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Nano-dimensional iron tungstate for super high energy density symmetric supercapacitor with redox electrolyte

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Abstract

In present work, we have developed 2.0 V symmetric supercapacitor with rationally prepared iron tungstate (FeWO4) nanoparticles as electrodes and redox-active electrolyte. It is revealed that the electrochemical performances of FeWO4-system were significantly improved due to the addition of potassium iodide (KI) redox additive in conventional KOH electrolyte in terms of the specific capacitance and energy density. Notably, FeWO4-based symmetric cell with KI-additive shown two-fold enhancement in specific energy (113 Wh/kg) compared with the cell with pristine KOH electrolyte (41.62 Wh/kg). Such an excellent enhancement is attributed to the improvement in the stability of existing KOH electrolyte by KI which influences the strength of OH bond in aqueous media and prevents the breakdown of electrolyte without adversely affecting the redox behavior and on contrary supporting the interactions at the higher potential to produce better results.

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Funding

DPD acknowledges the Queensland University of Technology and Australian Research Council (ARC) for the Future Fellowship (FT180100058). D.R.P. would like to thank the Department of Science and Technology (DST) for financial support (IFA-13/MS-05). D.R.P. also likes to thank Korea Institute of Energy Technology Evaluation and Planning funded by the Ministry of Trade, Industry & Energy of the Republic of Korea (20173010012940) and Global Collaborative Research Projects (2016K1A4A3914691) through Korea’s NRF for their support. TDD would like to thank Shivaji University, Kolhapur for the financial assistance under the “Research Initiation Scheme.”

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Authors and Affiliations

  1. Centre for Materials for Electronics Technology, Ministry of Electronics and Information Technology (MeitY), Pune, 411008, India

    Sagar Jadhav & Deepak R. Patil

  2. Computational Electronics and Nanoscience Research Laboratory, School of Nanoscience and Biotechnology, Shivaji University, Kolhapur, 416004, India

    Sagar Jadhav, Pratiksha D. Donolikar & Tukaram D. Dongale

  3. Department of Physics and Astronomy, Center for Novel State of Complex Materials Research, Seoul National University, Seoul, 151-747, Korea

    Sagar Jadhav, Pratiksha D. Donolikar, Nilesh R. Chodankar, Tukaram D. Dongale, Deepak P. Dubal & Deepak R. Patil

  4. Department of Energy & Materials Engineering, Dongguk University, Seoul, 100-715, Republic of Korea

    Nilesh R. Chodankar

  5. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD, 4001, Australia

    Deepak P. Dubal

Authors
  1. Sagar Jadhav
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  2. Pratiksha D. Donolikar
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  3. Nilesh R. Chodankar
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  4. Tukaram D. Dongale
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  5. Deepak P. Dubal
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  6. Deepak R. Patil
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Corresponding authors

Correspondence to Deepak P. Dubal or Deepak R. Patil.

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Jadhav, S., Donolikar, P.D., Chodankar, N.R. et al. Nano-dimensional iron tungstate for super high energy density symmetric supercapacitor with redox electrolyte. J Solid State Electrochem 23, 3459–3465 (2019). https://doi.org/10.1007/s10008-019-04427-x

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  • DOI: https://doi.org/10.1007/s10008-019-04427-x

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