Applied Nanoscience

, Volume 8, Issue 3, pp 379–393 | Cite as

Sequential entrapping of Li and S in a conductivity cage of N-doped reduced graphene oxide supercapacitor derived from silk cocoon: a hybrid Li–S-silk supercapacitor

  • Himanshi Jangir
  • Mohit Pandey
  • Rishabh Jha
  • Amarish Dubey
  • Shourya Verma
  • Deepu Philip
  • Sabyasachi SarkarEmail author
  • Mainak DasEmail author
Original Article


Li and S compounds are currently exploited for their applications in battery industry. Here, we discovered that Li–S compounds exhibit supercapacitor like properties in a context-dependent manner viz., when Li and S atoms are entrapped in a conductivity cage of N-doped reduced graphene oxide (ND–RGO) supercapacitor derived from silk cocoon, it resulted in the formation of a superior hybrid Li–S-silk (ND–RGO–Li–S) supercapacitor. Interestingly, ND–RGO–Li–S proves to be a better supercapacitor than ND–RGO alone. Electrochemical properties of ND–RGO versus ND–RGO–Li–S indicated that the later has higher capacitance (~ 10.72%), lower resistance (~ 2.98%), and higher time constant or relaxation time (~ 7.52%). Thus, in one of the first attempts, caging Li and S in ND–RGO supercapacitor matrix offers a new role for Li–S, as an improved supercapacitor, unlike its current application as a battery.


Lithium sulfide Nitrogen-doped reduced graphene oxide Silk cocoon Supercapacitor Li-S-silk supercapacitor Biocharring 



This work is part of HJ’s doctoral and pre-doctoral dissertation work. MD would like to thank ISRO, GOI for the financial support. HJ is being supported by MHRD, GOI.

Author contributions

HJ conceived the idea of entrapping the Li and S in an ND–RGO matrix, and synthesized and electrochemically characterized the complex and wrote the manuscript. RJ performed the theoretical and mathematical analysis of the data and wrote the manuscript. SV assisted in structural analysis of the complex. DP helped in optimizing ND–RGO synthesis. SS suggested the idea of wrapping the Li–S complex in carbon matrix and assisted in writing the manuscript. MD laid the overall framework of this study and designed the experiments with HJ and assisted in writing the manuscript.

Compliance with ethical standards

Conflict of interest

All authors declare that there is no competing financial interest in the present work.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Himanshi Jangir
    • 1
  • Mohit Pandey
    • 1
  • Rishabh Jha
    • 2
  • Amarish Dubey
    • 1
  • Shourya Verma
    • 3
  • Deepu Philip
    • 4
  • Sabyasachi Sarkar
    • 5
    Email author
  • Mainak Das
    • 1
    • 6
    Email author
  1. 1.Bio-electricity, Green Energy, Physiology & Sensor Group, Department of Biological Sciences and BioengineeringIndian Institute of TechnologyKanpurIndia
  2. 2.Simulate Learning Solutions Private LimitedKanpurIndia
  3. 3.Department of Computing Science and PhysicsUniversity of Glasgow, GlasgowGlasgowScotland, UK
  4. 4.Industrial and Management EngineeringIndian Institute of TechnologyKanpurIndia
  5. 5.Nanoscience and Synthetic Leaf Laboratory, Downing Hall, Center for Healthcare Science and TechnologyIndian Institute of Engineering Science & TechnologyShibpurIndia
  6. 6.Product Development, Design ProgramIndian Institute of TechnologyKanpurIndia

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