STUDY OF THE HYDROGEN EVOLUTION REACTION ON NI-MO-P ELECTRODES IN ALKALINE-SOLUTIONS

Nickel-molybdenum-phosphorous electrodes were prepared by electrodepos ition, and their activity for the hydrogen evolution reaction was stud ied in 1 M NaOH using electrochemical impedance spectroscopy and stead y-state polarization techniques. Active and stable electrodes were obt ained by deposition of three successive layers of Ni, Ni-P, and Ni-Mo- P and creating a concentration gradient in the topmost layer. It was f ound that the increase in electrode activity was due to increases in b oth the surface roughness and the intrinsic activity, as compared with Ni-P, Ni-Mo, and Ni electrodes. The reaction mechanism and the kineti c parameters were determined.