Premium
High Cationic Dispersity Boosted Oxygen Reduction Reactivity in Multi‐Element Doped Perovskites
Author(s) -
Li Wenhuai,
Li Mengran,
Guo Yanan,
Hu Zhiwei,
Zhou Chuan,
Brand Helen E. A.,
Peterson Vanessa K.,
Pao ChihWen,
Lin HongJi,
Chen ChienTe,
Zhou Wei,
Shao Zongping
Publication year - 2023
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202210496
Subject(s) - materials science , oxygen , doping , perovskite (structure) , oxide , inorganic chemistry , chemical engineering , chemistry , optoelectronics , organic chemistry , engineering , metallurgy
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 Nb 5+ and Ta 5+ 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.