Publication date: 10th April 2024
The global demand for sustainable and reliable energy sources has led to increased interest in technologies such as solid oxide electrochemical cells (SOECs), which reversibly generate electricity and hydrogen through chemical reactions. However, SOECs require high operating temperatures, posing material and cost challenges. Protonic ceramic electrochemical cells (PCECs), on the other hand, utilize protons as charge carriers and operate at lower temperatures (below 600°C) with higher efficiency due to their low activation energy. So far, triple ionic-and-electronic conductors (TIECs) have been extensively investigated for PCECs, introducing, and enhancing proton conductivity to the oxygen electrode, providing a larger space of active reaction sites for electrochemical reactions in the cell; however, challenges such as A-site cation segregation or inadequate chemical compatibility found in highly active Co-based materials still need to be addressed for practical application. Recently, high-entropy materials have attracted attention to address these issues, exhibiting thermodynamically stable properties at high temperatures results from their high configurational entropy of the material. Here, we present recent progress in the development of high-entropy double perovskite oxide (HEDPO) oxygen electrodes for PCECs, incorporating high configurational entropy in the A-site of the structure to achieve superior material compatibility and stability while maintaining excellent electrocatalytic activity. This work paves the way towards robust and innovative oxygen electrodes for PCEC applications, contributing to the advancement of sustainable energy solutions.
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