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Significant Zirconium Substitution Effect on the Oxygen Reduction Activity of the Cathode Material NdBaCo₂O₅₊δ for Solid Oxide Fuel Cells

Author:
Sun, Chengzhi, Kong, Yu, Shao, Lin, Zhang, Qi, Wu, Xian, Zhang, Naiqing, Sun, Kening
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.13 pp. 11603-11611
ISSN:
2168-0485
Subject:
cathodes, cations, diffusivity, electrical properties, electrochemistry, fuel cells, oxygen, zirconium
Abstract:
NdBaCo₂O₅₊δ (NBCO) based double perovskite is an attractive cathode material with many advantages, yet its electrochemical performance still cannot meet the requirements. We first design and prepare Zr cation doping NdBaCo₁.₉₅Zr₀.₀₅O₅₊δ and systematically study the effects of Zr-doping on the oxygen kinetics, redox, and electrical properties of NdBaCo₁.₉₅Zr₀.₀₅O₅₊δ as cathode material for oxygen conduction SOFCs. NdBaCo₁.₉₅Zr₀.₀₅O₅₊δ show rapid oxygen bulk diffusion coefficients and surface exchange coefficients through zirconium cations doping, reaching 5.827 × 10–⁵ cm²·s–¹ and 2.878 × 10–⁴ cm·s–¹, respectively, at 700 °C, enabling the improved performance of oxygen reduction, and the polarization impedance is as low as 0.024 Ω·cm².
Agid:
6485616