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DRT enabled mechanistic insight into the electrochemical process in the B-site-tailored SrCoO3-δ cathode for low-temperature solid oxide fuel cells
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DOI：10.1016/j.jelechem.2026.120218.png)
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Abstract
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• Ta5+/Nb5+ ionic size matching isolates electronegativity as the ORR kinetic descriptor in SC. • Lower Ta5+ electronegativity reduces vacancy formation energy and migration barriers. • TGA, XPS, and EIS confirm the defect-activity ordering: SCST > SCT20 > SCSN > SCN20. • DRT shows Nb systems are diffusion-limited; SCST achieves balanced P2-P3 at ≥500 °C. • B-site electronegativity shifts the ORR bottleneck without altering lattice geometry.
Keywords:
ORR kinetics
electronegativity
defect formation
diffusion limitation
B-site tailoring
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4.1
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1.7W
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4.0W
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