Chemical route synthesis of nanohybrid MoO3-rGO for high-performance hybrid supercapacitors

Abstract

Asymmetric Hybrid supercapacitor (AHS) is distinguished by a combination of electrostatic and electrochemical storage mechanisms. High performance of AHS is based on MoO3 (MO) hybridized with reduced graphene oxide (rGO). In the present study, a single step hydrothermal method was used to synthesise MO and MoO3-rGO (MOG) nanohybrid materials. MO and MOG samples were then used to prepare electrodes. These electrodes were subjected to CV, GCD, and EIS analyses with three- and two-electrode systems. Results showed that the MOG-2 composite achieved a higher specific capacity of 607.82 C g−1 than bare MO at 96 C g−1 at a sweep rate of 2 mVs−1 in the three-electrode system. Thus, rGO can effectively enhance active sites for redox reactions. At current density of 1 A g−1, the MOG//rGO had the highest specific capacity of 188.40 C g−1. Based on GCD evaluation, the HSC coin cell device had a maximum energy density of 36.78 Whkg−1 and a power density 2546.84 Wkg−1and the device retained 87.6 % capacity after 10,000 cycles.