Molybdenum disulfide has drawn persistent interest as a promising nonprecious electrocatalyst alternative to Pt for the hydrogen evolution reaction (HER). However, the MoS catalytic efficiency is still lower than the Pt-based catalysts owing to insufficient active sites with more inert basal planes. Herein, we designed and synthesized porous MoS nanosheets to activate the basal planes by etching away Al in Al-doped MoS . The optimized porous MoS shows a small onset overpotential as low as 136 mV, a large cathode current density of 10 mA cm at η=201 mV, a low Tafel slope of 62 mV decade , and a high TOF of 0.29 H s per active site at η=200 mV. This study opens up new avenues for designing electrocatalysts based on porous MoS or other layered materials with enhanced HER performance.
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