Effect of current density on Ni-Mo electrodeposition using EMIM [Br

Abstract

ABSTRACTThis study was conducted to investigate the current density impact on the Ni-Mo electrodeposit and on its catalytic activity of methanol oxidation in an alkaline solution. For this purpose, Ni-Mo coatings with good electrocatalytic properties were achieved by electrodeposition in the modified Watts bath containing 1-ethyl-3-methyl imidazolium bromide (EMIM [Br]) ionic liquid. The results showed that a 1–6 A dm−2 increase in the current density could decline the Mo content in the Ni-Mo/Ni coatings. The XRD patterns demonstrate that an amorphous coating formed with increasing the current density. Moreover, it was found that the catalytic performance of Ni-Mo coatings was significantly enhanced in the presence of methanol. Based on the obtained results, the Ni-Mo coating obtained at the current density of 3.5 A dm−2 and in the presence of EMIM [Br] showed a higher anodic current density, lower onset oxidation potential, and better catalytic performance.