Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effect of TiO2 Nanotube Length on Photocatalytic Activity with Different Light Intensities: Cr(VI) Reduction and Hydrogen Production

광량 및 TiO2 나노튜브 길이별 광활성 연구: Cr(VI)환원 및 수소제조

  • Joo, Hyun-Ku (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Shim, Eun-Jung (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Lee, Jae-Min (Dept. of Chemical and Biomolecular. Engr., Yonsei Univ.) ;
  • Yoon, Jae-Kyung (Hydrogen Energy Research Center, Korea Institute of Energy Research)
  • 주현규 (한국에너지기술연구원 수소에너지센터) ;
  • 심은정 (한국에너지기술연구원 수소에너지센터) ;
  • 이재민 (연세대학교 화공생명공학과) ;
  • 윤재경 (한국에너지기술연구원 수소에너지센터)
  • Received : 2011.05.16
  • Accepted : 2011.08.22
  • Published : 2011.08.30
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Abstract

Anodized tubular $TiO_2$ electrodes (ATTEs) with three noticeably different lengths are prepared to determine their optimum length for the photo-driven activity in the reaction of Cr(VI) reduction and hydrogen evolution. The ATTEs with ethylene glycol have longer $TiO_2$ tubes (7-15.6 ${\mu}m$) than those with hydrfluoric acid (0.6-0.8 ${\mu}m$). These samples, which differ only in the length of the tubes, with a wall thickness of ca. 20 nm, consist mainly of an anatase crystalline phase after heat treatment at $650^{\circ}C$, since the anatase crystallites at the tube walls do not undergo transformation into rutile phase, due to the constraints imposed by the wall thickness. Among them, the medium size (ca. 8 ${\mu}m$) tubes provide the optimum conditions, irrespective of the light intensity, which is explained in terms of the correlation between the amount of photons and the adsorbed electron acceptors and their location. Photocatalytic Cr(VI) reduction leads to ca. 60% reduction of Cr(VI) even under 1 sun irradiation with the medium-sized anodized $TiO_2$ tubes, but only ca. 20% with the short- and long-sized tubes. For hydrogen evolution, tubes longer than 8 ${\mu}m$ do not exhibit better performance with any light intensity.

Keywords

References

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