Titanium oxide aerogel/graphene oxide based electrode for electrochemical supercapacitors

Abstract

In order to build electrochemical energy storage electrodes, carbon composite materials containing nanosized metal oxides might be desirable. This article describes the designing of TiO₂ aerogel/graphene oxide (TiO₂-A/GO) composites for electrochemical supercapacitors. TiO₂-A was synthesized by a simple sol-gel process followed by annealing at 250°C and thereafter, different concentrations of GO were mixed to prepare TiO₂-A/GO composites via sonochemical method. The intermixing of GO and TiO₂-A in composite was confirmed by observing the structural and crystalline characterizations. Two electrode electrochemical system was used to elucidate the capacitive characteristics of TiO₂-A/GO composite electrode by cyclic voltammetry analysis. In comparison with TiO₂-A electrode, high specific capacitances (C_s) were recorded for TiO₂-A/GO composite electrode. TiO₂-A/2GO composite electrode attained the highest C_s value of ~338.2 Fg⁻¹ at 10 mVs⁻¹ with excellent cycle stability after 2000 cycles. Thus, the prepared TiO₂-A/GO composites-based electrode can be a promising material to achieve good capacitive properties.