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Anchoring samarium oxide nanoparticles on reduced graphene oxide for high-performance supercapacitor

2017; Elsevier BV; Volume: 402; Linguagem: Inglês

10.1016/j.apsusc.2017.01.021

1873-5584

Amin Shiralizadeh Dezfuli, Mohammad Reza Ganjali, Hamid Reza Naderi,

Graphene research and applications

We have synthesized Sm2O3 nanoparticles (SmNs) and anchored them onto the surface of reduced graphene oxide (RGO) through a self-assembly thereof by utilizing a facile sonochemical procedure. The nanomaterials were characterized by means of powder X-ray diffraction (XRD), Field-emission scanning electron microscopy (FE-SEM), fourier transform infrared spectroscopy (FT-IR) spectra, and X-ray photoelectron spectroscopy (XPS). As the next step, the supercapacitive behavior of the resulting nanocomposites were investigated when used as electrode material, through with cyclic voltammetric (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) techniques. The SmNs decorated RGO (SmN-RGO) nanocomposites were found to possess a specific capacitance (SC) of 321 F g−1 when used in a 0.5 M Na2SO4 solution as an electrolyte, in a scan rate of 2 mV s−1. The SC of the SmN-RGO based electrodes were also found to be 268 F g−1 at a current density of 2 A g−1 through galvanostatic charge-discharge tests. The outstanding properties of the SmN-RGOs were attributed to synergy of the high charge mobility of SmNs and the flexibility of the sheets of RGOs. Additionally, the nano-composite revealed a unique cycling durability (maintaining 99% of its SC even after 4000 cycles).