Eletrodeposição e caracterização de revestimentos de Ni-Co obtidos a partir de solvente eutético profundo aplicados para eletrocatálise de reações de evolução de hidrogênio

Abstract

Given the growing demand for sustainable energy sources, green hydrogen emerges as a promising alternative. This study aimed to evaluate the electrocatalytic performance of Nickel (Ni) coatings and Nickel-Cobalt (Ni-Co) alloys, obtained by electrodeposition from Deep Eutectic Solvents (DES) composed of choline chloride and urea, applied to the Hydrogen Evolution Reaction (HER). The coatings were deposited on copper substrates and characterized by cyclic voltammetry, Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). The results highlighted that the addition of cobalt significantly altered the morphology, chemical composition, and catalytic efficiency of the coatings. The Ni􁁼􁁾Co􁁷􁁶 sample stood out, presenting the lowest overpotential (η􁁶􁁵) of 45 ± 8.7 mV, even surpassing the values found in the literature for similar conditions. In conclusion, the combination of DES with controlled deposition provided efficient, stable, and low-cost electrocatalysts, making them viable for green hydrogen production