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Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst

Navakoteswara Rao Vempuluru, Cheralathan Kanakkampalayam Krishnan, Ravi Parnapalli, Jayaramakrishnan Velusamy, Sathish Marappan, Sudhagar Pitchaimuthu Orcid Logo, Mamathakumari Murikinati, Shankar Muthukonda Venkatakrishnan

Ceramics International, Volume: 47, Issue: 7, Pages: 10206 - 10215

Swansea University Author: Sudhagar Pitchaimuthu Orcid Logo

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DOI (Published version): 10.1016/j.ceramint.2020.12.062

Abstract

This work explores the critical role of NiO co-catalyst assembled on the surface of a CuS primary photocatalyst which effectively improves interface properties and enhances solar-to-hydrogen production by prolonging lifetime of photo-excitons generated at the CuS surface. The nanoscale CuS/NiO heter...

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Published in: Ceramics International
ISSN: 0272-8842
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa55864
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The nanoscale CuS/NiO heterojunction is formulated using hydrothermal and wet impregnation methods. The resultant CuS/NiO composite shows optical absorbance between 380-780 nm region. The type-II energetic structure formed at CuS/NiO heterojunction facilitates rapid charge separation and as a result, the CuS/NiO composite exhibits 13 folds higher photocatalytic water splitting performance than CuO and NiO. The champion CuO/NiO photocatalyst is first identified by screening the catalysts using a preliminary water splitting test reaction under natural Sunlight irradiation. After the optimization of the catalyst, it was further explored for enhanced photocatalytic hydrogen production using different organic substances dispersed in water (alcohols, amine and organic acids). The champion CuS/NiO catalyst(CPN-2) exhibited the photocatalytic hydrogen production rate of 52.3 mmol.h-1.g-1cat in the presence of lactic acid-based aqueous electrolyte and, it is superior than hydrogen production rate obtained in the presence of other organic substances (triethanolamine, glycerol, ethylene glycol, methanol) tested under identical experimental conditions. These results indicate that the energetic structure of CuS/NiO photocatalyst is favorable for photocatalytic oxidation of lactic acid or reformation of lactic acid. The oxidation of lactic acid contributes oxidative electrons for enhanced hydrogen generation as well as protects CuS from photocorrosion. The modification of surface property and energetic structure of CuS photocatalyst by the NiO co-catalyst improves photogenerated charge carrier separation and in turn enhances the solar-to-hydrogen generation. 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spelling 2021-05-04T10:37:49.1422533 v2 55864 2020-12-10 Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst 2fdbee02f4bfc5a1b174c8bd04afbd2b 0000-0001-9098-8806 Sudhagar Pitchaimuthu Sudhagar Pitchaimuthu true false 2020-12-10 EEN This work explores the critical role of NiO co-catalyst assembled on the surface of a CuS primary photocatalyst which effectively improves interface properties and enhances solar-to-hydrogen production by prolonging lifetime of photo-excitons generated at the CuS surface. The nanoscale CuS/NiO heterojunction is formulated using hydrothermal and wet impregnation methods. The resultant CuS/NiO composite shows optical absorbance between 380-780 nm region. The type-II energetic structure formed at CuS/NiO heterojunction facilitates rapid charge separation and as a result, the CuS/NiO composite exhibits 13 folds higher photocatalytic water splitting performance than CuO and NiO. The champion CuO/NiO photocatalyst is first identified by screening the catalysts using a preliminary water splitting test reaction under natural Sunlight irradiation. After the optimization of the catalyst, it was further explored for enhanced photocatalytic hydrogen production using different organic substances dispersed in water (alcohols, amine and organic acids). The champion CuS/NiO catalyst(CPN-2) exhibited the photocatalytic hydrogen production rate of 52.3 mmol.h-1.g-1cat in the presence of lactic acid-based aqueous electrolyte and, it is superior than hydrogen production rate obtained in the presence of other organic substances (triethanolamine, glycerol, ethylene glycol, methanol) tested under identical experimental conditions. These results indicate that the energetic structure of CuS/NiO photocatalyst is favorable for photocatalytic oxidation of lactic acid or reformation of lactic acid. The oxidation of lactic acid contributes oxidative electrons for enhanced hydrogen generation as well as