Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation

In this study, we report an oxygen-doped MoS2 quantum dot (O-MoS2 QD) hybrid electrocatalyst for the hydrogen evolution reaction (HER). The O-MoS2 QDs were prepared with a one-pot microwave method by hydrazine-mediated oxygen-doping. The synthetic method is straightforward, time-saving, and can be a...

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Main Authors: Peng, Juan, Yu, Xueping, Meng, Yang, Tan, Huiteng, Song, Pin, Liu, Zheng, Yan, Qingyu
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/144260
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1442602023-07-14T16:01:13Z Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation Peng, Juan Yu, Xueping Meng, Yang Tan, Huiteng Song, Pin Liu, Zheng Yan, Qingyu School of Materials Science and Engineering Center for Programmable Materials Engineering::Materials In this study, we report an oxygen-doped MoS2 quantum dot (O-MoS2 QD) hybrid electrocatalyst for the hydrogen evolution reaction (HER). The O-MoS2 QDs were prepared with a one-pot microwave method by hydrazine-mediated oxygen-doping. The synthetic method is straightforward, time-saving, and can be applied in large scale preparation. Ultra-small O-MoS2 QDs with the average size of 5.83 nm and 1-4 layers can be uniformly distributed on the surface of reduced graphene oxide (RGO). Benefited from the unique structure and the doping effect of oxygen in the MoS2 QDs and the great number of active sites, the O-MoS2 QD hybrid displayed outstanding electrocatalytic performance toward HER. A low overpotential of 76 mV at 10 mA/cm2 and a Tafel slope of 58 mV/dec were obtained in an acidic solution toward HER. Additionally, the resultant O-MoS2 QD hybrid also exhibited excellent stability and durability toward HER, displaying negligible current density loss after 1000 cycles of cyclic voltammetry. The design and synthesis of the electrocatalyst in this work open up a prospective route to prepare active and stable electrocatalysts toward substituting precious metals for hydrogen generation. Ministry of Education (MOE) Published version The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 21765016) and Singapore MOE Tier 2 (Grant Nos. MOE2017- T2-2-069 and MOE2018-T2-1-010). This work was also supported by Ningxia leading scientific and technological innovation talents Project (Grant No. KJT2018002), the Natural Science Foundation of Ningxia (Grant No. 2018AAC03012), and the First-rate Discipline Construction Project of Ningxia (Grant No. NXYLXK2017A04). 2020-10-23T08:07:46Z 2020-10-23T08:07:46Z 2020 Journal Article Peng, J., Yu, X., Meng, Y., Tan, H., Song, P., Liu, Z., & Yan, Q. (2020). Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation. The Journal of Chemical Physics, 152(13), 134704-. doi:10.1063/1.5142204 0021-9606 https://hdl.handle.net/10356/144260 10.1063/1.5142204 32268743 13 152 en MOE2017- T2-2-069 MOE2018-T2-1-010 The Journal of Chemical Physics © 2020 The Author(s). All rights reserved. This paper was published by AIP in The Journal of Chemical Physics and is made available with permission of The Author(s). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
spellingShingle Engineering::Materials
Peng, Juan
Yu, Xueping
Meng, Yang
Tan, Huiteng
Song, Pin
Liu, Zheng
Yan, Qingyu
Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation
description In this study, we report an oxygen-doped MoS2 quantum dot (O-MoS2 QD) hybrid electrocatalyst for the hydrogen evolution reaction (HER). The O-MoS2 QDs were prepared with a one-pot microwave method by hydrazine-mediated oxygen-doping. The synthetic method is straightforward, time-saving, and can be applied in large scale preparation. Ultra-small O-MoS2 QDs with the average size of 5.83 nm and 1-4 layers can be uniformly distributed on the surface of reduced graphene oxide (RGO). Benefited from the unique structure and the doping effect of oxygen in the MoS2 QDs and the great number of active sites, the O-MoS2 QD hybrid displayed outstanding electrocatalytic performance toward HER. A low overpotential of 76 mV at 10 mA/cm2 and a Tafel slope of 58 mV/dec were obtained in an acidic solution toward HER. Additionally, the resultant O-MoS2 QD hybrid also exhibited excellent stability and durability toward HER, displaying negligible current density loss after 1000 cycles of cyclic voltammetry. The design and synthesis of the electrocatalyst in this work open up a prospective route to prepare active and stable electrocatalysts toward substituting precious metals for hydrogen generation.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Peng, Juan
Yu, Xueping
Meng, Yang
Tan, Huiteng
Song, Pin
Liu, Zheng
Yan, Qingyu
format Article
author Peng, Juan
Yu, Xueping
Meng, Yang
Tan, Huiteng
Song, Pin
Liu, Zheng
Yan, Qingyu
author_sort Peng, Juan
title Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation
title_short Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation
title_full Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation
title_fullStr Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation
title_full_unstemmed Oxygen doped MoS2 quantum dots for efficient electrocatalytic hydrogen generation
title_sort oxygen doped mos2 quantum dots for efficient electrocatalytic hydrogen generation
publishDate 2020
url https://hdl.handle.net/10356/144260
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