부산대학교 도서관

In this work, hematite with titanium dioxide ([alpha]-Fe.sub.2O.sub.3/TiO.sub.2) heterojunctions with palladium (Pd) nanoparticles were synthesised to improve efficiency of photocatalytic hydrogen production. [alpha]-Fe.sub.2O.sub.3 was loaded onto TiO.sub.2 surfaces, then Pd nanoparticles were deposited to make a ternary photocatalyst. The chemical composition, morphology and surface properties of photocatalytic ternary heterojunction were characterized by XRD, UV-Vis, FE-SEM, TEM, EDS, XPS techniques and BET analysis. The PL emission, transient photocurrent and EIS Nyquist plot were investigated for separation and migration of photogenerated charge carriers in photocatalyst nanocomposites. The average crystallite size of ternary [alpha]-Fe.sub.2O.sub.3/TiO.sub.2-Pd was 22 nm and its band gap energy was 2.00 eV, much lower than that of the pure TiO.sub.2 nanoparticles (3.16 eV). The [alpha]-Fe.sub.2O.sub.3/TiO.sub.2-Pd also has higher specific surface area and smaller EIS radius, which enhance interface activity and charge transfer. The [alpha]-Fe.sub.2O.sub.3/TiO.sub.2-Pd exhibited great performance, with H.sub.2 production rate of 3490.54 [micro]mol h.sup.-1 g.sup.-1 and excellent stability in multi-cycle H.sub.2 production. The photocatalytic mechanism of [alpha]-Fe.sub.2O.sub.3/TiO.sub.2-Pd as explained by the S-scheme heterojunction is that the electron in the VB of [alpha]-Fe.sub.2O.sub.3 and TiO.sub.2 are transferred to CB of each photocatalyst. Then, the electrons in the CB of TiO.sub.2 are transferred to the VB of [alpha]-Fe.sub.2O.sub.3 and the photogenerated electrons in CB of [alpha]-Fe.sub.2O.sub.3 can migrate to Pd, which increase the redox ability for H.sub.2 production and increase the separation of photogenerated e.sup.--h.sup.+ pairs. Overall, the experimental results and theoretical analyses confirm the high potential for the applicability of the ternary photocatalysts for H.sub.2 production. Graphical Abstract
Author(s): Weerapong Bootluck [sup.1] [sup.2], Thawat Chittrakarn [sup.2], Kuaanan Techato [sup.1] [sup.3], Panitan Jutaporn [sup.4], Watsa Khongnakorn [sup.2] [sup.5] Author Affiliations: (1) grid.7130.5, 0000 0004 0470 1162, Faculty of Environmental [...]