首页|Fabrication of hierarchical NiCo2S4 nanotubes@NiMn-LDH nanosheets core-shell hybrid arrays on Ni foam for high-performance asymmetric supercapacitors
Fabrication of hierarchical NiCo2S4 nanotubes@NiMn-LDH nanosheets core-shell hybrid arrays on Ni foam for high-performance asymmetric supercapacitors
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NSTL
Elsevier
The present study successfully synthesized NiCo2S4 nanotubes@NiMn-LDH nanosheets core-shell hybrid structure on Ni foam through a controllable three-step facile hydrothermal method, the NiMn-layered double hydroxides (LDHs) nanosheets with unlike thicknesses adhere to the outer layer of NiCo2S4 nanotubes by adjusting the heating time of hydrothermal reaction. The optimized NiCo2S4@NiMn-LDH electrode was able to transmit a high specific capacity of 822.64 C g?1 (4.36 C cm?2) at a high current density of 50 mA cm?2, and maintained 92.7% of its initial specific capacity after 5000 cycles at a current density of 50 mA cm?2 when 2 M KOH was used as the electrolyte. Furthermore, an asymmetric supercapacitor (ASC) device fabricated with NiCo2S4@NiMn-LDH as the positive electrode and activated carbon (AC) as the negative electrode, and it achieved a maximal energy density of 53.10 W h kg?1 at a power density of 370.82 W kg?1 also maintained 94.3% retention of the initial specific capacitance after 10,000 cycles at a high current density of 20 mA cm?2. With the excellent electrochemical properties, the as-prepared core-shell structured NiCo2S4@NiMn-LDH hybrid arrays have extraordinary application potential in the energy storage field.
Xue Y.、Liu X.、Han L.、Xie Z.、Liu L.、Li Y.、Zhao X.、Hua Y.、Wang C.
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State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University
Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province School of Chemistry and Chemical Engineering Hainan Normal University
NSTL
Elsevier
