Fabrication of Highly Conductive Porous Fe3O4@RGO/PEDOT:PSS Composite Films via Acid Post-Treatment and Their Applications as Electrochemical Supercapacitor and Thermoelectric Material

As a remarkable multifunctional material, ferroferric oxide (Fe3O4) exhibits considerable potential for applications in many fields, such as energy storage and conversion technologies. However, the poor electronic ionic conductivities of classical Fe3O4 restricts its application. To address this challenge, nanoparticles are combined with graphene (GO) via typical hydrothermal method, followed by conductive wrapping using poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic sulfonate) (PEDOT:PSS) fabrication composite films. Upon acid treatment, highly porous Fe3O4@RGO/PEDOT:PSS hybrid is successfully constructed, each component exerts action that effectively facilitates electron transfer subsequent performance improvement. Specifically, film achieves high specific capacitance 244.7 F g−1 at current 1 A g−1. Furthermore, due to facial networks, free-standing advantages flexible thermoelectric (TE) materials. Notably, shows electric conductivity (σ) 507.56 S cm−1, three times greater value than Fe3O4@RGO component, an optimized Seebeck coefficient (S) 13.29 μV K−1 room temperature. This work provides novel route synthesis films possess promising conversion.