Transition Metal-Doped Polyaniline/Single-Walled Carbon Nanotubes Nanocomposites: Efficient Electrode Material for High Performance Supercapacitors

Abstract

The demand for superior energy storage devices, such as supercapacitors, has been growing to meet the application requirements of hybrid vehicles and renewable energy systems. Here, we report a simple method to synthesize manganese chloride (MnCl2)-doped polyaniline (PANI)/single-walled carbon nanotubes (SWCNTs) nanocomposites for electrochemical supercapacitors. The possible interactions between MnCl2 and both PANI and SWCNTs was studied by Fourier transform infrared spectroscopy (FTIR), UV–visible spectroscopy, and Raman spectroscopy. The morphological characteristics of the electrode materials were investigated by field emission scanning microscopy (FESEM) and transmission electron microscopy (TEM). As-prepared nanocomposites showed higher electrical conductivity of 9.65 S/cm at room temperature and reached nonlinear current–voltage characteristics. A maximum specific capacitance of 546 F/g has been obtained for the nanocomposites at 0.5 A/g current density. Transition metal doping and SWCNTs enhance the electrochemical properties of the nanocomposites. The better specific capacitance and charge/discharge rates make them promising candidates as electrodes in supercapacitors, combining high energy densities with high levels of power delivery.

Silver nanoparticles decorated polypyrrole/graphene nanocomposite: A potential candidate for next‐generation supercapacitor electrode material

“…Pure PPy shows the granular like morphology, exhibited in Figure 8(a). 49,50 Figure 8(e,f) shows the HRTEM images of Ag-PPy/Gr nanocomposite at different positions. The rough surfaces of Gr also signify the uniform coating.…”

Electrochemical co‐deposition and characterization of polyaniline and manganese oxide nanofibrous composites for energy storage properties

“…The absorption bands appeared at 3,200 and 2,935 cm −1 were assigned to the stretching of N-H group present in aromatic amines. [49] Peaks at ~551 cm −1 and in lower regions indicate the presence of Mn-O bond. At 1,170 cm −1 , the absorption is associated with N=Q=N stretching, where Q represents quinoid ring while the peak at 816 cm −1 corresponds to the C-H bending vibration.…”

Transition metal doped poly(aniline-co-pyrrole)/multi-walled carbon nanotubes nanocomposite for high performance supercapacitor electrode materials

“…Alternatively, the absorption band at 608 nm is red shifted to 615 and 630 nm for poly(An-co-Py) Cu and poly(An-co-Py) Cu CNT nanocomposite, respectively. These peaks shifting phenomenon clearly suggests that there is a strong interaction between the quinoid rings of both PANI and PPy with MWCNTs and also due to doping effect [26,[33][34].…”

“…The increment of electrochemical properties mainly resulted due to several superior properties of SWCNTs and MWCNTs like small size, high conductivity, high stability and high surface area [22][23][24]. It was reported that the doping of conducting polymers by transition metal ions like Cu 2+ , Co 2+ , Mn 2+ , Zn 2+ , and Fe 3+ (works as redox active materials) improves the capacitance and thus enhances the energy density [25][26][27].…”

“…Here, the average diameter of the CuCl 2 doped copolymer coated MWCNTs is 40-50 nm and due to coating the diameter increases compared to acid modified MWCNTS. When the aniline and pyrrole monomer was added into the well suspension of MWCNTs solution then the occurrence of π -π* electron interaction between acid modified MWCNTs with aniline and pyrrole monomer as well as hydrogen bonding interaction with the carboxyl groups of the acid modified MWCNTs and the amino group of aniline monomers is the main reason behind uniform coating over acid modifiedMWCNTs surface[26].…”