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<p>Herein, we report a novel approach to dielectric nanocomposites through strategic incorporation of barium chromate (BaCrO<sub>4</sub>) nanoparticles into a polyvinylidene fluoride (PVDF) matrix. Leveraging the unique mixed-valence chromium chemistry (Cr<sup>6+</sup>/Cr<sup>3+</sup>) and defect-rich structure of 10–40 nm BaCrO<sub>4</sub> nanoparticles, we demonstrate unprecedented dielectric enhancement with permittivity values exceeding 900 at only 6 wt% loading—representing a 7,400% improvement over pristine PVDF while maintaining low loss tangent (&lt; 0.05) at operational frequencies (&gt; 10 kHz). Comprehensive characterization reveals that this exceptional performance stems from a synergistic triad of mechanisms: interfacial Maxwell–Wagner-Sillars polarization, defect-mediated hopping conduction through chromium redox centers, and BaCrO<sub>4</sub>-induced <i>β</i>-phase nucleation in PVDF. Our BaCrO<sub>4</sub>/PVDF nanocomposites achieve a record dielectric figure of merit exceeding 18,000. The achievement of ultra-high permittivity at such low-loading levels (6 wt%) is critical, as it theoretically preserves the high breakdown strength of the PVDF matrix, suggesting significant potential for future energy storage applications. This work establishes a new design principle for dielectric materials by harnessing transition metal redox chemistry at polymer-ceramic interfaces, opening promising pathways for flexible energy storage, high-frequency electronics, and multifunctional dielectric applications.</p>

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Chromium redox chemistry unlocks record dielectric figure of merit in low-loading BaCrO4/PVDF nanocomposites for flexible energy storage

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Mai M. El-Masry,
  • S. A. Elsayed,
  • R. T. Abdelaziz,
  • M. E. Ramadan,
  • Y. A. Ali,
  • H. M. Abdelaziz,
  • W. A. Elsayed,
  • M. M. Mahmoud,
  • Ph. H. Fekry,
  • M. A. Mahmoud,
  • J. S. Mahmoud

摘要

Herein, we report a novel approach to dielectric nanocomposites through strategic incorporation of barium chromate (BaCrO4) nanoparticles into a polyvinylidene fluoride (PVDF) matrix. Leveraging the unique mixed-valence chromium chemistry (Cr6+/Cr3+) and defect-rich structure of 10–40 nm BaCrO4 nanoparticles, we demonstrate unprecedented dielectric enhancement with permittivity values exceeding 900 at only 6 wt% loading—representing a 7,400% improvement over pristine PVDF while maintaining low loss tangent (< 0.05) at operational frequencies (> 10 kHz). Comprehensive characterization reveals that this exceptional performance stems from a synergistic triad of mechanisms: interfacial Maxwell–Wagner-Sillars polarization, defect-mediated hopping conduction through chromium redox centers, and BaCrO4-induced β-phase nucleation in PVDF. Our BaCrO4/PVDF nanocomposites achieve a record dielectric figure of merit exceeding 18,000. The achievement of ultra-high permittivity at such low-loading levels (6 wt%) is critical, as it theoretically preserves the high breakdown strength of the PVDF matrix, suggesting significant potential for future energy storage applications. This work establishes a new design principle for dielectric materials by harnessing transition metal redox chemistry at polymer-ceramic interfaces, opening promising pathways for flexible energy storage, high-frequency electronics, and multifunctional dielectric applications.