Reversible, all-perovskite SOFCs based on La, Sr gallates

Abstract

In this contribution, a reversible Solid Oxide Cell based on perovskites was developed. La0.6Sr0.4Ga0.3Fe0.7O3 (LSGF) was chosen as electrode and deposited onto La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte. The cell was investigated from the morphological (SEM) and compatibility (XRD) point of view. Electrochemical investigation confirmed that the cell can operate in fuel cell and in electrolyser modes. Impregnation with CGO and Pd allowed a 15 times increment of the power density (until limit is the cell architecture). The same cell with an impregnated negative electrode was then tested in steam electrolysis mode in a non-reducing environment. The overall performance is slightly lower than state-of-the-art materials and comparable with similar perovskites, and in general is fair considering the needed cell optimisation (i.e a anode supported configuration is necessary). The cell (impregnated and not) activates at 0.7 V. Obtained data suggest thus LSGF/LSGM/LSGF cell, is promising as reversible SOC for intermediate temperature.

Recent Progress in the Design, Characterisation and Application of LaAlO3- and LaGaO3-Based Solid Oxide Fuel Cell Electrolytes

“…The electrochemical investigations in [211][212][213][214][215] for LSGM-based SOFCs confirm that these cells can operate in both fuel cell and electrolysis cell modes. Reversible cells were fabricated in [215] with NiO-YSZ-substrate as an anode, La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3−δ film as an electrolyte and Sm 0.5 Sr 0.5 CoO 3−δ as an air electrode.…”

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

“…405 An enhanced activity of LSCM was also accomplished by doping Sc 412 and loading Ni nanoparticles by impregnation. 415 Moreover, perovskite materials, such as LSTO 406 and La 0.6 Sr 0.4 Ga 0.3 Fe 0.7 O 3 (LSGF), 416 have been developed as hydrogen electrode materials owing to their excellent redox stabilities and moderate performance.…”

Rational Development of IT-SOFC Electrodes Based on the Nanofunctionalization of La0.6Sr0.4Ga0.3Fe0.7O3 with Oxides. Part 2: Anodes by Means of Manganite Oxide

“…A commercial cathode was used to make its contribution negligible. Then, we demonstrate that La, Sr, and Ga-based perovskite can be used in all components of SOCs because of its stability under both working conditions . Indeed, button cells were prepared by depositing the above nanocomposites (electrodes) on the LSGM (La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 ) electrolyte.…”

“…Then, we demonstrate that La, Sr, and Ga-based perovskite can be used in all components of SOCs because of its stability under both working conditions. 43 Indeed, button cells were prepared by depositing the above nanocomposites (electrodes) on the LSGM (La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 ) electrolyte. LSGM being a perovskite with a composition very similar to LSGF, we expect a very good ionic conductivity while keeping electronic and hole conduction negligible.…”