Hydrogen evolution reaction catalyst with high catalytic activity by interplay between organic molecules and transition metal dichalcogenide monolayers
- Authors
- Adofo, Laud Anim; Kim, Hyung Jin; Agyapong-Fordjour, Frederick Osei-Tutu; Nguyen, Huong Thi Thanh; Jin, Jeong Won; Kim, Yong In; Kim, Seon Je; Kim, Jung Ho; Boandoh, Stephen; Choi, Soo Ho; Lee, Su Jin; Yun, Seok Joon; Kim, Young-Min; Kim, Soo Min; Han, Young-Kyu; Kim, Ki Kang
- Issue Date
- Apr-2022
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Two dimensional materials; Molybdenum disulphide; Melamine; Chemical functionalization; Hydrogen generation
- Citation
- MATERIALS TODAY ENERGY, v.25
- Journal Title
- MATERIALS TODAY ENERGY
- Volume
- 25
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/152840
- DOI
- 10.1016/j.mtener.2022.100976
- ISSN
- 2468-6069
- Abstract
- Introducing sulfur vacancies (S-V) in monolayer molybdenum disulfide (MoS2) is a well-known approach to activate the inert basal planes for efficient hydrogen evolution reaction (HER). However, higher S-V induction accelerates the disruption of the crystal structure. We report an efficient method for improving catalytic activity and durability via covalent melamine (MEL) functionalization at S-V sites in the basal plane of transition metal dichalcogenide (TMD) monolayers. Functionalized 2H-MoS2 requires only an overpotential of 160 mV at 100 mAcm(-2) in acidic medium with chronoamperometric durability of more than 14 h at 30 mAcm(-2). Our theoretical results reveal that chemical functionalization creates novel HER active sites, where catalytic activity of the MEL-MoS2 catalyst arises from the interplay of the ring N sites of the MEL and the S atoms on the 2H-MoS2 surface. These findings of chemically coupled organic molecule-TMD system will pave new avenues for development of superior HER catalysts. (C) 2022 Elsevier Ltd. All rights reserved.
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