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 (BGLC-BZY20//BZY20//BGLC-BZY20). The electrochemical performance is characterized by systematically 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 tentatively ascribed to the process of proton transfer from the electrode to the electrolyte, and the other in the low-frequency range corresponding to diffusion of O− species. The BGLC-BZY20 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 ℃, respectively.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
