Interfacial Engineering of Titanium Carbide (Ti₃C₂Tₓ) MXene and Samarium Cobalt Phosphate (SmCoPO₄) Nanostructures Boosts Charge Storage in Hybrid Supercapacitors‏

The growing adoption of electric vehicles and smart devices has driven an escalating demand for advanced energy storage systems. In this study, we synthesize a novel nanocomposite composed of samarium cobalt phosphate integrated with a titanium carbide-based MXene (Ti₃C₂Tₓ@SmCoPO₄) and evaluate its electrochemical performance. Using a conventional three-electrode configuration, the Ti₃C₂Tₓ@SmCoPO₄ hybrid electrode delivered an impressive specific capacity of 1220 C g⁻1 at 1.5 A g⁻1. To examine its practical applicability, an asymmetric supercapacitor device (Ti₃C₂Tₓ@SmCoPO₄//AC) was assembled, employing Ti₃C₂Tₓ@SmCoPO₄ as the anode and activated carbon (AC) as the cathode. The device exhibited excellent electrochemical behavior, achieving a specific capacity of 131.5 C g⁻1 at 1.0 A g⁻1, along with outstanding cycling stability, retaining 97.4% of its initial capacity after 12,000 charge–discharge cycles. Moreover, the device demonstrated a high energy density of 46.75 Wh kg⁻1 and a power density of 830 W kg⁻1. These results underscore the potential of Ti₃C₂Tₓ@SmCoPO₄ nanocomposites as high-performance electrode materials for next-generation energy storage systems. Herein, we report the rational design and synthesis of a novel samarium cobalt phosphate–MXene nanocomposite (Ti₃C₂Tₓ@SmCoPO₄) as an advanced electrode material. Unlike conventional MXene-based hybrids, this study uniquely integrates a rare-earth phosphate with Ti₃C₂Tₓ, creating a synergistic interface that enhances electrical conductivity, charge storage capability, and structural robustness. These findings highlight the first demonstration of a SmCoPO₄–MXene hybrid, establishing a new materials platform where rare-earth phosphate chemistry and 2D carbide frameworks are combined to overcome key limitations of conventional supercapacitor electrodes. The synergistic combination of Ti₃C₂Tₓ MXene and SmCoPO₄ offers a versatile platform capable of meeting the rigorous demands of modern energy storage and environmental applications.