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

Abstract

The present work aimed to electrodeposit and characterize Nickel-Indium (Ni-In) coatings obtained from Deep Eutectic Solvents (DES) for application in electrocatalysis of hydrogen evolution reactions (HER). The research seeks to contribute to the development of alternative and sustainable materials for the production of green hydrogen, a clean and renewable energy source. The methodology included the preparation of electrolytes based on choline chloride and urea (1ChCl:2U), electrodeposition on copper substrates, morphological, chemical, and electrochemical characterization of the coatings, as well as tests of electrocatalytic efficiency in 1M KOH solution. The Ni-In coatings exhibited morphological characteristics that were sensitive to the In content, varying from smoother, granular to more compact layers, favoring high electrocatalytic activity. The results showed that the Ni-In alloys significantly reduced the overpotential required for hydrogen evolution, proving to be more efficient compared to pure copper substrates. Therefore, the proposed methodology is promising for the production of lowcost, high-performance catalysts, offering a viable alternative to the use of noble metals such as platinum. This work reinforces the relevance of DES in the synthesis of metallic coatings and paves the way for future research in the field of sustainable energy transitio