Abstract
This work is focused on La0.6Sr0.4CoO3-δ (LSC) infiltrated La0.58Sr0.4Co0.2Fe0.8O3-δ (LSCF) oxygen electrode for high temperature steam electrolysis aimed at efficient hydrogen production. In this respect, first the chemical and structural stability of both LSCF and LSC materials are investigated as a function of temperature under air and oxygen. The electrochemical performance of LSC infiltrated LSCF oxygen electrode is then investigated for steam electrolysis and compared with conventional LSCF electrode. The symmetrical half-cell as well as single cell containing LSCF oxygen electrode with and without LSC infiltration are characterized using electrochemical impedance spectroscopy in the temperature range 700–900°C. It is observed that the symmetrical cell as well as single cells with LSC infiltrated LSCF electrode performs better than the conventional LSCF electrode. The degradation experiments were performed with the symmetrical cells under polarizations. Post-test analysis using SEM-EDX was performed to investigate the changes of electrode and electrode/electrolyte interface microstructures.
Highlights
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not
During solid oxide cells (SOC) operation, the electrode polarizations induce large voltage losses especially at the oxygen electrode compared to the fuel electrode,[12,13,14,15] the modification in the existing material as well as investigation of new oxygen electrode materials are still required in order to enhance the oxygen electrode reaction kinetics
This work reports the results on the study of LSC infiltrated LSCF oxygen electrode and comparison with conventional screen-printed LSCF oxygen electrode under electrolysis conditions
Summary
The XRD characterization of as-prepared LSCF and LSC phases show that these materials crystalize in a rhombohedral structure with R-3c space group. The full pattern profile matching refinements leads to determine the following lattice parameters a = b = 5.4810(4) Å, c = 13.439(3) Å and a = b = 5.4335(4) Å, c = 13.217(3) Å for LSCF and LSC respectively. These values are in good agreement with the previously reported results.[57,58]. Thermal behavior of the materials with temperature under air and oxygen (XRD vs T).—The thermal variation of the X-ray patterns under air shows that both LSCF and LSC phases remain stable up to 1000◦C; with increasing temperature, the structure always keeps the rhombohedral symmetry and is still indexed with the R-3c space group. The LSC phase formation test was not performed with the infiltrated electrode as the (a)
Sign-in/Register to view highlights & summary 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.
