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Formation of Double‐Shelled Zinc–Cobalt Sulfide Dodecahedral Cages from Bimetallic Zeolitic Imidazolate Frameworks for Hybrid Supercapacitors
Author(s) -
Zhang Peng,
Guan Bu Yuan,
Yu Le,
Lou Xiong Wen David
Publication year - 2017
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.201702649
Subject(s) - zeolitic imidazolate framework , dodecahedron , supercapacitor , zinc , bimetallic strip , cobalt , metal organic framework , materials science , imidazolate , cobalt sulfide , chemical engineering , sulfide , inorganic chemistry , chemistry , electrode , capacitance , metal , metallurgy , electrochemistry , adsorption , organic chemistry , crystallography , engineering
Complex metal–organic frameworks used as precursors allow design and construction of various nanostructured functional materials which might not be accessible by other methods. Here, we develop a sequential chemical etching and sulfurization strategy to prepare well‐defined double‐shelled zinc–cobalt sulfide (Zn‐Co‐S) rhombic dodecahedral cages (RDCs). Yolk‐shelled zinc/cobalt‐based zeolitic imidazolate framework (Zn/Co‐ZIF) RDCs are first synthesized by a controlled chemical etching process, followed by a hydrothermal sulfurization reaction to prepare double‐shelled Zn‐Co‐S RDCs. Moreover, the strategy reported in this work enables easy control of the Zn/Co molar ratio in the obtained double‐shelled Zn‐Co‐S RDCs. Owing to the structural and compositional benefits, the obtained double‐shelled Zn‐Co‐S RDCs exhibit enhanced performance with high specific capacitance (1266 F g −1 at 1 A g −1 ), good rate capability and long‐term cycling stability (91 % retention over 10,000 cycles) as a battery‐type electrode material for hybrid supercapacitors.