Core-Shell MnO2 Nanotubes@Nickel-Cobalt-Zinc Hydroxide Nanosheets for Supercapacitive Energy Storage
2020
With an increasing
requirement for clean, efficient, and sustainable
energy-storage devices, exploiting stable and high-performance electrode
materials attracted the strong interests of researchers. Herein, hierarchical
core–shell MnO2 nanotubes@nickel–cobalt–zinc
hydroxide (NiCoZn-OH) nanosheets are fabricated via employment of
the metal–organic framework (MOF)-template route. Such hollow
MnO2 nanotubes exist in internal core area, and the outer
ultrathin NiCoZn-OH nanosheets are mechanically supported, thus constructing
open, porous, and robust electrode architecture. The emphasis of our
research focuses on the ingredient optimization and morphology regulation
of electrode materials, thereby significantly depressing the agglomeration
of electrode and meliorating the exposed active sites. Therefore,
such MnO2@NiCoZn-OH electrode is featured with superior
capacitance performance (1569.1 F g–1 at 1 A g–1) and high rate performance (54% retention at 30 A
g–1). Moreover, an asymmetric supercapacitor (ASC)
is fabricated. The ASC device presents superior capacitance of 130.7
F g–1 at 1 A g–1, high energy
density (49.4 Wh kg–1 at 842.7 W kg–1), and excellent capacitance retention of 91.3% retention after 10 000
cycles. In general, a supercapacitive electrode with superior electrochemical
performance is gained, which guides us to boosting supercapacitive
performance via a structure regulation route.
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