Skip to main content
placeholder image

Enhanced supercapacitive performances of functionalized activated carbon in novel gel polymer electrolytes with ionic liquid redox-mediated poly(vinyl alcohol)/phosphoric acid

Journal Article


Download full-text (Open Access)

Abstract


  • Supercapacitors with solid/gel polymer electrolytes have attracted much attention due to their high reliability, flexibility, facile designing, being separator-free and free from electrolyte leakage and volatilization such that they can meet the increasing demands of practical applications. The present work reports on a functionalized activated carbon (AC) supercapacitor based on novel redox-mediated gel polymer electrolyte, PVA/H3PO4/ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate, [EMIM]BF4). The electrochemical properties of this supercapacitor were studied using cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy techniques with various concentrations of [EMIM]BF4 in PVA/H3PO4 gel polymer electrolyte. The incorporation of [EMIM]BF4 in PVA/H3PO4 electrolyte effectively increased the specific capacitance value due to the improved ionic conductivity and additional pseudo-reaction occurring in the electrode/electrolyte interfaces. The specific capacitance of the supercapacitor using PVA/H3PO4/[EMIM]BF4 (50%) electrolyte showed a maximum value of 271 F g-1 at 0.5 A g-1 discharge current, which is much higher than the bare PVA/H3PO4 (103 F g-1) based supercapacitor. The supercapacitor with PVA/H3PO4/[EMIM]BF4 (50%) electrolyte showed enhanced energy and power density of 54.3 W h kg-1 and 23.88 kW kg-1 respectively. Moreover the device showed comparable specific capacitance retention after 3000 cycles of charge/discharge.

UOW Authors


  •   Jang, Hyun Seok (external author)
  •   Raj, C Justin. (external author)
  •   Lee, Won-Gil (external author)
  •   Kim, Byung Chul. (external author)
  •   Yu, Kook Hyun (external author)

Publication Date


  • 2016

Citation


  • Jang, H., Raj, C. Justin., Lee, W., Kim, B. Chul. & Yu, K. (2016). Enhanced supercapacitive performances of functionalized activated carbon in novel gel polymer electrolytes with ionic liquid redox-mediated poly(vinyl alcohol)/phosphoric acid. RSC Advances, 6 (79), 75376-75383.

Scopus Eid


  • 2-s2.0-84982098348

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3206&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2185

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 75376

End Page


  • 75383

Volume


  • 6

Issue


  • 79

Place Of Publication


  • United Kingdom

Abstract


  • Supercapacitors with solid/gel polymer electrolytes have attracted much attention due to their high reliability, flexibility, facile designing, being separator-free and free from electrolyte leakage and volatilization such that they can meet the increasing demands of practical applications. The present work reports on a functionalized activated carbon (AC) supercapacitor based on novel redox-mediated gel polymer electrolyte, PVA/H3PO4/ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate, [EMIM]BF4). The electrochemical properties of this supercapacitor were studied using cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy techniques with various concentrations of [EMIM]BF4 in PVA/H3PO4 gel polymer electrolyte. The incorporation of [EMIM]BF4 in PVA/H3PO4 electrolyte effectively increased the specific capacitance value due to the improved ionic conductivity and additional pseudo-reaction occurring in the electrode/electrolyte interfaces. The specific capacitance of the supercapacitor using PVA/H3PO4/[EMIM]BF4 (50%) electrolyte showed a maximum value of 271 F g-1 at 0.5 A g-1 discharge current, which is much higher than the bare PVA/H3PO4 (103 F g-1) based supercapacitor. The supercapacitor with PVA/H3PO4/[EMIM]BF4 (50%) electrolyte showed enhanced energy and power density of 54.3 W h kg-1 and 23.88 kW kg-1 respectively. Moreover the device showed comparable specific capacitance retention after 3000 cycles of charge/discharge.

UOW Authors


  •   Jang, Hyun Seok (external author)
  •   Raj, C Justin. (external author)
  •   Lee, Won-Gil (external author)
  •   Kim, Byung Chul. (external author)
  •   Yu, Kook Hyun (external author)

Publication Date


  • 2016

Citation


  • Jang, H., Raj, C. Justin., Lee, W., Kim, B. Chul. & Yu, K. (2016). Enhanced supercapacitive performances of functionalized activated carbon in novel gel polymer electrolytes with ionic liquid redox-mediated poly(vinyl alcohol)/phosphoric acid. RSC Advances, 6 (79), 75376-75383.

Scopus Eid


  • 2-s2.0-84982098348

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3206&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2185

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 75376

End Page


  • 75383

Volume


  • 6

Issue


  • 79

Place Of Publication


  • United Kingdom