Tiwari, Amritanjali and Pal, Ujjwal (2015) Effect of donor-donor-π-acceptor architecture of triphenylamine-based organic sensitizers over TiO2 photocatalysts for visible-light-driven hydrogen production. International Journal of Hydrogen Energy, 40 (30). pp. 9069-9079.

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In this paper, we report a series of triphenylamine (TPA) donor based dyes in sensitized hydrogen production over TiO2–Pt catalysts under visible light. Among the selected dyes, 4-(diphenylamino) phenylcyanoacrylic acid (DN-F01), 5-[4-(diphenylamino)phenyl]thiophene-2-cyanoacrylic acid (DN-F02), 3-(5-(4-(diphenylamino)styryl) thiophen-2-yl)-2-cyanoacrylic acid (DN-F03), (E)-3-(5-(4-(bis(2′,4′-dibutoxy-[1,1′-biphenyl]-4-yl)amino)phenyl) thiophen-2-yl)-2-cyanoacrylic acid (DN-F04) and 3-(6-(4-(bis(2′,4′-dibutoxy-[1,1′-biphenyl]-4-yl)amino)phenyl)-4,4-dihexyl-4H-cyclopenta[1,2-b:5,4-b′] dithiophen-2-yl)-2-cyanoacrylic acid (DN-F05) were adsorbed on Pt–TiO2 and tested for photocatalytic hydrogen production under visible-light in presence of triethanolamine (TEOA) as sacrificial electron donor (SED). The enhanced light absorption and effective interfacial charge transfer from excited dye to TiO2 is significant in DN-F05-TiO2. The DN-F05 sensitized Pt–TiO2 (DN5@T) photocatalyst exhibited higher turnover number (TON 1864) and apparent quantum efficiency (AQE ∼44%) when compared to their corresponding simple architecture dye molecules. Moreover, the additional donating group di-butoxyphenyl and dihexyl-cyclopentyl π-conjugated bridge units provide an excellent surface protection through steric hindrance leading to a good photocatalytic performance. Electrochemical and computational studies suggest the better photocatalytic activity of DN5@T. The photocatalyst shows long term stability and reproducibility at neutral pH.

Item Type: Article
Subjects: Chemistry
Depositing User: Dr. Sarita Ghosh
Date Deposited: 19 Aug 2016 07:48
Last Modified: 19 Aug 2016 07:48
URI: http://cmeri.csircentral.net/id/eprint/215

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