Layered double hydroxides (LDHs) have come to the foreground
recently,
considering their unique layered structure and short ion channels
when they act as electrode materials for supercapacitors (SCs). However,
due to their poor rate and cycle performance, they are not highly
sought after in the market. Therefore, a flower-like hierarchical
NiCo-LDH@C nanostructure with flake NiCo-LDH anchored on the carbon
skeleton has emerged here, which is constructed by calcination and
hydrothermal reaction and applying flake ZIF-67 as a precursor. In
this structure, NiCo-LDH grows outward with abundant and homogeneously
distributed Co nanoparticles on Co@C as nucleation sites, forming
a hierarchical structure that is combined tightly with the carbon
skeleton. The flower-like hierarchical nanostructures formed by the
composite of metal–organic frameworks (MOFs) and LDHs have
successfully enhanced the cycle and rate performance of LDH materials
on the strength of strong structural stability, large specific surface
area, and unique cooperative effect. The NiCo-LDH@C electrode displays
superb electrochemical performance, with a specific capacitance of
2210.6 F g–1 at 1 A g–1 and 88.8%
capacitance retention at 10 A g–1. Furthermore,
the asymmetric supercapacitor (ASC) constructed with NiCo-LDH@C//RGO
reveals a remarkable energy density of 45.02 W h kg–1 with a power density of 799.96 W kg–1. This project
aims to propose a novel avenue to exploit NiCo-LDH electrode materials
and provide theory and methodological guidance for deriving complex
structures from MOF derivatives.
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