<p>In this report, 2D hierarchical NiCo-LDH/rGO was fabricated for the purpose of super capacitors. The NiCoAl-LDH nanoplates were affix on the rGO nanosheets, forming a cross-linked core–shell structure. The morphological, textural and elemental composition of the samples was analysed through SEM, BET, XRD, Raman and XPS analysis. The NiCoAl-LDH/rGO composite exhibited the highest specific capacitance of 1916 ± 0.2 Fg<sup>−1</sup> at 1 Ag<sup>−1</sup> with an excellent cyclic stability of 90.5% over 10,000 charging and discharging cycles at 20 Ag<sup>−1</sup>. The asymmetric supercapacitor assembled with NiCoAl-LDH/rGO and AC electrodes exhibited a high specific capacitance of 182.5 ± 0.1 Fg<sup>−1</sup> at 1 Ag<sup>−1</sup> and superior energy density of 59.3 ± 0.2 Whkg<sup>−1</sup>. The increased conductivity of rGO makes it function faster electrochemically than pure NiCoAl-LDH. SCs&#xa0;may use these materials to hold and transform energy.</p>

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Hierarchical design of core–shell structured NiCoAl-LDH composites on rGO/Ni foam with enhanced electrochemical properties for asymmetric supercapacitor

  • Deepthi Joseph,
  • S. Sangeethapriya,
  • V. Subha,
  • Vivek Panyam Muralidharan

摘要

In this report, 2D hierarchical NiCo-LDH/rGO was fabricated for the purpose of super capacitors. The NiCoAl-LDH nanoplates were affix on the rGO nanosheets, forming a cross-linked core–shell structure. The morphological, textural and elemental composition of the samples was analysed through SEM, BET, XRD, Raman and XPS analysis. The NiCoAl-LDH/rGO composite exhibited the highest specific capacitance of 1916 ± 0.2 Fg−1 at 1 Ag−1 with an excellent cyclic stability of 90.5% over 10,000 charging and discharging cycles at 20 Ag−1. The asymmetric supercapacitor assembled with NiCoAl-LDH/rGO and AC electrodes exhibited a high specific capacitance of 182.5 ± 0.1 Fg−1 at 1 Ag−1 and superior energy density of 59.3 ± 0.2 Whkg−1. The increased conductivity of rGO makes it function faster electrochemically than pure NiCoAl-LDH. SCs may use these materials to hold and transform energy.