Chromium redox chemistry unlocks record dielectric figure of merit in low-loading BaCrO4/PVDF nanocomposites for flexible energy storage.
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| Title: | Chromium redox chemistry unlocks record dielectric figure of merit in low-loading BaCrO |
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| Authors: | El-Masry, Mai M.1 (AUTHOR) mai_elmasry@hotmail.com, Elsayed, S. A.1 (AUTHOR), Abdelaziz, R. T.1 (AUTHOR), Ramadan, M. E.1 (AUTHOR), Ali, Y. A.1 (AUTHOR), Abdelaziz, H. M.1 (AUTHOR), Elsayed, W. A.1 (AUTHOR), Mahmoud, M. M.1 (AUTHOR), Fekry, Ph. H.1 (AUTHOR), Mahmoud, M. A.1 (AUTHOR), Mahmoud, J. S.1 (AUTHOR) |
| Source: | Journal of Materials Science: Materials in Electronics. Apr2026, Vol. 37 Issue 12, p1-18. 18p. |
| Subjects: | Dielectric materials, Oxidation-reduction reaction, Nanocomposite materials, Nanoparticles, Flexible electronics, Polyvinylidene fluoride, Energy storage |
| Abstract: | 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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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