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

6 Citations (Scopus)
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Abstract

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
Volume33
Issue number1
DOIs
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.

Keywords

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

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