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High‐Power Supercapacitive Properties of Graphene Oxide Hybrid Films with Highly Conductive Molybdenum Disulfide Nanosheets
Author(s) -
Byun Segi,
Sim Dong Min,
Yu Jin,
Yoo Jung Joon
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500393
Subject(s) - materials science , graphene , supercapacitor , molybdenum disulfide , annealing (glass) , oxide , chemical engineering , electrochemistry , electrolyte , capacitance , nanotechnology , electrode , composite material , metallurgy , chemistry , engineering
By introducing a graphene oxide (GO) sheet as a phase stabilizer and a mechanical supporter, MoS 2 /GO hybrid films consisting of a high concentration of distorted 1T‐MoS 2 are successfully fabricated through a post‐annealing process in air with the form of a restacked film. After the annealing process, the MoS 2 nanosheets undergo direct binding with the oxygen functional groups of GO, maintaining their highly conducting 1T phase and leading to distorted 1T‐MoS 2 or 1T′‐MoS 2 . A hybrid film‐based supercapacitor reveals significantly enhanced electrochemical properties, such as an ultrahigh volumetric power density (≈207 W cm −3 ), high volumetric capacitance (≈380 F cm −3 at 10 mV s −1 ), superior rate capability, and a semi‐permanent cycle life (95 % retention after 10 000 cycles) in an aqueous electrolyte.