Publication date: 10th April 2024
This presentation explores new cobalt-free air electrodes for protonic ceramic cells, focusing on Fe-containing perovskites oxides. We first introduce a Sr0.9Ce0.1Fe0.8Ni0.2O3-δ (SCFN) perovskite-based nanocomposite for air electrodes and Ni-Fe alloy support for fuel electrodes, improving RePCCs' performance [2]. The SCFN nanocomposite, exhibiting electrocatalytic surfaces enriched with CeO2 and NiO nanoparticles, enables superior oxygen exchange and transfer. The produced RePCCs demonstrate excellent power density and stability.
In the second part of the talk [2], we analyze the challenges protonic ceramic fuel cells encounter. In particular, the cobalt-free perovskite, Ba0.875 Fe0.875Zr0.125O3−δ, is developed using ab initio simulations by showing that hydration and oxidation need to be facilitated while ensuring stability. While the former properties are enhanced by Ba-site deficiency, Zr substitution enhances stability. The prepared cell demonstrates superior electrochemical activity, achieving a peak power density of 0.67 W cm−2 at 500 °C. This work presents promising, efficient, and durable strategies for protonic ceramic cells.
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