Facet-dependent interfacial and photoelectrochemical properties of TiO2 nanoparticles

Zabara, Mohammed Ahmed and Yarar Kaplan, Begüm and Alkan Gürsel, Selmiye and Yürüm, Alp (2023) Facet-dependent interfacial and photoelectrochemical properties of TiO2 nanoparticles. Advanced Materials Interfaces . ISSN 2196-7350 Published Online First https://dx.doi.org/10.1002/admi.202300555

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The photoelectrochemical properties of titanium dioxide (TiO2) nanoparticles are directly related to the presence of certain facets. The synthesis of such particles is challenged using volatile and sensitive precursors utilizing shape capping agents. In this study, an easier two-step synthesis technique for the preparation of well-specified morphology TiO2 nanocrystals from TiO2 powder is demonstrated. The facet-dependent Fermi level and flat band potential of the prepared particles are calculated and their photoelectrochemical properties are investigated by Cu2+ and Pb2+ photo/electrodeposition. From Cu2+ electrodeposition, it is shown that the presence of {100} and {001} facets in cubic morphology facilitates the electrodeposition with progressive nucleation mechanisms, while the presence of {101} facet in octahedral geometry follows instantaneous nucleation mechanisms. The activity of electroreduction is also related to the flat-band potential which shows the highest activity in Pb2+ electrodeposition for octahedron nanostructure due to the alignment of the reduction potential to the edge of the flat band. Photodeposition of Cu2+ and Pb2+ ions shows identical trends to electrodeposition indicating the facets influence in ion adsorption and structure of the bandgap of morphological TiO2. The findings emphasize the importance of facet-dependent surface adsorption and bandgap structure designing faceted TiO2 nanoparticles for tailored applications.
Item Type: Article
Uncontrolled Keywords: anatase; exposed facets; flat-band potential; interface; photoreduction; TiO2; titanate
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Alp Yürüm
Date Deposited: 07 Aug 2023 21:50
Last Modified: 07 Aug 2023 21:50
URI: https://research.sabanciuniv.edu/id/eprint/47582

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