Triple‐Shelled Manganese–Cobalt Oxide Hollow Dodecahedra with Highly Enhanced Performance for Rechargeable Alkaline Batteries. Issue 4 (4th December 2018)

• Record Type: Journal Article
• Authors: Jiao, Chuangwei; Wang, Zumin; Zhao, Xiaoxian; Wang, Huan; Wang, Jing; Yu, Ranbo; Wang, Dan
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 4(2019)
• Page Start: 996
• Page End: 1001
• Publication Date: 2018-12-04
• Subjects: rechargeable alkaline batteries -- manganese-cobalt oxide -- multi-shelled structures -- zeolitic imidazolate frameworks (ZIFs); Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201811683
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Precisely carving of multi‐shelled manganese–cobalt oxide hollow dodecahedra (Co/Mn‐HD) with shell number up to three is achieved by a controlled calcination of the Mn‐doped zeolitic imidazolate framework ZIF‐67 precursor (Co/Mn‐ZIF). The unique multi‐shelled and polycrystalline structure not only provides a very large electrochemically active surface area (EASA), but also enhances the structural stability of the material. The residual C and N in the final structures might aid stability and increase their conductivity. When used in alkaline rechargeable battery, the triple‐shelled Co/Mn‐HD exhibits high electrochemical performance, reversible capacity (331.94 mAh g −1 at 1 Ag −1 ), rate performance (88 % of the capacity can be retained with a 20‐fold increase in current density), and cycling stability (96 % retention over 2000 cycles). Abstract : Me, my shell, and I : A controlled continuous two‐step calcination of the Mn‐doped zeolitic imidazolate framework ZIF‐67 precursor (Co/Mn‐ZIF) gives triple‐shelled manganese–cobalt oxide hollow dodecahedra (Co/Mn‐HD). Co/Mn‐HD has promising electrochemical performance for rechargeable alkaline batteries.