Ultrathin 2D Sheets of Graphene and WS2 for Energy Storage Applications

Sufyan Naseer, Adeel Riaz, Ramsha Khan, Khalid Mansoor, Qaisar Abbas, Sofia Javed, M. Aftab Akram, Rahim Jan

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Ultrathin 2D-nanomaterials are currently being exploited and employed for energy storage applications. Graphene nanosheets (GNS) are the most favorable candidate for energy storage and charge transfer due to its extraordinary novel properties. Other than graphene, various 2D materials like transition metal dichalcogenides (TMDs) are used in charge storage applications too. In this article, ultrathin 2D sheets of various 2D materials like graphene and TMDs like WS2 were being prepared by liquid phase exfoliation method. The exfoliated 2D sheets were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectrometer, and atomic force microscopy (AFM). SEM and AFM being used to determine the morphology and dimensional aspects of prepared exfoliated sheets, respectively. The exfoliated sheets were coated over PET membranes in single layer and layer by layer assembly for evaluating their supercapacitance, respectively. The prepared films were tested with galvanostatic charge-discharge cycles and cyclic voltammetry (CV) in 1 M Na2SO4 as electrolyte. Results obtained from layer by layer assembly of WS2-GNS showed a high efficiency of 96% charge retention after 1000 cycles. The WS2/GNS multilayer films can exhibit a high value of specific capacitance about 800 F kg(-1) and area calculated for this capacitance was 70 F m(-2) under 10 mVs(-1) scan rate. And the film exhibits good cycle stability over 1000 cycles. The results suggest that the WS2-GNS layer by layer assembly is quite suitable as well as favorable electrode materials for high performance energy storage devices like supercapacitors.

Original languageEnglish
Title of host publicationProceedings of 2019 16th International Bhurban Conference on Applied Sciences and Technology, IBCAST 2019
Number of pages6
ISBN (Electronic)978-1-5386-7729-2
Publication statusPublished - 2019
Externally publishedYes
Publication typeA4 Article in conference proceedings
Event16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) - Islamabad, Pakistan
Duration: 8 Jan 201912 Jan 2019

Publication series

NameInternational Bhurban Conference on Applied Sciences and Technology
ISSN (Print)2151-1403
ISSN (Electronic)2151-1411


Conference16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)


  • 2D materials
  • Transition metal dichalcogenides (TMDs)
  • Supercapacitor
  • Liquid phase exfoliation
  • Atomic force microscopy


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