14.64 F cm?2, five times higher than that of nanowire arrays of 2.82 F cm?2 at the higher current density of 10 mA cm?2. A high value of 5.90 F cm?2 achieved, even at a larger current density of 50 mA cm?2, and retention of about 93% of the original capacitance over 7500 charge–discharge cycles when the applied current density is 150 mA cm?2, makes it a potential electrode material for large-scale energy storage devices with confined areas, like micro-supercapacitors. In addition, an as-fabricated asymmetric supercapacitor (ASC) exhibits areal capacitance of 597 mF cm?2, an energy density of 0.21 mWh cm?2, and a power density of 4.44 mW cm?2 at 10 mA cm?2, with high rate capability and capacitance retention of 79.5% over 10,000 cycles.
1D to 3D modulation3D lettuce-like architectureAsymmetric supercapacitorUltra-high areal capacitance
Mane S.M.、Teli A.M.、Shin J.C.
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Division of Electronics and Electrical Engineering Dongguk University-Seoul
NSTL
Elsevier
