Enhancing supercapacitor performance with innovative nanocomposite: Electrochemical investigation of reduced graphene oxide-supported copper manganese dual-metal organic frameworks

Abstract

Supercapacitors have attracted considerable attention because of their benefits in terms of high power density, rapid charge-discharge rates, and extended cycle life. Metal-organic framework materials (MOFs), known for their exceptionally high surface area and adjustable pore architectures, are extensively employed in the realm of energy conversion and storage. Nevertheless, the inadequate conductivity of MOF materials impedes their desirable electrochemical performances when employed as electrode materials in supercapacitors. We utilized a straightforward solvothermal technique to produce graphene-supported Cu/Mn-BTC metal-organic framework materials. These materials were then used as electrode materials for supercapacitors. Mn-BTC was effectively incorporated onto the surface and into the pores of Cu-BTC via solvothermal treatment. The incorporation of reduced graphene oxide (rGO) greatly increased the conductivity of MOF materials. In the three-electrode testing system, the graphene-supported Cu/Mn-BTC electrode material exhibited a specific capacitance of 362.2 C g−1 at the current density of 1 A g−1. Assembled into a symmetric supercapacitor, the novel material achieved a specific capacitance of 141.46 F g−1 at 1 A g−1, with a maximum energy density of 12.6 Wh kg−1 at a power density of 111.1 W kg−1. After 1000 charge-discharge cycles, the capacitance retention rate was 83.55 %.