Epitaxial nanostructure derived robust energy storage performance in symmetric and asymmetric ultracapacitors
POSTER
Abstract
Epitaxial nanostructure derived robust energy storage performance in symmetric and asymmetric ultracapacitors
Monika Sharma, and Pritam Deb*
Advanced Functional Material Laboratory (AFML), Department of Physics, Tezpur University (Central University), Tezpur 784028, India.
*E-mail: pdeb@tezu.ernet.in
Tungsten disulphides are kind of intriguing electrode materials for supercapacitors, however due to their propensity for agglomeration and substantial volume variations during repetitive charged-discharge cycles; they are indeed constrained by cyclic instability and poor energy storage performances. In this study, nanoflakes-on-nanosheets WS2/N doped reduced graphene oxide (N-rGO) epitaxial nanostructure were developed wherein intertwined N-rGO nanosheets serve as supports and effectively spread WS2 nanoflakes over the N-rGO surface, supplying a large number of electroactive sites. Significantly, the C−O−W bonds that connect the flakes and sheet together form a highly coupled interface that efficiently facilitates interface charge transport and mechanically strengthens it to withstand volume variations. In the current study, supercapacitors based on WS2/N-rGO electrode exhibit very high specific capacitance, cyclability, and distinctive structural modifications throughout electrochemical cycling, demonstrating the electrode's significant potential for energy storage. It has a remarkable specific and cyclic stability for symmetric supercapacitor. The asymmetric supercapacitor exhibits higher specific capacitance, maximum energy density and power density. The research should pave the way for the investigation of further TMDs-based electrode materials in the near future for the construction of improved energy storage devices.
Monika Sharma, and Pritam Deb*
Advanced Functional Material Laboratory (AFML), Department of Physics, Tezpur University (Central University), Tezpur 784028, India.
*E-mail: pdeb@tezu.ernet.in
Tungsten disulphides are kind of intriguing electrode materials for supercapacitors, however due to their propensity for agglomeration and substantial volume variations during repetitive charged-discharge cycles; they are indeed constrained by cyclic instability and poor energy storage performances. In this study, nanoflakes-on-nanosheets WS2/N doped reduced graphene oxide (N-rGO) epitaxial nanostructure were developed wherein intertwined N-rGO nanosheets serve as supports and effectively spread WS2 nanoflakes over the N-rGO surface, supplying a large number of electroactive sites. Significantly, the C−O−W bonds that connect the flakes and sheet together form a highly coupled interface that efficiently facilitates interface charge transport and mechanically strengthens it to withstand volume variations. In the current study, supercapacitors based on WS2/N-rGO electrode exhibit very high specific capacitance, cyclability, and distinctive structural modifications throughout electrochemical cycling, demonstrating the electrode's significant potential for energy storage. It has a remarkable specific and cyclic stability for symmetric supercapacitor. The asymmetric supercapacitor exhibits higher specific capacitance, maximum energy density and power density. The research should pave the way for the investigation of further TMDs-based electrode materials in the near future for the construction of improved energy storage devices.
* MS would like to acknowledge SAIC, Tezpur University for characterization analyses. MS would like to acknowledge Department of Science and Technology (DST), Govt. of India for providing INSPIRE Fellowship (IF190778). The authors would like to acknowledge CSIR-NEIST, Jorhat for providing the facility of XPS. PD would like to acknowledge DST FIST.
Publication: M. Sharma, N. Hussain, S. Mohanty, P. Puzari, P. Deb, J. Energy Storage 2023, 72, 108345.
Presenters
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Monika Sharma
Tezpur University
Authors
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Monika Sharma
Tezpur University