CuO@NiO/Polyaniline/MWCNT Nanocomposite as High-Performance Electrode for Supercapacitor

Abstract

This work reports facile and well-controlled synthesis of a number of binary, ternary, and quaternary nanocomposites using combinations of metal oxides (CuO, NiO), multiwalled carbon nanotubes (MWCNTs), and conducting polymer polyaniline (PANI) for application as electrode in supercapacitor. X-ray diffraction and electron microscopic analyses confirmed the formation of different composites made of binary CuO@NiO, ternary CuO@PANI/ MWCNT, NiO@PANI/MWCNT, and quaternary CuO@ NiO/PANI/MWCNT nanocomposites. Such combination of materials has not been reported previously, and with specific capacitance of 1372 F g −1 and good cyclic stability (83% capacity retention after 1500 cycles), the quaternary nanohybrid electrode shows the best performance compared to all other binary and ternary electrodes tested and promises to be a very good electrode material for supercapacitor application. The improved performance of the quaternary nanocomposite is attributed to the well-designed structural advantages and the synergistic effects of the components that lead to significant reduction in the charge transfer resistance as revealed by electrochemical impedance spectroscopy. Thus, we show a simple method to control the charge storage capacity of CuO-and/ or NiO-based electrodes by suitable selection of their surface morphology and combining with MWCNT and PANI. The results may have large potential in the development of novel electrode materials for a supercapacitor using CuO and/or NiO and may be further extended to other transition-metal-oxide-based electrodes.

Electrochemical Performance of Manganese Coordinated Polyaniline

“…This is used to define the rate of the electrochemical reaction . The diffusion coefficients of PANI/CP and PANI‐Mn/CP electrodes are calculated using Randle–Sevcik equation where, is the peak current for a quasi‐reversible system in amps, A is the electrode area (cm 2 ), C is the concentration (mol cm −3 ), n is the number of electrons transferred in the redox reaction (generally n = 1), D is the diffusion coefficient (cm 2 s −1 ) and ν is the scan rate (V s −1 ).…”

“…Obviously, PANI-Mn presents superior capacitance retention than PANI. [41] = 2.69 10 ACn D p quasi 5 3/2 1/2 1/2 In comparison with PANI, the cross-linked porous microstructure of PANI-Mn could act as an ion buffer reservoir to promote Faradaic reaction more actively during charge and discharge process.…”

Influence of La3+induced defects on MnO2–carbon nanotube hybrid electrodes for supercapacitors

“…With the increase in scan rate, the cathodic (I pc ) and anodic peak (I pa ) current also increases and their ratio (I pa /I pc ) was estimated ~1 indicating reversible redox reaction [43]. Both…”

High-rate transition metal-based cathode materials for battery-supercapacitor hybrid devices

“…[167][168][169] With the capability of strengthening the conductivity and stability of electrode materials by forming a high conductive layer, 170,171 polyaniline is widely implemented in energy devices by coupling with pseudocapacitive electrode materials. [172][173][174] Cao et al synthesized V 2 O 5 /PANI nanomaterials via in situ one-step oxidative polymerization of aniline monomers, which will insert vanadium vacancies and PANI on the surface of V 2 O 5 (Fig. 9a).…”