Development and Characterization of PbI₂ Nanoparticles for all Solid-State Flexible Supercapacitor Purposes

Abstract

The development and utilization of new energy sources has been extensively studied in the world. Here, we report the development of flexible self-supported metal-free electrodes based on non-oxidized graphene multilayer (MLG) paper containing the lead iodide nanoparticles (PbI₂-NPs). The PbI₂-NPs was obtained and characterized by X-ray diffraction (XDR) and Raman spectroscopy. Supercapacitor containing the PbI₂-NPs in MLG electrodes was fabricated by a simple method and characterized using atomic force microscopy (AFM), cyclic voltammetry (CV) and galvanostatic charge-discharge techniques. The results show a flexible supercapacitor fashion reaching capacitance values of 154 F/g with high prospects in electronic area. Energy and power densities obtained for the pure MLG supercapacitor were 3.40 µWh cm^-2 and 0.73 mW cm^-2, respectively. Regarding to PbI₂-NPs/MLG capacitor the energy and power density obtained were 3.50 Wh kg^-1 and 1.10 kW kg^-1. The results herein presented open the possibility to new energy storage devices using PbI₂-NPs and MLG flexible supercapacitor configuration.

Keywords:
PbI₂; Graphene; EDLC; Gel Electrolyte; Self-Standing; All-Solid-State Supercapacitor