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Microwave-assisted hydrothermal synthesis and electrochemical characterization of niobium pentoxide/carbon nanotubes composites

Published online by Cambridge University Press:  30 January 2019

Ricardo M. Silva
Affiliation:
Materials Science and Engineering, Federal University of Pelotas, RS 96010-610, Brazil; and Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada
Bruno S. Noremberg
Affiliation:
Materials Science and Engineering, Federal University of Pelotas, Pelotas - RS 96010-610, Brazil
Natália H. Marins
Affiliation:
Materials Science and Engineering, Federal University of Pelotas, RS 96010-610, Brazil; and Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada
Jordan Milne
Affiliation:
Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada
Igor Zhitomirsky
Affiliation:
Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L8, Canada
Neftalí L.V. Carreño
Affiliation:
Materials Science and Engineering, Federal University of Pelotas, Pelotas - RS 96010-610, Brazil
Corresponding
E-mail address:
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Abstract

This study reports the fabrication of high mass loading (32 mg/cm2) electrodes of niobium pentoxide (Nb2O5) nanoparticles and carbon nanotubes (CNTs) using a facile procedure. The as-obtained Nb2O5 nanoparticles by microwave-assisted hydrothermal synthesis presented pseudohexagonal (TT) phase, and when exposed to the thermal treatment, the Nb2O5 nanoparticles changed to orthorhombic (T) phase. Distinct morphologies were obtained, which exhibited a specific surface area of 216 m2/g and 47 m2/g to pseudohexagonal and orthorhombic phases, respectively. Cyclic voltammetry and electrochemical impedance spectroscopy techniques were performed in a three-electrode system using 1 M Li2SO4 as electrolyte with a potential window of 0–0.9 V (versus standard calomel electrode). Both materials showed capacitive behavior with a specific capacitance of 0.11 F/cm2 and 0.09 F/cm2 to nanocomposites CNT + TT-Nb2O5 and CNT + T-Nb2O5 at 2 mV/s, respectively. Thus, an efficient, simple, and promising process to produce electrodes for supercapacitors was demonstrated.

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Article
Copyright
Copyright © Materials Research Society 2019 

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