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  • Title: Ultrathin molybdenum disulfide/carbon nitride nanosheets with abundant active sites for enhanced hydrogen evolution.
    Author: Qian X, Ding J, Zhang J, Zhang Y, Wang Y, Kan E, Wang X, Zhu J.
    Journal: Nanoscale; 2018 Jan 25; 10(4):1766-1773. PubMed ID: 29308801.
    Abstract:
    The exploration of highly active catalysts for hydrogen evolution reaction (HER) is beneficial to realize high catalytic activity and enhance kinetics for water splitting. Herein, flower-like molybdenum disulfide/carbon nitride (MoS2/C3N4) nanosheets with thickness of 4.6 nm and enlarged interlayer spacing of 0.64 nm were synthesized via a facile hydrothermal method. As expected, the ultrathin thickness endowed MoS2/C3N4 with abundant active sites, ensuring outstanding catalytic activity and excellent stability for HER in alkaline electrolyte. MoS2/C3N4 nanocomposites can offer an onset overpotential of 153 mV versus reversible hydrogen electrode (RHE). Notably, the Tafel slope value is only 43 mV dec-1, which is significantly better than those of reported MoS2-based hydrogen evolution catalysts, revealing superior HER performance of MoS2/C3N4, particularly in catalytic kinetics. More significantly, density functional theory (DFT) calculations further verify that rich active sites confined in ultrathin nanostructure of g-C3N4 nanolayers could increase the activity of MoS2/C3N4 and result in enhanced HER efficiency. This study indicates that rational interaction between two different 2D materials can significantly facilitate H2 generation, which endows extraordinary HER activity.
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