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Journal Article

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

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Hu,  Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Li, W., Li, M., Guo, Y., Hu, Z., Zhou, C., Brand, H. E. A., et al. (2023). High Cationic Dispersity Boosted Oxygen Reduction Reactivity in Multi-Element Doped Perovskites. Advanced Functional Materials, 33(1): 2210496, pp. 1-8. doi:10.1002/adfm.202210496.


Cite as: https://hdl.handle.net/21.11116/0000-000C-38A6-A
Abstract
Oxygen-ion conducting perovskite oxides are important functional materials for solid oxide fuel cells and oxygen-permeable membranes operating at high temperatures (gt;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. © 2022 Wiley-VCH GmbH.