Carbon letters

  • 제27권
  • /
  • Pages.64-71
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  • 2018
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  • 1976-4251(pISSN)
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  • 2233-4998(eISSN)
한국탄소학회 (Korean Carbon Society)
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Anatase TiO2-doped activated carbon fibers prepared by ultrasonication and their capacitive deionization characteristics

  • Kang, Da Hee (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Jo, Hanjoo (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Jung, Min-Jung (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Kim, Kyoung Hoon (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Lee, Young-Seak (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 투고 : 2017.08.09
  • 심사 : 2017.12.19
  • 발행 : 2018.07.31
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초록

$TiO_2$-doped activated carbon fibers (ACFs) were successfully prepared as capacitive deionization (CDI) electrode materials by facile ultrasonication-assisted process. ACFs were treated with titanium isopropoxide (TTIP) and isopropyl alcohol solutions of different concentrations and then calcinated by ultrasonication without heat-treatment. The results show that a certain amount of anatase $TiO_2$ was present on the ACF surface. The specific capacitance of the $TiO_2$-doped ACF electrode was remarkably improved (by 93.8% at scan rate of $50mV\;s^{-1}$) over that of the untreated ACF electrode, despite decreases in the specific surface area and total pore volume upon $TiO_2$ doping. From the CDI experiments, the salt adsorption capacity and charge efficiency of the sample with TTIP percent concentration of 15% were found to considerably increase by 71.9 and 57.1%, respectively. These increases are attributed to the improved wettability of the electrode, which increases the number of surface active sites and facilitates salt ion diffusion in the ACF pores. Additionally, the Ti-OH groups of $TiO_2$ act as electrosorption sites, which increases the electrosorption capacity.

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참고문헌

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