Centro de Investigación y Desarrollo Tecnológico en Electroquímica

About: Centro de Investigación y Desarrollo Tecnológico en Electroquímica is a based out in . It is known for research contribution in the topics: Cyclic voltammetry & Catalysis. The organization has 537 authors who have published 682 publications receiving 10382 citations. The organization is also known as: Centro de Investigacion y Desarrollo Tecnologico en Electroquimica & Center of Research and Technologic Development in Electrochemistry.

Study of the photo-electrochemical activity of cobalt- and nickel-doped TiO2 photo-anodes for the treatment of a dye-contaminated aqueous solution

Abstract: The photo-electrochemical activity of Co- and Ni-doped TiO2 electrodes was studied using an aqueous solution containing an organic dye (Orange II) as a model polluted effluent. The results showed not only that both dopant species increased the activity of the photo-anode toward the dye color degradation but also that a specific proportion of the dopant materials maximized this effect. Interestingly, the best performance in the photo-electrochemical dye degradation process for the two doped materials was obtained using a 20 wt% doping synthetic proportion; achieving in both cases close to 90 % color removal during the first 10 min of reaction time. Employing the Langmuir–Hinshelwood formalism, the dopant effect was measured in terms of an increase in the kinetic rate coefficient and a coupled decrease in the dye adsorption equilibrium constant. In this way, while the surface rate constant (k c) for the doped materials were found to be 3.3 (Co) and 2.7 (Ni) times higher than that of the un-doped TiO2, the L–H adsorption constant were calculated as 0.083, 0.021, and 0.036 (mgL−1)−1 for the TiO2, Co- and Ni-doped materials, respectively. The results from additional experiments that followed the temporal evolution of the concentration of electro-generated H2O2 suggested a Fenton-like effect with regard to the anode performance caused by the doping species in the semiconductor anode.

Characterization and corrosion resistance of electroless black Ni-P coatings of double black layer on carbon steel

Abstract: In this work, the corrosion evaluation of a double black layer, by an acidic bath of double electroless Ni-P coatings, were conducted. A double black layer and a coarse sandblast finishing were intended for increasing the sunlight absorption and its anchoring. The surface preparation process comprises four stages: A) a Ni-P electroless coating, B) an acidic attack for a black layer formation, C) a second Ni-P electroless coating, and D) an acidic attack for a second black layer. The properties of the coating were investigated by X-ray diffraction, scanning electron microscopy, mechanical profilometry, confocal laser scanning microscopy and low-discharge optical emission spectroscopy. The results of these studies indicate that a double layer Ni-P coating with Rp and corrosion rate values of 1170 Ω cm2 and 0.4 mm/year were obtained, thereby exhibiting an increase in corrosion resistance compared to a one layer Ni-P coating. The GDOES profiles show two Ni-P coatings and two black layers intercalated through small variations of the percentage of nickel and phosphorus, which was associated with the interface between both layers.