Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Enhancement of Photocurrent Generation by C60-encapsulated Single-walled Carbon Nanotubes in Ru-sensitized Photoelectrochemical Cell

  • Lee, Jung-Woo (Department of Chemistry and Research Institute for Natural Science, Hanyang University) ;
  • Park, Tae-Hee (Department of Chemistry and Research Institute for Natural Science, Hanyang University) ;
  • Lee, Jong-Taek (Department of Chemistry and Research Institute for Natural Science, Hanyang University) ;
  • Jang, Mi-Ra (Department of Chemistry and Research Institute for Natural Science, Hanyang University) ;
  • Lee, Seung-Jin (Department of Chemistry and Research Institute for Natural Science, Hanyang University) ;
  • Kim, Hee-Su (Department of Chemistry and Research Institute for Natural Science, Hanyang University) ;
  • Han, Sung-Hwan (Department of Chemistry and Research Institute for Natural Science, Hanyang University) ;
  • Yi, Whi-Kun (Department of Chemistry and Research Institute for Natural Science, Hanyang University)
  • Received : 2012.03.09
  • Accepted : 2012.05.14
  • Published : 2012.08.20
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Abstract

Single-walled carbon nanotubes (SWNTs) and $C_{60}$-encapsulated SWNTs ($C_{60}@SWNTs$) are introduced to Ru-sensitized photoelectrochemical cells (PECs), and photocurrents are compared between two cells, i.e., an $RuL_2(NCS)_2$/DAPV/SWNTs/ITO cell and an $RuL_2(NCS)_2$/DAPV/$C_{60}@SWNTs$/ITO cell. [L = 2,2'-bipyridine-4,4'-dicarboxylic acid, DAPV = di-(3-aminopropyl)-viologen, and ITO = indium-tin oxide] The photocurrents are increased by 70.6% in the presence of $C_{60}@SWNTs$. To explain the photocurrent increase, the reverse-field emission method is used, i.e., $RuL_2(NCS)_2$/DAPV/SWNTs/ITO cell (or $RuL_2(NCS)_2$/DAPV/$C_{60}@SWNTs$/ITO cell) as an anode and a counter electrode Pt as a cathode in the external electric field. The improved field emission properties, i.e., ${\beta}$ (field enhancement factor) and emission currents in the reverse-field emission with $C_{60}@SWNTs$ indicate the enhancement of the PEC electric field, which implies the improvement of the electron transfer rate along with the reduced charge recombination in the cell.

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References

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