Novel synthesis of layeredMoS₂/TiO₂/CNTnanocomposite as a potential electrode for high performance supercapacitor applications

Abstract

Summary This work is aimed to synthesize hybrid nanocomposite electrode materials for supercapacitor applications. The carbon nanotubes (CNTs) are incorporated into MoS2 as well as TiO2 to form different hybrid electrode materials such as MoS2/CNTs, TiO2/CNTs, and MoS2/TiO2/CNTs in an effort to improve the electrochemical performance. The resulting hybrid electrode materials are examined by SEM, TEM, XRD, XPS, and Raman studies. Cyclic voltammetry and galvanostatic charge‐discharge tests are used to evaluate the specific capacitance and charge‐discharge stability of the synthesized MoS2/TiO2/CNTs. Among the hybrid electrode materials investigated, the MoS2/TiO2/CNTs exhibits superior electrochemical performance with specific capacitance of 1252.57 mA h/g at a scan rate 20 mV/s as compared with MoS2/CNTs (810.53 mA h/g), TiO2/CNTs (607.10 mA h/g), and CNTs (204.35 mA h/g). All electrochemical tests were carried out in a solution of 1 M KOH. The Rct and Rf for the MoS2/TiO2/CNTs electrode were found to be 1.7 Ω.cm2 and 2.1 Ω.cm2, respectively, which were significantly lower than the corresponding Rct (40.2 Ω.cm2) and Rf (51.1 Ω.cm2) for the CNTs electrode, indicating that the MoS2/TiO2/CNTs has a significantly lower overall impedance, which could be one of the key factors responsible for the improved electrochemical performance of the MoS2/TiO2/CNTs. Moreover, this MoS2/TiO2/CNTs hybrid electrode displays good cycling stability with the capacitance retention of 98.83% after 10 000 cycles of charge‐discharge at 1 A/g. The energy density and power density of MoS2/TiO2/CNTs composites are found to be 757.80 Wh/kg and 4546.80 W/kg respectively.

Carbon nanotube‐based polymer nanocomposites: Evaluation of barrier, hydrophobic, and mechanical properties for aerospace applications

“…Figure 2A,C,E,G, respectively, display the SEM images of raw CNTs, APTMS/CNTs, CNTs/MoS 2 , and APTMS/CNTs‐MoS 2 . Figure 2A confirms that the tube walls of CNTs are planar, upright, and homogenous 48 . The encapsulation of APTMS increases the total surface region of the nanotubes in Figure 2B as compared with pure CNTs.…”

“…Figure 2A confirms that the tube walls of CNTs are planar, upright, and homogenous. 48 The encapsulation of APTMS increases the total surface region of the nanotubes in Figure 2B as compared with pure CNTs. The APTMS/CNT composites had a surface that was irregular, wrinkle-shaped, and had less CNT space than clean CNTs.…”

Studies on improved stability and electrochemical activity of metal oxides/sulfides‐based polymer nanocomposites for energy storage applications

“…In 3 M KOH solution, the EIS was carried out using a three‐electrode setup throughout a frequency range of 100 kHz–10 mHz at 10 mV. A supercapacitor's Nyquist plot is usually composed of three sections: a Warburg resistance at low frequency, a series resistance at high frequency, and a charge transfer resistance at mid frequency 70–75 . Figure 11A shows the Nyquist plots obtained for P3MT, P3MT/NiO, P3MT/NiS, and P3MT/NiO/NiS nanocomposites electrode materials.…”

“…A supercapacitor's Nyquist plot is usually composed of three sections: a Warburg resistance at low frequency, a series resistance at high frequency, and a charge transfer resistance at mid frequency. [70][71][72][73][74][75] Figure 11A shows the Nyquist plots obtained for P3MT, P3MT/NiO, P3MT/ NiS, and P3MT/NiO/NiS nanocomposites electrode materials. The EIS data were fitted using ZSimpWin based on the equivalent electrical circuit.…”