LAPSE:2023.35547
Published Article
LAPSE:2023.35547
In-Situ Generation of Nitrogen-Doped MoS2 Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction
May 2, 2023
Here, nitrogen doped molybdenum disulfide quantum dots (N-MoS2 QDs) are fabricated by making use of the pulsed laser ablation (PLA) process in liquid nitrogen (LN2) as a dopant agent. In fact, LN2 contributes the rapid condensation of the plasma plume to form MoS2 QDs, optimizing the conditions for the synthesis of N-doped MoS2 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 MoS2 QDs with 5.5 nm average size. UV-vis and PL spectroscopy confirm the formation of N-MoS2 QDs according to the dominant peaks. The Tuck plot gives a direct band-gap of 4.34 eV for MoS2 QDs. Furthermore, XPS spectroscopy reveals Mo-N bonding, indicating nitrogen doping as evidence of p-type MoS2 QDs. Thus, PLA provides a single-stage way to the clean and green synthesis of the MoS2 QDs suspension without a need for high vacuum devices and additional chemical components. Regarding the pristine MoS2, the N-MoS2 QDs benefit from a low overpotential of −0.35 V at −10 mA/cm2 per µg alongside a low Tafel slope of 300 mV/dec. Subsequently, the lower Rct value of N-MoS2 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-MoS2 QDs against other samples of interest. Thereby, it is discovered that the N-doped MoS2 QD acts as an effective catalyst to notably improve the performance of the hydrogen evolution reaction (HER).
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Keywords
hydrogen evolution reaction, liquid nitrogen, MoS2 quantum dots, nitrogen doping, pulsed laser ablation
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Suggested Citation
Shahi F, Parvin P, Mortazavi SZ, Reyhani A, Sadrzadeh M, Moafi A, Ebrahimi M, Aghaei M. In-Situ Generation of Nitrogen-Doped MoS2 Quantum Dots Using Laser Ablation in Cryogenic Medium for Hydrogen Evolution Reaction. (2023). LAPSE:2023.35547
Author Affiliations
Shahi F: Energy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, Iran [ORCID]
Parvin P: Energy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, Iran
Mortazavi SZ: Faculty of Science, Department of Physics, Imam Khomeini International University, Qazvin 34149-16818, Iran [ORCID]
Reyhani A: Faculty of Science, Department of Physics, Imam Khomeini International University, Qazvin 34149-16818, Iran
Sadrzadeh M: Mechanical Engineering Department, University of Alberta, Edmonton, AB T6G 2R3, Canada [ORCID]
Moafi A: Energy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, Iran
Ebrahimi M: Energy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, Iran
Aghaei M: Department of Ocean Operations and Civil Engineering, Norwegian University of Science and Technology (NTNU), 6009 Ålesund, Norway; Department of Sustainable Systems Engineering (INATECH), University of Freiburg, 79110 Freiburg, Germany [ORCID]
Parvin P: Energy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, Iran
Mortazavi SZ: Faculty of Science, Department of Physics, Imam Khomeini International University, Qazvin 34149-16818, Iran [ORCID]
Reyhani A: Faculty of Science, Department of Physics, Imam Khomeini International University, Qazvin 34149-16818, Iran
Sadrzadeh M: Mechanical Engineering Department, University of Alberta, Edmonton, AB T6G 2R3, Canada [ORCID]
Moafi A: Energy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, Iran
Ebrahimi M: Energy Engineering and Physics Department, Amirkabir University of Technology, Tehran 15119-43943, Iran
Aghaei M: Department of Ocean Operations and Civil Engineering, Norwegian University of Science and Technology (NTNU), 6009 Ålesund, Norway; Department of Sustainable Systems Engineering (INATECH), University of Freiburg, 79110 Freiburg, Germany [ORCID]
Journal Name
Energies
Volume
16
Issue
1
First Page
455
Year
2022
Publication Date
2022-12-31
ISSN
1996-1073
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Original Submission
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PII: en16010455, Publication Type: Journal Article
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LAPSE:2023.35547
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https://doi.org/10.3390/en16010455
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May 2, 2023
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