Issue 37, 2022

Unravelling nanostructured Nb-doped TiO2 dual band behaviour in smart windows by in situ spectroscopies

Abstract

Nb doped TiO2 nanocrystals (NCs) are one of the most attractive candidates for energy-efficient smart window devices due to their ability to provide a selective modulation of the optical transmittance in the visible and near infrared regions. This dual functionality is associated with two independent bulk (polaronic absorption) and surface (plasmonic absorption) electrochemical charging processes. However, there are still some unclear aspects such as the real role of Nb5+ in the electrochemical reduction of anatase TiO2 and the chemical changes experienced by the dopant during this reaction. Herein, a comprehensive in situ X-ray absorption spectroscopy study has been employed to unveil the more effective reduction of the doped anatase and the significant reduction of the Nb5+ dopant to Nb4+ under electrochemical reaction conditions. Additionally, an exhaustive electrochemical impedance spectroscopy and in situ spectroelectrochemistry study on a lab-scale smart window device sheds light on the dual polaronic and plasmonic charge accumulation processes occurring in these NCs during operation.

Graphical abstract: Unravelling nanostructured Nb-doped TiO2 dual band behaviour in smart windows by in situ spectroscopies

Supplementary files

Article information

Article type
Paper
Submitted
21 apr 2022
Accepted
28 jun 2022
First published
04 jul 2022

J. Mater. Chem. A, 2022,10, 19994-20004

Unravelling nanostructured Nb-doped TiO2 dual band behaviour in smart windows by in situ spectroscopies

M. García-Tecedor, G. Gorni, F. Oropeza, L. Gómez, M. Liras, V. A. de la Peña O'Shea and M. Barawi, J. Mater. Chem. A, 2022, 10, 19994 DOI: 10.1039/D2TA03239B

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