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Designing bifunctional perovskite catalysts for the oxygen reduction and evolution reactions

Casey E. Beall1, Emiliana Fabbri1*, Adam H. Clark1, Vivian Meier1,2, Nur Sena Yüzbasi3, Thomas Graule3, Sayaka Takahashi4, Yuto Shirase4, Makoto Uchida4, Thomas J. Schmidt1,2

1 Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland

2 Institute for Physical Molecular Science, ETH Zürich, 8093 Zürich, Switzerland

3 Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland

4 Hydrogen and Fuel Cell Nanomaterials Center, University of Yamanashi, 400-0021, Kofu, Japan

* Corresponding authors emails: emiliana.fabbri@psi.ch
DOI10.24435/materialscloud:q7-74 [version v1]

Publication date: Jun 21, 2024

How to cite this record

Casey E. Beall, Emiliana Fabbri, Adam H. Clark, Vivian Meier, Nur Sena Yüzbasi, Thomas Graule, Sayaka Takahashi, Yuto Shirase, Makoto Uchida, Thomas J. Schmidt, Designing bifunctional perovskite catalysts for the oxygen reduction and evolution reactions, Materials Cloud Archive 2024.93 (2024), https://doi.org/10.24435/materialscloud:q7-74


The development of unified regenerative fuel cells (URFC) necessitates an active and stable bifunctional oxygen electrocatalyst. The unique challenge of possessing high activity for both the oxygen reduction (ORR) and oxygen evolution (OER) reactions, while maintaining stability over a wide potential window impedes the design of bifunctional oxygen electrocatalysts. Herein, two design strategies are explored to optimize their performance. The first incorporates active sites for ORR and OER, Mn and Co, into a single perovskite structure, which is achieved with the perovskites Ba0.5Sr0.5Co0.8Mn0.2O3-δ (BSCM) and La0.5Ba0.25Sr0.25Co0.5Mn0.5O3-δ (LBSCM). The second combines an active ORR perovskite catalyst (La0.4Sr0.6MnO3-δ (LSM)) with an OER active perovskite catalyst (Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF)) in a physical mixed composite (BSCF/LSM). The success of the two strategies is investigated by measuring the catalysts’ catalytic performance and response to alternating reducing and oxidizing potentials to mimic the dynamic conditions experienced during operation of URFCs. Additionally, the continuous, potentiodynamic change in Mn, Co, and Fe oxidation state during ORR and OER is elucidated with operando X-ray absorption spectroscopy (XAS) measurements, revealing key insights into the nature of the active sites. The results reveal important catalyst physiochemical properties and provide a guide for future research and design principles for bifunctional oxygen electrocatalysts.

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ORR OER perovskite

Version history:

2024.93 (version v1) [This version] Jun 21, 2024 DOI10.24435/materialscloud:q7-74