High Cationic Dispersity Boosted Oxygen Reduction Reactivity in Multi-Element Doped Perovskites

Wenhuai Li, Mengran Li, Yanan Guo, Zhiwei Hu, Chuan Zhou, Helen E.A. Brand, Vanessa K. Peterson, Chih Wen Pao, Chien Te Chen, More Authors

Research output: Contribution to journalArticleScientificpeer-review

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Oxygen-ion conducting perovskite oxides are important functional materials for solid oxide fuel cells and oxygen-permeable membranes operating at high temperatures (>500 °C). Co-doped perovskites have recently shown their potential to boost oxygen-related kinetics, but challenges remain in understanding the underlying mechanisms. This study unveils the local cation arrangement as a new key factor controlling oxygen kinetics in perovskite oxides. By single- and co-doping Nb5+ and Ta5+ into SrCoO3-δ, dominant factors affecting oxygen kinetics, such as lattice geometry, cobalt states, and oxygen vacancies, which are confirmed by neutron and synchrotron X-ray diffraction as well as high-temperature X-ray absorption spectroscopy, are controlled. The combined experimental and theoretical study unveils that co-doping likely leads to higher cation dispersion at the B-site compared to single-doping. Consequently, a high-entropy configuration enhances oxygen ion migration in the lattice, translating to improved oxygen reduction activity.

Original languageEnglish
Article number2210496
Number of pages8
JournalAdvanced Functional Materials
Issue number1
Publication statusPublished - 2023

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • configuration entropy
  • local cation arrangement
  • oxygen reduction reaction
  • perovskite oxides
  • solid oxide fuel cell


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