Synthesis of 2D anatase TiO2 with Highly Reactive Facets by Fluorine-free Topochemical Conversion of 1T-TiS2 nanosheets

Marco Zarattini, Chaochao Dun, Liam Isherwood, Alexandre Felten, Jonathan Filippi, Madeleine P. Gordon, Linfei Zhang, Omar Kassem, Xiuju Song, Wenjing Zhang, Robert Ionescu, Jarrid A. Wittkopf, Aliaksandr Baidak, Helen Holder, Carlo Santoro, Alessandro Lavacchi, Jeffrey J. Urban, Cinzia Casiraghi

Research output: Contribution to journalArticlepeer-review


Two-dimensional (2D) anatase titanium dioxide (TiO2) is expected to exhibit different properties as compared to anatase nanocrystallites, due to its highly reactive exposed facets. However, access to 2D anatase TiO2 is limited by the non-layered nature of the bulk crystal, which does not allow to use top-down chemical exfoliation. Large effort has been dedicated to the growth of 2D anatase TiO2 with high reactive facets by bottom-up approaches, which relies on the use of harmful chemical reagents. Here, we demonstrate a novel fluorine-free strategy based on topochemical conversion of 2D 1T-TiS2 for the production of single crystalline 2D anatase TiO2, exposing the {001} facet on top and bottom and {100} at the sides of the nanosheet. The exposure of these faces, with no additional defects or doping, gives rise to a significant activity enhancement in the hydrogen evolution reaction, as compared to commercially available Degussa P25 TiO2 nanoparticles.
Because of the strong potential of TiO2 in many energy-based applications, our topochemical approach offers a low cost, green and mass scalable route for production of highly crystalline anatase TiO2 with well controlled and highly reactive exposed facets.
Original languageEnglish
JournalJournal of Materials Chemistry A
Publication statusAccepted/In press - 27 Oct 2021

Research Beacons, Institutes and Platforms

  • Dalton Nuclear Institute


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