TY - NEWS
TI - Suplemento Photoanodes modified with reduced graphene oxide to enhance photoelectrocatalytic performance of B-TiO2 under visible light
AU - Gualdrón Reyes, Andrés F.
AU - Meléndez, Angel M.
AU - Niño Gómez, Martha E.
AU - Rodríguez González, Vicente
AU - Carreño Lizcano, María I.
AB - The effect of reduced graphene oxide (rGO) content in boron-modified TiO2 nanocrystalline films on their photocatalytic activity in phenol oxidation is investigated. Visible-light-active TiO2 modified photoanodes were prepared  by incorporating graphene sheets into the sol-gel reaction of B-TiO2,   followed by depositing the reaction products on 304 stainless steel plates by dip-coating technique. Thin films obtained by in situ sol-gel synthesis were characterized by FESEM, GIXRD and UV–vis diffuse reflectance spectroscopy. FESEM examination showed cracked films due to the tensile stress generated by solvent evaporation. GIXRD results showed that boron in the films inhibits the growth of crystallites. Comparing to unmodified TiO2, B-TiO2/rGO showed a red shift in the band gap. The potentiodynamic anodic polarization measurements showed that graphene incorporation improved the photogenerated electron transport within the film, hence increasing the photocurrent. These enhancements are explained on the basis of the ability of graphene in promoting the charge carrier separation by transferring the photogenerated electrons from the illuminated photoanode to the substrate. The film B-TiO2/rGO obtained from the sol solution containing 0.03 wt/v% boron  and 3 wt/v% graphene exhibited the highest photocurrent, which was 30 times larger compared with the photocurrent of TiO2 film.
DA - 2015-11-18
KW - Películas delgadas de materiales compuestos
KW - Composite thin films
KW - Fotoelectrodos modificados de TiO2os modificados de TiO2
KW - Modified TiO2 photoelectrode
KW - Grafeno
KW - Graphene
KW - Transporte elecrónico
KW - Electron transport
KW - Oxidación fotoelectrocatalítica
KW - Photoelectrocatalytic oxidation.
PB - Academia Colombiana de Ciencias Exactas, Físicas y Naturales
UR - https://repositorio.accefyn.org.co/handle/001/891
ER -