A ternary nanocomposite of reduced graphene oxide, Ag nanoparticle and Polythiophene used for supercapacitors

The ternary nanocomposites of reduced graphene oxide (rGO), Ag nanoparticles, and polythiophene (PTh), (rGO/Ag/PTh) with different initial feed ratios of [GO](o)/[Th](o) = 0.2, 0.3 and 0.4 were used in a symmetric supercapacitor device formation. rGO/Ag/PTh nanocomposite has been prepared by in-situ polymerization and chemical reduction of graphene oxide. Fourier transform infrared spectroscopy -Attenuated total reflectance (FTIR-ATR) and scanning electron microscopy (SEM) were employed in order to characterize the composition of the resulting nanocomposites and morphology. The electrochemical behavior of these nanocomposites were studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopic (EIS) measurements in 1.0M H2SO4 solution. As an electroactive material, rGO/Ag/PTh nanocomposite shows good capacitive performance in acidic electrolyte solution, a high specific capacitance (up to C-sp = 953.13 F/g at a scan rate of 4 mV/s) at [GO](o)/[Th](o) = 0.2. Moreover, the rGO/Ag/PTh nanocomposites at [GO](o)/[Th](o) = 0.2 show high stability with 91.88% specific capacitance saved after 1000 charge/discharge processes. Furthermore, larger energy density (up to E = 28.8 Wh/kg at a scan rate of 5 mV/s and a power density of P = 2843.3 W/kg at a scan rate of 1000 mV/s) of the nanocomposites at [GO](o)/[Th](o) = 0.2 is obtained in 1M H2SO4 aqueous electrolyte for two-electrode device formation. This study has revealed that the rGO/Ag/PTh nanocomposite electrode materials may lead to a stable supercapacitor for portable electronic applications. [GRAPHICS] .Scientific Research Project of Namik Kemal University, Tekirdag, Turkey [NKUBAP.01.GA.16.076]Scientific Research Project of Namik Kemal University, Tekirdag, Turkey, NKUBAP.01.GA.16.076

Synthesis of ternary polypyrrole/Ag nanoparticle/graphene nanocomposites for symmetric supercapacitor devices

In this study, novel ternary synthesis of reduced graphene oxide (rGO) sheets via intercalation of Ag nanoparticles (Ag) and polypyrrole (PPy) was obtained for supercapacitor evaluations. The synthesis procedure of nanocomposite is simple, cheap, and ecologically friendly. The nanocomposites were analyzed by Fourier transform infrared-attenuated transmission reflectance (FTIR-ATR) and scanning electron microscopy-energy dispersion X-ray analysis (SEM-EDX). In addition, electrochemical performances of electrode active materials (rGO/Ag/PPy) of the samples were tested by means of galvanostatic charge/discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The highest specific capacitance and energy density of rGO/Ag/PPy nanocomposite were obtained as C-sp = 1085.22 F/g and E = 36.92 Wh/kg for [rGO](o)/[Py](o) = 1/5 at 4 mV/s in 1 M H2SO4 solution. Under the optimized preparation conditions in different initial feed ratios ([rGO](o)/[Py](o) = 1/1, A 1/2, 1/5, and 1/10) of rGO/Ag/PPy, nanocomposites acquired a high Coulombic efficiency, and a retention of 66% of its initial capacitance for [rGO](o)/[Py](o) = 1/10 after 1000 cycles. GCD and EIS measurements of rGO/Ag/PPy nanocomposite electrode active material allowed for supercapacitor applications.Namik Kemal University, Tekirdag, TurkeyNamik Kemal University [NKUBAP.01.GA. 16.076]The fact that this study was financed by Namik Kemal University, Tekirdag, Turkey, project number: NKUBAP.01.GA. 16.076 is gratefully acknowledged. Authors also thank Expert Muhammet Aydin (Namik Kemal Uni., NABILTEM, Tekirdag, Turkey) for recording SEM-EDX and FTIR-ATR measurements