Capacitive properties of vanadium oxides on carbon nanotubes (CNTs) have been investigated. In structural properties, the Raman spectrum shows the characteristic peaks of V 2 O 5 , and XPS analysis predicts that the atomic ratio of as-prepared vanadium oxide is approximately the same as that of the stoichiometric V 2 O 5 . Cross-sectional scanning electron microscope images show that CNTs provide good support for uniform distribution of vanadium pentoxides. In capacitive behaviors, CNTs covered with uniformly dispersed oxides lead to a significantly improved capacitive performance, as compared with bare oxide films. Therefore, such V 2 O 5 /CNT nanocomposites are a potential material for power backup of hybrid electrical vehicles or portable electronics.
V(2)O(5) nanofilms (NFs) uniformly distributed on N-doped carbon nanotubes (CNTs) exhibit significantly stable capacitive performance; the synthesized composites are promising as an instantaneous power supply in consumer electronics or electrical vehicles.
Fast charging–discharging performances of well-dispersed
RuO2
nanoparticles (NPs) on N-doped carbon nanotubes (CNTs) have been demonstrated. As
regards the structural properties, the N 1s x-ray photoelectron spectroscopy spectrum shows
two characteristic bonding peaks of N within CNTs. Cross-sectional scanning electron
microscope images show that N-doped CNTs provide good support for uniform distribution of
RuO2
NPs. As regards the capacitive behavior, N-doped CNTs covered with well-dispersed
RuO2
NPs lead to a high charging–discharging property performed at the scan rate of
2000 mV s−1. The role of N doping is to create preferential sites of CNTs for capturing
RuO2
NPs. Such a fast sweep capability established by the N-incorporation method is very useful
in supercapacitor applications.
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