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Enhanced supercapacitance of vertically aligned multi‐wall carbon nanotube array covered by MoS 2 nanoparticles
Author(s) -
Koroteev V. O.,
Kuznetsova I. V.,
Kurenya A. G.,
Kanygin M. A.,
Fedorovskaya E. O.,
Mikhlin Y. L.,
Chuvilin A. L.,
Bulusheva L. G.,
Okotrub A. V.
Publication year - 2016
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600366
Subject(s) - carbon nanotube , materials science , molybdenum disulfide , nanoparticle , x ray photoelectron spectroscopy , raman spectroscopy , chemical engineering , redox , cyclic voltammetry , nanorod , nanotube , molybdenum , nanotechnology , electrode , electrochemistry , chemistry , composite material , physics , optics , engineering , metallurgy
Vertically aligned multi‐wall carbon nanotube (VA‐MWCNT) arrays have been used for deposition of molybdenum sulphide from a water solution of ammonia molybdate and thiourea. A hydrothermal synthesis at 175 °C resulted in formation of quasi‐spherical nanoparticles inside and on the top surface of arrays without destruction of the array structure. X‐ray photoelectron spectroscopy revealed a molybdenum disulfide (MoS 2 ) composition of the nanoparticles, while Raman spectroscopy detected the bands characteristic of light scattering in the MoS 2 crystallites only after a treatment of synthesis products in hydrogen flow. As compared to the initial VA‐MWCNTs, the composites showed enhanced specific capacitances in 1M H 2 SO 4 electrolyte especially at low scan rates due to redox reactions involving MoS 2 . The reactions were more pronounced for the hydrogen treated composite. Cyclic voltammetry curves demonstrate an enhanced specific capacitance of MoS 2 /MWCNT array (fragment of the structure is shown in the insert) as compared to initial array due to redox reactions.