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

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.