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Journal of Materials Science: Materials in Electronics

, Volume 29, Issue 21, pp 18388–18396 | Cite as

Novel one-step fabrication of highly ordered Mo-doped TiO2 nanotubes arrays with enhanced visible light catalytic activity

  • Jie Zhou
  • Bo Feng
  • Xiong Lu
  • Ke Duan
Article
  • 78 Downloads

Abstract

Doping with transition metals has been established as a promising approach for extending the absorption spectrum of TiO2 to the visible light region for enhancing its photocatalytic (PC) activity under visible light illumination. In this work, highly ordered Mo-doped TiO2 nanotubes arrays (Mo-TNTs) were fabricated by a facile in situ anodization of Ti in ethylene glycol/fluoride electrolyte using sodium molybdate as the molybdenum source. The doping levels (0.13–1.51 at.%) of Mo were conveniently adjusted by varying the initial concentrations of sodium molybdate and ammonium fluoride in the electrolyte. Various characterizations were performed to investigate the morphologies, crystal phases, elements’ valence states of the as-prepared samples. Results indicated that Mo6+ ions were successfully introduced into the lattice of anatase TiO2, forming isostructural substitution of Ti4+. Compared with undoped TNTs, the Mo-TNTs exhibited the obvious extension of absorption spectra to the visible light region, higher photoelectric conversion efficiency and lower recombination of photogenerated carriers. Meanwhile, their photoelectrochemical properties were also significantly affected by the doping level of Mo. Of all samples, 6Mo-TNTs (0.82 at.% Mo) showed the best photoelectrochemical performance and highest PC activity under visible light. This was mainly attributed to the synergetic contributions of the enhanced visible light absorption and suppressed recombination.

Notes

Acknowledgements

This work is under the support of National Key Research and Development Program of China (2017YFB0702602), the National Natural Science Foundation of China (31570955) and the Fundamental Research Funds for the Central Universities (2682017CX075).

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduPeople’s Republic of China

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