Enhanced electrochemical performance with exceptional capacitive retention in Ce-Co MOFs/Ti₃C₂T_x nanocomposite for...

This study introduces a high-performance Ce-Co MOFs/Ti₃C₂T_x nanocomposite, synthesized via hydrothermal methods, designed to advance supercapacitor technology. The integration of Ce-Co metal-organic frameworks (MOFs) with Ti₃C₂T_x (Mxene) yields a composite that exhibits superior electrochemical properties. Structural analyses, including X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), confirm the successful formation of the composite, featuring well-defined rod-like Ce-Co MOFs and layered Ti₃C₂T_x sheets. Electrochemical evaluation highlights the exceptional performance of the Ce-Co MOFs/Ti₃C₂T_x nanocomposite, achieving a specific capacitance of 483.3 Fg⁻¹ at 10 mVs⁻¹, a notable enhancement over the 200 Fg⁻¹ of Ce-Co MOFs. It also delivers a high energy density of 78.48 Whkg⁻¹ compared to 19 Whkg⁻¹ for Ce-Co MOFs. Remarkably, the nanocomposite shows outstanding cyclic stability with a capacitance retention of 109 % after 4000 cycles and electrochemical surface area (ECSA) of 845 cm², coupled with a reduced charge transfer resistance (R_ct) of 2.601 Ω and an equivalent series resistance (ESR) of 0.8 Ω. These findings demonstrate that the Ce-Co MOFs/Ti₃C₂T_x nanocomposite is a groundbreaking material, offering enhanced energy storage, conductivity, and durability, positioning it as a leading candidate for next-generation supercapacitors.