ZnNi<sub>2</sub>O<sub>4</sub>/WS<sub>2</sub> Nanoflake-Based Electrodes for Quasi-Solid-State Asymmetric Supercapacitors

ZnNi<sub>2</sub>O<sub>4</sub>/WS<sub>2</sub> Nanoflake-Based Electrodes for Quasi-Solid-State Asymmetric Supercapacitors

The spinel compounds are a class of intriguing electrode materials for redox-based supercapacitors owing to their high specific capacity and variable redox sites, but they are constrained by cyclic instability and an inadequate rate capability. The integration of suitable two-dimensional (2D) electr...

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Bibliographic Details
Main Author: Monika Sharma (421673) (author)
Other Authors: M. Pershaanaa (19833344) (author), Anil Kumar Singh (7551270) (author), Ramesh Kasi (7164059) (author), Ramesh T. Subramaniam (7164062) (author), Pritam Deb (3662488) (author)
Published: 2024
Subjects:
Medicine
Neuroscience
Physiology
Biotechnology
Evolutionary Biology
Space Science
Chemical Sciences not elsewhere classified
state asymmetric supercapacitors
inadequate rate capability
impressive capacitance retention
high specific capacity
fully operational clock
effective charge transfer
demonstrated synergistic coupling
allowing effective dispersion
ab initio calculations
7 ± 0
2 ± 0
significant electrochemical properties
based supercapacitors owing
6 w h
5 ± 0
4 w h
variable redox sites
redox active sites
4 </ sub
2 </ sub
intriguing electrode materials
2 w
5 w
electrode materials
significant potential
based electrodes
electrode nanomaterials
supportive matrix
suitable two
storage applications
spinel compounds
power density
illuminate different
hybrid nanostructure
fabricated devices
energy density
cyclic instability
coulombic efficiency
colored leds
also introduces
8 f
3 f
03 %).
03 %),
004 %)
000 cycles
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Summary:The spinel compounds are a class of intriguing electrode materials for redox-based supercapacitors owing to their high specific capacity and variable redox sites, but they are constrained by cyclic instability and an inadequate rate capability. The integration of suitable two-dimensional (2D) electrode nanomaterials with spinel compounds not only facilitates an effective charge transfer but also introduces more redox active sites, presenting significant electrochemical performance. Herein, a 0D/2D ZnNi<sub>2</sub>O<sub>4</sub>/WS<sub>2</sub> (WZNO) hybrid nanostructure has been developed where WS<sub>2</sub> nanoflakes (WNFS) act as a supportive matrix, allowing effective dispersion of ZnNi<sub>2</sub>O<sub>4</sub> nanoparticles (ZNO) over its surface and thereby exposing numerous electrochemically active sites. The developed flexible electrode shows remarkable faradaic redox phenomena, exhibiting significant specific capacitance (184.8 F/g), impressive cyclic stability (38.5 ± 0.03%), and coulombic efficiency (94.7 ± 0.004%) up to 10,000 cycles. The ab initio calculations have demonstrated synergistic coupling between the constituents of the metallic ZnNi<sub>2</sub>O<sub>4</sub>/WS<sub>2</sub> hybrid nanostructure, via interfacial charge transport, elucidating its significant electrochemical properties. The asymmetric supercapacitor exhibits superior specific capacitance (171.3 F/g), showcasing remarkable energy (61.6 W h/kg) and power density (1236.5 W/kg). Conversely, the quasi-solid-state supercapacitor demonstrates significant power (20.4 W h/kg) and energy density (921.2 W/kg) with impressive capacitance retention (97.2 ± 0.03%). The fabricated devices can illuminate different-colored LEDs, along with a fully operational clock and calculator, highlighting their significant potential as electrode materials in storage applications.

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