Carbon nanotube-enhanced photoelectrochemical properties of metallo-octacarboxyphthalocyanines

Nonhlanhla E. Mphahlele, Lukas Le Roux, Charl J. Jafta, Leskey Cele, Mkhulu K. Mathe, Tebello Nyokong, Nagao Kobayashi, Kenneth I. Ozoemena

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The photoelectrochemistry of metallo-octacarboxyphthalocyanines (MOCPc, where M = Zn or Si(OH)2) integrated with MWCNTs for the development of dye-sensitized solar cells (DSSCs) is reported. The DSSC performance (obtained from the photo-chronoamperometric and photo-impedimetric data) decreased as ZnOCPc > (OH)2SiOCPc. The incorporation of the MWCNTs on the surface of the TiO2 film (MOCPc-MWCNT systems) gave higher photocurrent density than the bare MOCPc complexes. Also, from the EIS results, the MOCPc-MWCNT hybrids gave faster charge transport kinetics (approximately three times faster) compared to the bare MOCPc complexes. The electron lifetime was slightly longer (ca. 6 ms) at the ZnOCPc systems than at the (OH) 2SiOCPc system (ca. 4 ms) meaning that the presence of the MWCNTs on the surface of the TiO2 film did not show any significant improvement on preventing charge recombination process.

Original languageEnglish
Pages (from-to)340-346
Number of pages7
JournalJournal of Materials Science
Volume49
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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