Ternary Composite of Molybdenum Disulfide-Graphene Oxide-Polyaniline for Supercapacitor
Ke Qu, Yuqi Bai, Miao Deng
Abstract
The ever-increasing need for small and lightweight power sources for use in portable or wearable electronic devices has spurred the development of supercapacitors as a promising energy storage and conversion system. In this work, a simple, facile and easy-to-practice method has been developed to employ carbon paper (CP) as the support to coat molybdenum disulfide (MoS 2 ) and graphene oxide (GO), followed by electrodeposition of polyaniline (PANI) to render CP/MoS 2 -GO-PANI. The preparation parameters, such as amounts of MoS 2 , GO and number of aniline electropolymerization cycles, have been optimized to render CP/MoS 2 -GO-PANI the best capacitive performance. The as-prepared optimal CP/MoS 2 -GO-PANI is characterized by X-ray powder diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy. The supercapacitive properties of CP/MoS 2 -GO-PANI as an electrode have been evaluated electrochemically via cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy testing. CP/MoS 2 -GO-PANI delivers a specific capacitance of 255.1 F g −1 at 1.0 A g −1 and exhibits excellent rate capability under larger current densities. Moreover, a symmetrical supercapacitor is assembled and three are connected in series to power a light-emitting diode for ∼15 min, demonstrating the promising application potential of CP/MoS 2 -GO-PANI-based supercapacitor.