Black Anatase TiO2 Nanotubes with Tunable Orientation for High Performance Supercapacitors

  • Xin Liu
    Xin Liu
    Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway
    More by Xin Liu
  • Patricia Carvalho
    Patricia Carvalho
    Materials Physics, SINTEF Industry, Forskningsveien 1, NO-0373 Oslo, Norway
  • Marit Norderhaug Getz
    Marit Norderhaug Getz
    Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway
  • Truls Norby
    Truls Norby
    Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway
    More by Truls Norby
  • , and 
  • Athanasios Chatzitakis*
    Athanasios Chatzitakis
    Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway
    *E-mail: [email protected]
Cite this: J. Phys. Chem. C 2019, 123, 36, 21931–21940
Publication Date (Web):August 6, 2019
https://doi.org/10.1021/acs.jpcc.9b05070
Copyright © 2019 American Chemical Society
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Abstract

Black TiO2 is a versatile material that finds many applications in the field of photocatalysis but also in energy storage devices, such as supercapacitors. In this work, a new method is developed for the synthesis of black TiO2 in the form of nanotubes. Amorphous TiO2 nanotubes (TNTs) are annealed and reduced in the presence of CaH2, and by a simple manipulation, we are able to obtain control over the preferred crystal orientation. The reduced TNTs show high power and energy densities, as well as unprecedented stability under intensive charge/discharge cycling. The oriented reduced TNTs show metallic-like behavior with improved conductivity when compared to the polycrystalline analogue. This work contributes to the development of highly robust and efficient oxides for electrode material in supercapacitors.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.9b05070.

  • Additional experimental information, electrochemical results, SEM, results concerning TiO2 nanotubes reduced in the presence of SrH2, and the Ragone plot (PDF)

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