High Cationic Dispersity Boosted Oxygen Reduction Reactivity in Multi‐Element Doped Perovskites
Source abstract
Abstract
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.
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Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Materials‐Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Nanjing 210009 P. R. China
Materials for Energy Conversion and Storage (MECS) Department of Chemical Engineering Faculty of Applied Sciences Delft University of Technology van der Maasweg 9 2629 HZ Delft The Netherlands
Max‐Planck‐Institute for Chemical Physics of Solids Nöthnitzer Str. 40 01187 Dresden Germany
Australian Synchrotron Australian Nuclear Science and Technology Organisation (ANSTO) Clayton Victoria 3168 Australia
Australian Centre for Neutron Scattering Australian Nuclear Science and Technology Organisation Sydney New South Wales Australia
National Synchrotron Radiation Research Center 101 Hsin‐Ann Road Hsinchu 30076 Taiwan
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