Effect of polyvinylpyrrolidone (PVP) on electrochemical performance of iron pyrite (FeS₂) nanoparticle via hot-injection method

Transition metal sulfide (TMS) has gained much interest due to its excellent electrochemical properties and application in many devices. Herein, the composite of Iron Pyrite and PVP (FeS₂−PVP) via hot-injection method (HIM) was synthesized directly on a nickel foam substrate. By the Hot-injection method, we obtained FeS₂ nanoparticles with a short reaction time and simple method. This study also evaluates the effect of concentration, reaction time, and the precursor ratio on the pyrite structure and absorption properties. The X-Ray Diffraction (XRD) measurement confirmed that the Fe:S ratio of 1:4 shows the best crystallinity of FeS₂. This study observed the effect of PVP concentration on electrochemical performance. The electrochemical properties of FeS₂−PVP characterized using Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry (CV) with 3M KOH as the electrolyte. By the electrochemical characterization, FeS₂−PVP better electrochemical performance compared to pristine FeS₂. These results suggest that FeS₂−PVP is promising for the future development of high-performance electrical energy storage.