abstract
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 (Mn3O4). The electrochemical properties of the as-prepared VACNTs/Mn3O4 nano-composite electrodes are studied using cyclic voltammetry, galvanostatic charge and discharge cycling in 1 m Na2SO4 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/Mn3O4 nanocomposite electrode showed a good reversibility and cycling stability.
keywords
CHEMICAL-VAPOR-DEPOSITION; THIN-FILMS; SUPERCAPACITOR ELECTRODES; OZONE DECOMPOSITION; RAMAN-SPECTROSCOPY; OXYGEN EVOLUTION; BATTERIES; OXIDATION; SURFACES; CATALYST
subject category
Chemistry; Materials Science
authors
Silva, RM; Clavel, G; Fan, YF; Amsalem, P; Koch, N; Silva, RF; Pinna, N
our authors
Ricardo Manuel Fonseca Lopes da Silva
Junior Researcher
Rui Ramos Ferreira e Silva
Associate Professoracknowledgements
R. M. Silva is very grateful to Fundacao para a Ciencia e a Tecnologia (FCT) for the grant SFRH/BD/90844/2012. The authors would like to acknowledge A. J. S. Fernandes from University of Aveiro for the Raman spectra. This work was partially developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and co-financed by FEDER under the PT2020 Partnership Agreement. The Collaborative Research Center 1109 is acknowledged for fruitful discussion.