Current Applied Physics

Korean Physical Society (한국물리학회)
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Supercapacitive properties of electrodeposited $RuO_2$ electrode in acrylic gel polymer electrolytes

  • Kim, Kwang Man (Research Section of Power Control Devices, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Nam, Ji Hyun (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Lee, Young-Gi (Research Section of Power Control Devices, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Cho, Won Il (Energy Storage Research Center, Korea Institute of Science and Technology) ;
  • Ko, Jang Myoun (Department of Chemical and Biological Engineering, Hanbat National University)
  • Received : 2013.02.21
  • Accepted : 2013.06.20
  • Published : 2013.10.30
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Abstract

Hydrous ruthenium oxide ($RuO_2$) is prepared by electrodeposition on a platinum substrate and its supercapacitive properties are characterized adopting acrylic gel polymer electrolytes, such as poly(-acrylic acid) (PAA), potassium polyacrylate (PAAK), and poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS). The electrodeposited hydrous $RuO_2$ exhibits an amorphous compact stratified morphology with a higher loading (0.15 mg $cm^{-2}$) than that of a previous report, and shows broad redox peaks on both cathodic and anodic scans in the cyclic voltammetry. In particular, the $RuO_2$ electrode for supercapacitor adopting the PAMPS electrolyte shows the highest specific capacitance of 642 F $g^{-1}$ at 20 mV $s^{-1}$. This is due to the efficient utilization of active $RuO_2$ species and greater proton accommodation toward the negative oxygen sites of PAMPS's side chain. In addition, it is possible to improve sustainability against high-rate current with the $RuO_2$ electrode with the PAMPS electrolyte, due to the crosslinks of the gel electrolyte, which support the mechanical strength.

Keywords

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