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Interior Supported Hierarchical TiO 2 @Co 3 O 4 Derived from MOF‐on‐MOF Architecture with Enhanced Electrochemical Properties for Lithium Storage
Author(s) -
Yang Xu,
Wang Yu,
Hu Yongyuan,
Zhao Hongsheng,
Sun Yingying,
Hua Ke,
Chen Gang
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900915
Subject(s) - electrochemistry , materials science , lithium (medication) , annealing (glass) , metal organic framework , chemical engineering , electrode , nanotechnology , diffusion , adsorption , chemistry , composite material , thermodynamics , medicine , engineering , endocrinology , physics
Metal‐organic frameworks (MOFs)‐derived materials are widely applied in functional materials with noble structures. Here, a well‐designed strategy for generating hierarchical double‐shelled nanoboxes is reported. Starting from the construction of hierarchical MOF‐on‐MOF architecture followed by a post‐annealing treatment, hierarchical TiO 2 @Co 3 O 4 nanoboxes are successfully synthesized with an interior TiO 2 shell supporting the outer hollow‐Co 3 O 4 ‐aggregates shell with a CoTiO 3 intermediate layer. The TiO 2 @Co 3 O 4 electrode displays a superior lithium storage performance in terms of high reversible capacity (920.5 mAh g −1 after 150 cycles at 200 mA g −1 , 58.6 % higher than theoretical capacity), outstanding high‐rate long‐term cycling stability (838.6 mAh g −1 after 600 cycles at 1000 mA g −1 , 44.5 % higher than theoretical capacity), and remarkable rate capability (good restorability at 2000 mA g −1 ). Furthermore, the morphology and electrochemical kinetic analysis proves that TiO 2 @Co 3 O 4 has a more stable structure, higher capacitive contribution, and better Li‐ion diffusion, which enhance the lithium‐storage performance.