Photocatalytic H2 Production from Ethanol–Water Mixtures Over Pt/TiO2 and Au/TiO2 Photocatalysts: A Comparative Study

Comparing the Reaction Rates of Plasmonic (Gold) and Non-Plasmonic (Palladium) Metal Particles in Photocatalytic Hydrogen Production

“…3 nm) all metal atoms are quantified because the escape depth of the photoelectrons excited by Al K α line (about 2 nm, which makes it possible to account for particles with diameter up to about 4 nm). In other words, when compared to UV light, excitation with UV-Vis resulted in reaction rate that are This result is different from our earlier reports on M/ TiO 2 systems, where the catalysts where tested under only UV light [17,19]. This difference can be linked in part to plasmonic effect of Au; responding under visible light irradiation.…”

“…Loading of noble metal nanoparticles such as Pt, Pd and Rh on TiO 2 is needed to improve its photocatalytic efficiency [15,16]. The role of noble metal particles, their particle size and dispersion effect has been studied by us and others for a while [4,[17][18][19][20][21][22][23][24]. Their role is, so far, understood as an electron sink to reduce charge carrier recombination rate and therefore increase H + reduction (a much slower process) to molecular hydrogen.…”

Heterojunction Synergies in Titania‐Supported Gold Photocatalysts: Implications for Solar Hydrogen Production

“…We have found previously that an EtOH concentration of 80 vol % was optimal for H 2 production in Au/TiO 2 systems, [14,52] there- ). This is rationalised because rutile has adirect band gap, whichresults in higher electron-hole recombination rates, [27,53,54] and rutile has larger particles izes and al ower specific surface area (Table 1).…”

“…www.chemsuschem.org 87.3 eV in a4:3 peak area ratio were found for all Au/TiO 2 photocatalysts( Figure 3B), which are assigned to the Au 4f 7/2 and Au 4f 5/2 peaks of Au 0 . [18,52] Evidence for the formationo fs trongly rectifying Au-TiO 2 Schottky junctionsi ss een in the photoluminescence (PL)s pectra ( Figure 3C). The three bareT iO 2 supports showeda ni ntense PL signal caused by rapid electronhole pair recombination after UV exposure.…”

Hydrogen evolution in the photocatalytic reaction between methane and water in the presence of CO2 on titanate and titania supported Rh and Au catalysts

“…In addition, it was shown with electron paramagnetic resonance that the water and carbonates have got important roles in the overall photocatalytic reduction of carbon dioxide using TiO 2 [69]. Water plays an also important role in the photocatalytic H 2 production from ethanol-water mixtures over Pt/TiO 2 and Au/TiO 2 photocatalysts [70] and in alcohol-water mixtures on Au doped hydrogen TNT [10].…”