Browsing by Author "Zagal, J. H."

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    Reactivity 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 Javier
    Following 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.
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    Theoretical 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