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α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting

Hyungkyu Han, Francesca Riboni, Frantisek Karlicky, Stepan Kment, Anandarup Goswami, Sudhagar Pitchaimuthu Orcid Logo, Jeongeun Yoo, Lei Wang, Ondrej Tomanec, Martin Petr, Ondrej Haderka, Chiaki Terashima, Akira Fujishima, Patrik Schmuki, Radek Zboril

Nanoscale, Volume: 9, Issue: 1, Pages: 134 - 142

Swansea University Author: Sudhagar Pitchaimuthu Orcid Logo

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DOI (Published version): 10.1039/c6nr06908h

Abstract

We report the fabrication of 3D hierarchical hetero-nanostructures composed of thin α-Fe2O3 nanoflakes branched on TiO2 nanotubes. The novel α-Fe2O3/TiO2 hierarchical nanostructures, synthesized on FTO through a multi-step hydrothermal process, exhibit enhanced performances in photo-electrochemical...

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Published in: Nanoscale
ISSN: 2040-3364 2040-3372
Published: Royal Society of Chemistry (RSC) 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa55890
first_indexed 2020-12-15T14:58:04Z
last_indexed 2021-09-25T03:18:12Z
id cronfa55890
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spelling 2021-09-24T15:29:56.7540232 v2 55890 2020-12-15 α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting 2fdbee02f4bfc5a1b174c8bd04afbd2b 0000-0001-9098-8806 Sudhagar Pitchaimuthu Sudhagar Pitchaimuthu true false 2020-12-15 We report the fabrication of 3D hierarchical hetero-nanostructures composed of thin α-Fe2O3 nanoflakes branched on TiO2 nanotubes. The novel α-Fe2O3/TiO2 hierarchical nanostructures, synthesized on FTO through a multi-step hydrothermal process, exhibit enhanced performances in photo-electrochemical water splitting and in the photocatalytic degradation of an organic dye, with respect to pure TiO2 nanotubes. An enhanced separation of photogenerated charge carriers is here proposed as the main factor for the observed photo-activities: electrons photogenerated in TiO2 are efficiently collected at FTO, while holes are transferred to the α-Fe2O3 nanobranches that serve as charge mediators to the electrolyte. The morphology of α-Fe2O3 that varies from ultrathin nanoflakes to nanorod/nanofiber structures depending on the Fe precursor concentration was shown to have a significant impact on the photo-induced activity of the α-Fe2O3/TiO2 composites. In particular, it is shown that for an optimized photo-electrochemical structure, a combination of critical factors should be achieved such as (i) TiO2 light absorption and photo-activation vs. α-Fe2O3-induced shadowing effect and (ii) the availability of free TiO2 surface vs. α-Fe2O3-coated surface. Finally, theoretical analysis, based on DFT calculations, confirmed the optical properties experimentally determined for the α-Fe2O3/TiO2 hierarchical nanostructures. We anticipate that this new multi-step hydrothermal process can be a blueprint for the design and development of other hierarchical heterogeneous metal oxide electrodes suitable for photo-electrochemical applications. Journal Article Nanoscale 9 1 134 142 Royal Society of Chemistry (RSC) 2040-3364 2040-3372 1 1 2017 2017-01-01 10.1039/c6nr06908h COLLEGE NANME COLLEGE CODE Swansea University 2021-09-24T15:29:56.7540232 2020-12-15T08:47:46.5086599 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Hyungkyu Han 1 Francesca Riboni 2 Frantisek Karlicky 3 Stepan Kment 4 Anandarup Goswami 5 Sudhagar Pitchaimuthu 0000-0001-9098-8806 6 Jeongeun Yoo 7 Lei Wang 8 Ondrej Tomanec 9 Martin Petr 10 Ondrej Haderka 11 Chiaki Terashima 12 Akira Fujishima 13 Patrik Schmuki 14 Radek Zboril 15
title α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting
spellingShingle α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting
Sudhagar Pitchaimuthu
title_short α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting
title_full α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting
title_fullStr α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting
title_full_unstemmed α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting
title_sort α-Fe2O3/TiO23D hierarchical nanostructures for enhanced photoelectrochemical water splitting
author_id_str_mv 2fdbee02f4bfc5a1b174c8bd04afbd2b
author_id_fullname_str_mv 2fdbee02f4bfc5a1b174c8bd04afbd2b_***_Sudhagar Pitchaimuthu
author Sudhagar Pitchaimuthu
author2 Hyungkyu Han
Francesca Riboni
Frantisek Karlicky
Stepan Kment
Anandarup Goswami
Sudhagar Pitchaimuthu
Jeongeun Yoo
Lei Wang
Ondrej Tomanec
Martin Petr
Ondrej Haderka
Chiaki Terashima
Akira Fujishima
Patrik Schmuki
Radek Zboril
format Journal article
container_title Nanoscale
container_volume 9
container_issue 1
container_start_page 134
publishDate 2017
institution Swansea University
issn 2040-3364
2040-3372
doi_str_mv 10.1039/c6nr06908h
publisher Royal Society of Chemistry (RSC)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
active_str 0
description We report the fabrication of 3D hierarchical hetero-nanostructures composed of thin α-Fe2O3 nanoflakes branched on TiO2 nanotubes. The novel α-Fe2O3/TiO2 hierarchical nanostructures, synthesized on FTO through a multi-step hydrothermal process, exhibit enhanced performances in photo-electrochemical water splitting and in the photocatalytic degradation of an organic dye, with respect to pure TiO2 nanotubes. An enhanced separation of photogenerated charge carriers is here proposed as the main factor for the observed photo-activities: electrons photogenerated in TiO2 are efficiently collected at FTO, while holes are transferred to the α-Fe2O3 nanobranches that serve as charge mediators to the electrolyte. The morphology of α-Fe2O3 that varies from ultrathin nanoflakes to nanorod/nanofiber structures depending on the Fe precursor concentration was shown to have a significant impact on the photo-induced activity of the α-Fe2O3/TiO2 composites. In particular, it is shown that for an optimized photo-electrochemical structure, a combination of critical factors should be achieved such as (i) TiO2 light absorption and photo-activation vs. α-Fe2O3-induced shadowing effect and (ii) the availability of free TiO2 surface vs. α-Fe2O3-coated surface. Finally, theoretical analysis, based on DFT calculations, confirmed the optical properties experimentally determined for the α-Fe2O3/TiO2 hierarchical nanostructures. We anticipate that this new multi-step hydrothermal process can be a blueprint for the design and development of other hierarchical heterogeneous metal oxide electrodes suitable for photo-electrochemical applications.
published_date 2017-01-01T14:02:26Z
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