文章基本信息

标题：Enhancement of Photocatalytic Water Splitting Rate via Rayleigh Convection
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作者：Seiichi Deguchi ; Ben Kariya ; Norifumi Isu 等
期刊名称：Green and Sustainable Chemistry
印刷版ISSN：2160-6951
电子版ISSN：2160-696X
出版年度：2014
卷号：04
期号：02
页码：80-86
DOI：10.4236/gsc.2014.42012
语种：English
出版社：Scientific Research Publishing
摘要：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.
关键词：Photocatalytic Water Splitting; Pt/TiO2 Powder; Rate Enhancement; Volumetric Reaction; Thermal Treatment; Rayleigh Convection; Thermo-Hydrodynamic Simulation