| 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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Bäumer, Christoph
University of Twente
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (30/30 displayed)
- 2024The effect of intrinsic magnetic order on electrochemical water splittingcitations
- 2024In Situ X-ray Absorption Spectroscopy of LaFeO3 and LaFeO3/LaNiO3 Thin Films in the Electrocatalytic Oxygen Evolution Reactioncitations
- 2023Separating the Effects of Band Bending and Covalency in Hybrid Perovskite Oxide Electrocatalyst Bilayers for Water Electrolysis
- 2023Probing the stability of SrIrO3 during active water electrolysis via operando atomic force microscopycitations
- 2023Single-Source Vapor-Deposition of MA1–xFAxPbI3 Perovskite Absorbers for Solar Cellscitations
- 2023A High-Entropy Oxide as High-Activity Electrocatalyst for Water Oxidationcitations
- 2022Atomistic Insights into Activation and Degradation of La0.6Sr0.4CoO3-δElectrocatalysts under Oxygen Evolution Conditionscitations
- 2022Separating the Effects of Band Bending and Covalency in Hybrid Perovskite Oxide Electrocatalyst Bilayers for Water Electrolysiscitations
- 2022A high entropy oxide as high-activity electrocatalyst for water oxidation
- 2022Activity-Stability Relationships in Oxide Electrocatalysts for Water Electrolysiscitations
- 2021In situ spectroscopic ellipsometry as a pathway toward achieving VO2 stoichiometry for amorphous vanadium oxide with magnetron sputteringcitations
- 2021Carbonate formation lowers the electrocatalytic activity of perovskite oxides for water electrolysiscitations
- 2020Antiphase Boundaries Constitute Fast Cation Diffusion Paths in SrTiO3 Memristive Devicescitations
- 2020Photoemission electron microscopy of magneto-ionic effects in La0.7Sr0.3MnO3citations
- 2020SrTiO3 termination controlcitations
- 2019Topotactic Phase Transition Driving Memristive Behaviorcitations
- 2019Electrolysis of Water at Atomically Tailored Epitaxial Cobaltite Surfacescitations
- 2018A Theoretical and Experimental View on the Temperature Dependence of the Electronic Conduction through a Schottky Barrier in a Resistively Switching SrTiO3-Based Memory Cellcitations
- 2018Addressing Multiple Resistive States of Polyoxovanadatescitations
- 2018A Theoretical and Experimental View on the Temperature Dependence of the Electronic Conduction through a Schottky Barrier in a Resistively Switching SrTiO 3 -Based Memory Cellcitations
- 2018Reduction of the forming voltage through tailored oxygen non-stoichiometry in tantalum oxide ReRAM devicescitations
- 2018Charge-transfer in B-site-depleted NdGaO3/SrTiO3 heterostructurescitations
- 2017Molecular Characteristics of a Mixed-Valence Polyoxovanadate {VIV/V18O42} in Solution and at the Liquid-Surface Interfacecitations
- 2015Surface Termination Conversion during SrTiO$_{3}$ Thin Film Growth Revealed by X-ray Photoelectron Spectroscopycitations
- 2015Complex behaviour of vacancy point-defects in SrRuO3 thin filmscitations
- 2015Ferroelectrically driven spatial carrier density modulation in graphenecitations
- 2015The influence of the local oxygen vacancy concentration on the piezoresponse of strontium titanate thin filmscitations
- 2015Surface Termination Conversion during SrTiO3 Thin Film Growth Revealed by X-ray Photoelectron Spectroscopycitations
- 2015Impact of the cation-stoichiometry on the resistive switching and data retention of SrTiO3 thin filmscitations
- 2013Feasibility studies for filament detection in resistively switching SrTiO3 devices by employing grazing incidence small angle X-ray scatteringcitations
Places of action
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document
A high entropy oxide as high-activity electrocatalyst for water oxidation
Abstract
<jats:p>High entropy materials are a new pathway in the development of high-activity (electro )catalysts because of the inherent tunability and coexistence of multiple potential active sites, which may lead to earth-abundant catalyst materials for energy-efficient electrochemical energy storage. In this report, we identify how the multi-cation composition in high entropy perovskite oxides (HEO) contributes to high catalytic activity for the oxygen evolution reaction (OER), i.e. the key kinetically limiting half-reactions in several electrochemical energy conversion technologies, including green hydrogen generation. We compare the activity of the (001) facet of LaCr0.2Mn0.2Fe0.2Co0.2Ni0.2O3-δ with the parent compounds (single B-site in the ABO3 perovskite). While the single B-site perovskites roughly follow the expected volcano-type activity trends, the HEO clearly outperforms all of its parent compounds with 2.8 to 100 times higher currents at fixed overpotential. As all samples were grown as an epitaxial layer, our results indicate an intrinsic composition–function relationships, avoiding the effects of complex geometries or unknown surface composition. In-depth X-ray photoemission studies reveal a synergistic effect of simultaneous oxidation and reduction of different transition metal cations during adsorption of reaction intermediates. The surprisingly high OER activity demonstrates that HEOs are a highly attractive, earth-abundant new material class for high-activity OER electrocatalysts, possibly allowing fine-tuning the activity beyond the scaling limits of mono- or bimetallic oxides.</jats:p>