Ultrafine bismuth sulfide-based solid-state electrochemical capacitor in full wave AC-signal rectification application.

Abstract

Supercapacitors, also known as electrochemical capacitors, have been widely investigated as advanced energy-storage devices owing to their high-power density, moderately high energy density and long cycle life, while their integration into electronic circuits has emerged as a fascinating area of research that combines efficient energy storage with practical circuit-level functionality. In this study, organic molecule (pyrazole) stabilized bismuth sulfide nanoparticles were synthesized using a complexation mediated route, and an electrode fabricated based on these nanoparticles exhibited a specific capacity (S C) of 211 C g-1 at a scan rate of 5 mV s-1. The asymmetric capacitor made with bismuth sulfide as an anode and MXene as a cathode exhibited a maximum S C value of 43 C g-1 at a current density (C D) of 0.8 A g-1. The device delivered a maximum energy density (E D) of 17.9 Wh kg-1 with a corresponding power density (P D) of 2.6 kW kg-1 at 0.8 A g-1, while increasing the C D to 2.9 A g-1 resulted in an E D of 11.3 Wh kg-1 and a corresponding P D of 5.2 kW kg-1. The as-fabricated bismuth sulfide-based electrochemical capacitor was integrated into a full-wave bridge rectifier circuit for efficient conversion of alternating current (AC) into direct current (DC), demonstrating its potential for practical energy-storage and electronic circuit applications.

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