TiO2 nanotubes (NTs) arrays of different lengths were prepared by anodization in NH4F-H2O-formamide solutions and characterized by SEM, XRD and photocurrent measurements; their photoactivity was studied by evaluating the amount of H2 evolved in a PEC cell for separate H2 and O2 production with no applied bias. Phase composition and NTs lengths were strictly related to the anodization time: its increase led to an increase of the anatase phase and to the formation of a compact TiO2 layer on the NTs top. Due to its mixed anatase-rutile composition and peculiar structure, the array prepared by 40 min long anodization exhibited the highest hydrogen production rate of ~ 83 mmol h-1 m-2 (i.e. 1.9 NL h-1 m-2).
TiO2 nanotubes arrays: synthesis, characterization and application to hydrogen production by photocatalytic water splitting / M. Altomare, M. Allieta, L.G. Bettini, M. Pozzi, E. Selli - In: 7th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications / [a cura di] A. Silva, C. Gomes Silva, J.L. Faria, R. Segundo, V.J.P. Vilar. - Porto, Portugal : Sociedade Portuguesa de Química, 2012 Jun. - ISBN 978-989-97667-4-7. - pp. 684-685 (( Intervento presentato al 7. convegno European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications tenutosi a Porto, Portugal nel 2012.
TiO2 nanotubes arrays: synthesis, characterization and application to hydrogen production by photocatalytic water splitting
M. AltomarePrimo
;M. AllietaSecondo
;L.G. Bettini;E. SelliUltimo
2012
Abstract
TiO2 nanotubes (NTs) arrays of different lengths were prepared by anodization in NH4F-H2O-formamide solutions and characterized by SEM, XRD and photocurrent measurements; their photoactivity was studied by evaluating the amount of H2 evolved in a PEC cell for separate H2 and O2 production with no applied bias. Phase composition and NTs lengths were strictly related to the anodization time: its increase led to an increase of the anatase phase and to the formation of a compact TiO2 layer on the NTs top. Due to its mixed anatase-rutile composition and peculiar structure, the array prepared by 40 min long anodization exhibited the highest hydrogen production rate of ~ 83 mmol h-1 m-2 (i.e. 1.9 NL h-1 m-2).
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