The photocatalytic splitting of H2O into H2 and O2 is the most simple method for solar energy utilization. In this study, dye modification effects on KTa(Zr)O3 and also Ga(Zn)N(O) catalyst was studied and it was found that H2 and O2 formation rate could be much improved by modifying with an organic dye, in particular, Cr-Tetraphenylporphyrin (Cr-TPP) and Pt co-catalyst. Photoexcitation mechanism for dye modified catalyst was also studied in details by transient photoluminescent spectroscopy and it was suggested that two step excitation occurred in dye-modified KTaO3 photocatalyst. Although absorption of irradiated light is occurred on Cr-TPP, wavelength dependence of the activity of dye-modified KTaO3 photocatalysts indicated that the excitation of both KTaO3 and dye was essential for achieving the high photocatalytic activity. The formation rate of H2 and O2 are 575.0 and 280.4 �mol gcat-1h-1, respectively, under full arc of Xe lamp.  In order to confirm the photo excitation route and expanding the absorption frequency to visible light, we used Ga(Zn)N(O) instead of KTa(Zr)O3. As shown in figure, it is obvious that H2 formation is observed at wavelength higher than 420nm and well corresponded with the absorption curve when the catalyst was modified with Ni/RuOx/Alizarin yellow R. Therefore, by replacing the inorganic phtocatalyst to visible light responsible one, the dye modified photocatalyt shows the reasonable activity to complete water splitting.

Complete water splitting on dye modified photocatalyst: From KTa(Zr)O<sub>3</sub> to Ga(Zn)N(O)

246th National Meeting (2013)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.

Complete water splitting on dye modified photocatalyst: From KTa(Zr)O3 to Ga(Zn)N(O)

Complete water splitting on dye modified photocatalyst: From KTa(Zr)O₃ to Ga(Zn)N(O)