In recently years, there has been a robust attention in clean and renewable energy sources due to heavy dependence on finite fossil fuels as our major source of energy, causing serious energy and environmental crisis such as emission of CO₂ and NO_x on the world. Hydrogen is attracted as a leading candidate for alternative future fuels because it has the potential to address the environmental and energy security issues associated with fossil hydrocarbon fuels. Solid oxide electrolysis cells (SOECs) are one of the promising technology for the efficient production of H₂ from electricity because electrolysis at elevated temperatures is beneficial for both thermodynamic and kinetic reasons. Recent significant interest in steam electrolysis has been mainly concerned with performance, durability and degradation issues. In conventional SOE used for steam electrolysis, the most commonly used cathode and anode materials for oxide ion-conducting SOECs are Ni-YSZ (yttria-stabilized zirconia) and LSM (strontium-doped lanthanum manganites)-YSZ, respectively. But, these electrode materials suffer from several problems such as an intrinsic redox instability, agglomeration and coarsening of nickel particles for Ni-YSZ and a delamination and insufficient durability of LSM-YSZ during steam electrolysis. In this study, the layered perovskite oxides employed as potential ceramic cathode and anode for SOEC with dense LaGaO₃ based electrolyte, showing a high performance and durability over 600 hours with no degradation in electrolysis mode.