Publication date: 10th April 2024
Solid oxide electrolysis cells (SOECs) represent a cutting-edge technology, enabling efficient and sustainable conversion of electrical energy into chemical fuels, which play a pivotal role in the future of energy conversion and storage solutions [1, 2]. The conventional nickel-yttria-stabilized zirconia (Ni-YSZ) composite has undergone extensive exploration as a cathode material in the context of steam electrolysis [3]. However, within SOEC electrodes, several degradation mechanisms have been identified. These include Ni coarsening and agglomeration in humid SOEC cathode environments and Ni depletion [4, 5]. Perovskite-based Mixed Ionic-Electronic Conductors (MIECs) such as La1-xSrxCr1-yMnyO3-d, LaxSr1-xTiO3-d, and LaFeO3-d, exhibit superb conductivity, resilience to sulfur, and superior catalytic activity and has been demonstrated as good candidates to substitute Ni-cermets [4].
In this research, an A-site cation-deficient La0.21Sr0.26Ca0.48Ti0.95Fe0.05O3-δ (LSCTF5-48) perovskite has been examined as a novel hydrogen electrode for SOEC. The appropriate phase purity, structural property, lattice parameters and morphology of the perovskite were inspected using X-ray diffraction and SEM, respectively. For H2O electrolysis at 1.5 V, a maximum electrolysis current density of 1.55 A cm-2 is obtained at 50% H2/50% H2O and 850 ℃. The corresponding polarization resistance of LSCTF5-48 is 0.16 Ω cm2. This study demonstrates that La0.21Sr0.26Ca0.48Ti0.95Fe0.05O3-δ is a promising hydrogen electrode material of SOECs for H2O electrolysis.
This work was supported by the Estonian Research Council grant PRG551, by the project Increasing the knowledge intensity of Ida-Viru entrepreneurship“ co-funded by the European Union (ÕÜF2), by the Estonian Ministry of Education and Research (TK210), ERDF project Centre of Technologies and Investigations of Nanomaterials (NAMUR+, project number 2014-2020.4.01.16-0123).
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