Molybdenum-based compounds and their composites were investigated as an alternative to Pt for hydrogen evolution reactions. The presence of interfaces and junctions between MoN and MoS grains in the composites were investigated to understand their role in electrochemical processes. Here we found that the electrocatalytic activity of MoN nanostructures was enhanced remarkably by conjugation with few-layer MoS sheets. The electrocatalytic performance of MoN-MoS composites in the hydrogen evolution reaction (HER) was revealed from the high catalytic current density of ∼175 mA cm (at 400 mV) and good electrochemical stability (more than 18 h) in acidic media. Increasing the amount of MoS in the composite, decreases the HER activity. The mechanism and kinetics of the HER process on the MoN-MoS surface were analyzed using Tafel slopes and charge transfer resistance.
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