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Constructing CoO/Co 3 S 4 Heterostructures Embedded in N‐doped Carbon Frameworks for High‐Performance Sodium‐Ion Batteries
Author(s) -
Guo Can,
Zhang Wenchao,
Liu Yi,
He Jiapeng,
Yang Shun,
Liu Mingkai,
Wang Qinghong,
Guo Zaiping
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201901925
Subject(s) - materials science , heterojunction , electrochemistry , anode , oxide , chemical engineering , doping , electrochemical kinetics , density functional theory , nanoparticle , electrode , sulfide , kinetics , carbon fibers , nanotechnology , optoelectronics , chemistry , composite number , composite material , computational chemistry , engineering , metallurgy , physics , quantum mechanics
Heterostructures are attractive for advanced energy storage devices due to their rapid charge transfer kinetics, which is of benefit to the rate performance. The rational and facile construction of heterostructures with satisfactory electrochemical performance, however, is still a great challenge. Herein, ultrafine hetero‐CoO/Co 3 S 4 nanoparticles embedded in N‐doped carbon frameworks (CoO/Co 3 S 4 @N‐C) are successfully obtained by employing metal‐organic frameworks as precursors. As anodes for sodium ion batteries, the CoO/Co 3 S 4 @N‐C electrodes exhibit high specific capacity (1029.5 mA h g −1 at 100 mA g −1 ) and excellent rate capability (428.0 mA h g −1 at 5 A g −1 ), which may be attributed to their enhanced electric conductivity, facilitated Na + transport, and intrinsic structural stability. Density functional theoretical calculations further confirm that the constructed heterostructures induce electric fields and promote fast reaction kinetics in Na + transport. This work provides a feasible approach to construct metal oxide/sulfide heterostructures toward high‐performance metal‐ion batteries.