Publication date: 21st July 2025
The growing demand for energy conversion and storage technologies, particularly reversible Symmetrical Solid Oxide Cells (S-SOCs), has been driven by the need for efficient, low-emission energy solutions in stationary power generation and systems that integrate intermittent renewable energy sources. In S-SOCs, both the cathode and anode are composed of the same material, placing stringent requirements on electrode materials. These materials must exhibit mixed ionic-electronic conductivity, redox stability, and high electrocatalytic activity [1].
In this work, we present catalytically active, redox-stable nanofibrous perovskites decorated with in situ exsolved nanocatalysts as novel, high-performance electrode materials for S-SOCs. Perovskite compounds with the general formula Ln0.9(Ba, Sr)0.9(Fe, Mn)1.8(Co, Ni)0.2O6−δ (where Ln = selected lanthanides) were synthesized via the electrospinning technique, which promotes enhanced gas diffusion and improved electrochemical performance of the electrode layers (see Figure 1a, b). Structural and microstructural characterization, performed using X-ray diffraction, transmission electron microscopy equipped with an energy-dispersive detector and Raman spectroscopy, enabled us to elucidate the influence of morphology and Fe-Co-Ni doping on the reversible in situ exsolution/dissolution process of nanoparticles. A self-assembled S-SOC incorporating the most promising electrode materials demonstrated a power density exceeding 950 mW cm−2 when fuelled with wet hydrogen at 850 °C. Excellent long-term stability confirmed that the combined use of multiple material optimization strategies, including in situ exsolution and the electrospinning technique, effectively meets the stringent requirements for high-performance electrodes in S-SOCs. The stable performance achieved in this study significantly surpasses previously reported power densities for symmetrical cells employing Mn-based electrodes [2–5].
The work is funded by the National Science Centre Poland (NCN) based on the decision number UMO-2021/43/D/ST5/00824.
Jakub Lach acknowledges the financial support of research project supported by the program „Excellence Initiative – Research University” for the AGH University of Krakow.
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