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

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 …