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Electrochemical behavior of europium perovskites (Ca0.6Eu0.4MnO3) in alkaline aqueous media

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Abstract

In this paper, the electrochemical behavior of europium perovskites (Ca0.6Eu0.4MnO3) prepared by a gel combustion method followed by a thermal treatment performed at 1073 and 1473 K is compared with the pristine oxide CaMnO3 (T = 1073 K) obtained by the same method. The experiments were performed in alkaline aqueous media via open-circuit potential, cyclic voltammetry, chronopotentiometry, and impedance spectroscopy. The data show that the electrode roughness is inversely proportional to the oxide particle size. The chronopotentiometric curves show also that the presence of europium is advantageous due to the increase of the electrode roughness for the oxides formed at the same temperature (1073 K) or by increasing the charge per unit area for the oxide formed at 1473 K. The impedance spectra, which were obtained in the capacitive behavior domain, reflect the porous morphology of the electrode surfaces according to the theory developed by Levie. This feature is particularly evident for the electrodes with an average particle diameter of 90 and 60 nm, corresponding respectively to the oxides CaMnO3 and Ca0.6Eu0.4MnO3, both formed at 1073 K.

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Acknowledgments

M.E. Melo Jorge thanks Fundação para a Ciência e Tecnologia (FCT) for funding (UID/MULTI/00612/2013). Acknowledgments are also due to Laboratório Nacional de Energia e Geologia (LNEG) in the framework of the MESOPOROUS project.

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Authors and Affiliations

  1. Unidade de Energia Solar, Laboratório Nacional de Energia e Geologia, Paço do Lumiar 22, 1649-038, Lisboa, Portugal

    A. I. de Sá & C. M. Rangel

  2. Centro de Química e Bioquímica, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande C8, 1749-016, Lisboa, Portugal

    M. E. Melo Jorge

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  1. A. I. de Sá
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Correspondence to A. I. de Sá.

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de Sá, A.I., Rangel, C.M. & Jorge, M.E.M. Electrochemical behavior of europium perovskites (Ca0.6Eu0.4MnO3) in alkaline aqueous media. J Solid State Electrochem 20, 1713–1722 (2016). https://doi.org/10.1007/s10008-016-3184-9

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