Abstract
Nanoscale perovskite oxides with enhanced electrocatalytic activities have been widely used as oxygen electrodes of reversible solid oxide cells (RSOC). Here, La0.6Sr0.4FeO3−δ (LSF) nanoscale powder is synthesized via a novel molten salt method using chlorides as the reaction medium and fired at 850 °C for 5 h after removing the additives. A direct assembly method is employed to fabricate the LSF electrode without a pre-sintering process at high temperature. The microstructure characterization ensures that the direct assembly process will not damage the porosity of LSF. When operating as a solid oxide fuel cell (SOFC), the LSF cell exhibits a peak power density of 1.36, 1.07 and 0.7 W/cm2 at 800, 750 and 700 °C, respectively, while in solid oxide electrolysis cell (SOEC) mode, the electrolysis current density reaches 1.52, 0.98 and 0.53 A/cm2 under an electrolysis voltage of 1.3 V, respectively. Thus, it indicates that the molten salt routine is a promising method for the synthesis of highly active perovskite LSF powders for directly assembled oxygen electrodes of RSOC.
Highlights
Reversible solid oxide cells (RSOC) are a novel energy conversion and storage device with the highest efficiency [1]
The phase purity of the as-synthesized LSF powders was characterized by room temperature
The EDS spectrum (Figure 2d) of the powders confirms that all the additive chloride salts have been removed, and the overall X-ray photoelectron spectrometry (XPS) spectrum (Figure 2e) reveals the presence of elements of La, Sr, Fe and O
Summary
Reversible solid oxide cells (RSOC) are a novel energy conversion and storage device with the highest efficiency [1]. As a mixed electronic and ionic conductor (MIEC), (La,Sr)FeO3−δ (LSF) has been extensively studied to replace the conventional manganite based materials and exhibit much higher electrochemical performance at intermediate temperature (600–800 ◦ C) [5,6]. The infiltrated cell exhibits a peak power density of 611 mW/cm using humidified H2 at 800 ◦ C [8]. Another effective technology to fabricate perovskite electrocatalysts is the molten salt synthesis (MSS) method. Guan et al employed the MSS method to synthesize Nb-doped LSF electrode for RSOC, achieving a peak power density of
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