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Supercapacitor Electrodes Obtained by Directly Bonding 2D MoS 2 on Reduced Graphene Oxide
Author(s) -
da Silveira Firmiano Edney Geraldo,
Rabelo Adriano C.,
Dalmaschio Cleocir J.,
Pinheiro Antonio N.,
Pereira Ernesto C.,
Schreiner Wido H.,
Leite Edson Robeto
Publication year - 2014
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.201301380
Subject(s) - graphene , materials science , supercapacitor , oxide , molybdenum disulfide , capacitance , electrochemistry , electrode , chemical engineering , covalent bond , nanotechnology , composite material , metallurgy , organic chemistry , chemistry , engineering
Layered molybdenum disulfide (MoS 2 ) is deposited by microwave heating on a reduced graphene oxide (RGO). Three concentrations of MoS 2 are loaded on RGO, and the structure and morphology are characterized. The first layers of MoS 2 are detected as being directly bonded with the oxygen of the RGO by covalent chemical bonds (Mo‐O‐C). Electrochemical characterizations indicate that this electroactive material can be cycled reversibly between 0.25 and 0.8 V in 1 m HClO 4 solution for hybrids with low concentrations of MoS 2 layers (LCMoS 2 /RGO) and between 0.25 and 0.65 V for medium (MCMoS 2 /RGO) and high concentrations (HCMoS 2 /RGO) of MoS 2 layers on graphene. The specific capacitance measured values at 10 mV s −1 are 128, 265, and 148 Fg −1 for the MoS 2 /RGO with low, medium, and high concentrations of MoS 2 , respectively, and the calculated energy density is 63 W h kg −1 for the LCMoS 2 /RGO hybrid. This supercapacitor electrode also exhibits superior cyclic stability with 92% of the specific capacitance retained after 1000 cycles.