Facile synthesis of Ce₂(WO₄)₃-decorated polyaniline composites as promising electrode material for supercapacitor applications

In the present work, rare earth metal oxides composed of cerium tungstate/polyaniline (Ce₂(WO₄)₃/PANI) composites were prepared by an in situ chemical oxidative polymerization process and their supercapacitive behavior was evaluated. The structural and morphological properties of the Ce₂(WO₄)₃/PANI composites were characterized via spectral and analytical techniques. X-ray diffraction revealed that the two prominent peaks for Ce₂(WO₄)₃ and PANI located at 2θ = 28.3° and 25.4° were in good accordance with the observed 2θ values in Ce₂(WO₄)₃/PANI composite. Field-emission scanning electron microscopy (FESEM) studies of Ce₂(WO₄)₃/PANI had a nano-spherical interconnected with a layer-like morphology, which results in a rapid electron exchange. Electrochemical analysis revealed that Ce₂(WO₄)₃/PANI exhibited an increased supercapacitor electrode response with a significant specific capacity (C_s) of 399 C g⁻¹ at 1 Ag⁻¹ and exhibited a remarkable capacity retention of 90.5% even after 3000 galvanostatic charge-discharge (GCD) cycles with 84% columbic efficiency, suggesting its promising electrode material for SCs.