Staff View: Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications

Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications

A titanium-based heterobimetallic single-source precursor [Y2Ti4(μ3-O)4(μ2-O)3(H2O)(TFA)8(THF)5].3(THF) (1) (where TFA = trifluoroacetato and THF = tetrahydrofuran) was successfully used to fabricate pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films on fluorine-doped tin oxide (FTO) substrate...

Full description

Saved in:

Bibliographic Details
Main Authors:	Munawar, Khadija, Mansoor, Muhammad Adil, Olmstead, Marilyn M., Yusof, Farazila, Misran, Misni, Basirun, Wan Jefrey, Mazhar, Muhammad
Format:	Article
Published:	Springer 2019
Subjects:	QD Chemistry TJ Mechanical engineering and machinery
Online Access:	http://eprints.um.edu.my/23937/ https://doi.org/10.1007/s41779-019-00329-3
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my.um.eprints.23937
record_format	eprints
spelling	my.um.eprints.239372020-03-03T07:43:13Z http://eprints.um.edu.my/23937/ Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications Munawar, Khadija Mansoor, Muhammad Adil Olmstead, Marilyn M. Yusof, Farazila Misran, Misni Basirun, Wan Jefrey Mazhar, Muhammad QD Chemistry TJ Mechanical engineering and machinery A titanium-based heterobimetallic single-source precursor [Y2Ti4(μ3-O)4(μ2-O)3(H2O)(TFA)8(THF)5].3(THF) (1) (where TFA = trifluoroacetato and THF = tetrahydrofuran) was successfully used to fabricate pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films on fluorine-doped tin oxide (FTO) substrates using the aerosol-assisted chemical vapor deposition technique (AACVD). The precursor complex (1), isolated in crystalline form by reacting yttrium (III) acetate monohydrate with titanium (IV) isopropoxide and trifluroacetic acid in THF solution, was characterized by physicochemical methods such as melting point, microanalysis, FT-IR, 1H-NMR, thermogravimetric analyses (TGA/DTG), and single-crystal X-ray diffraction. Thin films prepared at 550 °C were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission gun-scanning electron microscopy (FESEM), and energy-dispersive X-ray spectroscopy (EDX) which demonstrated the development of mesoporous structured microballs of Y2Ti2O7–2TiO2 with precise stoichiometry. The optical analysis showed that Y2Ti2O7–2TiO2 has a direct optical band gap of 1.8 eV. Photo-oxidation of water via Y2Ti2O7–2TiO2 thin films was carried out under simulated solar irradiation of AM 1.5 G (100 mW cm−2) using three-electrode photoelectrochemical cell in of in three separate 0.5 M electrolyte solutions of NaOH (pH = 13.5), Na2SO4 (pH = 7.2), and citrate buffer (pH = 4). A best photocurrent density of ~ 60 μA cm−2 at + 0.8 V vs. SCE was observed at pH of 13.5. These observations were further validated by electrochemical impedance spectroscopy (EIS) studies in terms of charge transportation and its recombination time. © 2019, Australian Ceramic Society. Springer 2019 Article PeerReviewed Munawar, Khadija and Mansoor, Muhammad Adil and Olmstead, Marilyn M. and Yusof, Farazila and Misran, Misni and Basirun, Wan Jefrey and Mazhar, Muhammad (2019) Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications. Journal of the Australian Ceramic Society, 55 (4). pp. 921-932. ISSN 2510-1560 https://doi.org/10.1007/s41779-019-00329-3 doi:10.1007/s41779-019-00329-3
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	QD Chemistry TJ Mechanical engineering and machinery
spellingShingle	QD Chemistry TJ Mechanical engineering and machinery Munawar, Khadija Mansoor, Muhammad Adil Olmstead, Marilyn M. Yusof, Farazila Misran, Misni Basirun, Wan Jefrey Mazhar, Muhammad Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications
description	A titanium-based heterobimetallic single-source precursor [Y2Ti4(μ3-O)4(μ2-O)3(H2O)(TFA)8(THF)5].3(THF) (1) (where TFA = trifluoroacetato and THF = tetrahydrofuran) was successfully used to fabricate pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films on fluorine-doped tin oxide (FTO) substrates using the aerosol-assisted chemical vapor deposition technique (AACVD). The precursor complex (1), isolated in crystalline form by reacting yttrium (III) acetate monohydrate with titanium (IV) isopropoxide and trifluroacetic acid in THF solution, was characterized by physicochemical methods such as melting point, microanalysis, FT-IR, 1H-NMR, thermogravimetric analyses (TGA/DTG), and single-crystal X-ray diffraction. Thin films prepared at 550 °C were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission gun-scanning electron microscopy (FESEM), and energy-dispersive X-ray spectroscopy (EDX) which demonstrated the development of mesoporous structured microballs of Y2Ti2O7–2TiO2 with precise stoichiometry. The optical analysis showed that Y2Ti2O7–2TiO2 has a direct optical band gap of 1.8 eV. Photo-oxidation of water via Y2Ti2O7–2TiO2 thin films was carried out under simulated solar irradiation of AM 1.5 G (100 mW cm−2) using three-electrode photoelectrochemical cell in of in three separate 0.5 M electrolyte solutions of NaOH (pH = 13.5), Na2SO4 (pH = 7.2), and citrate buffer (pH = 4). A best photocurrent density of ~ 60 μA cm−2 at + 0.8 V vs. SCE was observed at pH of 13.5. These observations were further validated by electrochemical impedance spectroscopy (EIS) studies in terms of charge transportation and its recombination time. © 2019, Australian Ceramic Society.
format	Article
author	Munawar, Khadija Mansoor, Muhammad Adil Olmstead, Marilyn M. Yusof, Farazila Misran, Misni Basirun, Wan Jefrey Mazhar, Muhammad
author_facet	Munawar, Khadija Mansoor, Muhammad Adil Olmstead, Marilyn M. Yusof, Farazila Misran, Misni Basirun, Wan Jefrey Mazhar, Muhammad
author_sort	Munawar, Khadija
title	Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications
title_short	Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications
title_full	Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications
title_fullStr	Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications
title_full_unstemmed	Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications
title_sort	pyrochlore-structured y2ti2o7–2tio2 composite thin films for photovoltaic applications
publisher	Springer
publishDate	2019
url	http://eprints.um.edu.my/23937/ https://doi.org/10.1007/s41779-019-00329-3
_version_	1662755200169934848
score	13.211869

Pyrochlore-structured Y2Ti2O7–2TiO2 composite thin films for photovoltaic applications

Similar Items