Improved photoelectrocatalytic properties of Ti-doped BiFeO3 films for water oxidation
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Because of the potential application in photoelectrochemical cells for water splitting, the synthesis of BiFeO3 (BFO) is receiving increasing attention. A simple, low-cost drop-casting route was used to synthesize Ti ions doped BiFeO3 thin films and the effects of the Ti ions doping on their crystal structure, morphology, and photoelectrocatalytic activity had been studied. X-ray diffraction results of Ti-BFO films showed that the doping of Ti ions lead to the distortion of crystal structure. Photoelectrochemical measurements indicated that the photoelectrocatalytic activities of BFO film doped with 5 % Ti ions showed the best performance. The UV–Vis absorption spectra of Ti-BFO films showed that the absorption wavelength of BFO doped with 5 % Ti had obvious shift and the band gap decreased. From the results of Mott–Schottky (M–S) plots, we calculated the positions of valence band (VB) and conduction band (CB) for Ti-BFO film. The outcomes showed that the band gap structure of BFO samples doped with 5 % Ti had more positive CB and more negative VB. The calculated photogenic charge carrier concentrations of BFO and Ti (0.05)-BFO were 5.07 × 1019 and 6.32 × 1019 cm−3, respectively. The reduced band gap and increased photogenic charge carrier concentration are the major factors contributing to the enhancement of photoelectrocatalytic performances of Ti-BFO films.
KeywordsBiFeO3 BiVO4 Water Oxidation Photogenic Charge Carrier BiFeO3 Film
This work was supported by the Chongqing University Postgraduates’ Innovation Project (2015) and the sharing of Chongqing University’s large-scale equipment.
- 27.Moniz SJA, Blackman CS, Southern P, Weaver PM, Tang JW, Carmalt JC (2015) Visible-light driven water splitting over BiFeO3 photoanodes grownviathe LPCVD reaction of [Bi(OtBu)3] and [Fe(OtBu)3]2 and enhanced with a surface nickel oxygen evolution catalyst. Nanoscale 7:16343–16353CrossRefGoogle Scholar
- 35.Liu J, Fang L, Zheng FG, Ju S, Shen MR (2009) Enhancement of magnetization in Eu doped BiFeO3 nanoparticles. Appl Phys Lett 95:022511–022511–022511–022513Google Scholar
- 46.Chen SW, Huang MJ, Lin PA, Jeng HT, Lee JM, Haw SC, Chen SA, Lin HJ, Lu KT, Chen DP, Dou SX, Wang XL, Chen JM (2013) Orbital structure of FeTiO3 ilmenite investigated with polarization-dependent X-ray absorption spectroscopy and band structure calculations. Appl Phys Lett 102:042107CrossRefGoogle Scholar
- 49.Sayama K, Nomura A, Arai T, Sugita T, Abe R, Yanagida M, Oi T, Wasaki YI, Abe Y, Sugihara H (2006) Photoelectrochemical decomposition of water into H2 and O2 on porous BiVO4 thin-film electrodes under visible light and significant effect of Ag ion treatment. J Phys Chem B 110:11352–11360CrossRefGoogle Scholar