Advancements in the search for efficient H 2 evolving electrocatalysts by engineering the structure and electronic properties of bulk materials at the nano regime have had a constructive impact on realizing better performance with ultralow catalyst loading. In this work, we investigate the electrochemical hydrogen evolution catalysis of WS 2 quantum dots (QDs) synthesized electrochemically. WS 2 QDs were evaluated for a hydrogen evolution reaction (HER) in 0.5 M H 2 SO 4 as a binder-less electrocatalyst, which necessitated a low HER onset of 190 mV and reached -200 mA cm -2 at 473 mV. In contrast, the bulk WS 2 exhibited a poor performance, which required 780 mV to drive -50 mA cm -2 . The electrochemical disintegration of bulk WS 2 into QDs is the key behind such activation.
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