Conference paper · Journal article
Ba0.5Gd0.8La0.7Co2O6−δ infiltrated BaZr0.8Y0.2O3-δ composite oxygen electrodes for protonic ceramic electrolysis cells
Department of Energy Conversion and Storage, Technical University of Denmark1
Solid State Chemistry, Department of Energy Conversion and Storage, Technical University of Denmark2
Colorado School of Mines3
Chinese Academy of Sciences4
Continuum Modelling and Testing, Department of Energy Conversion and Storage, Technical University of Denmark5
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.
| Language: | English |
|---|---|
| Year: | 2021 |
| Pages: | 3-16 |
| Proceedings: | 239th ECS Meeting with the 18th International Meeting on Chemical Sensors |
| ISSN: | 19386737 and 19385862 |
| Types: | Conference paper and Journal article |
| DOI: | 10.1149/10205.0003ecst |
| ORCIDs: | Wang, Q. J. , Hendriksen, P. V. and Chen, M. |
