| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Fabbri, Emiliana
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Designing bifunctional perovskite catalysts for the oxygen reduction and evolution reactionscitations
- 2024Cobalt-free layered perovskites RBaCuFeO 5+ δ (R = 4f lanthanide) as electrocatalysts for the oxygen evolution reactioncitations
- 2023Operando Investigations of Reversible and Irreversible Transformations of Metal Organic Framework Based Catalysts during the Oxygen Evolution Reaction
- 2023Influence of carbon on the dynamic changes in <scp>C</scp>o oxidation state of Ba0.<scp>5Sr0</scp>.<scp>5Co0</scp>.<scp>8Fe0</scp>.<scp>2O3</scp>‐δ perovskite catalyst during the oxygen reduction and evolution reactionscitations
- 2023Influence of carbon on the dynamic changes in Co oxidation state of Ba0.5Sr0.5Co0.8Fe0.2O3-δ perovskite catalyst during the oxygen reduction and evolution reactionscitations
- 2022Investigating Perovskite Oxide Catalysts As Bifunctional Oxygen Electrodes Using Operando XAS
- 2021Correlation between Oxygen Vacancies and Oxygen Evolution Reaction Activity for a Model Electrode: PrBaCo2O5+δ
- 2021Correlation between Oxygen Vacancies and Oxygen Evolution Reaction Activity for a Model Electrode: PrBaCo<sub>2</sub>O<sub>5+<i>δ</i></sub>citations
- 2020Tuning the Co oxidation state in Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ by flame spray synthesis towards high oxygen evolution reaction activitycitations
- 2019Fe-doping in double perovskite PrBaCo 2(1-x) Fe 2x O 6-δ : insights into structural and electronic efects to enhance oxygen evolution catalyst stabilitycitations
- 2019Fe-Doping in Double Perovskite PrBaCo2(1-x)Fe2xO6-δ: Insights into Structural and Electronic Effects to Enhance Oxygen Evolution Catalyst Stabilitycitations
- 2018Highly Active Nanoperovskite Catalysts for Oxygen Evolution Reaction: Insights into Activity and Stability of Ba0.5Sr0.5Co0.8Fe0.2O2+δ and PrBaCo2O5+δcitations
- 2017Unraveling thermodynamics, stability, and oxygen evolution activity of strontium ruthenium perovskite oxidecitations
- 2017Dynamic surface self-reconstruction is the key of highly active perovskite nano-electrocatalysts for water splittingcitations
- 2015Probing the bulk ionic conductivity by thin film hetero-epitaxial engineeringcitations
- 2014Catalyzed SnO2 thin films: theoretical and experimental insights into fabrication and electrocatalytic propertiescitations
Places of action
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article
Investigating Perovskite Oxide Catalysts As Bifunctional Oxygen Electrodes Using Operando XAS
Abstract
With the increase in renewable energy usage comes the need for energy storage systems due to intermittency issues. Hydrogen storage systems have been identified as one solution. Unitized regenerative fuel cells (URFC) combine electrolyzers and fuel cells in one device, allowing electricity to be stored and used easily. However, the oxygen electrodes are still affected by high overpotentials and slow kinetics. Perovskite oxides have been identified as a class of materials, which are low-cost, tunable, and active for the oxygen reduction (ORR) and evolution (OER) reactions. Here, we investigate perovskites as bifunctional catalysts for ORR and OER in alkaline solution. We examine and compare two strategies for bifunctional catalysts: using one catalyst, which is able to perform OER and ORR vs. a combination of two catalysts, one active for ORR and one active for OER. Frequently, the catalysts’ performances for these two reactions are measured separately.<jats:sup>1,2,3</jats:sup> Here, we investigate how these bifunctional catalysts respond to cycling between the OER and ORR regions.</jats:p><jats:p>Ba<jats:sub>0.5</jats:sub>Sr<jats:sub>0.5</jats:sub>Co<jats:sub>0.8</jats:sub>Fe<jats:sub>0.2</jats:sub>O<jats:sub>3</jats:sub> (BSCF) is known to be a promising OER catalyst.<jats:sup>4,5,6</jats:sup> However, without carbon, it lacks ORR activity.<jats:sup>4</jats:sup> La<jats:sub>(1-x)</jats:sub>Sr<jats:sub>x</jats:sub>MnO<jats:sub>3</jats:sub> (LSM) is a promising ORR catalyst.<jats:sup>3,7</jats:sup> However, without modification, it has been shown to have limited OER activity.<jats:sup>3</jats:sup> Separately, these catalysts lack high performance for both reactions. Here, we combine the two catalysts into a BSCF/LSM/Carbon composite electrode and compare to electrodes prepared from the constituent single material components. In addition, we have synthesized single material perovskites containing both Co and Mn that to the best of our knowledge have never been tested as electrodes for ORR/OER. In order to understand the catalysts’ behaviors under OER and ORR conditions, X-ray adsorption spectroscopy (XAS) was measured continuously while performing cyclic voltammetry. We were able to monitor the continuous changes of the Co, Mn, and Fe oxidation states and local environment during OER and ORR with remarkably high time/applied potential resolution. Our findings illustrate the reversible and irreversible changes that can occur during OER and ORR and provide strategies for future bifunctional catalyst design.