Cation‐Exchange‐Induced Metal and Alloy Dual‐Exsolution in Perovskite Ferrite Oxides Boosting the Performance of Li‐O2 Battery. (13th September 2021)

• Record Type: Journal Article
• Authors: Cong, Yingge; Geng, Zhibin; Zhu, Qian; Hou, Hongwei; Wu, Xiaofeng; Wang, Xiyang; Huang, Keke; Feng, Shouhua
• Is Part Of: Angewandte Chemie. Volume 133:Number 43(2021)
• Page Start: 23568
• Page End: 23575
• Publication Date: 2021-09-13
• Subjects: exsolution -- Li-O2 battery -- perovskite oxide; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202110116
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: A temperature‐controlled cation‐exchange approach is introduced to achieve a unique dual‐exsolution in perovskite La0.8 Fe0.9 Co0.1 O3−δ where both CoFe alloy and Co metal are simultaneously exsolved from the parent perovskite, forming an alloy and metal co‐decorated perovskite oxide. Mossbauer spectra show that cation exchange of Fe atoms in CoFe alloy and Co cations in the perovskite is the key to the co‐existence of Co metal and CoFe alloy. The obtained composite exhibits an enhanced catalytic activity as Li‐O2 battery cathode catalysts with a specific discharge capacity of 6549.7 mAh g −1 and a cycling performance of 215 cycles without noticeable degradation. Calculations show that the combination of decorated CoFe alloy and Co metal synergistically modulated the discharge reaction pathway that improves the performance of Li‐O2 battery. Abstract : CoFe alloy and Co metal co‐decorated perovskite oxide was obtained through a temperature dependent cation exchange reaction and exhibited superior Li‐O2 battery performance, including higher specific capacity, lower overpotential, and obviously better cycling stability.