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

Journal article (2023)

Authors

Wenhuai Li Nanjing Tech University
Mengran Li ChemE/Materials for Energy Conversion and Storage - AS
Y. Guo Nanjing Tech University
Zhiwei Hu Max Planck Institute for Chemical Physics of Solids
Chuan Zhou Nanjing Tech University
Helen E.A. Brand Australian Nuclear Science and Technology Organisation
Vanessa K. Peterson Australian Nuclear Science and Technology Organisation
Chih Wen Pao Australian Nuclear Science and Technology Organisation
Chien Te Chen National Synchrotron Radiation Research Center, Hsinchu
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Research Group
ChemE/Materials for Energy Conversion and Storage (AS) (TU Delft)
Copyright: © 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
DOI
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https://doi.org/10.1002/adfm.202210496
Solid oxide fuel cell Oxygen reduction reaction Perovskite oxides Configuration entropy Local cation arrangement
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Published Date

2023

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Materials for Energy Conversion and Storage

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.