Design of PEO/HPMC/CMC-CuO nanocomposite electrolytes for high-performance dielectric capacitors
Keywords:
Highlights • A sustainable PEO/HPMC/CMC-CuO nanocomposite electrolyte was developed for dielectric capacitors. • Increasing CuO concentration reduces crystallinity, boosting amorphous regions and ionic conductivity. • FT-IR and UV–Vis analyses confirm strong CuO-polymer interactions and reduced energy gaps. • The 9 wt% CuO nanocomposite showed optimal AC conductivity and stable dielectric performance. • Enhanced capacitance and discharge energy density highlight suitability for advanced energy storage applications.Abstract
This study introduces an innovative nanocomposite polymer electrolyte, PEO/HPMC/CMC–CuO, tailored for application in dielectric capacitors. The incorporation of CuO significantly enhanced the morphological, optical, and electrical characteristics of the ternary blend. The structural analysis by XRD revealed a reduction in crystallinity with increasing CuO content, indicating the formation of more amorphous regions that enhance ion mobility. FT-IR spectroscopy revealed robust interactions between the CuO nanofillers and the polymer blend, evidenced by specific shifts and the broadening of characteristic vibrational bands. UV–Vis results showed a substantial decrease in optical bandgaps, from 4.58 eV (direct) and 3.25 eV (indirect) in pure PEO/HPMC/CMC to 3.12 eV (direct) and 1.39 eV (indirect) in the 9 wt% CuO sample, pointing to enhanced charge transfer characteristics. Electrical performance assessments demonstrated that the nanocomposite with 9 wt% CuO exhibited the maximum AC conductivity of 1.71 × 10−9 S/cm at room temperature. These comprehensive results affirm the capability of PEO/HPMC/CMC–CuO nanocomposites as promising candidates for high-performance dielectric capacitors, particularly in the realm of sustainable energy storage.References
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