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Coordination Polymers Derived General Synthesis of Multishelled Mixed Metal‐Oxide Particles for Hybrid Supercapacitors
Author(s) -
Guan Bu Yuan,
Kushima Akihiro,
Yu Le,
Li Sa,
Li Ju,
Lou Xiong Wen David
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201605902
Subject(s) - materials science , supercapacitor , oxide , ternary operation , amorphous solid , polymer , chemical engineering , electrolyte , metal , coordination polymer , hybrid material , mesoporous material , thermal stability , graphene , inorganic chemistry , electrochemistry , nanotechnology , organic chemistry , electrode , chemistry , composite material , metallurgy , catalysis , computer science , engineering , programming language
Metal–organic frameworks (MOFs) or coordination polymers (CPs) have been used as precursors for synthesis of materials. Unlike crystalline MOF, amorphous CP is nonspecific to metal cation species, therefore its composition can be tuned easily. Here, it is shown that amorphous CP can be used as general synthesis precursors of highly complex mixed metal oxide shells. As a proof of concept, NiCo coordination polymer spheres are first synthesized and subsequently transformed into seven‐layered NiCo oxide onions by rapid thermal oxidation. This approach is very versatile and can be applied to produce ternary and quaternary metal oxide onions with tunable size and composition. The NiCo oxide onions exhibit exceptional charge storage capability in aqueous electrolyte with high specific capacitance (≈1900 F g −1 at 2 A g −1 ), good rate capability, and ultrahigh cycling stability (93.6% retention over 20 000 cycles). A hybrid supercapacitor against graphene/multishelled mesoporous carbon sphere shows a high energy density of 52.6 Wh kg −1 at a power density of 1604 W kg −1 (based on active materials weight), as well as remarkable cycling stability.