Facial Synthesis of Fe3O4/PPy Core-Shell Composite ElectrodeMaterial for Boosted Supercapacity

Polypyrrole (PPy) has great potential for applica-tionsasasupercapacitorelectrode owing to its excellentpseudocapacitance. However, the large volume changes duringthe rapid charge and discharge process lead to damage to thestructure, which is the main obstacle to practical applications. Here,the core-shell structure composite composed of magneticferroferric oxide (Fe3O4) nanoparticles and PPy was prepared bysolution polymerization. In the Fe3O4/PPy composite, Fe3O4nanoparticles play the role of reaction template, which can bearranged in a line under a magneticfield, thereby starting theadhesion polymerization of PPy to form a stable core-shellstructure with excellent capacitance. The as-synthesized Fe3O4/PPyelectrode presents a significantly enhanced specific capacitance of697 F g-1at 1.0 A g-1. In particular, the as-synthesized Fe3O4/PPy composite achieved a high energy density of 96.8 Wh kg-1at 500Wkg-1. This study paves a way to develop materials with high electrochemical performance and may promote the practicalapplication of high-capacity energy storage materials.