Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes

Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes

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 cry...

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Main Authors: Xin Zhou, Nikita Denisov, Gihoon Cha, Imgon Hwang, Patrik Schmuki
Format: Article
Language:English
Published: Elsevier 2021-03-01
Series:Electrochemistry Communications
Subjects:
TiO2 nanotubes
VE-anatase layers
IPCE
IMPS
Photocurrent transients
Online Access:http://www.sciencedirect.com/science/article/pii/S1388248121000217
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spelling doaj-82e5f698c84d42afa4868dca47610abb2021-03-11T04:24:17ZengElsevierElectrochemistry Communications1388-24812021-03-01124106937Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodesXin Zhou0Nikita Denisov1Gihoon Cha2Imgon Hwang3Patrik Schmuki4Department of Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, GermanyDepartment of Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, GermanyDepartment of Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, GermanyDepartment of Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, GermanyDepartment of Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany; Chemistry Department, King Abdulaziz University, 80203 Jeddah, Saudi Arabia; Palacky University, Listopadu 50A, 772 07 Olomouc, Czech Republic; Corresponding author at: Department of Materials Science and Engineering, WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany.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.http://www.sciencedirect.com/science/article/pii/S1388248121000217TiO2 nanotubesVE-anatase layersIPCEIMPSPhotocurrent transients
collection DOAJ
language English
format Article
sources DOAJ
author Xin Zhou
Nikita Denisov
Gihoon Cha
Imgon Hwang
Patrik Schmuki
spellingShingle Xin Zhou
Nikita Denisov
Gihoon Cha
Imgon Hwang
Patrik Schmuki
Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes
Electrochemistry Communications
TiO2 nanotubes
VE-anatase layers
IPCE
IMPS
Photocurrent transients
author_facet Xin Zhou
Nikita Denisov
Gihoon Cha
Imgon Hwang
Patrik Schmuki
author_sort Xin Zhou
title Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes
title_short Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes
title_full Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes
title_fullStr Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes
title_full_unstemmed Photoelectrochemical performance of TiO2 photoanodes: Nanotube versus nanoflake electrodes
title_sort photoelectrochemical performance of tio2 photoanodes: nanotube versus nanoflake electrodes
publisher Elsevier
series Electrochemistry Communications
issn 1388-2481
publishDate 2021-03-01
description 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.
topic TiO2 nanotubes
VE-anatase layers
IPCE
IMPS
Photocurrent transients
url http://www.sciencedirect.com/science/article/pii/S1388248121000217
work_keys_str_mv AT xinzhou photoelectrochemicalperformanceoftio2photoanodesnanotubeversusnanoflakeelectrodes
AT nikitadenisov photoelectrochemicalperformanceoftio2photoanodesnanotubeversusnanoflakeelectrodes
AT gihooncha photoelectrochemicalperformanceoftio2photoanodesnanotubeversusnanoflakeelectrodes
AT imgonhwang photoelectrochemicalperformanceoftio2photoanodesnanotubeversusnanoflakeelectrodes
AT patrikschmuki photoelectrochemicalperformanceoftio2photoanodesnanotubeversusnanoflakeelectrodes
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