Tuesday publication post! 📖 In this newest study, the #PoseidonAX system was used for operando liquid cell EM to investigate the behavior of sulfur-doped high-entropy perovskite oxides during oxygen electrocatalysis. By combining nanoscale imaging with spectroscopic and theoretical analysis, the authors uncovered how multi-element active sites and oxygen vacancies regulate catalytic pathways for both the oxygen evolution and oxygen reduction reactions (#OER).
Key highlights:
🧪 Sulfur-doped La0.8Sr0.2(CrMnFeCoNi)O3 high-entropy perovskite oxides enable strong bifunctional activity for both OER and ORR
🔬 Operando liquid-cell TEM with the Poseidon AX reveals structural dynamics under electrochemical conditions
⚡ Multi-technique analysis and Density Functional Theory calculations uncover dual reaction pathways: the adsorbate evolution mechanism and the Lattice Oxygen Mechanism (LOM)
📈 Mn, Fe, Co, and Ni act as cooperative active sites for OER, while Mn, Fe, and Co primarily drive ORR activity, with oxygen vacancies promoting lattice oxygen participation
This work highlights how advanced operando nanoscale characterization, including liquid-phase TEM with the Poseidon AX, can reveal the complex catalytic mechanisms in high-entropy materials.
Want to read the entire work? Find it here!
https://www.doi.org/10.1016/j.cej.2025.161731
Want to know more about the Poseidon AX?
https://www.protochips.com/solutions/in-situ-tem-solutions/in-situ-liquid-cell/
