Drive towards Sonochemically Synthesized Ternary Metal Sulfide for High-Energy Supercapattery

Abstract

The present research focuses on, combining the chemistry of supercapacitors and batteries to get highly efficient hybrid energy storage devices. For projected drive, a novel battery-grade electrode material is introduced. In this regard, binary and ternary metal sulfides with different compositions are synthesized via a facile sonochemical route. The electrode material Co(25%)Cu(75%)MnS (S4) reveals prime electrochemical performance, possessing a maximum specific capacity of 503.5 C g−1 while operating at 0.5 A g−1 in a three-electrode assembly. The charge storage performance is further scrutinized in a two-electrode assembly. A supercapattery device (S4//AC) is fabricated by coupling the Co(25%)Cu(75%)MnS (positive) and activated carbon (negative) electrodes. The device displays outstanding energy storage performance with an ultrahigh energy density of 88.71 Wh kg−1 along with a power density of 320 W kg−1. The maximum power density delivered by the assembled supercapattery device is 8000 W kg−1 in parallel with an energy density of 20 Wh kg−1. The supercapattery device also demonstrates an excellent cyclic stability potential of 84% after 3000 continuous charge/discharge cycles. The outstanding outcomes of the fabricated device reveals its potential applications in high-performance energy storage technologies.