Unveiling the role of dopants in boosting CuS supercapacitor performance: insights from first-principles calculations.

Transition metal sulfides have become famous in high energy density supercapacitor materials owing to their rich redox and high conductivity. While their development has achieved a breakthrough in terms of capacitance, there is little knowledge from the theoretical perspective on how dopants play a role in enhancing their capacitances. In this work, pseudocapacitance and quantum capacitance were evaluated through first-principles calculation to describe their role in transition metal sulfide, which here is represented by copper sulfide (CuS).

Novel strategy for high-performance supercapacitors through the polyvinylpyrrolidone (PVP)-assisted growth of FeS.

Iron disulfide or pyrite (FeS) has emerged as a promising transition metal sulfide-based supercapacitor owing to its abundance and superb electrochemical properties. However, FeS still faces major hurdles in realizing its full potential, such as a low energy density and poor conductivity. In this study, we report a high-performance FeS supercapacitor synthesized by a direct one-step process with the help of polyvinylpyrrolidone (PVP).