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Article

Microwave-Assisted vs. Conventional Hydrothermal Synthesis of MoS2 Nanosheets: Application towards Hydrogen Evolution Reaction

1
Division of Materials Science, Department of Engineering Science and Mathematics, Luleå University of Technology, 971 87 Luleå, Sweden
2
CNR-Institute of Microelectronics and Microsystem (IMM), Section of Bologna Via Piero Gobetti 101, 40129 Bologna, Italy
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(11), 1040; https://doi.org/10.3390/cryst10111040
Received: 16 October 2020 / Revised: 3 November 2020 / Accepted: 10 November 2020 / Published: 16 November 2020
Molybdenum sulfide (MoS2) has emerged as a promising catalyst for hydrogen evolution applications. The synthesis method mainly employed is a conventional hydrothermal method. This method requires a longer time compared to other methods such as microwave synthesis methods. There is a lack of comparison of the two synthesis methods in terms of crystal morphology and its electrochemical activities. In this work, MoS2 nanosheets are synthesized using both hydrothermal (HT-MoS2) and advanced microwave methods (MW-MoS2), their crystal morphology, and catalytical efficiency towards hydrogen evolution reaction (HER) were compared. MoS2 nanosheet is obtained using microwave-assisted synthesis in a very short time (30 min) compared to the 24 h hydrothermal synthesis method. Both methods produce thin and aggregated nanosheets. However, the nanosheets synthesized by the microwave method have a less crumpled structure and smoother edges compared to the hydrothermal method. The as-prepared nanosheets are tested and used as a catalyst for hydrogen evolution results in nearly similar electrocatalytic performance. Experimental results showed that: HT-MoS2 displays a current density of 10 mA/cm2 at overpotential (−280 mV) compared to MW-MoS2 which requires −320 mV to produce a similar current density, suggesting that the HT-MoS2 more active towards hydrogen evolutions reaction. View Full-Text
Keywords: molybdenum sulfide; transition metals sulfides; hydrogen evolution reaction; electrocatalyst; microwave; hydrothermal; MoS2 nanosheets molybdenum sulfide; transition metals sulfides; hydrogen evolution reaction; electrocatalyst; microwave; hydrothermal; MoS2 nanosheets
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MDPI and ACS Style

Solomon, G.; Mazzaro, R.; Morandi, V.; Concina, I.; Vomiero, A. Microwave-Assisted vs. Conventional Hydrothermal Synthesis of MoS2 Nanosheets: Application towards Hydrogen Evolution Reaction. Crystals 2020, 10, 1040. https://doi.org/10.3390/cryst10111040

AMA Style

Solomon G, Mazzaro R, Morandi V, Concina I, Vomiero A. Microwave-Assisted vs. Conventional Hydrothermal Synthesis of MoS2 Nanosheets: Application towards Hydrogen Evolution Reaction. Crystals. 2020; 10(11):1040. https://doi.org/10.3390/cryst10111040

Chicago/Turabian Style

Solomon, Getachew, Raffaello Mazzaro, Vittorio Morandi, Isabella Concina, and Alberto Vomiero. 2020. "Microwave-Assisted vs. Conventional Hydrothermal Synthesis of MoS2 Nanosheets: Application towards Hydrogen Evolution Reaction" Crystals 10, no. 11: 1040. https://doi.org/10.3390/cryst10111040

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