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

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

Li, Wenhuai (Nanjing Tech University)
Li, Mengran (TU Delft ChemE/Materials for Energy Conversion and Storage)
Guo, Y. (Nanjing Tech University)
Hu, Zhiwei (Max Planck Institute for Chemical Physics of Solids)
Zhou, Chuan (Nanjing Tech University)
Brand, Helen E.A. (Australian Nuclear Science and Technology Organisation)
Peterson, Vanessa K. (Australian Nuclear Science and Technology Organisation)
Pao, Chih Wen (Australian Nuclear Science and Technology Organisation)
Chen, Chien Te (National Synchrotron Radiation Research Center, Hsinchu)

2023

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 SrCoO_3-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.

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

http://resolver.tudelft.nl/uuid:ae0bd627-4a17-4395-9f0b-0c8428533e3a

https://doi.org/10.1002/adfm.202210496

2023-07-01

1616-301X

Advanced Functional Materials, 33 (1)

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.

Institutional Repository

journal article

© 2023 Wenhuai Li, Mengran Li, Y. Guo, Zhiwei Hu, Chuan Zhou, Helen E.A. Brand, Vanessa K. Peterson, Chih Wen Pao, Chien Te Chen, More Authors