Ternary Composite of Molybdenum Disulfide-Graphene Oxide-Polyaniline for Supercapacitor

• Published in: Journal of the Electrochemical Society 2021-12, Vol.168 (12), p.120542
• Main Authors: Qu, Ke, Bai, Yuqi, Deng, Miao
• Format: Article
• Language: English
• Subjects: carbon paper; light-emitting diode; MoS2; polyaniline; Symmetric supercapacitor
• ISSN: 0013-4651; 1945-7111
• DOI: 10.1149/1945-7111/ac3f1e

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.