Ba0.5Gd0.8La0.7Co2O6−δ infiltrated BaZr0.8Y0.2O3-δ composite oxygen electrodes for protonic ceramic electrolysis cells

Q. J. Wang, S. Ricote, P. V. Hendriksen, Y. Wang, J. Q. Wang, M. Chen

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Abstract

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 symmetric cell configuration (BGLCBZY20//BZY20//BGLC-BZY20). The electrochemical performance is characterized by varying the operating conditions, including temperature, oxygen, and steam partial pressures, with the purpose to identify and characterize the different electrochemical processes taking place in the oxygen electrode. Two electrode reaction processes are observed in the impedance spectra: one in the middle-frequency range (400 ~ 50 kHz) tentatively ascribed to the process of proton transfer from the electrode to the electrolyte, and the other in the low-frequency range (0.1 ~ 1 Hz) related to diffusion of O species. The BGLCBZY20 electrode developed in this work shows a low polarization resistance of 0.44, 1.17, and 2.87 Ω cm2 in 3 % humidified synthetic air (21% O2/79% N2) at 600, 550, and 500 °C, respectively.
Original languageEnglish
JournalECS Transactions
Volume102
Issue number5
Pages (from-to)3-16
Number of pages14
ISSN1938-5862
DOIs
Publication statusPublished - 2021
Event239th ECS Meeting with the 18th International Meeting on Chemical Sensors - Chicago, United States
Duration: 30 May 20213 Jun 2021
Conference number: 239

Conference

Conference239th ECS Meeting with the 18th International Meeting on Chemical Sensors
Number239
Country/TerritoryUnited States
CityChicago
Period30/05/202103/06/2021

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