Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Visible Light-Driven $CuInS_2-TiO_2$ Nanotube Composite Photoelectrodes with Heterojunction Structureusing Pulsed-Electrochemical Deposition Process

Pulse 전위를 적용한 전기화학적 증착 공정으로 제조된 가시광 활성 이종접합 $CuInS_2-TiO_2$ Nanotube 화합물 광전극

  • Yun, Jung-Ho (ARC Centre of Excellence for Functional Nanomaterials, School of Chemical Engineering, The University of New South Wales) ;
  • Amal, Rose (ARC Centre of Excellence for Functional Nanomaterials, School of Chemical Engineering, The University of New South Wales) ;
  • Park, Young-Koo (Department of Evironmental Engineering, Kangwon National University)
  • Received : 2013.02.05
  • Accepted : 2013.03.24
  • Published : 2013.03.30
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Abstract

Excellent electron transport properties with enhanced light scattering ability for light harvesting have made well-ordered one dimensional $TiO_2$ nanotube(TNT) arrays an alternative candidate over $TiO_2$ nanoparticles in the area of solar energy conversion applications. The principal drawback of TNT arrays being activated only by UV light has been addressed by coupling the TNT with secondary materials which are visible light-triggered. As well as extending the absorption region of sunlight, the introduction of these foreign components is also found to influence the charge separation and electron lifetime of TNT. In this study, a novel method to fabricate the TNT-based composite photoelectrodes employing visible responsive $CuInS_2$ (CIS) nanoparticles is presented. The developed method is a square wave pulse-assisted electrochemical deposition approach to wrap the inner and outer walls of a TNT array with CIS nanoparticles. Instead of coating as a dense compact layer of CIS by a conventional non-pulsed-electrochemical deposition method, the nanoparticles pack relatively loosely to form a rough surface which increases the surface area of the composite and results in a higher degree of light scattering within the tubular channels and hence a greater chance of absorption. The excellence coverage of CIS on the tubular $TiO_2$ allows the construction of an effective heterojunction that exhibits enhanced photoelectrochemical performance.

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References

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