Abstract
In this work, nanoflower-like MoS2 grown on the surface of multi-walled carbon nanotubes (MWCNTs)/polyaniline (PANI) nano-stem is synthesized via a facile in situ polymerization and hydrothermal method. Such a novel hierarchical structure commendably promotes the contact of PANI and electrolyte for faradaic energy storage. In the meanwhile, the double-layer capacitance of MoS2 is effectively used. The morphology and chemical composition of the as-prepared samples are characterized by scanning and transmission electron microscopies, X-ray diffraction and Fourier transform infrared spectra. The electrochemical performance of the samples is evaluated by cyclic voltammogram and galvanostatic charge–discharge measurements. It is found that the specific capacitance of the obtained MWCNTs/PANI/MoS2 hybrid is 542.56 F g−1 at a current density of 0.5 A g−1. Furthermore, the MWCNTs/PANI/MoS2 hybrid also exhibits good rate capability (62.5% capacity retention at 10 A g−1) and excellent cycling stability (73.71% capacitance retention) over 3000 cycles.
Highlights
In this work, nanoflower-like MoS2 grown on the surface of multi-walled carbon nanotubes (MWCNTs)/polyaniline (PANI) nano-stem is synthesized via a facile in situ polymerization and hydrothermal method
It can be seen that the specific capacitance of MoS2/PANI [29] and PANI/sulfonated MWCNTs [18] is not high and the cycling stability of CNTs-g-PANI [30] and graphene/PANI nanotube [34] is not ideal. We introduce both MWCNTs and MoS2 as a composite with PANI to be used as supercapacitor electrode material
The transmission electron microscopy (TEM) and scanning electron microscopy (SEM) morphologies of the as-prepared MoS2 and MWCNTs/PANI/MoS2 nanocomposites are shown in figure 2
Summary
70 mg of the purified MWCNTs was dispersed in 50 ml of 1 M HCl with ultrasonic treatment for 0.5 h. Pure PANI was prepared through the same procedure without MWCNTs. To synthesize the ternary hybrid MWCNTs/PANI/MoS2 nanocomposites, the as-prepared MWCNTs/ PANI (30 mg) was dispersed in 25 ml of deionized water with the help of ultrasonication for 40 min. Ammonium molybdate tetrahydrate ((NH4)6Mo7O24·4H2O, 0.1 g) and thiourea (0.086 g) were added into the MWCNTs/PANI suspension, and the mixture was sonicated for 10 min. After cooling down to room temperature naturally, the resulting black precipitates were collected by centrifugation with deionized water and dried in vacuum at 60°C for 24 h to obtain the ternary hybrid of MWCNTs/PANI/MoS2, abbreviated as MPM-0.1. MWCNTs/PANIMoS2 nanocomposites with different amounts of ammonium molybdate tetrahydrate 4 (0.06 g and 0.14 g) were prepared by using the same process, which were denoted as MPM-0.06 and MPM-0.14 (the mass ratio of ammonium molybdate tetrahydrate to thiourea was 1.16)
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