In the realm of material science, the pursuit of innovative and sustainable electrodeposition techniques has led researchers to explore the use of deep eutectic solvents (DES). This article delves into the fascinating world of X-ray photoelectron spectroscopy (XPS) and its role in unraveling the mysteries of Ni and Ni-SiO2 coatings electrodeposited from DES-based electrolytes. The authors, Mehry Fattah and Sylvie Morin, embark on a journey to understand the intricate interplay between residual water, electrolyte components, and the deposited nickel during the electrodeposition process. With a keen eye for detail, they employ XPS to probe the composition of the compounds formed on the electrode surface, shedding light on the formation of Ni hydroxide and oxide, as well as the presence of nickel chloride. The study reveals that the addition of SiO2 nanoparticles significantly influences the interactions between the residual water and the deposited nickel, leading to a decrease in the amount of Ni hydroxide and oxide. This reduction is attributed to the interference of the agitated nanoparticles in the stirring electrolyte with cathode surface processes. The authors also explore the impact of residual water content on the microstructure and hardness of the coatings, finding that a small amount of residual water promotes the formation of nanostructured Ni crystallites, resulting in enhanced surface hardness. Furthermore, the study highlights the environmental benefits of DES-based electrolytes, supporting the establishment of a green approach for fabricating durable corrosion-resistant coatings. In conclusion, this research provides valuable insights into the complex world of electrodeposition and opens up new avenues for the development of sustainable and high-performance coatings.
