Radiative and Non-Radiative Recombination Pathways in Mixed-Phase TiO2 Nanotubes for PEC Water-Splitting

Journal article


Publication Details

Author(s): Yalavarthi R, Naldoni A, Kment S, Mascaretti L, Kmentova H, Tomanec O, Schmuki P, Zboril R
Journal: Catalysts
Publication year: 2019
Volume: 9
Journal issue: 2
ISSN: 2073-4344


Abstract

Anatase and rutile mixed-phase TiO2 with an ideal ratio has been proven to significantly enhance photoelectrochemical (PEC) activity in water-splitting applications due to suppressing the electron-hole recombination. However, the mechanism of this improvement has not been satisfactory described yet. The PEC water oxidation (oxygen evolution) at the interface of TiO2 photoanode and electrolyte solution is determined by the fraction of the photogenerated holes that reach the solution and it is defined as the hole transfer efficiency. The surface and bulk recombination processes in semiconductor photoanodes majorly influence the hole transfer efficiency. In this work, we study the hole transfer process involved in mixed-phase TiO2 nanotube arrays/solution junction using intensity-modulated photocurrent and photovoltage spectroscopy (IMPS and IMVS); then, we correlate the obtained hole transfer rate constants to (photo)electrochemical impedance spectroscopy (PEIS) measurements. The results suggest that the enhanced performance of the TiO2 mixed-phase is due to the improved hole transfer rate across the TiO2/liquid interface as well as to the decrease in the surface trap recombination of the holes.


FAU Authors / FAU Editors

Schmuki, Patrik Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)


External institutions with authors

Palacky University Olomouc / Univerzita Palackého v Olomouci


How to cite

APA:
Yalavarthi, R., Naldoni, A., Kment, S., Mascaretti, L., Kmentova, H., Tomanec, O.,... Zboril, R. (2019). Radiative and Non-Radiative Recombination Pathways in Mixed-Phase TiO2 Nanotubes for PEC Water-Splitting. Catalysts, 9(2). https://dx.doi.org/10.3390/catal9020204

MLA:
Yalavarthi, Rambabu, et al. "Radiative and Non-Radiative Recombination Pathways in Mixed-Phase TiO2 Nanotubes for PEC Water-Splitting." Catalysts 9.2 (2019).

BibTeX: 

Last updated on 2019-26-03 at 07:38