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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 BaCrO4/PVDF nanocomposites for flexible energy storage.
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]
Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Chromium redox chemistry unlocks record dielectric figure of merit in low-loading BaCrO&lt;subscript&gt;4&lt;/subscript&gt;/PVDF nanocomposites for flexible energy storage.
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  Data: 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 (&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 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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  Data: &lt;i&gt;Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10854-026-17117-y
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        Text: English
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        PageCount: 18
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      – SubjectFull: Dielectric materials
        Type: general
      – SubjectFull: Oxidation-reduction reaction
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      – SubjectFull: Nanocomposite materials
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      – TitleFull: Chromium redox chemistry unlocks record dielectric figure of merit in low-loading BaCrO4/PVDF nanocomposites for flexible energy storage.
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              Text: Apr2026
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