Journal
CARBON
Volume 184, Issue -, Pages 554-561Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.08.063
Keywords
2D materials; Graphene quantum dots; van der Waals heterojunction; Hydrogen evolution reaction
Funding
- AME-IRG grant from Agency for Science, Technology and Research (A*STAR) of Singapore [A1983c0025]
- AcRF tier 2 grant from Ministry of Education (Singapore) [MOE2017-T2-2-005]
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Thin 2D materials at atomic scale have transformed various fields, but their applications are hindered by the lack of scalable production methods. A new strategy using amphiphilic graphene quantum dots to exfoliate 2D materials and form vdWHs shows enhanced electrocatalytic performance for hydrogen evolution reaction. This study not only provides a new method for preparing ultrathin 2D microsheets, but also reveals the potential of GQD-based vdWHs as non-precious electrocatalysts.
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 micro sheets) 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. (C) 2021 Elsevier Ltd. All rights reserved.
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