Nano-TiO<sub>2</sub>/TiN Systems for Electrocatalysis: Mapping the Changes in Energy Band Diagram across the Semiconductor|Current Collector Interface and the Study of Effects of TiO<sub>2</sub> Electrochemical Reduction Using UV Photoelectron Spectroscopy

de la Fuente, Beatriz; Khurana, Divyansh. A.; Vereecken, Philippe M.; Hubin, Annick; Hauffman, Tom

doi:10.1021/acsami.4c09736

ACS Appl. Mater. Interfaces

2024

DOI: 10.1021/acsami.4c09736

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Nano-TiO₂/TiN Systems for Electrocatalysis: Mapping the Changes in Energy Band Diagram across the Semiconductor|Current Collector Interface and the Study of Effects of TiO₂ Electrochemical Reduction Using UV Photoelectron Spectroscopy

Beatriz de la Fuente,

Divyansh. A. Khurana,

Philippe M. Vereecken

et al.

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2024

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Cited by 2 publications

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Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum

Khurana,

Plankensteiner,

Vermang

et al. 2024

Angewandte Chemie

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Knowing the exact location of the semiconductor band‐edges is key for mechanistic insights into their use for water and CO2 photo/electrocatalysis. In this regard, a reliable strategy for nano‐semiconductors did not exist yet. We demonstrate the use of reversible redox probes on nano‐semiconductor electrodes to determine their band‐edge locations in aqueous solutions. Rectifying current‐potential (i‐U) characteristics with the high work function Fe(CN)63‐/Fe(CN)64‐ redox couple yielded the exact flatband potential at various pH whereas the reversible i‐U characteristics with the low work function Ru(NH3)63+/Ru(NH3)62+ redox couple provided the conduction band‐edge location and dopant concentration for a 30nm thin‐film n‐TiO2. The methodology can be extended to other nano‐semiconductors and serves as an alternative to and goes beyond the capabilities of the Mott‐Schottky procedure for bulk semiconductor electrodes.

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Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum

Khurana,

Plankensteiner,

Vermang

et al. 2024

Angewandte Chemie

View full text Add to dashboard Cite

show abstract

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum

Khurana,

Plankensteiner,

Vermang

et al. 2024

Angew Chem Int Ed

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Nano-TiO₂/TiN Systems for Electrocatalysis: Mapping the Changes in Energy Band Diagram across the Semiconductor|Current Collector Interface and the Study of Effects of TiO₂ Electrochemical Reduction Using UV Photoelectron Spectroscopy

Cited by 2 publications

References 56 publications

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum

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Nano-TiO2/TiN Systems for Electrocatalysis: Mapping the Changes in Energy Band Diagram across the Semiconductor|Current Collector Interface and the Study of Effects of TiO2 Electrochemical Reduction Using UV Photoelectron Spectroscopy

Cited by 2 publications

References 56 publications

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO2 Thin‐Films: Settling the Mott‐Schottky Conundrum

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO2 Thin‐Films: Settling the Mott‐Schottky Conundrum

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO2 Thin‐Films: Settling the Mott‐Schottky Conundrum

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Nano-TiO₂/TiN Systems for Electrocatalysis: Mapping the Changes in Energy Band Diagram across the Semiconductor|Current Collector Interface and the Study of Effects of TiO₂ Electrochemical Reduction Using UV Photoelectron Spectroscopy

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum

Reversible Redox Probes to Determine Band‐Edge Locations and Dopant Concentrations of Nano‐TiO₂ Thin‐Films: Settling the Mott‐Schottky Conundrum