Publication date: 10th April 2024
Proton Ceramic Cells (PCCs) hold promise for establishing consistent and enduring power systems. However, their efficiency is impeded by the sluggish reaction kinetics of the air electrode at low temperatures (<500°C), a significant challenge hindering their commercial viability. Previous reports highlighted that the sluggish gas adsorption and dissociation step contribute to the most performance loss when the temperature is below 500 oC. 1,2 In this work, we innovatively propose a method to enhance PCC’s performance by in-situ extracting inert A-site cations from the material’s lattice, enabling the PCC to work down to 350 oC. Our method employs high-performance PaBaCo2O5+d as the initial material and cerium as the medium. We modulate cation defects at the A-site by tailoring the quantity of cerium while simultaneously generating nanoparticles on the surface. This dual process promotes the gas adsorption/dissociation process. By employing this modified material as the air electrode, we achieved an impressive power density of 400 mW cm-2 at 450°C. This methodology offers a uniform approach that can be implemented in various air-electrode applications, thus facilitating the broader adoption of PCC technology at lower temperatures.
This work was financially supported by the Horizon Europe Program HORIZON TMA MSCA PF EF (Project no. 101064064).
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