Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS<sub>2</sub> Monolayers
Monolayered, semiconducting MoS<sub>2</sub> and their transition metal dichalcogenides (TMDCs) families are promising and low-cost materials for hydrogen generation through electrolytes (HER, hydrogen evolution reaction) due to their high activities and electrochemical stability during t...
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MDPI AG
2021-01-01
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| Online Access: | https://www.mdpi.com/2073-4344/11/1/70 |
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| author | Sangyeon Pak Jungmoon Lim John Hong SeungNam Cha |
| author_facet | Sangyeon Pak Jungmoon Lim John Hong SeungNam Cha |
| author_sort | Sangyeon Pak |
| collection | DOAJ |
| description | Monolayered, semiconducting MoS<sub>2</sub> and their transition metal dichalcogenides (TMDCs) families are promising and low-cost materials for hydrogen generation through electrolytes (HER, hydrogen evolution reaction) due to their high activities and electrochemical stability during the reaction. However, there is still a lack of understanding in identifying the underlying mechanism responsible for improving the electrocatalytic properties of theses monolayers. In this work, we investigated the significance of controlling carrier densities in a MoS<sub>2</sub> monolayer and in turn the corresponding electrocatalytic behaviors in relation to the energy band structure of MoS<sub>2</sub>. Surface functionalization was employed to achieve p-doping and n-doping in the MoS<sub>2</sub> monolayer that led to MoS<sub>2</sub> electrochemical devices with different catalytic performances. Specifically, the electron-rich MoS<sub>2</sub> surface showed lower overpotential and Tafel slope compared to the MoS<sub>2</sub> with surface functional groups that contributed to p-doping. We attributed such enhancement to the increase in the carrier density and the corresponding Fermi level that accelerated HER and charge transfer kinetics. These findings are of high importance in designing electrocatalysts based on two-dimensional TMDCs. |
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| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T13:27:39Z |
| publishDate | 2021-01-01 |
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| series | Catalysts |
| spelling | doaj.art-fb48aa8739274133a18a707bc74202552023-11-21T08:53:51ZengMDPI AGCatalysts2073-43442021-01-011117010.3390/catal11010070Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS<sub>2</sub> MonolayersSangyeon Pak0Jungmoon Lim1John Hong2SeungNam Cha3Department of Physics, Sungkyunkwan University (SKKU), Suwon 16419, KoreaDepartment of Physics, Sungkyunkwan University (SKKU), Suwon 16419, KoreaSchool of Materials Science and Engineering, Kookmin University, Seoul 02707, KoreaDepartment of Physics, Sungkyunkwan University (SKKU), Suwon 16419, KoreaMonolayered, semiconducting MoS<sub>2</sub> and their transition metal dichalcogenides (TMDCs) families are promising and low-cost materials for hydrogen generation through electrolytes (HER, hydrogen evolution reaction) due to their high activities and electrochemical stability during the reaction. However, there is still a lack of understanding in identifying the underlying mechanism responsible for improving the electrocatalytic properties of theses monolayers. In this work, we investigated the significance of controlling carrier densities in a MoS<sub>2</sub> monolayer and in turn the corresponding electrocatalytic behaviors in relation to the energy band structure of MoS<sub>2</sub>. Surface functionalization was employed to achieve p-doping and n-doping in the MoS<sub>2</sub> monolayer that led to MoS<sub>2</sub> electrochemical devices with different catalytic performances. Specifically, the electron-rich MoS<sub>2</sub> surface showed lower overpotential and Tafel slope compared to the MoS<sub>2</sub> with surface functional groups that contributed to p-doping. We attributed such enhancement to the increase in the carrier density and the corresponding Fermi level that accelerated HER and charge transfer kinetics. These findings are of high importance in designing electrocatalysts based on two-dimensional TMDCs.https://www.mdpi.com/2073-4344/11/1/70surface functionalizationhydrogen evolution reactiondopingMoS<sub>2</sub> monolayer |
| spellingShingle | Sangyeon Pak Jungmoon Lim John Hong SeungNam Cha Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS<sub>2</sub> Monolayers Catalysts surface functionalization hydrogen evolution reaction doping MoS<sub>2</sub> monolayer |
| title | Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS<sub>2</sub> Monolayers |
| title_full | Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS<sub>2</sub> Monolayers |
| title_fullStr | Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS<sub>2</sub> Monolayers |
| title_full_unstemmed | Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS<sub>2</sub> Monolayers |
| title_short | Enhanced Hydrogen Evolution Reaction in Surface Functionalized MoS<sub>2</sub> Monolayers |
| title_sort | enhanced hydrogen evolution reaction in surface functionalized mos sub 2 sub monolayers |
| topic | surface functionalization hydrogen evolution reaction doping MoS<sub>2</sub> monolayer |
| url | https://www.mdpi.com/2073-4344/11/1/70 |
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