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MnO2 Nanowires Electrodeposited in a Porous Network of Agarose Gel as a Pseudocapacitor Electrode

  • Jin, Sohyun (Department of Chemistry, Kookmin University) ;
  • Ryu, Ilhwan (Department of Chemistry, Kookmin University) ;
  • Lim, Geo (Department of Biology, Boston University) ;
  • Yim, Sanggyu (Department of Chemistry, Kookmin University)
  • Received : 2020.02.03
  • Accepted : 2020.07.30
  • Published : 2020.11.30

Abstract

Despite a simple preparation of manganese oxide (MnO2) nanowires by electrodeposition, the improvement in specific capacitance (Csp) and voltammetric response of the MnO2 nanowire-based electrodes has been quite limited. This is attributed to the poor electrical conductivity of MnO2 and its dense bulk morphology due to the aggregation of the nanowires. This study investigated the capacitive performance of MnO2 nanowires electrodeposited on agarose thin films. The good ionic conductivity and porous network of the agarose film provided favorable growth conditions for the MnO2 nanowires with suppressed aggregation. A maximum Csp value of 686 F/g measured at a scan rate of 10 mV/s was obtained, which was significantly larger than that of 314 F/g for the agarose-free MnO2 electrode at the same scan rate. The rate capability was also improved. The Csp measured at a high scan rate of 100 mV/s retained 74.0% of the value measured at 10 mV/s, superior to the retention of 71.1% for the agarose-free MnO2 electrode.