Silver sulfide nanosheets: a proficient electrode material for energy storage

Abstract

The present work emphasizes the fabrication of pioneering electrodes (α-Ag₂S, silver sulfide) for high-performance supercapacitors via simple chemistry approach. α-Ag₂S nanomaterials prepared in the present study exhibited a unique morphology with highlighting electrochemical features. When tested as an electrode material in three-cell configuration, α-Ag₂S electrode shows excellent rate performance (286.2 C g⁻¹ at a scan rate of 2 mV s⁻¹) with superior cycle life (~91% capacity retention after 10,000 cycles) and possesses a meager charge transfer resistance (0.35 Ω). Also, an asymmetric supercapacitor (ASC, Ag₂S//6 M KOH//graphene) was designed using polypropylene as separator. The fabricated ASC could be capable of retaining 80.0% of initial capacitance over 7500 continuous charge/discharge cycles at a practical specific current of 40 A g⁻¹. Such enduring qualities will create a fresh pathway for innovative electrodes in the SC market.