In this work, highly monodispersed Pt-Ni alloy nanoparticles were directly deposited on carbon substrate through a facile electrodeposition strategy in the solvent system of N,N-dimethylformamide (DMF). A series supported electrocatalysts synthesized under different applied electrode potentials. Among all as-obtained samples, Pt-Ni/C electrocatalyst at –1.73 V exhibits optimal specific activity...