In-Situ Generation of Nitrogen-Doped MoS<sub>2</sub> Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction
Here, nitrogen doped molybdenum disulfide quantum dots (N-MoS<sub>2</sub> QDs) are fabricated by making use of the pulsed laser ablation (PLA) process in liquid nitrogen (LN<sub>2</sub>) as a dopant agent. In fact, LN<sub>2</sub> contributes the rapid condensation...
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MDPI AG
2022-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/1/455 |
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| author | Fatemeh Shahi Parviz Parvin Seyedeh Zahra Mortazavi Ali Reyhani Mohtada Sadrzadeh Ali Moafi Mahdi Ebrahimi Mohammadreza Aghaei |
| author_facet | Fatemeh Shahi Parviz Parvin Seyedeh Zahra Mortazavi Ali Reyhani Mohtada Sadrzadeh Ali Moafi Mahdi Ebrahimi Mohammadreza Aghaei |
| author_sort | Fatemeh Shahi |
| collection | DOAJ |
| description | Here, nitrogen doped molybdenum disulfide quantum dots (N-MoS<sub>2</sub> QDs) are fabricated by making use of the pulsed laser ablation (PLA) process in liquid nitrogen (LN<sub>2</sub>) as a dopant agent. In fact, LN<sub>2</sub> contributes the rapid condensation of the plasma plume to form MoS<sub>2</sub> QDs, optimizing the conditions for the synthesis of N-doped MoS<sub>2</sub> with p-type property. The structural/optical features of the synthesized products are studied using transmission electron microscopy (TEM), absorption spectroscopy, photoluminescence (PL) spectroscopy techniques, and X-ray photoelectron spectroscopy (XPS). The TEM image shows the creation of MoS<sub>2</sub> QDs with 5.5 nm average size. UV-vis and PL spectroscopy confirm the formation of N-MoS<sub>2</sub> QDs according to the dominant peaks. The Tuck plot gives a direct band-gap of 4.34 eV for MoS<sub>2</sub> QDs. Furthermore, XPS spectroscopy reveals Mo-N bonding, indicating nitrogen doping as evidence of p-type MoS<sub>2</sub> QDs. Thus, PLA provides a single-stage way to the clean and green synthesis of the MoS<sub>2</sub> QDs suspension without a need for high vacuum devices and additional chemical components. Regarding the pristine MoS<sub>2</sub>, the N-MoS<sub>2</sub> QDs benefit from a low overpotential of −0.35 V at −10 mA/cm<sup>2</sup> per µg alongside a low Tafel slope of 300 mV/dec. Subsequently, the lower R<sub>ct</sub> value of N-MoS<sub>2</sub> QDs verifies the enhancement of the charge transfer kinetics mainly due to the elevated electronic conductivity. Furthermore, the quasi-rectangular cyclic voltammetry (CV) as well as the larger current window demonstrate a notable electrocatalytic activity. The former is based on the enhanced active sites in favor of N-MoS<sub>2</sub> QDs against other samples of interest. Thereby, it is discovered that the N-doped MoS<sub>2</sub> QD acts as an effective catalyst to notably improve the performance of the hydrogen evolution reaction (HER). |
| first_indexed | 2024-03-11T10:01:52Z |
| format | Article |
| id | doaj.art-5400c86a888a4e52bba2cdf8a51fa5b1 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T10:01:52Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-5400c86a888a4e52bba2cdf8a51fa5b12023-11-16T15:19:25ZengMDPI AGEnergies1996-10732022-12-0116145510.3390/en16010455In-Situ Generation of Nitrogen-Doped MoS<sub>2</sub> Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution ReactionFatemeh Shahi0Parviz Parvin1Seyedeh Zahra Mortazavi2Ali Reyhani3Mohtada Sadrzadeh4Ali Moafi5Mahdi Ebrahimi6Mohammadreza Aghaei7Energy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, IranEnergy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, IranFaculty of Science, Department of Physics, Imam Khomeini International University, Qazvin 34149-16818, IranFaculty of Science, Department of Physics, Imam Khomeini International University, Qazvin 34149-16818, IranMechanical Engineering