▎ 摘　　要

A fast chemical route for the synthesis of tertiary butyl hydroquinone (TBHQ) functionalized reduced graphene oxide (FRGO) and their application as high performance electrode materials for supercapacitors have been reported. Reductions of chemically exfoliated graphene oxides (GO) in the presence of small amount of TBHQ (1-2 wt % with respect to GO) at various time periods were investigated through XRD, FTIR and Raman studies. Reappearance of broad diffraction peak close to graphite peak (002) reveals an efficient method of reduction of different oxygen containing functional groups present in GO/FGO resulting in a decrease of interlayer d-spacing (similar to 3.5 angstrom). Absence of the absorption peaks in FTIR for -C = O, t-O-H, epoxide and alkoxy groups supports the complete reduction of GO to FRGO by hydrazine hydrate within a short time period of 4 h reduction under reflux condition. A large red shift in UV spectrum of FRGO - 4 h (270 nm) reveals the complete reduction of graphene oxide. The average crystallite sp(2) domains sizes have been estimated through Raman spectroscopy. Plausible mechanism of TBHQ assisted fast chemical reduction of FGO has been enumerated. 1.5 wt % TBHQ in FRGO shows the best electrochemical performance where TBHQ not only acts as a reducing agent during functionalization, but also plays as an active redox molecule for enhanced capacitance of 200 Fig. (C) 2015 Elsevier B.V. All rights reserved.