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Triple‐Shelled Manganese–Cobalt Oxide Hollow Dodecahedra with Highly Enhanced Performance for Rechargeable Alkaline Batteries
Author(s) -
Jiao Chuangwei,
Wang Zumin,
Zhao Xiaoxian,
Wang Huan,
Wang Jing,
Yu Ranbo,
Wang Dan
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201811683
Subject(s) - dodecahedron , materials science , calcination , electrochemistry , cobalt , manganese , cobalt oxide , chemical engineering , zeolitic imidazolate framework , oxide , imidazolate , battery (electricity) , alkaline battery , inorganic chemistry , electrolyte , electrode , chemistry , metallurgy , adsorption , metal organic framework , catalysis , crystallography , biochemistry , power (physics) , physics , organic chemistry , quantum mechanics , engineering
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).
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