TY - JOUR
T1 - Synthesis of 2D anatase TiO2 with highly reactive facets by fluorine-free topochemical conversion of 1T-TiS2 nanosheets
AU - Zarattini, Marco
AU - Dun, Chaochao
AU - Isherwood, Liam H.
AU - Felten, Alexandre
AU - Filippi, Jonathan
AU - Gordon, Madeleine P.
AU - Zhang, Linfei
AU - Kassem, Omar
AU - Song, Xiuju
AU - Zhang, Wenjing
AU - Ionescu, Robert
AU - Wittkopf, Jarrid A.
AU - Baidak, Aliaksandr
AU - Holder, Helen
AU - Santoro, Carlo
AU - Lavacchi, Alessandro
AU - Urban, Jeffrey J.
AU - Casiraghi, Cinzia
N1 - Funding Information:
This work is partially supported by the EPSRC in the framework of the CDT Nownano, the ICT project WASP (grant agreement No 825213) and the Grand Challenge EPSRC grant EP/N010345. This work is also partially supported by the Molecular Foundry at Lawrence Berkeley National Laboratory, and User Facilities are supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy (DOE) under Contract No. DE-AC02-05CH11231. M. P. G gratefully acknowledges the National Science Foundation for fellowship support under the National Science Foundation Graduate Research Fellowship Program. C.S. would like to acknowledge the Italian Ministry of Education, Universities and Research (Ministero dell’Istruzione, dell’Università e della Ricerca – MIUR) through the “Rita Levi Montalcini 2018” Fellowship (Grant number PGR18MAZLI). L. F. thanks the Characteristic Innovation Project of Guangdong Provincial Department of Education (No. 2021KTSCX216) and School-level Cultivation Project of Guangdong Polytechnic of Science and Technology (No. XJPY202101).
Publisher Copyright:
© 2022 The Royal Society of Chemistry
PY - 2022/6/21
Y1 - 2022/6/21
N2 - 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 use of top-down chemical exfoliation. Large efforts have 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 the 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.
AB - 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 use of top-down chemical exfoliation. Large efforts have 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 the 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.
UR - http://www.scopus.com/inward/record.url?scp=85133122623&partnerID=8YFLogxK
U2 - 10.1039/d1ta06695a
DO - 10.1039/d1ta06695a
M3 - Article
AN - SCOPUS:85133122623
SN - 2050-7488
VL - 10
SP - 13884
EP - 13894
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 26
ER -