Rational
designing advanced materials with multicomponents and
multiscale nanostructures is an important pathway to promote the rapid
development and practical application of high-performance supercapacitors.
Herein, FeCo2S4@Ni@graphene nanocomposites are
prepared through electroless depositionhydrothermal two-step
method. In this hybrid structure, the metal nickel as a conductive
bridge significantly enhances the charge transport and the structural
stability between FeCo2S4 and graphene by encouraging
the heterogeneous nucleation of FeCo2S4 on the
active Ni@graphene. More importantly, the rich defects are induced
into FeCo2S4@Ni@graphene by the interface engineering
due to the lattice mismatch at the interface between Ni and FeCo2S4 and partial substitution of Ni for Co or Fe.
These defects can provide additional faradic redox reactions and abundant
active sites. Benefiting from the synergies of above advantages, the
optimized FeCo2S4@Ni@graphene shows a specific
capacity of 390.0 mAh g–1 at 1 A g–1. Additionally, the asymmetric supercapacitor based on FeCo2S4@Ni@graphene delivers a high energy density of 65.8
Wh kg–1 at 849 W kg–1, as well
as capacitance retention of 89.2% after 6000 cycles at 20 A g–1. This work proposes an effective strategy, which
is to regulate the defects in transition-metal compounds through heterointerface
engineering to prepare advanced energy-storage materials.
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