Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films

When Ho3+ ions are substituted at Sr2+ sites in SrTiO3 (STO), the excess positive charges are compensated via three complementary routes: (1) strontium vacancies, (2) titanium vacancies, and (3) conduction electrons. In this study, we show that the photoelectrochemical properties of Ho-doped STO fil...

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Main Authors: Dong, Wen, Shen, Mingrong, Wu, Tom, Zheng, Fengang, Zhao, Long, Fang, Liang
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/95776
http://hdl.handle.net/10220/10074
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-957762023-02-28T19:24:39Z Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films Dong, Wen Shen, Mingrong Wu, Tom Zheng, Fengang Zhao, Long Fang, Liang School of Physical and Mathematical Sciences DRNTU::Science::Chemistry::Biochemistry::Spectroscopy When Ho3+ ions are substituted at Sr2+ sites in SrTiO3 (STO), the excess positive charges are compensated via three complementary routes: (1) strontium vacancies, (2) titanium vacancies, and (3) conduction electrons. In this study, we show that the photoelectrochemical properties of Ho-doped STO films are dependent on the charge compensation mechanisms. The compensation mechanism via the titanium vacancies exhibits the highest photocurrent density, which is 1.7 times higher than that of the pure STO sample. Based on the measured dielectric properties and electrochemical impedance spectroscopy data, we propose that the enhanced dielectric constant of the films can enlarge the width of the space charge region at the film/liquid interface, which eventually leads to the increase of the photocurrent density. Further enhancement of photocurrent density is obtained in the samples decorated with appropriate amounts of Pt nanoparticles, showing the advantage of composites for achieving the efficient photoelectrochemical property. Published version 2013-06-07T06:18:50Z 2019-12-06T19:21:18Z 2013-06-07T06:18:50Z 2019-12-06T19:21:18Z 2013 2013 Journal Article Zhao, L., Fang, L., Dong, W., Zheng, F., Shen, M., & Wu, T. (2013). Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films. Applied Physics Letters, 102(12). https://hdl.handle.net/10356/95776 http://hdl.handle.net/10220/10074 10.1063/1.4798829 en Applied physics letters © 2013 American Institute of Physics. This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at the following official DOI: [http://dx.doi.org/10.1063/1.4798829]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Chemistry::Biochemistry::Spectroscopy
spellingShingle DRNTU::Science::Chemistry::Biochemistry::Spectroscopy
Dong, Wen
Shen, Mingrong
Wu, Tom
Zheng, Fengang
Zhao, Long
Fang, Liang
Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films
description When Ho3+ ions are substituted at Sr2+ sites in SrTiO3 (STO), the excess positive charges are compensated via three complementary routes: (1) strontium vacancies, (2) titanium vacancies, and (3) conduction electrons. In this study, we show that the photoelectrochemical properties of Ho-doped STO films are dependent on the charge compensation mechanisms. The compensation mechanism via the titanium vacancies exhibits the highest photocurrent density, which is 1.7 times higher than that of the pure STO sample. Based on the measured dielectric properties and electrochemical impedance spectroscopy data, we propose that the enhanced dielectric constant of the films can enlarge the width of the space charge region at the film/liquid interface, which eventually leads to the increase of the photocurrent density. Further enhancement of photocurrent density is obtained in the samples decorated with appropriate amounts of Pt nanoparticles, showing the advantage of composites for achieving the efficient photoelectrochemical property.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Dong, Wen
Shen, Mingrong
Wu, Tom
Zheng, Fengang
Zhao, Long
Fang, Liang
format Article
author Dong, Wen
Shen, Mingrong
Wu, Tom
Zheng, Fengang
Zhao, Long
Fang, Liang
author_sort Dong, Wen
title Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films
title_short Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films
title_full Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films
title_fullStr Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films
title_full_unstemmed Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films
title_sort effect of charge compensation on the photoelectrochemical properties of ho-doped srtio3 films
publishDate 2013
url https://hdl.handle.net/10356/95776
http://hdl.handle.net/10220/10074
_version_ 1759853297285464064