Engineering Polypyrrole With Varying Concentration of Zinc Molybdate for Supercapacitor Electrode Materials

ABSTRACT

Conducting polymer‐bimetallic oxide composites have emerged as promising electrode materials due to their exceptional electrochemical performance for energy storage supercapacitor applications. In this work, we report the synthesis of ZnMoO ₄ , PPy, and PPy/ZnMoO ₄ via hydrothermal and in situ chemical oxidative polymerization methods. PPy/ZnMoO ₄ composites are prepared by varying (2.5 to 15 wt%) of ZnMoO ₄ content by weight of pyrrole monomer. XRD, FTIR, FESSEM, HRTEM, XPS, BET, and electrochemical analysis were employed to investigate the structural, morphological, and electrochemical properties of the electrode materials. It was found that the optimized PPy/ZnMoO ₄ (PZ‐5) composite delivered the highest specific capacitance of 272.5 F g ⁻¹ at 1 A g ⁻¹ with a capacitance retention of 96.9% after 2000 cycles at 5 A g ⁻¹ . The fabricated symmetric system supercapacitor achieved a specific capacitance of 144.5 F g ⁻¹ at 1 A g ⁻¹ and retained 95.2% of its initial capacitance after 2000 cycles, demonstrating remarkable cyclic stability. The symmetric supercapacitor also exhibited a high energy density of 12.8 Wh kg ⁻¹ at a power density of 1594.3 W kg ⁻¹ . This work highlights the effects of incorporating ZnMoO ₄ into PPy for enhancing capacitance and offering a feasible approach to enhance the electrochemical performance of the PPy‐based electrode materials for supercapacitor applications.