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Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation

Vempuluru Navakoteswara Rao, Sudhagar Pitchaimuthu Orcid Logo, Parnapalle Ravi, Marappan Sathish, Hyungkyu Han, Shankar Muthukonda Venkatakrishnan

ChemCatChem, Volume: 12, Issue: 11, Pages: 3139 - 3152

Swansea University Author: Sudhagar Pitchaimuthu Orcid Logo

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DOI (Published version): 10.1002/cctc.202000184

Abstract

Metal chalcogenide‐based semiconductor nanostructures are promising candidate for photocatalytic or photoelectrocatalytic hydrogen generation. In order to protect CdSe from photocorrosion, a layer of TiO 2 wrapped (shell) onto CdSe (core) nanocapsule via the post‐synthesis process. The morphology st...

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Published in: ChemCatChem
ISSN: 1867-3880 1867-3899
Published: Wiley 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53873
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spelling 2022-11-16T13:54:16.4965161 v2 53873 2020-03-27 Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation 2fdbee02f4bfc5a1b174c8bd04afbd2b 0000-0001-9098-8806 Sudhagar Pitchaimuthu Sudhagar Pitchaimuthu true false 2020-03-27 EEN Metal chalcogenide‐based semiconductor nanostructures are promising candidate for photocatalytic or photoelectrocatalytic hydrogen generation. In order to protect CdSe from photocorrosion, a layer of TiO 2 wrapped (shell) onto CdSe (core) nanocapsule via the post‐synthesis process. The morphology studies confirm that a thin crystalline TiO 2 shell (3‐8 nm) wrapped in all the three directions onto CdSe core and thickness of the shell can be controlled through modulating titania precursor concentration. The feasibility of pristine CdSe nanocapsules and CdSe@TiO 2 in transforming visible light to hydrogen conversion was tested through photocatalysis reaction. The CdSe@TiO 2 nanocapsules generating a four‐fold high rate of hydrogen gas than pristine CdSe. In order to understand the role of shell@core, we have examined photoelectrochemical and impedance analysis. The CdSe@TiO 2 nanocapsules showed high photoelectric current generation and less charge transfer resistance at electrode/electrolyte interfaces compared to pristine CdSe. These studies endorse that chemically synthesized crystalline TiO 2 shell played a multifunctional role in (a) surface passivation from photocorrosion, (b) promoting photocharge carrier separation via tunneling process between CdSe and TiO 2 interface. As a result, CdSe@TiO 2 nanocapsules showed a high conversion efficiency of 12.9% under visible light irradiation (328 mW.cm ‐2 ) and turn over frequency is 0.05018 s ‐1 . atom ‐1 . Journal Article ChemCatChem 12 11 3139 3152 Wiley 1867-3880 1867-3899 CdSe, hydrogengeneration, nanocapsules, photocatalyst, solar 5 6 2020 2020-06-05 10.1002/cctc.202000184 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2022-11-16T13:54:16.4965161 2020-03-27T09:23:44.8448312 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry Vempuluru Navakoteswara Rao 1 Sudhagar Pitchaimuthu 0000-0001-9098-8806 2 Parnapalle Ravi 3 Marappan Sathish 4 Hyungkyu Han 5 Shankar Muthukonda Venkatakrishnan 6 53873__16941__eccaca2ab1474edaa6866dee3969ed20.pdf 53873.pdf 2020-03-27T09:27:22.0213103 Output 1713633 application/pdf Accepted Manuscript true 2021-03-23T00:00:00.0000000 true eng
title Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation
spellingShingle Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation
Sudhagar Pitchaimuthu
title_short Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation
title_full Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation
title_fullStr Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation
title_full_unstemmed Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation
title_sort Retorting Photocorrosion and Enhanced Charge Carrier Separation at CdSe Nanocapsules by Chemically Synthesized TiO2 Shell for Photocatalytic Hydrogen Fuel Generation
author_id_str_mv 2fdbee02f4bfc5a1b174c8bd04afbd2b
author_id_fullname_str_mv 2fdbee02f4bfc5a1b174c8bd04afbd2b_***_Sudhagar Pitchaimuthu
author Sudhagar Pitchaimuthu
author2 Vempuluru Navakoteswara Rao
Sudhagar Pitchaimuthu
Parnapalle Ravi
Marappan Sathish
Hyungkyu Han
Shankar Muthukonda Venkatakrishnan
format Journal article
container_title ChemCatChem
container_volume 12
container_issue 11
container_start_page 3139
publishDate 2020
institution Swansea University
issn 1867-3880
1867-3899
doi_str_mv 10.1002/cctc.202000184
publisher Wiley
college_str Faculty of Science and Engineering
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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 - Chemistry{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemistry
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description Metal chalcogenide‐based semiconductor nanostructures are promising candidate for photocatalytic or photoelectrocatalytic hydrogen generation. In order to protect CdSe from photocorrosion, a layer of TiO 2 wrapped (shell) onto CdSe (core) nanocapsule via the post‐synthesis process. The morphology studies confirm that a thin crystalline TiO 2 shell (3‐8 nm) wrapped in all the three directions onto CdSe core and thickness of the shell can be controlled through modulating titania precursor concentration. The feasibility of pristine CdSe nanocapsules and CdSe@TiO 2 in transforming visible light to hydrogen conversion was tested through photocatalysis reaction. The CdSe@TiO 2 nanocapsules generating a four‐fold high rate of hydrogen gas than pristine CdSe. In order to understand the role of shell@core, we have examined photoelectrochemical and impedance analysis. The CdSe@TiO 2 nanocapsules showed high photoelectric current generation and less charge transfer resistance at electrode/electrolyte interfaces compared to pristine CdSe. These studies endorse that chemically synthesized crystalline TiO 2 shell played a multifunctional role in (a) surface passivation from photocorrosion, (b) promoting photocharge carrier separation via tunneling process between CdSe and TiO 2 interface. As a result, CdSe@TiO 2 nanocapsules showed a high conversion efficiency of 12.9% under visible light irradiation (328 mW.cm ‐2 ) and turn over frequency is 0.05018 s ‐1 . atom ‐1 .
published_date 2020-06-05T04:07:04Z
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