Zinc Strontium Sulfide@Carbon nanotube composite electrode materials for high-performance supercapattery devices

High-performance energy storage devices (ESD) are essential to address the rising demand for electric energy. Hybrid energy storage systems provide moderate energy and power density as it merges batteries and supercapacitors. This study used the zinc strontium sulfide (ZnSrS) incorporated with carbon nanotube (CNT) for supercapattery devices. The surface area of CNT@ZnSrS was determined using Brunauer Emmett Teller (BET) calculations to be 17.73 m2g−1. A three-electrode configuration was used to compute the specific capacity of CNT, ZnSrS, and CNT@ZnSrS. The anticipated capacity for CNT@ZnSrS was 788 Cg−1, higher than individual ZnSrS and CNT. In the design of the supercapattery, CNT@ZnSrS served as a positive, while activated carbon was the negative electrode. The specific capacity of the supercapattery device (CNT@ZnSrS//AC) was 192 Cg−1. The supercapattery (CNT@ZnSrS//AC) delivers a superior energy density of 45.23 Wh-kg−1. Additionally, the stability test on the supercapattery device (CNT@ZnSrS//AC) was performed by submitting it to 10,000 consecutive charging/discharging cycles. After completing these cycles, this device shows excellent capacity retention of 91%. This research indicates that incorporating CNT significantly improves the electrochemical performance of ZnSrS as advanced material for energy in hybrid energy storage devices in the future.