A novel architectured BiCe metal organic framework-integrated MoS2 nanosheet: An intriguing strategy for deriving synergistic effects in high-performance symmetric supercapacitors

Abstract

Metal-organic framework (MOF) based supercapacitors have attracted enormous attention nowadays due to their unique physiochemical properties. In this study, we are addressing the synergistic effect of MoS₂ when intercalated with redox-active bimetallic MOF-2 to enhance the efficiency of the electrode material. Herein, bimetal MOF incorporating bismuth and cerium has been synthesized and MoS₂ is introduced to increase the electron transport potentially. All the samples underwent experimental characterization techniques to procure their crystal structure, morphology, surface area, and electrochemical properties. Electrochemical measurement demonstrates that the MOF-2@MoS₂ electrode presents a significant specific capacitance of 510 F g⁻¹ at a current density of 1 A g⁻¹ corresponding to a capacity of 255 C g⁻¹, while its initial capacitance remains at over 94 % even after 4500 cycles, with outstanding cycling stability. The MOF-2 rod-like structure is uniformly distributed on the surface and within the pores of the MoS₂ nanosheet, maintaining structural integrity throughout repeated cycles. Subsequently, a symmetric supercapacitor has been constructed using MOF-2@MoS₂ electrodes which delivers an energy density of 20.12 Wh kg⁻¹ at a power density of 799.47 W kg⁻¹, with excellent cycling stability of 92 % over 4500 cycles at 10 A g⁻¹. These findings suggest intercalating 2D material with bimetal MOF shows great promise for further practical application.