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Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes

Authors :
Xin Zhou
Nikita Denisov
Gihoon Cha
Imgon Hwang
Patrik Schmuki
Source :
Electrochemistry Communications, Vol 124, Iss , Pp 106937- (2021)
Publication Year :
2021
Publisher :
Elsevier, 2021.

Abstract

In the present work, we compare the photoresponse of vertically erected (VE) single crystal anatase layers with that of widely used TiO2 nanotube layers. These VE-anatase layers were grown hydrothermally, directly on fluorine-doped tin oxide (FTO) glass, and consist of an array of anatase single crystal flakes with preferred (001) facets. As formed, these single crystal layers are fluorine terminated – this termination can be removed by a thermal treatment in air. We compare the photocurrent magnitude and photocurrent transients using intensity-modulated photocurrent spectroscopy (IMPS). We find that the “de-fluorinated” VE-anatase layers show significantly higher photocurrents than the comparable nanotube layers. This high efficiency of the VE-anatase layers is due to the electron transport being 100 times faster in these single crystal electrodes, provided that the blocking fluorine termination is removed.

Details

Language :
English
ISSN :
13882481
Volume :
124
Issue :
106937-
Database :
Directory of Open Access Journals
Journal :
Electrochemistry Communications
Publication Type :
Academic Journal
Accession number :
edsdoj.82e5f698c84d42afa4868dca47610abb
Document Type :
article
Full Text :
https://doi.org/10.1016/j.elecom.2021.106937