Heterolayered 2D Nanohybrids of Graphene-WS<sub>2</sub> Nanosheets: Enabling Enhanced Supercapacitive Performance of Polyaniline
Tao Feng, Yufan Mo, Shuo Lv, Gang Liu
Abstract
Integrating polyaniline (PANI) with two-dimensional (2D) nanostructures is a promising strategy to improve electrochemical performance. In this work, 2D laminar van der Waals heterostructures of graphene and WS 2 nanosheets were prepared for the enhancement of the supercapacitive performance of PANI. With well-dispersed graphene/WS 2 nanosheet hybrids (G-LS/WS 2 -LS) as deposition supports, the in situ polymerization of aniline delivered a ternary nanocomposite PANI/G-LS/WS 2 -LS. Benefiting from the good electrical conductivity and chemical stability of graphene, as well as the high redox activity of WS 2, the ternary nanocomposite (PANI/G-LS/WS 2 -LS) exhibited significantly enhanced electrochemical performance as compared with PANI. Typically, a high specific capacitance of 421.5 F/g was delivered at a current density of 1 A/g in a three-electrode system, which is more than 1.5 times that of PANI (274.1 F/g at 1 A/g). Additionally, the symmetric supercapacitor based on PANI/G-LS/WS 2 -LS showed good electrochemical stability with a 71.6% capacitance retention after 10,000 cycles at 5 A/g and a high specific energy of 9.96 W h/kg at a specific power of 250.04 W/kg. The study provides a facile approach to boost the electrochemical performance of conductive polymers for efficient and reliable energy storage.