protects CuS from photocorrosion. The modification of surface property and energetic structure of CuS photocatalyst by the NiO co-catalyst improves photogenerated charge carrier separation and in turn enhances the solar-to-hydrogen generation. The recyclability tests showed the potential of CPN-2 photocatalystfor prolonged photocatalytic hydrogen production while continuous supply of lactic acid feedstock is available. Journal Article Ceramics International 47 7 10206 10215 Elsevier BV 0272-8842 Photocatalysis, solar hydrogen, lactic acid, water splitting, metal chalcogenide 1 4 2021 2021-04-01 10.1016/j.ceramint.2020.12.062 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2021-05-04T10:37:49.1422533 2020-12-10T13:22:36.4796003 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Navakoteswara Rao Vempuluru 1 Cheralathan Kanakkampalayam Krishnan 2 Ravi Parnapalli 3 Jayaramakrishnan Velusamy 4 Sathish Marappan 5 Sudhagar Pitchaimuthu 0000-0001-9098-8806 6 Mamathakumari Murikinati 7 Shankar Muthukonda Venkatakrishnan 8 55864__18867__d15a2d70a72e4817bd2ea6d0f3bf18e4.pdf 55864.pdf 2020-12-11T09:27:57.7836217 Output 2262472 application/pdf Accepted Manuscript true 2021-12-09T00:00:00.0000000 ©2020 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst
spellingShingle Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst
Sudhagar Pitchaimuthu
title_short Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst
title_full Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst
title_fullStr Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst
title_full_unstemmed Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst
title_sort Solar hydrogen generation from organic substance using earth abundant CuS–NiO heterojunction semiconductor photocatalyst
author_id_str_mv 2fdbee02f4bfc5a1b174c8bd04afbd2b
author_id_fullname_str_mv 2fdbee02f4bfc5a1b174c8bd04afbd2b_***_Sudhagar Pitchaimuthu
author Sudhagar Pitchaimuthu
author2 Navakoteswara Rao Vempuluru
Cheralathan Kanakkampalayam Krishnan
Ravi Parnapalli
Jayaramakrishnan Velusamy
Sathish Marappan
Sudhagar Pitchaimuthu
Mamathakumari Murikinati
Shankar Muthukonda Venkatakrishnan
format Journal article
container_title Ceramics International
container_volume 47
container_issue 7
container_start_page 10206
publishDate 2021
institution Swansea University
issn 0272-8842
doi_str_mv 10.1016/j.ceramint.2020.12.062
publisher Elsevier BV
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 1
active_str 0
description This work explores the critical role of NiO co-catalyst assembled on the surface of a CuS primary photocatalyst which effectively improves interface properties and enhances solar-to-hydrogen production by prolonging lifetime of photo-excitons generated at the CuS surface. The nanoscale CuS/NiO heterojunction is formulated using hydrothermal and wet impregnation methods. The resultant CuS/NiO composite shows optical absorbance between 380-780 nm region. The type-II energetic structure formed at CuS/NiO heterojunction facilitates rapid charge separation and as a result, the CuS/NiO composite exhibits 13 folds higher photocatalytic water splitting performance than CuO and NiO. The champion CuO/NiO photocatalyst is first identified by screening the catalysts using a preliminary water splitting test reaction under natural Sunlight irradiation. After the optimization of the catalyst, it was further explored for enhanced photocatalytic hydrogen production using different organic substances dispersed in water (alcohols, amine and organic acids). The champion CuS/NiO catalyst(CPN-2) exhibited the photocatalytic hydrogen production rate of 52.3 mmol.h-1.g-1cat in the presence of lactic acid-based aqueous electrolyte and, it is superior than hydrogen production rate obtained in the presence of other organic substances (triethanolamine, glycerol, ethylene glycol, methanol) tested under identical experimental conditions. These results indicate that the energetic structure of CuS/NiO photocatalyst is favorable for photocatalytic oxidation of lactic acid or reformation of lactic acid. The oxidation of lactic acid contributes oxidative electrons for enhanced hydrogen generation as well as protects CuS from photocorrosion. The modification of surface property and energetic structure of CuS photocatalyst by the NiO co-catalyst improves photogenerated charge carrier separation and in turn enhances the solar-to-hydrogen generation. The recyclability tests showed the potential of CPN-2 photocatalystfor prolonged photocatalytic hydrogen production while continuous supply of lactic acid feedstock is available.
published_date 2021-04-01T04:10:23Z
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score 11.012678

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