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Streszczenie:
Nickel–iron-layered double hydroxides (NiFe-LDH) are known for their strong electrochemical activity and low cost, yet their practical use in energy-storage devices is restricted by limited electrical conductivity and sluggish ion transport. To address these limitations, conductive additives are commonly incorporated into hydroxide frameworks to enhance charge mobility and overall electrochemical response. In this study, a binder-free NiFe-LDH/Ti3C2Tₓ MXene nanocomposite was fabricated through a hydrothermal synthesis route and then applied as a supercapacitor electrode. Material characterization results confirmed the successful formation of NiFe-LDH with uniformly dispersed MXene sheets, yielding a nanoflower-like hierarchical structure. Such architecture increased the accessible surface area and generated a highly porous network, both of which promoted efficient electrochemical reactions. Electrochemical evaluation of the prepared electrode revealed a specific capacitance of 1512 F g−1 at 0.75 A g−1, along with strong rate performance. Furthermore, the assembled asymmetric supercapacitor delivered an energy density of 47.25 Wh kg−1 and a power density of 700 W kg−1, while retaining 65% of its capacitance after 10,000 charge–discharge cycles. The performance was improved compared to previous work on NiFe LDH due to strong interfacial coupling between LDH nanosheets and functionalized MXene surfaces.

Streszczenie:
The rising demand for durable, high-power energy storage devices has driven the advancement of innovative electrode materials for modern supercapacitors. In this regard, microwave-assisted synthesis has emerged as a fast and energy-saving approach for producing nanocomposites with superior electrochemical features. In this work, Ce(OH)3-x wt%rGO (x = 5, 10, and 15) nanocomposites were prepared through a simple microwave-assisted route to enhance electrochemical efficiency in supercapacitor systems. Structural and morphological characterizations using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) analysis confirm the effective incorporation of Ce(OH)3 with reduced graphene oxide (rGO) sheets, resulting in improved crystallinity, abundant defect sites, and larger surface area. Electrochemical testing in a three-electrode setup shows that the optimized CeG-10 electrode delivers a specific capacitance of 1229 F/g at 1 A/g, with strong rate capability and minimal internal resistance. Long-term cycling experiments demonstrate 92% capacitance retention after 10000 charge–discharge cycles, confirming excellent structural and electrochemical durability. Moreover, the fabricated supercapacitor device achieves an energy density of 49.46 Wh/kg at a power density of 1400 W/kg. These findings emphasize the promising potential of microwave-assisted Ce(OH)3-rGO nanocomposites as efficient electrode materials for next-generation energy storage technologies.