Ba0.5Gd0.8La0.7Co2O6-δ Infiltrated BaZr0.8Y0.2O3-δ Composite Oxygen Electrodes for Protonic Ceramic Cells

Qingjie Wang, Sandrine Ricote, Yu Wang, Peter Vang Hendriksen, Jianqiang Wang, Ming Chen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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In this study, a composite oxygen electrode is prepared by infiltrating a protonic-electronic conducting material, Ba0.5Gd0.8La0.7Co2O6-δ (BGLC) into a proton-conducting BaZr0.8Y0.2O3-δ (BZY20) backbone. The composite oxygen electrode is studied in a symmetrical cell configuration (BGLC-BZY20//BZY20//BGLC-BZY20). The electrode and cell performance are characterized via electrochemical impedance spectroscopy (EIS) with varying the operating conditions, including temperatures, oxygen, and steam partial pressures, with the purpose to identify and characterize the different electrochemical processes taking place in the oxygen electrode. Three electrode reaction processes are observed in the impedance spectra, which are tentatively assigned to i) diffusion of adsorbed oxygen/proton migration/hydroxyl formation, ii) oxygen reduction, and iii) charge transfer, going from the low- to high-frequency range. The BGLC-BZY20 electrode developed in this work shows a low polarization resistance of 0.22, 0.58, and 1.43 Ω cm2 per single electrode in 3% humidified synthetic air (21% O2/79% N2) at 600 °C, 550 °C, and 500 °C, respectively. During long-term measurement, the cell shows no degradation in the first 350 h but degrades afterward possibly due to insufficient material stability.
Original languageEnglish
Article number014513
JournalJournal of the Electrochemical Society
Issue number1
Number of pages9
Publication statusPublished - 2022


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