Article,
In situ growth of manganese oxide nanosheets over titanium dioxide nanofibers and their performance as active material for supercapacitor
JOURNAL OF COLLOID AND INTERFACE SCIENCE, (2019)
DOI: 10.1016/j.jcis.2019.07.064
Abstract
In recent years, electrochemical energy devices, i.e. batteries, fuel
cells, solar cells, and supercapacitors, have attracted considerable
attention of scientific community. The architecture of active materials
plays a crucial role for improving supercapacitors performance. Herein,
titanium dioxide (TiO2) nanofibers (1D) have been synthesized by
electrospinning process and used as a backbone to manganese dioxide
(MnO2) nanosheets (2D) growth through hydrothermal method. This strategy
allows the obtaining of 1D/2D heterostructure architecture, which has
demonstrated superior electrochemical performance in relation to
pristine MnO2. The highest electrochemical performance is due to the
synergic effect between the metal oxides, where TiO2 nanofibers provide
electrochemical stability for active MnO2 phase. Thus, the designed TiO2@MnO2 structure can reach maximum specific capacitance of 525 Foe at
a current density of 0.25 A.g(-1), and it demonstrates an excellent
stability by retaining 81% of the initial capacitance with coulombic efficiency of 91%. Therefore, the novel architecture of TiO2@MnO2 based
on nanofibers and nanosheets exhibits superior electrochemical
properties to be used in supercapacitor applications. (C) 2019 Elsevier
Inc. All rights reserved.
