N-doped Bi2S3 nanoflower as an efficient supercapacitor electrode based on the highly concentrated salt electrolyte

As a low-cost and environmentally friendly new energy storage device, supercapacitors suffer from a low energy density, significantly restricting their potential applications. Hence, exploring supercapacitors with elevated energy density and wide potential windows has become a key research focus. Metal sulfides are receiving notable interest for their benefits, such as superb electrical conductivity, efficient charge storage, and cost-effectiveness. This study utilized ultrasonic methods to rapidly prepare Bi2S3 nanoflowers, followed by the synthesis of N-doped Bi2S3 through urea pyrolysis. And its supercapacitor behavior of N-doped Bi2S3 in 10 M NaNO3 electrolyte was studied. The assembled N–Bi2S3//N–Bi2S3 symmetric capacitor exhibited a high energy density of 112 Wh kg−1 when power density is 7828 W kg−1. The study provides a new scientific avenue for exploring the design of supercapacitors with high capacity and wide potential windows.