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Hollow NiCo 2 S 4 Nanospheres Hybridized with 3D Hierarchical Porous rGO/Fe 2 O 3 Composites toward High‐Performance Energy Storage Device
Author(s) -
Wang Yan,
Chen Zexiang,
Lei Tao,
Ai Yuanfei,
Peng Zhenkai,
Yan Xinyu,
Li Hai,
Zhang Jijun,
Wang Zhiming M.,
Chueh YuLun
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201703453
Subject(s) - materials science , graphene , nanoparticle , electrolyte , chemical engineering , composite number , oxide , porosity , dissolution , supercapacitor , electrode , nanotechnology , composite material , electrochemistry , metallurgy , chemistry , engineering
Hierarchical hollow NiCo 2 S 4 microspheres with a tunable interior architecture are synthesized by a facile and cost‐effective hydrothermal method, and used as a cathode material. A three‐dimensional (3D) porous reduced graphene oxide/Fe 2 O 3 composite (rGO/Fe 2 O 3 ) with precisely controlled particle size and morphology is successfully prepared through a scalable facile approach, with well‐dispersed Fe 2 O 3 nanoparticles decorating the surface of rGO sheets. The fixed Fe 2 O 3 nanoparticles in graphene efficiently prevent the intermediates during the redox reaction from dissolving into the electrolyte, resulting in long cycle life. KOH activation of the rGO/Fe 2 O 3 composite is conducted for the preparation of an activated carbon material–based hybrid to transform into a 3D porous carbon material–based hybrid. An energy storage device consisting of hollow NiCo 2 S 4 microspheres as the positive electrode, the 3D porous rGO/Fe 2 O 3 composite as the negative electrode, and KOH solution as the electrolyte with a maximum energy density of 61.7 W h kg −1 is achieved owing to its wide operating voltage range of 0–1.75 V and the designed 3D structure. Moreover, the device exhibits a high power density of 22 kW kg −1 and a long cycle life with 90% retention after 1000 cycles at the current density of 1 A g −1 .