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11th World Congress on Green Chemistry and Technology

Geneva, Switzerland

Shady Abdelnasser

professor

Title: Sodium-assisted TiO2nanotube arrays of novel electrodes for photochemical sensing platform
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Biography

Biography: Shady Abdelnasser

Abstract

n recent years, the study of modified-TiO2based electrodes has gained great attention to help improve its photo-electrochemical performance. Modifications with metals [1,2], non-metals [3,4], transition metals [5,6] and rare-earth metals [7,8]have been studied; however, research in alkali-modified TiO2is limited when compared to the aforementioned strategies. Owing to their low first ionization potentials, alkali metals supposed toreduce the total work function of TiO2, which can be an effective way to improve the performance of titania-based catalysts[9]. Herein, we investigatethedesign and characterization ofefficient sodium-modified TiO2photo-electrodes readily prepared by the electrochemical anodization of titanium metal followed by soaking treatment in aqueous solution containing quantitative NaOH alkaline medium.The crystalline properties revealed no change in the main peak positions and shapes of pristine TiO2which signifies that the existence of sodium did not affect the crystalline structure of TiO2; the modification was only confined to the surface of the nanotubes. Our analysis of the photo-electric properties showed that thesurface modified photo-catalysts exhibited an almost threefold increase in their photocurrent response (0.66 mA cm-2) relevant to the unmodified TiO2(0.22 mAcm-2) under 1 sun intensity; these feature were ascribed to the former’s remarkable charge separation and mobility. 
 
to the former’s remarkable charge separation and mobility. 


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