Fabrication of ZnSnO3@In2O3 core-shell based 1D microfiber heterostructure for high energy density asymmetric supercapacitors

Abstract

Core-shell microfibers have witnessed a substantial demand surge in developing supercapacitors (SCs) owing to their enhanced conductivity, high surface area, and structural stability. Here, we report a facile low-cost electrospun ZnSnO3 @In2O3 core-shell microfibers heterostructure for SC application. The distinct fibrous morphology and synergistic incorporation of Zinc (Zn), Tin (Sn), and Indium (In) demonstrate significantly enhanced electrochemical performance while assembled in an asymmetric SC (ASC) by utilizing ZnSnO3 @In2O3 core-shell as positive and activated carbon (AC) as negative electrode. The ASC device exhibits an excellent specific capacitance of 160 F/g at 1 A/g along with a maximum specific energy of 40 Wh/kg. The ASC also records 86.95% capacitance retention with an exceptional 90% coulombic efficiency retention over 15,000 cycles at 15 A/g. This novel ZnSnO3 @In2O3 core-shell//AC signifies great potential in achieving high-performance electrochemical energy storage devices.