Photoelectrochemical and Hydrogen Production Characteristics of CdS-TiO2 Nanocomposite Photocatalysts Synthesized in Organic Solvent

유기용매상에서 제조된 수소제조용 CdS-TiO2 나노복합 광촉매의 특성 연구

  • 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)
  • 장점석 (한국화학연구원 정밀 . 생화학공정개발연구센터) ;
  • 소원욱 (한국화학연구원 정밀 . 생화학공정개발연구센터) ;
  • 김광제 (한국화학연구원 정밀 . 생화학공정개발연구센터) ;
  • 문상진 (한국화학연구원 정밀 . 생화학공정개발연구센터)
  • Published : 2002.09.15

Abstract

CdS-$TiO_2$ nano-composite sol was prepared by the sol-gel method in organic solvents at room temperature and further hydrothermal treatment at various temperatures to control the physical properties of the primary particles. Again, CdS-$TiO_2$ composite particulate films were made by casting CdS-$TiO_2$ sols onto $F:SnO_2$ conducting glass and then heat-treatment at $400^{\circ}C$. Physical properties of these 61ms were further controlled by the surface treatment with $TiCl_4$, aqueous solution. The photo currents and hydrogen production rates measured under the experimental conditions varied according to the $CdS/[CdS+TiO_2]$ mole ratio and the mixed-sol preparation method. For $CdS-TiO_2$ composite sols prepared in IPA, CdS particles were homogeneously surrounded by $TiO_2$ particles. 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

Nano-composite;Photocatalyst;$TiO_2$;CdS;Hydrogen production

Acknowledgement

Supported by : 에너지관리공단

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