Abstract Scope |
This study explores laser micro- and nano-machining to modify nickel electrode surfaces, controlling wettability and oxide layer composition. A straightforward one/two-step method was used to produce micro, nano, and hierarchical patterns, including laser-induced periodic surface structures (LIPSS) on nickel electrodes. Using the Box–Behnken design of experiments (DOE), laser parameters were optimized. Electrochemical methods such as linear sweep voltammetry and electrochemical impedance spectroscopy (EIS) assessed overpotential, Tafel slope and polarization resistance for the Hydrogen evolution reaction (HER). High-speed cameras were employed to investigate the bubble evolution and mechanism whereas X-ray photoelectron spectroscopy (XPS) analysed the passive layer's surface composition. Relationships between laser parameters, surface roughness, wettability, overpotential, and Tafel slope were established to optimize our approach of nickel electrode fabrication for water splitting applications. Thus, this advanced approach provides a pathway for the simplistic design and development of surface modification techniques, contributing to advanced materials for the green hydrogen economy. |