Department, University of Alberta, Edmonton, AB T6G 2R3, CanadaEnergy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, IranEnergy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, IranDepartment of Ocean Operations and Civil Engineering, Norwegian University of Science and Technology (NTNU), 6009 Ålesund, NorwayHere, nitrogen doped molybdenum disulfide quantum dots (N-MoS<sub>2</sub> QDs) are fabricated by making use of the pulsed laser ablation (PLA) process in liquid nitrogen (LN<sub>2</sub>) as a dopant agent. In fact, LN<sub>2</sub> contributes the rapid condensation of the plasma plume to form MoS<sub>2</sub> QDs, optimizing the conditions for the synthesis of N-doped MoS<sub>2</sub> with p-type property. The structural/optical features of the synthesized products are studied using transmission electron microscopy (TEM), absorption spectroscopy, photoluminescence (PL) spectroscopy techniques, and X-ray photoelectron spectroscopy (XPS). The TEM image shows the creation of MoS<sub>2</sub> QDs with 5.5 nm average size. UV-vis and PL spectroscopy confirm the formation of N-MoS<sub>2</sub> QDs according to the dominant peaks. The Tuck plot gives a direct band-gap of 4.34 eV for MoS<sub>2</sub> QDs. Furthermore, XPS spectroscopy reveals Mo-N bonding, indicating nitrogen doping as evidence of p-type MoS<sub>2</sub> QDs. Thus, PLA provides a single-stage way to the clean and green synthesis of the MoS<sub>2</sub> QDs suspension without a need for high vacuum devices and additional chemical components. Regarding the pristine MoS<sub>2</sub>, the N-MoS<sub>2</sub> QDs benefit from a low overpotential of −0.35 V at −10 mA/cm<sup>2</sup> per µg alongside a low Tafel slope of 300 mV/dec. Subsequently, the lower R<sub>ct</sub> value of N-MoS<sub>2</sub> QDs verifies the enhancement of the charge transfer kinetics mainly due to the elevated electronic conductivity. Furthermore, the quasi-rectangular cyclic voltammetry (CV) as well as the larger current window demonstrate a notable electrocatalytic activity. The former is based on the enhanced active sites in favor of N-MoS<sub>2</sub> QDs against other samples of interest. Thereby, it is discovered that the N-doped MoS<sub>2</sub> QD acts as an effective catalyst to notably improve the performance of the hydrogen evolution reaction (HER).https://www.mdpi.com/1996-1073/16/1/455MoS<sub>2</sub> quantum dotspulsed laser ablationliquid nitrogennitrogen dopinghydrogen evolution reaction |
| spellingShingle | Fatemeh Shahi Parviz Parvin Seyedeh Zahra Mortazavi Ali Reyhani Mohtada Sadrzadeh Ali Moafi Mahdi Ebrahimi Mohammadreza Aghaei In-Situ Generation of Nitrogen-Doped MoS<sub>2</sub> Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction Energies MoS<sub>2</sub> quantum dots pulsed laser ablation liquid nitrogen nitrogen doping hydrogen evolution reaction |
| title | In-Situ Generation of Nitrogen-Doped MoS<sub>2</sub> Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction |
| title_full | In-Situ Generation of Nitrogen-Doped MoS<sub>2</sub> Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction |
| title_fullStr | In-Situ Generation of Nitrogen-Doped MoS<sub>2</sub> Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction |
| title_full_unstemmed | In-Situ Generation of Nitrogen-Doped MoS<sub>2</sub> Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction |
| title_short | In-Situ Generation of Nitrogen-Doped MoS<sub>2</sub> Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction |
| title_sort | in situ generation of nitrogen doped mos sub 2 sub quantum dots using laser ablation in cryogenic medium for hydrogen evolution reaction |
| topic | MoS<sub>2</sub> quantum dots pulsed laser ablation liquid nitrogen nitrogen doping hydrogen evolution reaction |
| url | https://www.mdpi.com/1996-1073/16/1/455 |
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