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The design and development of inexpensive highly efficient electrocatalystsfor hydrogen production, underpins several emerging clean-energy technologies.In this work, for the first time, molybdenum disulfide (MoS2) nanodots havebeen synthesized by ionic liquid assisted grinding exfoliation of bulkplatelets and isolated by sequential centrifugation. The nanodots have athickness of up to 7 layers (4 nm) and an average lateral size smaller than 20nm. Detailed structural characterization established that the nanodots retainedthe crystalline quality and low oxidation states of the bulk material. Thesmall lateral size and reduced number of layers provided these nanodots with aneasier path for the electron transport and plentiful active sites for thecatalysis of hydrogen evolution reaction (HER) in acidic electrolyte. The MoS2nanodots exhibited good durability and a Tafel slope of 61 mVdec-1 with anestimated onset potential of -0.09 V vs RHE, which are considered among thebest values achieved for 2H phase. It is envisaged that this work may provide asimplistic route to synthesize a wide range of 2D layered nanodots that haveapplications in water splitting and other energy related technologies.KEYWORDS: MoS2 nanosheets, hydrogen evolution reaction, electrocatalysis,edges, nanodots, ionic liquid exfoliation, water splitting

Electrocatalytic Hydrogen Evolution Reaction on Edges of a Few Layer Molybdenum Disulfide Nanodots