Hydrothermal Development of Bimetallic Sulfide Nanostructures as an Electrode Material for Supercapacitor Application
Salma Aman, Saeed D. Alahmari, Sajjad Ahmad Khan, Abdullah G. Al‐Sehemi, Syeda Rabia Ejaz, Naseeb Ahmad, F. F. Alharbi, Asma Sadaf, Hafiz Muhammad Tahir Farid
Abstract
Supercapacitors (SCs) possess specialized capabilities and exhibit rapid charging and discharging rates, making them highly suitable for integration into portable energy storage and conversion devices. These devices have witnessed a notable surge in demand and are increasingly contributing to the overall progress of the global energy industry. However, the bimetallic sulfide displays a high energy density, and high capacitance helps to resolve the limitation of monometallic sulfide. This study examines the advantageous characteristics of AgBiS 2 as a viable energy storage medium in electrochemistry. These characteristics encompass a high level of electrical conductivity and a relatively low cost. AgBiS 2 nanostructures were effectively synthesized in the laboratory by utilizing a straightforward hydrothermal method. The produced nanostructure of AgBiS 2 is subjected to a range of evaluations encompassing electrochemical and physiochemical analyses. A specimen of AgBiS 2 was positioned onto a substrate composed of nickel foam to facilitate measurement of its capacitance. The combined effect of Ag and rate and the supercapacitor’s electrochemical performance. The galvanometric charge–discharge (GCD) profile of an AgBiS 2 nanostructure, obtained using a three-electrode configuration in 2.0 M KOH, demonstrates a specific capacitance ( C s ) of 650 F g –1 at 1 A g –1 current density. Additionally, the nanostructure exhibits a capacitive retention of 89% over 7000 cycles within the potential range 0–0.6 V (Ag/AgCl). When subjected to symmetric analysis, the AgBiS 2 electrode exhibits a significant specific capacitance ( C s ) of 401 F g –1 . This high capacitance is observed at 1 A g –1 in a two-electrode setup, employing an aqueous electrolyte of 2.0 M KOH. The symmetric AgBiS 2 electrode-based supercapacitor exhibits a specific energy ( S E ) of 65 Wh kg –1 and a specific power ( S P ) of 0.28 W kg –1 . The capacitive outcomes depend on the larger interfacial area, synergistic effect, and low resistance value. According to capacitive investigations, the AgBiS 2 electrode exhibits potential utility in various domains, including but not limited to supercapacitor applications, photocatalysis, water splitting, and water remediation.