This research evaluated the electrocatalytic activity of palladium-based nanostructures supported on graphene oxide, GO, for the formic acid (FAER) and methanol electro-oxidation reactions (MER), both of which are relevant to applications in fuel cells (FCs). The latter is a sustainable alternative for, clean energy generation, efficient, dependable at usually greater efficiencies (40-70%) compared with internal combustion fossil fuel burning engines. Presently, such electrochemical devices have gained significant attention almost worldwide as can be gathered from numerous research reports and papers, which indicate that considerable financing and infrastructure have been dedicated, although large fractions of them are devoted to development and testing of the electrocatalysts that are the core of the electrochemical devices serving widespread energy-consuming clientele. Naturally, the FCs will need to warrant prolonged service times at the lowest cost possible. Innovation in this field of science and engineering addresses the synthesis of nanometric materials capable of impelling the electrochemical reactions that sustain the fundamental redox reactions on which this technology rests. This investigation focused on the nanomaterial synthesis through the impregnation and combustion methods, using Pd and another transition metal, as in 10% Pd and 10% M, where the capital letter refers to the metal used (Co, Cu or Rh). The proportions used to form the electrocatalysts were 20% alloyed nanoparticles, and 80% GO as support material. Controlling the amounts of metals precursor and reducing agent aided in the electrocatalytic activity evaluation of FAER and MER, through the steadystate current density. PdCu/GO, and PdCo/GO nanostructures in 1:1 ratio that were synthesized with combustion method exhibited the largest electrocatalytic activity for FAER and MER respect to the other synthesized

In this work, the catalytic activity of copper-palladium (Cu-Pd) nanoparticles (NPs) is studied for formic acid oxidation. The Cu-Pd NPs were synthesized in a toluene/water system at room temperature. The synthesis of organic phase containing the metal ions was carried out as follows: the aqueous solutions containing the cooper and palladium metals ions, Cu(NO3)2 and PdCl2. Cu and Pd were mixed in appropriate amounts to obtain aqueous solution with 1:1 molar ratios of Cu:Pd. The toluene solution of hexadecylamine (C16H33NH2) was added to the Cu and Pd aqueous solution under strong stirring. For the mixture solution, an immediate two-layer separation was produced, with a light yellow organic phase on the top and a yellow tinted aqueous phase on the bottom. Ions were allowed to diffuse gradually into the organic phase by complexing them with the amine. Cu-Pd NPs were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and energy dispersive X-ray (EDX) analysis. The catalytic activity of Cu-Pd NPs was evaluated for formic acid oxidation, using the anodic current density. The electrochemical result shows that Cu-Pd NPs present a higher catalytic activity than Pd NPs.

En el presente trabajo se analizó el efecto de la eficiencia de inhibición del acero 1045, modificado superficialmente con electrodepósitos de zinc sintetizados en un disolvente eutéctico profundo (DES), constituido por cloruro de colina con urea (conocido como reline) y cloruro de zinc al aplicar diferentes potenciales. La evaluación electroquímica fue realizada por curvas de polarización potenciodinámicas para obtener la densidad de corrosión y la eficiencia de inhibición de los diferentes electrodepósitos de zinc. Las superficies del acero 1045 fueron caracterizadas mediante microscopía óptica para evaluar las modificaciones debidas al proceso de corrosión en el medio ácido.