Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER
Atomically-thin 2D materials have changed the landscapes of many fields. Their applications however are limited by lack of methods for readily and scalable production with high quality. Herein, a simple strategy is reported to exfoliate pristine single or few-layered 2D materials (MoS2, h-BN, WS2, g...
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sg-ntu-dr.10356-1554682023-12-29T06:53:53Z Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER Gong, Jun Zhang, Zheye Zeng, Zhiping Wang, Wenjun Kong, Linguxan Liu, Jiyang Chen, Peng School of Chemical and Biomedical Engineering Engineering::Chemical engineering 2D Materials Graphene Quantum Dots Van Der Waals Heterojunction Hydrogen Evolution Reaction Atomically-thin 2D materials have changed the landscapes of many fields. Their applications however are limited by lack of methods for readily and scalable production with high quality. Herein, a simple strategy is reported to exfoliate pristine single or few-layered 2D materials (MoS2, h-BN, WS2, g-C3N4 microsheets) using bottom-up grown amphiphilic graphene quantum dots (GQDs) as both the intercalation agent and dispersant. Further, it is shown that the as-formed GQD/MoS2 van der Waals heterojunctions (vdWHs) give enhanced performance for electrocatalysis of hydrogen evolution reaction (HER) owing to the synergistic coupling at the 0D/2D heterojunction, delivering a current density of 10 mA cm−2 at a low overpotential of 160 mV with a small Tafel slope of 56.9 mV dec−1. In addition to providing a new method for preparing ultrathin 2D microsheets, this study unleashes the application potential of 2D materials and GQD-based 0D/2D vdWHs as non-precious electrocatalysts. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Accepted version This work was supported by an AME-IRG grant (A1983c0025) from Agency for Science, Technology and Research (A*STAR) of Singapore and an AcRF tier 2 grant (MOE2017-T2-2-005) from Ministry of Education (Singapore). 2022-03-01T06:49:27Z 2022-03-01T06:49:27Z 2021 Journal Article Gong, J., Zhang, Z., Zeng, Z., Wang, W., Kong, L., Liu, J. & Chen, P. (2021). Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER. Carbon, 184, 554-561. https://dx.doi.org/10.1016/j.carbon.2021.08.063 0008-6223 https://hdl.handle.net/10356/155468 10.1016/j.carbon.2021.08.063 2-s2.0-85113732915 184 554 561 en A1983c0025 MOE2017-T2-2-005 Carbon 10.21979/N9/UZIK0N © 2021 Elsevier Ltd. All rights reserved. This paper was published in Carbon and is made available with permission of Elsevier Ltd. application/pdf application/pdf |
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Engineering::Chemical engineering 2D Materials Graphene Quantum Dots Van Der Waals Heterojunction Hydrogen Evolution Reaction Gong, Jun Zhang, Zheye Zeng, Zhiping Wang, Wenjun Kong, Linguxan Liu, Jiyang Chen, Peng Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER |
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Atomically-thin 2D materials have changed the landscapes of many fields. Their applications however are limited by lack of methods for readily and scalable production with high quality. Herein, a simple strategy is reported to exfoliate pristine single or few-layered 2D materials (MoS2, h-BN, WS2, g-C3N4 microsheets) using bottom-up grown amphiphilic graphene quantum dots (GQDs) as both the intercalation agent and dispersant. Further, it is shown that the as-formed GQD/MoS2 van der Waals heterojunctions (vdWHs) give enhanced performance for electrocatalysis of hydrogen evolution reaction (HER) owing to the synergistic coupling at the 0D/2D heterojunction, delivering a current density of 10 mA cm−2 at a low overpotential of 160 mV with a small Tafel slope of 56.9 mV dec−1. In addition to providing a new method for preparing ultrathin 2D microsheets, this study unleashes the application potential of 2D materials and GQD-based 0D/2D vdWHs as non-precious electrocatalysts. |
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School of Chemical and Biomedical Engineering |
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School of Chemical and Biomedical Engineering Gong, Jun Zhang, Zheye Zeng, Zhiping Wang, Wenjun Kong, Linguxan Liu, Jiyang Chen, Peng |
format |
Article |
author |
Gong, Jun Zhang, Zheye Zeng, Zhiping Wang, Wenjun Kong, Linguxan Liu, Jiyang Chen, Peng |
author_sort |
Gong, Jun |
title |
Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER |
title_short |
Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER |
title_full |
Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER |
title_fullStr |
Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER |
title_full_unstemmed |
Graphene quantum dots assisted exfoliation of atomically-thin 2D materials and as-formed 0D/2D van der Waals heterojunction for HER |
title_sort |
graphene quantum dots assisted exfoliation of atomically-thin 2d materials and as-formed 0d/2d van der waals heterojunction for her |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/155468 |
_version_ |
1787136804975017984 |