engleski

Experimental study and modeling of the her on glassy carbon supported porous ni-mo electrodes

The electrochemical activity towards the HER (hydrogen evolution reaction) of Ni and Ni-Mo electrodes, electrodeposited onto glassy carbon, was studied in 0.5 M H2SO4 by linear polarization and EIS (electrochemical impedance spectroscopy) techniques. Porosity of the electrodes, displayed on SEM micrographs, is substantiated by the EIS results that were further analyzed by the porous electrode model. The outstanding HER activity of Ni-Mo catalyst is due to the synergistic effect that emerges upon alloying of the hypo and hyper d metals as well as to the large surface area of the electrodeposited electrodes. Obtained results are discussed with respect to the available literature experimental data and within the framework of the classical and some current theories, including modeling of the alloys of various compositions by the density functional theory calculations. These calculations reveal rather precise electronic structure of the alloy, thereby, enabling estimation of its influence on the HER activity.

electrocatalysis; Ni-Mo catalyst; hydrogen evolution; synergistic effect; electrodeposition

nije evidentirano