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Improved electrochemical performance of rGO/TiO2 nanosheet composite based electrode for supercapacitor applications

  • Shashank Sundriyal
  • Meenu Sharma
  • Ashwinder Kaur
  • Sunita Mishra
  • Akash Deep
Article

Abstract

The present work reports the synthesis of a composite of TiO2 nanosheets (NS) with reduced graphene oxide (rGO) for supercapacitor applications. The formation of composite has been achieved via a simple one-pot hydrothermal method. The rGO/TiO2 NS composite was used to fabricate a flexible electrode which, in presence of 1 M H2SO4 as an electrolyte, has shown a high specific capacitance of 233.67 F/g at a current density of 1 A/g within a potential window of 0–1 V. This enhanced supercapacitance of the rGO/TiO2 NS electrode is attributed to the synergistic effects from TiO2 and rGO NS which help in to attain a low equivalent series resistance and enhanced ion diffusion. Furthermore, the fabricated composite electrode has displayed a long-term cyclic stability, retaining a specific capacitance of 98.2% even after 2000 charge–discharge cycles. The proposed rGO/TiO2 NS electrode has delivered high values of energy (32.454 Wh/kg) and power (716.779 W/kg) densities. Interestingly, it is possible to retrieve a sufficiently high energy density of 24.576 Wh/kg which could generate a power density value of as high as 2142.84 W/kg. The above results reveal that the herein proposed thin film composite of rGO/TiO2 NS can offer extraordinary performance as a supercapacitor electrode compared to its nanotubes or nanoparticles.

Notes

Acknowledgements

Shashank Sundriyal gratefully acknowledges the Senior Research Fellowship received from the University Grant Commission, India. The funding from the CSIR India project Grant No. MLP-023 is also acknowledged. Authors also thank Director CSIO, Chandigarh.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.CSIR-Central Scientific Instrument Organisation (CSIR-CSIO)ChandigarhIndia
  2. 2.Academy of Scientific and Innovative Research (AcSIR-CSIO)ChandigarhIndia
  3. 3.Department of PhysicsNational Institute of TechnologyKurukshetraIndia
  4. 4.Department of PhysicsPunjabi UniversityPatialaIndia

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