Role of central metal ions in hematoporphyrin-functionalized titania in solar energy conversion dynamics

Samim Sardar, Soumik Sarkar, Myo Tay Zar Myint, Salim Al-Harthi, Joydeep Dutta, Samir Kumar Pal

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

In this study, we have investigated the efficacy of electron transfer processes in hematoporphyrin (HP) and iron hematoporphyrin ((Fe)HP) sensitized titania as potential materials for capturing and storing solar energy. Steady-state and picosecond-resolved fluorescence studies show the efficient photoinduced electron transfer processes in hematoporphyrin-TiO2 (HP-TiO2) and Fe(iii)-hematoporphyrin-TiO2 (Fe(iii)HP-TiO2) nanohybrids, which reveal the role of central metal ions in electron transfer processes. The bidentate covalent attachment of HP onto TiO2 particulates is confirmed by FTIR, Raman scattering and X-ray photoelectron spectroscopy (XPS) studies. The iron oxidation states and the attachment of iron to porphyrin through pyrrole nitrogen atoms were investigated by cyclic voltammetry and FTIR studies, respectively. We also investigated the potential application of HP-TiO2 and Fe(iii)HP-TiO2 nanohybrids for the photodegradation of a model organic pollutant methylene blue (MB) in aqueous solution under wavelength dependent light irradiation. To further investigate the role of iron oxidation states in electron transfer processes, photocurrent measurements were done by using Fe(iii) and Fe(ii) ions in porphyrin. This work demonstrates the role of central metal ions in fundamental electron transfer processes in porphyrin sensitized titania and their implications for dye-sensitized device performance.

Original languageEnglish
Pages (from-to)18562-18570
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number42
DOIs
Publication statusPublished - Nov 14 2013

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Hematoporphyrins
solar energy conversion
Energy conversion
Solar energy
Metal ions
metal ions
electron transfer
titanium
porphyrins
iron
Porphyrins
attachment
Iron
Electrons
oxidation
methylene blue
solar energy
pyrroles
nitrogen atoms
particulates

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Role of central metal ions in hematoporphyrin-functionalized titania in solar energy conversion dynamics. / Sardar, Samim; Sarkar, Soumik; Myint, Myo Tay Zar; Al-Harthi, Salim; Dutta, Joydeep; Pal, Samir Kumar.

In: Physical Chemistry Chemical Physics, Vol. 15, No. 42, 14.11.2013, p. 18562-18570.

Research output: Contribution to journalArticle

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