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

Waidha, Aamir Iqbal and Ni, Lingmei and Ali, Jasim and Lepple, Maren and Donzelli, Manuel and Dasgupta, Supratik and Wollstadt, Stephan and Alff, Lambert and Kramm, U. I. and Clemens, Oliver (2020):
Synthesis of bifunctional BaFe1−xCoxO3−y−δ(OH)y catalysts for the oxygen reduction reaction and oxygen evolution reaction.
In: Journal of Materials Chemistry A, (2), 8. Royal Society of Chemistry, pp. 616-625, ISSN 2050-7488,
DOI: 10.1039/C9TA10222A,
[Online-Edition: https://doi.org/10.1039/C9TA10222A],
[Article]

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 of 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 0.1 M 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.

Item Type: Article
Erschienen: 2020
Creators: Waidha, Aamir Iqbal and Ni, Lingmei and Ali, Jasim and Lepple, Maren and Donzelli, Manuel and Dasgupta, Supratik and Wollstadt, Stephan and Alff, Lambert and Kramm, U. I. and Clemens, Oliver
Title: Synthesis of bifunctional BaFe1−xCoxO3−y−δ(OH)y catalysts for the oxygen reduction reaction and oxygen evolution reaction
Language: English
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 of 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 0.1 M 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.

Journal or Publication Title: Journal of Materials Chemistry A
Journal volume: 8
Number: 2
Publisher: Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Catalysts and Electrocatalysts
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Anorganische Chemie
07 Department of Chemistry > Physical Chemistry
Date Deposited: 04 Jun 2020 09:29
DOI: 10.1039/C9TA10222A
Official URL: https://doi.org/10.1039/C9TA10222A
Projects: O. Clemens acknowledges support by the German Research Foundation within the Emmy Noether Programme (grant no. CL551/2-1).
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