A molybdenum dithiolene complex as a potential photosensitiser for photoelectrochemical cells

Wun Fui Mark-Lee, Kim Hang Ng, Lorna Effery Minggu, Ali Umar Akrajas, Mohammad Kassim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Molybdenum dithiolene complexes with the general formula [MoTp*(NO)(L)], where Tp* = tris(3,5-dimethylpyrazolyl)hydroborate and L = toluene-3,4-dithiolate (L1), 1,2-benzenedithiolate (L2), or 3,6-dichloro-1,2-benzenedithiolate (L3), were found to exhibit the chemical and physical properties required for a photosensitiser in a photoelectrochemical cell. These complexes were characterised using micro-elemental, spectroscopic (IR and UV-vis) and electrochemical analyses. Cyclic voltammetry (CV) was used to determine the oxidation/reduction potentials and to calculate the energy band gap. All of the complexes had an energy band gap in the range 1.45-1.48 eV, which extends far into the visible light region. A TiO2 thin film to be used as a photoanode for photoelectrochemical cells was prepared using the paste technique on a Fluorine-doped Tin Oxide (FTO) plate and characterised using scanning electron microscope (SEM) and X-ray diffractometer (XRD). The [MoTp*(NO)(L)]-doped TiO2 photoanodes were analysed photochemically in a 1.0 M NaOH electrolyte solution using SCE reference and platinum counterelectrodes. The [MoTp*(NO)(L3)]-doped TiO2 photoanode exhibited an increased photoinduced current compared with the undoped TiO2 photoanode. The Cl atoms on the dithiolene group offered a better interaction between the photosensitiser molecule and the TiO2 photocatalyst by providing a means for halogen atom-induced chemical bonding. Based on the band edge calculations and the subsequent photocurrent results, these complexes may be potential photosensitisers for use in the preparation of photoelectrodes for photoelectrochemical cells.

Original languageEnglish
Pages (from-to)9578-9584
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number22
DOIs
Publication statusPublished - 26 Jul 2013

Fingerprint

Photoelectrochemical cells
Photosensitizers
Molybdenum
molybdenum
Band structure
energy bands
Energy gap
cells
Atoms
Diffractometers
Photocatalysts
Tin oxides
Photocurrents
diffractometers
Fluorine
chemical properties
halogens
Chemical properties
tin oxides
Cyclic voltammetry

Keywords

  • Band gap
  • Molybdenum dithiolene
  • Photoelectrochemical cell
  • Photosensitiser
  • tris(3,5-dimethylpyrazolyl) hydroborate

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

A molybdenum dithiolene complex as a potential photosensitiser for photoelectrochemical cells. / Mark-Lee, Wun Fui; Ng, Kim Hang; Effery Minggu, Lorna; Akrajas, Ali Umar; Kassim, Mohammad.

In: International Journal of Hydrogen Energy, Vol. 38, No. 22, 26.07.2013, p. 9578-9584.

Research output: Contribution to journalArticle

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