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Kim, Guntae
GUNS Lab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, PEMFC, metal-air batteries, Metal-CO2 system

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In-situ coalesced vacancies on MoSe2 mimicking noble metal: Unprecedented Tafel reaction in hydrogen evolution

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Title
In-situ coalesced vacancies on MoSe2 mimicking noble metal: Unprecedented Tafel reaction in hydrogen evolution
Author
Lee, JunghyunKim, ChangminChoi, KeunsuSeo, JihyungChoi, YunseongChoi, WooseonKim, Young-MinJeong, Hu YoungLee, Jun HeeKim, GuntaePark, Hyesung
Issue Date
2019-09
Publisher
Elsevier Ltd
Citation
NANO ENERGY, v.63, pp.103846
Abstract
Transition metal dichalcogenides (TMDs) have shown promising potential as electrocatalyst materials for the hydrogen evolution reaction (HER). However, the low catalytic activity in the basal planes of TMDs results in only limited HER activity, and several strategies to overcome this bottleneck have been proposed, involving various post-synthesis treatments such as introducing chalcogen vacancies or applying mechanical strain. Herein, we demonstrate in-situ modulation of chalcogen vacancy sites during the chemical vapor deposition synthesis of molybdenum diselenides (MoSe2) for application in the HER. We demonstrate for the first time that the Tafel reaction can be activated via in-situ vacancy-engineered MoSe2, resulting in improved onset potential and an exceptionally low Tafel slope, which exhibits one of the lowest values reported for TMDs to date in our knowledge. Density functional theory calculations revealed that vacancy coalescence in the MoSe2 lattice reduced the hydrogen adsorption free energy and diffusion barrier to activate the Tafel reaction. Our approach could contribute to the development of high-performance TMDs-based electrocatalysts with relatively simple processability to make hydrogen production more viable. © 2019 Elsevier Ltd
URI
https://scholarworks.unist.ac.kr/handle/201301/30618
URL
https://www.sciencedirect.com/science/article/pii/S2211285519305464?via%3Dihub
DOI
10.1016/j.nanoen.2019.06.042
ISSN
2211-2855
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UCRF_Journal Papers
ECHE_Journal Papers
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