Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals

Photocorrosion of cuprous oxide (Cu2O) has notably limited its application as an efficient photocatalyst. We report a facile approach to visualize in situ formation of copper and oxygen vacancies on the Cu2O surface under ambient condition. By imaging photoexcited single Cu2O particles, the resultan...

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Main Authors: Lee, Jinn-Kye, Wu, Shuyang, Lim, Pei Chong, Zhang, Zhengyang
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/161667
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1616672023-02-28T20:08:34Z Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals Lee, Jinn-Kye Wu, Shuyang Lim, Pei Chong Zhang, Zhengyang School of Physical and Mathematical Sciences Science::Chemistry Photoluminescence Microscopy Oxygen Vacancy Photocorrosion of cuprous oxide (Cu2O) has notably limited its application as an efficient photocatalyst. We report a facile approach to visualize in situ formation of copper and oxygen vacancies on the Cu2O surface under ambient condition. By imaging photoexcited single Cu2O particles, the resultant photoluminescence generated at Cu2O surface enable effective localization of copper and oxygen vacancies. Single particle photoluminescence imaging showed substantial heterogeneity in the rate of defect formation at different facets with the truncated corners achieving the fastest initial rate of photooxidation before subsequently changing to the face and edge sites as the photocorrosion proceeds. The generation of copper or oxygen vacancy is proportional to the photoexcitation power, while pH-dependent studies rationalized alkaline conditions for the formation of copper vacancy. Reaction in an electron-hole scavenger system showed that photooxidation and photoreduction will simultaneously occur, yet heterogeneously on the surface of Cu2O, with rate of copper vacancy formation being fastest. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Submitted/Accepted version This work was supported by the School of Physical and Mathematical Sciences at Nanyang Technological University, Singapore Ministry of Education, Academic Research Fund (No. RG4/19(S) and RG10/20), and the Singapore Agency for Science, Technology and Research (A*STAR) AME YIRG grant (No. A2084c0065). 2022-09-13T08:35:02Z 2022-09-13T08:35:02Z 2022 Journal Article Lee, J., Wu, S., Lim, P. C. & Zhang, Z. (2022). Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals. Nano Letters, 22(12), 4654-4660. https://dx.doi.org/10.1021/acs.nanolett.2c00458 1530-6984 https://hdl.handle.net/10356/161667 10.1021/acs.nanolett.2c00458 35653432 2-s2.0-85131964650 12 22 4654 4660 en RG4/19(S) RG10/20 A2084c0065 Nano Letters This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © 2022 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.nanolett.2c00458. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Chemistry
Photoluminescence Microscopy
Oxygen Vacancy
spellingShingle Science::Chemistry
Photoluminescence Microscopy
Oxygen Vacancy
Lee, Jinn-Kye
Wu, Shuyang
Lim, Pei Chong
Zhang, Zhengyang
Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals
description Photocorrosion of cuprous oxide (Cu2O) has notably limited its application as an efficient photocatalyst. We report a facile approach to visualize in situ formation of copper and oxygen vacancies on the Cu2O surface under ambient condition. By imaging photoexcited single Cu2O particles, the resultant photoluminescence generated at Cu2O surface enable effective localization of copper and oxygen vacancies. Single particle photoluminescence imaging showed substantial heterogeneity in the rate of defect formation at different facets with the truncated corners achieving the fastest initial rate of photooxidation before subsequently changing to the face and edge sites as the photocorrosion proceeds. The generation of copper or oxygen vacancy is proportional to the photoexcitation power, while pH-dependent studies rationalized alkaline conditions for the formation of copper vacancy. Reaction in an electron-hole scavenger system showed that photooxidation and photoreduction will simultaneously occur, yet heterogeneously on the surface of Cu2O, with rate of copper vacancy formation being fastest.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Lee, Jinn-Kye
Wu, Shuyang
Lim, Pei Chong
Zhang, Zhengyang
format Article
author Lee, Jinn-Kye
Wu, Shuyang
Lim, Pei Chong
Zhang, Zhengyang
author_sort Lee, Jinn-Kye
title Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals
title_short Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals
title_full Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals
title_fullStr Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals
title_full_unstemmed Spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals
title_sort spectrally resolved single particle photoluminescence microscopy reveals heterogeneous photocorrosion activity of cuprous oxide microcrystals
publishDate 2022
url https://hdl.handle.net/10356/161667
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