Browsing by Author "Landaeta Campos, Esteban Alonso"
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- ItemCopper-Oxide-Coated Silver Nanodendrites for Photoelectrocatalytic CO2 Reduction to Acetate at Low Overpotential(2020) Landaeta Campos, Esteban Alonso; Masitas, R. A.; Clarke, T. B.; Rafacz, S.; Nelson, D. A.; Isaacs Casanova, Mauricio; Schultz, Z. D.
- ItemEnhanced photostability of cuprous oxide by lignin films on glassy carbon electrodes in the transformation of carbon dioxide(2018) Landaeta Campos, Esteban Alonso; Schultz, Zachary D.; Burgos, Ana; Schrebler, Ricardo; Isaacs Casanova, Mauricio
- ItemImproved ammonia production using Cu2O@poly-carbazole electrocatalysts in the electrochemical reduction of molecular nitrogen and nitrogen oxoanions(2024) Herrán Maldonado, Luis Alberto; Véliz-Silva, Diego F.; Poblete Baeza, Colin; Leiva Farias, Elías Guillermo; Honores Sotelo, Jessica Scarlet; Landaeta Campos, Esteban Alonso; Sancy Velásquez, Mamie Odette; Del Río Quero, Rodrigo Rafael; Sáez Navarrete, César Antonio; Dalchiele, Enrique; Isaacs Casanova, Mauricio AlejandroIn the present study, a Cu2O@PCz electrode for the nitrogen reduction reaction is proposed; this electrode takes advantage of the catalytic properties of Cu2O in conjunction with conducting polymers such as polycarbazole (PCz). This combination demonstrates an improvement in the catalytic activity and higher stability of this metal oxide in nitrogen electro-reduction reaction (NRR) and nitrogen oxoanion electro-reduction reaction (NORR) processes under aqueous conditions. On this basis, the material synthesized on FTO (SnO2 : F), Cu2O@PCz, exhibits a faradaic efficiency of around 38.83%, together with an NH3 productivity of 1.83 μg h−1 cm−2 in NRR type processes, on applying a potential of −0.8 V (V vs. Ag/AgCl). Similarly, in NORR type processes, the material exhibits NH3 and N2H4 productivity. The latter is the most relevant in terms of the yields obtained. Specifically, using nitrite (NO2−), an efficiency of around 77.72% was obtained, together with a formation rate of 37.02 μg h−1 cm−2 at a potential of −0.8 V (V vs. Ag/AgCl). Although N2H4 is a by-product of ammonia formation, this molecule can be considered an intermediate, which broadens the scope of this study for future research into the production of green chemicals. Finally, this research presents promising new routes for the production of NH3 at room temperature, highlighting the potential of low-cost materials, easy synthesis, and enhanced stability.
- ItemInfluence of Organic Nitrogen Derived from Recycled Wine Lees and Inorganic Nitrogen on the Chemical Composition of Cabernet Sauvignon Wines Fermented in the Presence of Non-Saccharomyces Yeasts Candida boidinii, C. oleophila, and C. zemplinina(Multidisciplinary Digital Publishing Institute (MDPI), 2024) López Lira, Claudia; Valencia, Pedro; Urtubia, Alejandra; Landaeta Campos, Esteban Alonso; Tapia, Ricardo A.; Franco Melazzini, Wendy VerónicaIn this study, the influences of inorganic nitrogen source (INS) and organic nitrogen source (ONS) supplementation during the wine fermentation process using three non-Saccharomyces yeasts (Candida zemplinina, Candida oleophila, and Candida boidinii) were analyzed. Diamine phosphate (DAP) was used as an INS, and lees enzymatic hydrolysate was used as an ONS. Complete alcoholic fermentation and a higher concentration of volatile compounds were obtained in fermentations with ONS, mainly esters from 81 to 4564 µg/L, alcohols from 231 to 7294 µg/L, and isoamyl acetate ester compounds from 12.3–22.8 ppb, with a very marked odorant activity value (OAV). In addition, malic acid was detected due to its influence on yeast metabolism and, consequently, on aroma production. Using a Y15 enzymatic autoanalyzer, residues of 1.30 g/L in ONS and 1.35 g/L in INS were obtained on the last day of alcoholic fermentation. In summary, we obtained promising results concerning the production of wine with enhanced functionalities due to higher concentrations of some volatile and polyphenolic compounds.
- ItemOn the mechanism of CO2 electro-cycloaddition to propylene oxides(2016) Gallardo, S.; Contreras R.; Isaacs Casanova, Mauricio; Honores Sotelo, Jessica Scarlet; Quezada Sandoval, Diego Alonso; Landaeta Campos, Esteban Alonso; Ormazabal, R.
- ItemPreparation, spectroscopic, and electrochemical characterization of metal( II) complexes with Schiff base ligands derived from chitosan : correlations of redox potentials with Hammett parameters(2014) Caro, C.; Cabello, G.; Landaeta Campos, Esteban Alonso; Pérez, J.; González, M.; Zagal, J.; Lillo, L.