The two-electron reduction of molecular oxygen represents an effective strategy to enable the green,mild and on-demand synthesis of hydrogen peroxide.Its practical viability,however,hinges on the development of advanced electrocatalysts,preferably composed of non-precious elements,to selectively expedite this reaction,particularly in acidic medium.Our study here introduces 2H-MoTe2 for the first time as the efficient non-precious-metal-based electrocatalyst for the electrochemical production of hydrogen peroxide in acids.We show that exfoliated 2H-MoTe2 nanoflakes have high activity (onset overpotential ～140 mV and large mass activity of 27 A g-1 at 0.4 V versus reversible hydrogen electrode),great selectivity (H2O2 percentage up to 93％) and decent stability in 0.5 M H2SO4.Theoretical simulations evidence that the high activity and selectivity of 2H-MoTe2 arise from the proper binding energies of HOO* and O* at its zigzag edges that jointly favor the two-electron reduction instead of the four-electron reduction of molecular oxygen.