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Torres-Gonzalez J.,Center for Research and Technological Development in Electrochemistry | Castaneda F.,Center for Research and Technological Development in Electrochemistry | Benaben P.,Ecole Nationale Superieure des Mines de Saint - Etienne CMP
Leonardo Electronic Journal of Practices and Technologies

Chromium multilayers deposits were obtained from three different bath solutions, they were prepared by switching current density between 10 and 70 Adm-2. Two temperatures were studied, 35°C and 55°C. At 35°C two different microstructures are alternated: Columnar obtained at 10 Adm-2 and equiaxial obtained at 70 Adm-2. At 55°C only the columnar type microstructure is present, at 10 and 70 Adm-2, the only difference among the layers is a slight disorientation of grains. The properties of these chromium multilayers were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). In general the deposits are microcracked with a high microhardness, high residual stress and a small grain size. © 2010 by the authors. Source

Cerritos R.C.,Center for Research and Technological Development in Electrochemistry | Cerritos R.C.,University of Guanajuato | Guerra-Balcazar M.,Autonomous University of Queretaro | Ramirez R.F.,University of Guanajuato | And 2 more authors.

In the present study, three different structures with preferentially exposed crystal faces were supported on commercial carbon black by the polyol method (nanoparticles (NP/C), nanobars (NB/C) and nanorods (NR/C)). The electrocatalysts were characterized by XRD, TEM, TGA and cyclic voltammetry at three different ethanol concentrations. Considerable differences were found in terms of catalytic electroactivity. At all ethanol concentrations, the trend observed for the ethanol oxidation peak potential was preserved as follows: NB/C < NP/C< NR/C < commercial Pd/C. This result indicates that, from a thermodynamics point of view, the NB/C catalyst enclosed by Pd(100) facets presented the highest activity with respect to ethanol electro-oxidation among all of the catalysts studied. © 2012 by the authors. Source

Medel A.,Center for Research and Technological Development in Electrochemistry | Patino D.,Center for Research and Technological Development in Electrochemistry | Mendez E.,Center for Research and Technological Development in Electrochemistry | Mendez E.,Autonomous University of Puebla | And 6 more authors.
Environmental Engineering and Management Journal

This research evaluated two electrokinetic remediation systems (EKR) for separating phenanthrene from bentonite and its electrochemical destruction by using a Boron Doped Diamond (BDD) electrode. The effect of the electrochemical potential for the oxidation of phenanthrene in liquid phase with Ti/BDD was analyzed by Normal Pulse Voltammetry and Hydroxyl Radical (●OH) analysis using the Spin Trapping Technique. The results showed that 70% of phenanthrene was removed from bentonite through EKR by applying 20 mA for 4 h in alkaline conditions, and that phenanthrene in solution was 100% degraded with Ti/BDD by applying 2.3 V vs Hg|Hg2SO4, for 2.5 h. These results demonstrate the potential application of the electrochemical technology in treating soils contaminated with highly toxic compounds, such as Polyaromatic Hydrocarbons (PAHs) and their final destruction using the EKR-BDD process. © 2015, Gh. Asachi Technical University of Iasi. Source

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