Enhancement of Photocatalytic Water Splitting Rate via Rayleigh Convection

Autor:	Norifumi Isu, Saeko Miwa, Kyota Tokutake, Seiichi Deguchi, Ben Kariya, Hidenori Kato, Junki Tsuge, Haruna Banno, Keisuke Sawada, Shoichiro Imaizumi, Shoji Shimasaki
Rok vydání:	2014
Předmět:	Convection Convective flow Hydrogen Chemistry Diffusion chemistry.chemical_element Thermal treatment Oxygen Physics::Fluid Dynamics symbols.namesake Chemical engineering symbols Rayleigh scattering Physics::Atmospheric and Oceanic Physics Photocatalytic water splitting
Zdroj:	Green and Sustainable Chemistry. :80-86
ISSN:	2160-696X 2160-6951
DOI:	10.4236/gsc.2014.42012
Popis:	In order to enhance photocatalytic water splitting rates with Pt/TiO2 powder, sufficient agitation of the biphasic medium is required to switch surficial reactions to volumetric reactions. Additionally, agitation is conducive to higher diffusion rates of the generated hydrogen and co-produced oxygen, hindering their ability to re-couple to water on Pt loaded to TiO2 powder. In order to create agitation without consuming any electricity, a novel technique utilizing Rayleigh convection was applied, and its ability to enhance photocatalytic water splitting rates was evaluated. Higher Rayleigh convective flow rates resulted in higher photocatalytic water splitting rates. Utilization of Rayleigh convection approximately doubled the photocatalytic water splitting rates, despite relatively low convective flow velocities (obtained through simple thermo-hydrodynamic simulations). The rate enhancement achieved through Rayleigh convection is a result of its ability to disperse the ultrafine Pt/TiO2 particles throughout the whole medium, leading to volumetric reactions.
Databáze:	OpenAIRE
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