Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites.
basic_science · Level V
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- Record sourced from PubMed, PMID 34819509.
- Also identified by DOI 10.1038/s41467-021-26739-1 and PMC identifier 8613209.
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Abstract
To significantly increase the amount of exsolved particles, the complete phase reconstruction from simple perovskite to Ruddlesden-Popper (R-P) perovskite is greatly desirable. However, a comprehensive understanding of key parameters affecting the phase reconstruction to R-P perovskite is still unexplored. Herein, we propose the Gibbs free energy for oxygen vacancy formation in Pr<sub>0.5</sub>(Ba/Sr)<sub>0.5</sub>TO<sub>3-δ</sub> (T = Mn, Fe, Co, and Ni) as the important factor in determining the type of phase reconstruction. Furthermore, using in-situ temperature & environment-controlled X-ray diffraction measurements, we report the phase diagram and optimum 'x' range required for the complete phase reconstruction to R-P perovskite in Pr<sub>0.5</sub>Ba<sub>0.5-x</sub>Sr<sub>x</sub>FeO<sub>3-δ</sub> system. Among the Pr<sub>0.5</sub>Ba<sub>0.5-x</sub>Sr<sub>x</sub>FeO<sub>3-δ</sub>, (Pr<sub>0.5</sub>Ba<sub>0.2</sub>Sr<sub>0.3</sub>)<sub>2</sub>FeO<sub>4+δ</sub> - Fe metal demonstrates the smallest size of exsolved Fe metal particles when the phase reconstruction occurs under reducing condition. The exsolved nano-Fe metal particles exhibit high particle density and are well-distributed on the perovskite surface, showing great catalytic activity in fuel cell and syngas production.