Browsing by Author "Aguirre, M. J."
Now showing 1 - 8 of 8
Results Per Page
Sort Options
- ItemCarbon neutral electrochemical conversion of carbon dioxide mediated by [Mn+(cyclam)Cl-n] (M = Ni2+ and Co3+) on mercury free electrodes and ionic liquids as reaction media(2017) Honores Sotelo, Jessica Scarlet; Quezada Sandoval, Diego Alonso; García, M.; Calfuman, K.; Muena, J. P.; Aguirre, M. J.; Arévalo, M. C.; Isaacs Casanova, Mauricio; Honores Sotelo, Jessica Scarlet; Quezada Sandoval, Diego Alonso; García, M.; Calfuman, K.; Muena, J. P.; Aguirre, M. J.; Arévalo, M. C.; Isaacs Casanova, Mauricio
- ItemCritical Comparison between Modified Monier-Williams and Electrochemical Methods to Determine Sulfite in Aqueous Solutions(2012) Montes, C.; Vélez Cifuentes, Jorge; Ramírez Jofré, Galo; Isaacs Casanova, Mauricio; Arce, R.; Aguirre, M. J.
- ItemElectro-reduction of Oxygen to Water Mediated by Stable Glassy Carbon Electrodes Modified by Co(II)-porphyrins with Voluminous Meso-Substituent(2015) Marin, A., V; Aguirre, M. J.; Muena, J. P.; Dehaen, W.; Maes, W.; Ngo, Thien H.; Ramirez, G.; Arevalo, M. C.Glassy carbon electrodes were modified by physisorption of two different Co(II)-porphyrins, specifically designed and synthesized to study the effect of the substitution pattern (and the resulting steric hindrance) on the electrocatalytic behavior for a characteristic inner-sphere reaction such as the reduction of oxygen. In spite of the change in morphology caused by a change in the relative positions of the meso substituents, they showed practically the same behavior toward the electro-reduction of O-2. In both cases, water was obtained as the main product. The modified electrodes were also active toward the electro-reduction of hydrogen peroxide. Both electrodes were found stable for more than a month upon exposure to air and the current for the electro-reduction remained practically the same.
- ItemElectrocatalytic reduction of carbon dioxide on conducting glass electrode modified with polymeric porphyrin films containing transition metals in ionic liquid medium(2014) Quezada, D.; Honores Sotelo, Jessica Scarlet; Aguirre, M. J.; Isaacs Casanova, Mauricio
- ItemELECTROOXIDATION OF SULFITE AT CARBON PASTE ELECTRODE MODIFIED WITH IONIC LIQUIDS DERIVATED OF N-OCTYL-PYRIDINIUM HEXAFLUOROPHOSPHATE WITH DIFFERENT SUBSTITUENTS IN THE CATION(2017) Fuenzalida, F.; García, C.; García, M.; Arce, R.; Baez, C.; Aguirre, M. J.; Isaacs Casanova, Mauricio; Arévalo, M. D.
- ItemHydrogen evolution reaction highly electrocatalyzed by MWCNT/N-octylpyridinum hexafluorophosphate metal-free system(2021) Gidi, Leyla; Arce, Roxana; Ibarra, Jose; Isaacs, M.; Aguirre, M. J.; Ramirez, GaloA mixed electrocatalyst that consists of multi walled carbon nanotubes (MWCNTs) and the ionic liquid (IL) N-octylpyridinum hexafluorophosphate (OPyPF6) as binder (MWCNT/IL system) was used in the study of hydrogen evolution reaction. This electrocatalyst was compared to graphite/mineral oil (Gr), graphite/OPyPF6 (Gr/IL), MWCNT/mineral oil (MWCNT) systems. All systems were characterized by cyclic voltammetry determining that MWCNT/IL system is highly electrocatalytic (E onset = -0.3 V vs Ag/AgCl) in relation to the other systems studied containing MWCNT or IL separately. The presence of each of the components that form the electrodic surface is corroborated by XRD, Raman, and FESEM-EDX, and it is demonstrated by chronoamperometric analysis that MWCNT/IL system is highly stable. The efficiency of the electrode, determined by its electrocatalytic activity, is confirmed by the quantification by gas chromatography of the hydrogen produced. Moreover, an elevated TON value (16274) and faradaic efficiency close to 60% are calculated, in comparison to other electrocatalysts found in literature. All these attractive properties are complemented by the fact that the MWCNT/IL system is simple, novel and easy to prepare. (C) 2021 Elsevier Ltd. All rights reserved.
- ItemIron porphyrin-modified electrodes: influence of the method of modification on the stability and electroactivity in oxidation of sulfite or hydrogensulfite in ethanol-water solutions(2009) Ramirez Ortiz, Gisela; Goya, M.C.; Mendoza, L.; Matsuhiro, B.; Isaacs Casanova, Mauricio; Chen Carrillo, Yo-Ying Adriana; Arevalo, M.C.; Henriquez, J.; Cheuquepan, W.; Aguirre, M. J.
- ItemStudy of the Hydrogen Evolution Reaction Using Ionic Liquid/Cobalt Porphyrin Systems as Electro and Photoelectrocatalysts(MDPI, 2020) Gidi, Leyla; Honores, Jessica; Ibarra, Jose; Arce, Roxana; Aguirre, M. J.; Ramirez, GaloIn this work, the design and manufacture of graphite paste (Gr) electrodes is carried out, including N-octylpyridinium hexafluorophosphate (OPyPF6) ionic liquid (IL) as binder and modification with Co-octaethylporphyrin (Co), in order to study the hydrogen evolution reaction (HER) in the absence and presence of light. The system is characterized by XRD and FESEM-EDX (Field Emission Scanning Electron Microscopy with Energy Dispersive X-Ray Spectroscopy), confirming the presence of all the components of the system in the electrode surface. The studies carried out in this investigation confirm that a photoelectrocatalytic system towards HER is obtained. The system is stable, efficient and easy to prepare. Through cyclic voltammetry and electrochemical impedance spectroscopy, was determined that these electrodes improve their electrochemical and electrical properties upon the addition of OPyPF6. These effects improve even more when the systems are modified with Co porphyrin. It is also observed that when the systems are irradiated at 395 nm, the redox process is favored in energy terms, as well as in its electrical properties. Through gas chromatography, it was determined that the graphite paste electrode in the presence of ionic liquid and porphyrin (Gr/IL/Co) presents a high turnover number (TON) value (6342 and 6827 in presence of light) in comparison to similar systems reported.