A high-performance oxygen electrode for solid oxide cells: Compositional optimisation of barium cobaltite-based composites

Araujo A.J.M. ¹Paskocimas C.A. ¹Loureiro F.J.A. ²Fagg D.P. ²Grilo J.P.F. ³Macedo D.A.⁴

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作者信息

1. Materials Science and Engineering Postgraduate Program – PPGCEM Federal University of Rio Grande do Norte – UFRN
2. Centre for Mechanical Technology and Automation – TEMA Mechanical Engineering Department University of Aveiro
3. Department of Materials and Ceramic Engineering CICECO – Aveiro Institute of Materials University of Aveiro
4. Materials Science and Engineering Postgraduate Program – PPCEM Federal University of Paraíba – UFPB
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Abstract

? 2022 Elsevier B.V.Solid oxide electrochemical cells are promising devices for energy conversion and chemical synthesis. In this respect, one of the main challenges to improving cell performance is the decrease in the polarisation resistance (Rp) of the oxygen electrodes. Here, the electrochemical properties of composite electrodes of Ba2Co9O14/Ce0.8Gd0.2O2-δ (BCO/CGO) are investigated by electrochemical impedance spectroscopy at 600–800 °C. The composite with 50 vol% CGO exhibits the lowest polarisation resistance, 0.3 Ω cm2 at 600 °C in O2. The comparatively superior performance results from an increased triple-phase boundary (TPB) length due to the increased percolation of both phases. This successful result presents a high-performing oxygen electrode for solid oxide electrochemical systems.

Key words

Barium cobaltite (Ba2Co9O14 – BCO)/Electrochemical Impedance Spectroscopy (EIS)/Gadolinium-doped ceria (CGO)/Solid Oxide Cell (SOC)

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出版年

2022

Journal of Alloys and Compounds

EISCI

ISSN：0925-8388

被引量5

参考文献量58

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