RT info:eu-repo/semantics/article
T1 Nickel-based composites with Mo2C and TiC for improved electrocatalytic performance of HER
A1 Pastor Tejera, Elena María
A1 Loiacono, Antonella
A1 Calderón, Juan Carlos
A1 Lacconi, Gabriela I.
A1 Rodríguez Marrero, José Luis
A1 Franceschini, Esteban A.
A2 Química
A2 Instituto Universitario de Materiales y Nanotecnología
CISEL - Ciencia de superficies y electrocatálisis
AB The development of efficient and sustainable catalysts for hydrogen evolution reaction (HER) is critical to thedevelopment of renewable energy technologies. Nickel-based catalysts, particularly those derived from Ni-Wattselectrodeposition baths have shown significant potential due to their cost effectiveness and catalytic activity.This study investigates the effects of incorporating transition metal carbides, specifically molybdenum carbide(Mo₂C) and titanium carbide (TiC), into nickel electroplating baths to improve electrochemical performance. Bysystematically varying the concentrations of Mo₂C and TiC, we are evaluating their effect on the structural andcatalytic properties of the resulting nickel-based composites. Characterization techniques including X-raydiffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy and confocal microscopyshow that the addition of these carbides alters the crystallographic orientation of nickel matrix, increases thesurface roughness and improves the active surface area of the catalysts. Electrochemical tests including cyclicvoltammetry, electrochemical impedance spectroscopy and differential electrochemical mass spectrometry showthat the modified composites exhibit enhanced HER activity compared to conventional Ni-Watts catalysts. Differential electrochemical mass spectrometry (DEMS) was used to accurately determine the onset potential andTafel slopes for the materials in NaOH 0.1 M media, showing the lowest onset potentials and most favored kinetics for the composites containing TiC. These findings provide valuable insights into the design of durable,efficient electrocatalysts for HER applications, which are prepared by the one-step electrodeposition technique.This fact means that this procedure simplifies electrode fabrication, offering practical advantages for large-scalehydrogen production
YR 2025
FD 2025
LK http://riull.ull.es/xmlui/handle/915/41948
UL http://riull.ull.es/xmlui/handle/915/41948
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 13-nov-2025