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A simple two-step strategy to synthesize defect-rich MoS2nanocrystals for enhanced electrochemical hydrogen evolution

Sahoo, D and Shakya, J and Choudhry, S and Singh, B and Kaviraj, B (2022) A simple two-step strategy to synthesize defect-rich MoS2nanocrystals for enhanced electrochemical hydrogen evolution. In: AIP Advances, 12 (3).

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Official URL: https://doi.org/10.1063/5.0083934


MoS2 based materials are considered the most reliable alternative catalysts for the hydrogen evolution reaction (HER), where engineering of active sites has emerged as an acceptable approach to tune their HER activity. In this approach, the dispersion of bulk MoS2 in the aqueous phase was increased with a surfactant (sodium dodecyl sulfate), which reduced the exfoliation time and enhanced the exfoliation ability to produce layered MoS2 nanosheets. During the hydrothermal treatment, the nanosheets were further scissored into small nanocrystals. Nanocrystals have attractive properties with stable dispersion and high-water solubility. Our method provides a scalable, eco-friendly, easy, and low-cost strategy for designing other HER catalysts. Such ultra-small MoS2 nanocrystals with rich Mo vacancies were used as catalysts for HER, which showed excellent electrocatalytic activity with a low overpotential (95 mV) and small Tafel slope (41 mV/dec) in 0.5M H2SO4 electrolyte. The design and synthesis of the HER catalyst in this work presents a promising path for preparing active and stable electrocatalysts to replace costly metal-based catalysts for hydrogen production. © 2022 Author(s).

Item Type: Journal Article
Publication: AIP Advances
Publisher: American Institute of Physics Inc.
Additional Information: The copyright for this article belongs to the authors
Keywords: Catalyst activity; Dispersions; Electrocatalysts; Electrolytes; Hydrogen production; Layered semiconductors; Molybdenum compounds; Nanocrystals; Nanosheets; Sodium dodecyl sulfate, Active site; Alternative catalysts; Aqueous phasis; Electrochemicals; Hydrogen evolution reaction activities; Hydrogen evolution reactions; Hydrogen-evolution; Simple++; Two-steps strategy; ]+ catalyst, Sulfur compounds
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 15 May 2022 08:45
Last Modified: 15 May 2022 08:45
URI: https://eprints.iisc.ac.in/id/eprint/71685

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