Preparation and electrochemical performance of double perovskite La₂CoMnO₆ nanofibers

Abstract

Through electrospinning, La₂CoMnO₆ nanofibers were prepared from a polyvinylpyrrolidone/lanthanum nitrate-cobalt acetate-manganese acetate (PVP/LCM) precursor and were used as electrode materials. The morphologies and structures of the samples were characterized by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) specific surface area analysis. The results show that the prepared La₂CoMnO₆ nanofibers are stable, one-dimensional structures formed from interconnected La₂CoMnO₆ nanoparticles with a diamond-like crystal structure. The specific surface area of the fibers is 79.407 m²·g⁻¹. Electrochemical performance tests with a three-electrode system reveal the specific capacitance of the La₂CoMnO₆ nanofibers as 109.7 F·g⁻¹ at a current density of 0.5 A·g⁻¹. After 1000 charge-discharge cycles at a current density of 1 A·g⁻¹, the specific capacitance maintains 90.9% of its initial value, demonstrating a promising performance of the constraint capacitance and good cyclic stability.

Keywords

electrospinning / double perovskite / super capacitor / electrode materials

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