Enhancement of photocurrent generation by C 60-encapsulated single-walled carbon nanotubes in ru-sensitized photoelectrochemical cell

Jungwoo Lee, Taehee Park, Jongtaek Lee, Mira Jang, Seungjin Lee, Heesu Kim, Sung-Hwan Han, Whikun Yi

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Abstract

Single-walled carbon nanotubes (SWNTs) and C 60-encapsulated SWNTs (C 60@SWNTs) are introduced to Rusensitized photoelectrochemical cells (PECs), and photocurrents are compared between two cells, i.e., an RuL2(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., β (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.

Original languageEnglish
Pages (from-to)2689-2693
Number of pages5
JournalBulletin of the Korean Chemical Society
Volume33
Issue number8
DOIs
Publication statusPublished - 2012 Aug 20

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Keywords

  • C @SWNTs
  • Electric field
  • Encapsulation
  • PECs
  • Photocurrent

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