Browsing by Author "Venegas Toledo, Ricardo Alberto"
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- ItemBiomimetic reduction of O2 in an acid medium on iron phthalocyanines axially coordinated to pyridine anchored on carbon nanotubes(2017) Venegas Toledo, Ricardo Alberto; Recio Cortés, Francisco Javier; Riquelme, J.; Neira, K.; Marco Sanz, José Francisco; Ponce, I.; Zagal Moya, José Heráclito; Tasca, F.
- ItemComparison of the catalytic activity for O2reduction of Fe and Co MN4 adsorbed on graphite electrodes and on carbon nanotubes(2017) Venegas Toledo, Ricardo Alberto; Recio Cortés, Francisco Javier; Zúñiga Loyola, César Antonio; Viera, Marco; Oyarzún, María Paz; Silva, Nataly; Neira, Karinna; Marco, José F.; Zagal, José H.; Tasca, Federico
- ItemExperimental reactivity descriptors of M-N-C catalysts for the oxygen reduction reaction(2020) Venegas Toledo, Ricardo Alberto; Muñoz Becerra, Karina; Candia Onfray, Christian; Marco Sanz, José Francisco; Zagal Moya, José Heráclito; Recio Cortés, Francisco Javier
- ItemLinear versus volcano correlations for the electrocatalytic oxidation of hydrazine on graphite electrodes modified with MN4 macrocyclic complexes(2014) Tasca, Federico; Recio Cortés, Francisco Javier; Venegas Toledo, Ricardo Alberto; Geraldo, Daniela A.; Sancy, Mamié; Zagal, José H.
- ItemPitting corrosion and stress corrosion cracking study in high strength steels in alkaline media(2016) Mazario, E.; Venegas Toledo, Ricardo Alberto; Herrasti, P.; Alonso, M. C.; Recio Cortés, Francisco Javier
- ItemReactivity descriptors for Cu bis-phenanthroline catalysts for the hydrogen peroxide reduction reaction(2020) Muñoz Becerra, K.; Báez, D. F.; Zagal, J. H.; Bollo, S.; Toro Labbé, Alejandro; Venegas Toledo, Ricardo Alberto; Recio Cortés, Francisco JavierFollowing previous studies where the metal-centered redox potentials of MN4 complexes are proposed as a reactivity descriptor for different electrochemical reactions, in the present work we expand this idea to a series of substituted Cu(I)-phenanthrolines adsorbed on glassy carbon electrodes as catalysts for the hydrogen peroxide reduction reaction (HPRR) in aqueous media. As the foot of the wave for HPRR on Cu-based modified electrodes is closely related to the Cu(II)/Cu(I) formal potential, we have found a linear correlation between the catalytic activity expressed as (log i)E and the E°'Cu(II)/Cu(I) redox potential of the complexes with a slope (dE°/dlogi)E close to +0.120 V dec−1, showing that the catalytic activity increases with the shift of E°'Cu(II)/Cu(I) to more positive potentials as a result of the electron-withdrawing nature of the substituents on the ligands. Moreover, the theoretical differences in the calculated chemical potentials (Δμ) of the reactive species follow a similar trend with the E°'Cu(II)/Cu(I) where a positive shift of this parameter is related with a higher Δμ and in consequence, with high catalytic activity. Furthermore, this strategy can be used for the smart design of biosensors as it was shown by the electroanalytical results.
- ItemRecent Advances of Fe-N-C pyrolyzed catalysts for the oxygen reduction reaction(2020) Muñoz Becerra, Karina; Venegas Toledo, Ricardo Alberto; Duque, Luis; Zagal, José Heráclito; Recio Cortés, Francisco JavierThis review summarizes recent advances in the development of pyrolyzed M–N–C catalysts for the oxygen reduction reaction, focusing on activity, stability, and the reactivity descriptors proposed for the rational design of pyrolyzed M–N–C catalysts. We discuss the last advances in achieving high catalytic activity and stability and the new insights into the characterization of FeN4 active sites by Mössbauer spectroscopy in combination with Density Functional Theory (DFT) calculations of the Fe–N–C catalysts. In addition, we present the different reactivity descriptors proposed in the literature for the rational design of Fe–N–C pyrolyzed materials: (i) structural descriptors determined by X-Ray Photoelectron Spectroscopy (XPS) and Mössbauer spectroscopy and (ii) the redox potential of the active center MNx.
- ItemTheoretical and Experimental Reactivity Predictors for the Electrocatalytic Activity of Copper Phenanthroline Derivatives for the Reduction of Dioxygen(2019) Venegas Toledo, Ricardo Alberto; Muñoz Becerra, Karina; Lemus, L.; Toro Labbé, Alejandro; Zagal, J. H.; Recio Cortés, Francisco Javier