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Synthesis of bifunctional BaFe1-xCoxO3-y-δ(OH)y catalysts for the oxygen reduction reaction and oxygen evolution reaction

Abstract

Perovskite oxides with mixed ionic and electronic conductivities are very promising candidates for their application as energy materials related to fuel cell and metal air battery integration. In this article, we report on the systematic characterization of mixed proton and electron conducting compounds of composition BaFe1 xCoxO3 y δ(OH)y synthesized via nebulized spray pyrolysis. Independent on the value of x, all samples BaFe1 xCoxO3 y δ(OH)y were found to crystallize in an orthorhombic ordering/distortion variant of the perovskite type structure (space group Cmcm) and are isotypic to the border phases (x = 0 or 1) reported previously. A minimum water content was observed for the composition with x = 0.5, which increases steadily for Co or Fe richer compositions. Impedance studies show that the conductivity increases with increasing Co-content, with BaCo0.5Fe0.5O2.07(OH)0.74 showing a total electrical conductivity of 10-7 S cm-1 at 298 K, an order of magnitude higher than found for BaFeO2.33(OH)0.33. Further, bifunctional catalytic activity for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) was found for the compounds of the series as investigated in 0.1M KOH, with BaFe0.8Co0.2O3 y δ(OH)y possessing the best bifunctional performance parameter of ΔU =1.10 V, which is comparable to that of other non-precious metal catalysts

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Publication details

The article was received on 16 Sep 2019, accepted on 29 Nov 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9TA10222A
J. Mater. Chem. A, 2019, Accepted Manuscript

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    Synthesis of bifunctional BaFe1-xCoxO3-y-δ(OH)y catalysts for the oxygen reduction reaction and oxygen evolution reaction

    A. I. Waidha, L. Ni, J. Ali, M. Lepple, M. Donzelli, S. Dasgupta, S. Wollstadt, A. Lambert, U. I. Kramm and O. Clemens, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA10222A

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