Na2MoO4-incorporated polymer gel electrolyte for high energy density flexible supercapacitor

M. Sandhiya, Vivekanand, Srinivasan Suresh Balaji, M. Sathish

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

The recent advancement in flexible/bendable displays such as phones, smart bands, laptops, and televisions demands flexible energy storage devices. Heteroatom-doped graphene electrodes are promising candidates for flexible energy-storage applications because of its dual nature of electrochemical double-layer capacitance and pseudocapacitance. The low energy density of supercapacitors limits their potential use and attempts are in progress to overcome this issue. Redox-additive electrolytes are presumed to be one of the elite tactics to augment the energy density of the supercapacitor device. Here, the sodium molybdate (Na2MoO4)-incorporated polymer gel electrolyte has been demonstrated to enhance the energy density of a flexible supercapacitor. The supercapacitor electrode with Na2MoO4/H2SO4 (714 F/g) acquired ∼2.4-fold greater specific capacitance than with H2SO4 (300 F/g) in a three-electrode configuration. Moreover, the energy density of symmetric supercapacitor with Na2MoO4/H2SO4 (23 Wh/kg) is ∼2-fold higher compared with H2SO4 electrolyte (13 Wh/kg). The fabricated flexible supercapacitor device with sodium molybdate/ poly(vinyl alcohol)/sulfuric acid (Na2MoO4/PVA/H2SO4) gel electrolyte showed 3.4-fold higher energy density (E = 24 Wh/kg) compared to a device with PVA/H2SO4 gel electrolyte (E = 7 Wh/kg). The increase in energy density has been observed after the incorporation of Na2MoO4, which is due to the faradaic reaction between the MoO24 ions in the redox-additive and H+ ions in the H2SO4 electrolyte.

Original languageEnglish
Pages (from-to)11368-11377
Number of pages10
JournalACS Applied Energy Materials
Volume3
Issue number11
DOIs
StatePublished - 23 Nov 2020
Externally publishedYes

Keywords

  • Flexible supercapacitor
  • Heteroatom doped graphene
  • High energy density
  • Redox additives
  • Sodium molybdate

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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