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One‐Step Synthesis of Nanostructured CoS 2 Grown on Titanium Carbide MXene for High‐Performance Asymmetrical Supercapacitors
Author(s) -
Liu Hao,
Hu Rui,
Qi Jiqiu,
Sui Yanwei,
He Yezeng,
Meng Qingkun,
Wei Fuxiang,
Ren Yaojian,
Zhao Yulong,
Wei Wenqing
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201901659
Subject(s) - supercapacitor , materials science , capacitance , electrode , titanium carbide , graphene , mxenes , composite number , electrochemistry , oxide , chemical engineering , power density , nanoparticle , nanotechnology , current density , carbide , composite material , metallurgy , chemistry , power (physics) , physics , quantum mechanics , engineering
MXene (2D titanium carbide) as the electrode material for supercapacitors has been studied extensively and deeply in recent years. In order to enhance the electrochemical performance of MXene, CoS 2 nanoparticles grown on MXene surface are constructed by a simple one‐step solvent thermal method. CoS 2 nanoparticles play a crucial part in increasing the active sites of metal ions on the surface of MXene. In three‐electrode system, the obtained MXene/CoS 2 composite delivers high performance. Its specific capacitance can be up to 1320 F g −1 at a current density of 1 A g −1 and it shows remarkable cycle performance with 78.4% after 3000 cycles at 10 A g −1 . Moreover, the asymmetric supercapacitors (ASCs) with reduced graphene oxide as the negative electrode and MXene/CoS 2 composite as the positive electrode exhibit a wide potential window of 1.6 V and high energy density (28.8 Wh kg −1 ) at a power density of 800 W kg −1 . After 5000 cycles, the ASCs maintain 98% of initial specific capacitance at 5 A g −1 . These results can effectively promote the application in the supercapacitor materials.