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Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite Activity towards the Oxygen Reduction Reaction in Alkaline Media

Authors

  • Dr. Emiliana Fabbri,

    Corresponding author
    1. Electrochemistry Laboratory, Paul Scherrer Institut, Villigen-PSI, 5232 Villigen (Switzerland)
    • Electrochemistry Laboratory, Paul Scherrer Institut, Villigen-PSI, 5232 Villigen (Switzerland)

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  • Rhiyaad Mohamed,

    1. HySA/Catalysis Centre of Competence, Centre for Catalysis Research, Department of Chemical Engineering, University of Cape Town, Rondebosch, 7701 (South Africa)
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  • Dr. Pieter Levecque,

    1. HySA/Catalysis Centre of Competence, Centre for Catalysis Research, Department of Chemical Engineering, University of Cape Town, Rondebosch, 7701 (South Africa)
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  • Dr. Olaf Conrad,

    1. HySA/Catalysis Centre of Competence, Centre for Catalysis Research, Department of Chemical Engineering, University of Cape Town, Rondebosch, 7701 (South Africa)
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  • Dr. Rüdiger Kötz,

    1. Electrochemistry Laboratory, Paul Scherrer Institut, Villigen-PSI, 5232 Villigen (Switzerland)
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  • Prof. Thomas J. Schmidt

    1. Electrochemistry Laboratory, Paul Scherrer Institut, Villigen-PSI, 5232 Villigen (Switzerland)
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Abstract

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Perovskite catalysts: Cyclic voltammograms in Ar- and O2-saturated KOH reveal that the onset for the oxygen reduction reaction (ORR) occurs at potentials below ∼0.77 VRHE. Rotating ring-disk electrode measurements and Koutecky–Levich analysis prove that for Ba0.5Sr0.5Co0.8Fe0.2O3-δ, the ORR does not fully proceed via a four-electron process, leading to the parallel formation of OH and HO2 (see picture).

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