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Effect of Surface Treatment of CdS-TiO2 Composite Photocatalysts with Film Type on Hydrogen Production  

Jang, Jum-Suk (Fine & Bio-chemical Process R&D Center, Korea Research Institute of Chemical Technology)
So, Won-Wook (Fine & Bio-chemical Process R&D Center, Korea Research Institute of Chemical Technology)
Kim, Kwang-Je (Fine & Bio-chemical Process R&D Center, Korea Research Institute of Chemical Technology)
Moon, Sang-Jin (Fine & Bio-chemical Process R&D Center, Korea Research Institute of Chemical Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.13, no.1, 2002 , pp. 34-41 More about this Journal
Abstract
CdS and $TiO_2$ nanoparticles were made by the precipitation method and sol-gel method, respectively, and they were mixed mechanically and then treated with the hydrothermal processing. CdS-$TiO_2$ composite particulate films were thus prepared by casting CdS-$TiO_2$ mixed sol onto $SnO_2$ conducting glass and a subsequent heat-treatment at $400^{\circ}C$. Again, the physico-chemical and photoelectrochemical properties of these films were controlled by the surface treatment with $TiCl_4$ aqueous solution. The photocurrents and the hydrogen production rates measured under the present experimental conditions varied in the range of $3.5{\sim}4.5mA/cm^2$ and $0.3{\sim}1.8cc/cm^2$-hr, respectively, and showed the maximum values at the $CdS/[CdS+TiO_2]$ mole ratio of 0.2. Also, the surface treatment with $TiCl_4$ aqueous solution caused a considerable improvement in the photocatalytic activity, Probably as a result of close contacts between the primary particles by the etching effect of $TiCl_4$ It was found that the photoelectrochemical performance of these particulate films could be effectively enhanced by this approach.
Keywords
$TiO_{2}$; Photocatalyst; Photoelectrochemical; Hydrogen production;
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