Optically, magneto-dielectrically, and ferroelectrically modified Zn-Co-Cu-Ce/GNPs nanocomposites for dielectric energy storage applications

IF 9.6 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2026-10-01 Epub Date: 2026-02-26 DOI:10.1016/j.jre.2026.02.019

Atta Ur Rehman, Nasir Amin, Muhammad Ajaz-un-Nabi, Kiran Mehmood, Kashif Javaid, Mongi Amami, Lamia ben Farhat, Muhammad Imran Arshad

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引用次数: 0

Abstract

This study explored the structural, optical, magneto-dielectric, ferroelectric, and dielectric energy storage behavior of Zn_0.5Co_0.25Cu_0.25Ce_0.037Fe_1.963O₄/graphene nanoplatelets (ZCCCF/GNPs) nanocomposites with varying GNPs content (0 wt% −5 wt%), synthesized via self-combustion followed by bath sonication. Structural analysis confirmed the spinel phase for all compositions, with ZCCCF/3.75 wt% GNPs exhibiting the largest crystallite size (57.90 nm) and improved crystallinity. Optical studies reveal a tunable energy bandgap (

E_{g}

), and find that

E_{g}

is 3.20 eV for the 3.75 wt% GNPs composite. Dielectric results show the maximum dielectric constant (ε′ = 22.60), low loss tangent (tanδ = 0.3), and maximum quality factor for the 3.75 wt% GNPs composite. Magnetic measurements indicate enhanced soft magnetic behavior, with maximum saturation magnetization (M_s) (155 A·m²/kg) and minimum coercivity (41 × 10⁻⁴ T). Ferroelectric analysis reveals an increase in polarization from 1.45 × 10⁻⁴ μC/cm² (ZCCCF) to 9.07 × 10⁻⁴ μC/cm² (3.75 wt% GNPs). The maximum energy density (3.99 × 10⁻⁴ mJ/cm³) also occurs at 3.75 wt% GNPs, while higher addition of GNPs (5 wt% GNPs) leads to efficiency recovery (η = 58%) but reduces energy storage due to increased dielectric losses. A comparative analysis with literature reports highlights the superior energy storage performance of ZCCCF/GNPs nanocomposites over conventional ferrites, making them promising candidates for dielectric energy storage applications.

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光学、磁介电和铁电改性Zn-Co-Cu-Ce/GNPs纳米复合材料的介电储能应用

本研究探索了不同GNPs含量（0 wt% ~ 5 wt%）的Zn0.5Co0.25Cu0.25Ce0.037Fe1.963O4/石墨烯纳米片（ZCCCF/GNPs）纳米复合材料（ZCCCF/GNPs）的结构、光学、磁介电、铁电和介电储能行为，该复合材料通过自燃和浴声合成。结构分析证实了所有成分均为尖晶石相，其中ZCCCF/3.75 wt% GNPs的结晶尺寸最大（57.90 nm），结晶度提高。光学研究揭示了一个可调谐的能量带隙（Eg），并发现对于3.75% wt% GNPs的复合材料，Eg为3.20 eV。电介质测试结果表明，3.75 wt% GNPs复合材料的最大介电常数（ε′= 22.60）、低损耗正切（tanδ = 0.3）和最大品质因子。磁性测量表明，软磁行为增强，最大饱和磁化强度（Ms）（155 A·m2/kg）和最小矫顽力（41 × 10−4 T）。铁电分析表明，极化从1.45 × 10−4 μC/cm2 （ZCCCF）增加到9.07 × 10−4 μC/cm2 （3.75 wt% GNPs）。最大能量密度（3.99 × 10−4 mJ/cm3）也出现在3.75 wt% GNPs时，而更高的GNPs添加量（5 wt% GNPs）导致效率恢复（η = 58%），但由于介电损耗增加而降低了能量存储。与文献报道的对比分析表明，ZCCCF/GNPs纳米复合材料的储能性能优于传统铁氧体，使其成为介电储能应用的有希望的候选材料。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.