Sheet-like praseodymium molybdate as a high-performance electrode material for asymmetric supercapacitors

초록

In this study, we report a one-step hydrothermal synthesis of sheet-like praseodymium molybdate (Pr2(MoO4)3) and its application as a promising electrode material for high-performance asymmetric supercapacitors. Detailed structural and surface analyses were employed using X-ray diffraction and scanning electron microscopy confirm the formation of a pure, crystalline Pr2(MoO4)3 phase with unique sheet morphology, offering an enlarged surface area and efficient ion diffusion pathways. X-ray photoelectron spectroscopy analysis revealed mixed valence states of Pr and Mo, enhancing redox activity. When tested in a three-electrode setup, the Pr2(MoO4)3 fabricated nickel foam (Pr2(MoO4)3/NF) achieved a high specific capacitance of 669.14 F/g at 1 A/g with excellent cyclic stability (91.5% after 2000 cycles). The fabricated asymmetric device (Pr2(MoO4)3)//AC) exhibited a specific capacitance of 27.76 F/g at 1 A/g, an energy density and power density of 9.55 Wh/kg and 2400 W/kg, and retained 87.9% of its initial capacitance after 10,000 charge-discharge cycles, demonstrating excellent long-term electrochemical stability. The observed electrochemical performance originates from the reversible multivalent redox transitions of Pr and Mo centers within Pr2(MoO4)3, which facilitate rapid charge transfer and stable ion diffusion, positioning it as a promising electrode material for next-generation energy storage devices.

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