Hollow Octahedral Pr<sub>6</sub>O<sub>11</sub>‐Mn<sub>2</sub>O<sub>3</sub> Heterostructures for High‐Performance Aqueous Zn‐Ion Batteries
Qiang Liu, Guilan Fan, Yinxiang Zeng, Xiaotao Zhang, Deyan Luan, Yan Guo, Xiaojun Gu, Xiong Wen Lou
Abstract
Abstract Mn‐based oxides are broadly prospected cathode materials for aqueous Zn‐ion batteries (AZIBs) due to their rich abundance, low cost, and plentiful valence states. However, the further development of Mn‐based oxides is severely restricted by the dissolution of active materials and poor structural stability. Herein, hollow octahedral Pr 6 O 11 ‐Mn 2 O 3 (denoted as PrO‐MnO) heterostructures are developed through a facile metal–organic framework‐engaged templating approach, which realizes boosted Zn ion storage performance. Pr 6 O 11 can not only effectively suppress the dissolution of Mn to stabilize Mn 2 O 3 but also induce interfacial charge rearrangement and promote electron/ion transfer, contributing to the improved electrochemical activity and stability of PrO‐MnO. Moreover, the rationally designed hollow nanostructure offers sufficient active sites and facilitates the reaction kinetics. As expected, the PrO‐MnO cathode exhibits excellent rate and cycling performance with a high reversible capacity of 140.8 mAh g −1 after 2000 cycles at 1 A g −1 , outperforming the Mn 2 O 3 cathode.