Electron beam induced synthesis of Ru-rGO and its super capacitive behavior

• Published in: 2d materials Vol. 6; no. 4; pp. 45030 - 45041
• Main Authors: Saykar, Nilesh G, Phatangare, Ambadas, Banerjee, I, Bhoraskar, V N, Ray, Asim K, Mahapatra, S K
• Format: Journal Article
• Language: English
• Published: IOP Publishing 16.08.2019
• Subjects: electron beam irradiation; Ru-rGO; supercapacitor
• ISSN: 2053-1583; 2053-1583
• DOI: 10.1088/2053-1583/ab3304

We report an in situ synthesis of ruthenium-reduced graphene oxide (Ru-rGO) using 6 MeV electron beam assisted radiolytic reduction method and its supercapacitive behavior. X-ray diffraction (XRD), transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) explore Ru nanoparticles of size ~2 nm are decorated on rGO sheets. Raman spectroscopy shows ID/IG ratio increased and formation of bilayer rGO after electron beam irradiation. The defect density in Ru-rGO is increased due to the electron beam irradiation as compared to its counterpart GO. The Ru-rGO based supercapacitor exhibits specific capacitance (128.1  ±  5.59) F g−1 at 10 mV s−1 scan rate. The specific capacitance retention of Ru-rGO is up to 99.4% at 900 cycles while it increases to 130% at 5000 cycles. Discharge curve of the supercapacitor involves three current decay processes viz. activation polarization, ohmic polarization and concentration polarization. The highest energy density of (4.125  ±  0.19) W h kg−1 and power density of 1.44 kW kg−1 are achieved with Ru-rGO supercapacitor. This unique electron beam assisted techniques illustrates a promising method of the fabrication of high performance supercapacitor.