TiO2 nanotube arrays were synthesized by electrochemical anodization and were sensibilized with CoFe2O4-GO via hydrothermal synthesis. The materials were characterized by FESEM, GIXRD, voltammetry and Mott Schottky measurements. The crystalline phases in TiO2-CoFe2O4-OG electrodes were anatase and cobalt ferrite. The morphology showed nanotubes with length of 2 µm and completely coated with the CoFe2O4-OG. The visible-light photoresponse of TiO2 nanotubes was enhanced two times by TiO2-CoFe2O4 and four times by TiO2-CoFe2O4-OG electrodes. The photocurrent density of TiO2-CoFe2O4-OG composite was the highest when is compared with TiO2, TiO2-GO and TiO2-CoFe2O4 due to the CoFe2O4 allowed lower energy absorptions in visible light range. Besides, the incorporation of GO facilitated the charge transport and supplied a way to decrease the energy of TiO2 photoactivation. The photoelectrocatalytic activity was evaluated by oxidation of aqueous solutions of glycerol in which an 82% was oxidized with TiO2-CoFe2O4-OG during 1.5 hours.

Enhancement in photoelectrocatalytic activity of TiO2 nanotube arrays sensibilized with CoFe2O4-graphene oxide composite for glycerol oxidation

251st National Meeting (2016)

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