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Coating of Vertically Aligned Carbon Nanotubes by a Novel Manganese Oxide Atomic Layer Deposition Process for Binder‐Free Hybrid Capacitors
Author(s) -
Silva Ricardo M.,
Clavel Guylhaine,
Fan Yafei,
Amsalem Patrick,
Koch Norbert,
Silva Rui F.,
Pinicola
Publication year - 2016
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.201600313
Subject(s) - materials science , nanocomposite , carbon nanotube , chemical engineering , cyclic voltammetry , atomic layer deposition , electrode , layer (electronics) , scanning electron microscope , x ray photoelectron spectroscopy , oxide , composite material , nanotechnology , electrochemistry , metallurgy , chemistry , engineering
A novel atomic layer deposition process of manganese oxide from methylcyclopentadienyl manganese tricarbonyl and ozone has been developed. It is used to coat vertically aligned carbon nanotubes (VACNTs) grown on a conductive Inconel substrate in order to produce a 3D array of metal oxide‐carbon nanotube electrode. Electron microscopy studies show that a conformal polycrystalline film can be deposited on the VACNTs arrays. X‐ray diffraction, small area electron diffraction, and X‐ray photoelectron spectroscopy analysis determine the formation of hausmannite (Mn 3 O 4 ). The electrochemical properties of the as‐prepared VACNTs/Mn 3 O 4 nanocomposite electrodes are studied using cyclic voltammetry, galvanostatic charge and discharge cycling in 1 m Na 2 SO 4 aqueous electrolyte. Capacitances as high as 78.62 mF cm −2 at 5 mV s −1 are demonstrated which is one order of magnitude higher than that of pristine VACNTs. In addition, the as‐prepared VACNTs/Mn 3 O 4 nanocomposite electrode showed a good reversibility and cycling stability.