TY - JOUR
T1 - Pt and Au/TiO2 photocatalysts for methanol reforming
T2 - Role of metal nanoparticles in tuning charge trapping properties and photoefficiency
AU - Naldoni, Alberto
AU - D'Arienzo, Massimiliano
AU - Altomare, Marco
AU - Marelli, Marcello
AU - Scotti, Roberto
AU - Morazzoni, Franca
AU - Selli, Elena
AU - Dal Santo, Vladimiro
PY - 2013/2/7
Y1 - 2013/2/7
N2 - Metal-loaded TiO2 is, by far, one of the most important class of photocatalysts in hydrogen production through photoreforming of organics and water photosplitting. In this study anatase loaded with Au and Pt nanoparticles (Au/TiO2 and Pt/TiO2) by an impregnation-reduction method was investigated as for morphological, electronic (XPS) and photocatalytic properties in hydrogen production by methanol photoreforming. The electron and hole trapping centers, Ti3+ and O−, respectively, formed under UV–vis irradiation of the photocatalysts, were studied by in situ electron spin resonance (ESR) spectroscopy. The nature of the loaded metal affected both the H2 evolution rate and the distribution of the methanol oxidation products. The better performance of Pt/TiO2 is attributable to the greater ability of Pt with respect to Au to act as electron sink, slowering the recombination of photoproduced electron–hole couples. Direct evidence of this effect was obtained by ESR analysis, showing that the amount of Ti3+ active sites follows the order TiO2 > Au/TiO2 ≫ Pt/TiO2, thus confirming easier electron transfer from Ti3+ to Pt, where the H+ reduction to H2 occurs.
AB - Metal-loaded TiO2 is, by far, one of the most important class of photocatalysts in hydrogen production through photoreforming of organics and water photosplitting. In this study anatase loaded with Au and Pt nanoparticles (Au/TiO2 and Pt/TiO2) by an impregnation-reduction method was investigated as for morphological, electronic (XPS) and photocatalytic properties in hydrogen production by methanol photoreforming. The electron and hole trapping centers, Ti3+ and O−, respectively, formed under UV–vis irradiation of the photocatalysts, were studied by in situ electron spin resonance (ESR) spectroscopy. The nature of the loaded metal affected both the H2 evolution rate and the distribution of the methanol oxidation products. The better performance of Pt/TiO2 is attributable to the greater ability of Pt with respect to Au to act as electron sink, slowering the recombination of photoproduced electron–hole couples. Direct evidence of this effect was obtained by ESR analysis, showing that the amount of Ti3+ active sites follows the order TiO2 > Au/TiO2 ≫ Pt/TiO2, thus confirming easier electron transfer from Ti3+ to Pt, where the H+ reduction to H2 occurs.
KW - n/a OA procedure
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84870681220&partnerID=MN8TOARS
U2 - 10.1016/j.apcatb.2012.11.006
DO - 10.1016/j.apcatb.2012.11.006
M3 - Article
VL - 130-131
SP - 239
EP - 248
JO - Applied catalysis B: environmental
JF - Applied catalysis B: environmental
SN - 0926-3373
ER -