Hydrothermal synthesis of brookite TiO2 nanoparticles for dye-sensitized solar cell |
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| Authors: | C. G. Ezema A. C. Nwanya B. E. Ezema Malik Maaza P. O. Ukoha F. I. Ezema |
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| Affiliation: | 1.National Centre for Energy Research and Development,University of Nigeria,Nsukka,Nigeria;2.Department of Pure and Industrial Chemistry,University of Nigeria,Nsukka,Nigeria;3.Department of Physics and Astronomy,University of Nigeria,Nsukka,Nigeria;4.Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation,Somerset West,South Africa;5.UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies,University of South Africa (UNISA),Pretoria,South Africa |
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| Abstract: | We obtained Tannin-4-azobenzoic acid (azo dye) by the conventional method of diazotization and coupling of aromatic amines. The properties of the azo dye were characterized via ultraviolet-visible (UV–vis), infrared (IR), and nuclear magnetic resonance (NMR) spectroscopy. Nanocrystalline titanium dioxide (TiO2) thin films were deposited by hydrothermal method onto fluorine-doped tin (IV) oxide (FTO)-coated glass substrate at 353 K for 4 h. The as-deposited and annealed films were characterized for structural, morphological, optical, thickness, and wettability properties. The synthesized metal free azo dye was used to sensitize the prepared TiO2 thin film with thickness of 26 μm. The photoelectrochemical (PEC) performance of TiO2 sensitized with the azo dye was evaluated in polyiodide (0.1 M KI + 0.01 M I2 + 0.1 M KCl) electrolyte at 40 mW cm?2 illumination intensity. The cell yielded a short circuit current of 2.82 mA, open circuit voltage of 314.3 mV, a fill factor of 0.30, and a photovoltaic conversion efficiency value of 0.64%. |
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