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

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.

Automated summary

Nb-doped TiO2 nanocrystals possess the ability to selectively modulate optical transmittance in the visible and near infrared regions, with two independent electrochemical charging processes. In situ X-ray absorption spectroscopy study reveals the effective reduction of doped anatase and significant reduction of Nb5+ dopant to Nb4+ under electrochemical reaction conditions. Electrochemical impedance spectroscopy and in situ spectroelectrochemistry shed light on the dual charge accumulation processes occurring in these nanocrystals.