The
rational design and synthesis of multicomponent core@shell
structures with fine morphology is a promising approach to develop
electrode materials for advanced supercapacitors. In this study, Zn-Ni
LDH@NiMoS
x
nanosheets with a hierarchical
heterostructure are grown in situ on nickel foam through the hydrothermal
routes, for the potential use as an integrated positive electrode
material. The Zn-Ni LDH@NiMoS
x
shows a
unique morphology and mesoporous feature with excellent synergistic
effects between individual components. Compared to the single components
of Zn-Ni LDH and NiMoS
x
, the Zn-Ni LDH@NiMoS
x
nanosheet arrays show better specific capacity
(357.88 mA h g–1 at a current of 5 mA cm–2) and rate performance. Meanwhile, ZIF-8 derived 3D nanoporous N-doped
carbon (ZPNC) material is used as an negative electrode material with
high surface area (918.3 m2 g–1), excellent
capacity (52.42 mA h g–1 at 2 mA cm–2), and rate performance (∼55% at 50 mA cm–2). The asymmetric supercapacitor device based on Zn-Ni LDH@NiMoS
x
and ZPNC electrodes exhibits a specific
capacity of 73.18 mA h g–1 at 3.5 mA cm–2 and an excellent cycle lifespan of 90% after 6000 cycles. The device
also demonstrates excellent energy density (58.54 W h kg–1) and very high power density (7397.34 W kg–1).
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