Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 10, Issue 37, Pages 19994-20004Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta03239b
Keywords
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Funding
- national project NovaCO2 - MCIN/AEI [PID2020-118593RB-C22]
- regional project FotoArt-CM - Comunidad de Madrid [S2018/NMT-4367]
- Spanish MICINN the Juan de la Cierva Incorporacion grant [IJC2019 - 042430 -I]
- national project Nhympha - MCIN/AEI [PID2019-106315RB-I00]
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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.
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.
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