Solar Energy Materials and Solar Cells, Vol.160, 463-469, 2017
Visible and direct sunlight induced H-2 production from water by plasmonic Ag-TiO2 nanorods hybrid interface
This report signifies the synthesis of TiO2 nanorods (TNR similar to 79 nm) and nanospheres (TNS similar to 19 nm) and their Ag loaded counterparts AgTNR and AgTNS for the photocatalytic hydrogen production from water under monochromatic visible and direct sunlight. The Ag-TNR nanohybrid junction was sensitized at a matching monochromatic wavelength of 457 nm and sunlight to produce similar to 90 mu mol and 105 mu mol of gas, respectively, increase in the efficiency is explained due to the surface plasmon (SPR) effect of Ag nanoparticles and is also correlated to fluorescence quenching (due to better charge distribution along larger nano-interface), crystal structure and surface area (146 m(2) g(-1)) of fabricated AgTNR nanocomposite. The elongated morphology of AgTNR led to the effective distribution of charge along larger interface resulting in the increase of photocurrent density (0.01 rnA/cm(2)) which boosts the reaction rate. Plasmonic metal (Ag) activated with matching wavelength to SPR produces an electric field and the TiO2 present in the proximity encounters these effects results in the formation of Schottky barrier, the SPR effect is also more towards Ag-TiO2 interface which results in the ejection of electron towards the conduction band of TNR. This study demonstrated that Ag nanoparticles loaded lengthy TiO2 nanorods (similar to 79 nm) exhibited highly improved H-2 production (90 mu mol) from water relative to TiO2 nanospheres (similar to 19 nm) due to the plasmonic effect at 457 nm light irradiation that also exhibited better H-2 production (105 mu mol) rate under direct sun light (8 h) exposure.
Keywords:Anisotropic TiO2 nanostructure;Elongated nanohybrid interface;Plasmonic effect of Ag;Hydrogen production;Monochromatic visible and sunlight