@article{Ma2026, 
author = {Yumei Ma and Na Lv and Hao Song and Zhiwei Wang and Chao Ren and Yanyan Xu and Lina Su and Ling Huang},
title = {Improved oxygen kinetics on both cathode and anode of SmBaFe2O5+δ-based solid oxide fuel cells through Ca2+ doping},
year = {2026},
journal = {Nano Research},
keywords = {solid oxide fuel cell, Ca2+ doping, SmBaFe2O5+δ, oxygen kinetics, cathode/anode},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908918},
doi = {10.26599/NR.2026.94908918},
abstract = {Electrode materials with robust stability and outstanding catalytic activity are crucial for practical implementation of solid oxide fuel cells (SOFCs). To avoid the inherent thermal expansion from Co-based analogous, we report a double perovskite, SmBaFe2O5+δ (SBF), where purposive doping of larger Ca2+ (1.34 Å) in the Sm3+ (1.24 Å) site, widens the Fe-O-Fe angle from 162 to 168°, shortens the Fe-O (2) bond from 1.9898 to 1.9675 Å. Consequently, both the oxygen kinetics, i.e., oxygen vacancy (VO) concentration, and electron conductivity are significantly improved, which finally leads to a high peak power density (PPD) of 2.14 and 1.18 W·cm−2 at 800 °C among Fe-based perovskites, for single cell using Sm0.9Ca0.1BaFe2O5+δ (SCBF) as cathode and symmetrical-SOFC (Sym-SOFC) using SCBF as both cathode and anode, respectively. This work provides a fresh angle for the design of Co-free, high-performance, and cost-effective electrode materials for SOFCs.}
}