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Iron–manganese–titanium (1 : 1 : 2) oxide composite thin films for improved photocurrent efficiency

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Abstract

In continuation of our previous studies on the photoelectrochemical (PEC) properties of titanium-based composite oxide thin films, an effort was made to develop thin films of the 1 : 1 : 2 iron–manganese–titanium oxide composite, Fe2MnTi3O10–MnTiO3, using Fe(OAc)2 and a bimetallic manganese–titanium complex, [Mn2Ti4(TFA)8(THF)6(OH)4(O)2]·0.4THF (1), where OAc = acetato, TFA = trifluoroacetato, and THF = tetrahydrofuran by the aerosol-assisted chemical vapour deposition (AACVD) technique. The thin films after their proper characterization with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Mössbauer spectroscopy, field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), energy-dispersive X-ray (EDX) spectroscopy, UV-Vis spectrophotometery and photoluminescence (PL) spectroscopy were tested for their potential applications for the photoelectrochemical oxidation of water. The PEC results revealed that a photocurrent density (Jlight) of 1.88 mA cm−2 was obtained at a low potential of 0.20 V vs. Ag/AgCl/3MKCl inferring a promising photo-conversion efficiency of 1.56%. These observations were further endorsed by electrochemical impedance spectroscopic (EIS) studies in terms of charge transportation and its recombination time. Furthermore, the Mott–Schottky plot indicated a flat band potential of −1.0 V vs. Ag/AgCl.

Graphical abstract: Iron–manganese–titanium (1 [ ] : [ ] 1 [ ] : [ ] 2) oxide composite thin films for improved photocurrent efficiency

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Publication details

The article was received on 14 Feb 2017, accepted on 12 Jun 2017 and first published on 12 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ00513J
Citation: New J. Chem., 2017, Advance Article
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    Iron–manganese–titanium (1 : 1 : 2) oxide composite thin films for improved photocurrent efficiency

    M. A. Mansoor, K. Munawar, S. P. Lim, N.-M. Huang, M. Mazhar, M. J. Akhtar and M. Siddique, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ00513J

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