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http://dx.doi.org/10.12925/jkocs.2013.30.1.049

Visible Light-Driven $CuInS_2-TiO_2$ Nanotube Composite Photoelectrodes with Heterojunction Structureusing Pulsed-Electrochemical Deposition Process  

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)
Publication Information
Journal of the Korean Applied Science and Technology / v.30, no.1, 2013 , pp. 49-56 More about this Journal
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.
Keywords
solar energy; nanotube; photoelectrodes; electrochemical; non-pulsed-electrochemical;
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