High-performance and stable CoSrS@rGO nanocomposite based electrode material for supercapattery device and electrochemical glucose sensor

Abstract Two-dimensional (2D) materials possess excellent electrical conductivity, notable pore size, and exceptional stability. In this research, the cobalt strontium sulfide (CoSrS) nanocomposite is synthesized using the hydrothermal process. The CoSrS@rGO nanocomposite electrode material showed much greater specific capacity of 1050 C g −1 compared to the undoped sample (300 C g −1 ), as determined by a three-electrode measuring setup. Moreover, the results obtained from the electrochemical impedance spectroscopy (EIS) and Brunauer–Emmett–Teller (BET) analyses indicated a noticeable enhancement in both surface area and conductivity. Further, the hybrid device (CoSrS@rGO//AC@PANI) showed power and energy densities of 39.5 Wh kg −1 and 3793 W kg −1 , respectively. The hybrid device exhibited a retention rate of 70% of its initial capacity over 2000 cycles. Besides, the CoSrS@rGO nanocomposite electrode material was effectively used as an electrode for the electrochemical glucose sensor. The device showed high sensitivity and stability against the glucose. The CoSrS@rGO nanocomposite electrode exhibited a sensitivity with an R 2 value of 0.99. This study offers valuable insights into the influence of temperature and conducting polymers on the performance of CoSrS@rGO nanocomposite electrode materials for multiple applications.