Excellent Energy Storage Performance of Perovskite High-Entropy Oxide-Modified (Bi0.5Na0.5)TiO3-Based Ceramics

IF 4.7 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2024-06-12 DOI:10.1021/acsaelm.4c00679

Xue Zhang, Fan Zhang*, Yiwen Niu, Zhiqiang Zhang, Xueqiong Lei and Zhan Jie Wang,

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Abstract

Due to the typical dielectric relaxation behavior of perovskite high-entropy ceramics (HECs), high-entropy engineering is beneficial for improving energy storage performance and has drawn extensive concern. In this study, high-entropy oxide (Bi_0.2Na_0.2Ba_0.2Sr_0.2Ca_0.2)(Ti_0.9Nb_0.1)O₃ (BNCBSTN)-modified 0.45(Bi_0.5Na_0.5)TiO₃-0.55(Sr_0.7Bi_0.2)TiO₃ (BNT-SBT) systems, BNT-SBT-xBNCBSTN (0 ≤ x ≤ 0.5) ceramics, were designed and prepared using a hydrothermal method. It is found that the introduction of BNCBSTN into BNT-SBT promotes the configuration entropy and induces strong dielectric relaxation behavior, thereby greatly improving the energy storage performance. In addition, grain refinement, increased resistivity, and widened band gap are achieved by the modification of BNCBSTN, leading to a significant enhancement of the breakdown electric field (E_b). Consequently, BNT-SBT-0.3BNCBSTN HEC exhibits a preeminent recoverable energy density (W_rec = 6.04 J/cm³) and energy storage efficiency (η = 85%) under an excellent E_b of 410 kV/cm as well as good temperature and frequency stability. The remarkable improvement in energy storage performance indicates that modifying the ferroelectric system with high-entropy oxide is a feasible approach for developing energy storage capacitors.

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Perovskite 高熵氧化物改性（Bi0.5Na0.5）TiO3 基陶瓷的卓越储能性能

由于包晶高熵陶瓷（HECs）具有典型的介电弛豫行为，高熵工程有利于提高储能性能，因此受到广泛关注。在这项研究中，高熵氧化物（Bi0.2Na0.2Ba0.2Sr0.2Ca0.2）（Ti0.9Nb0.1）O3（BNCBSTN）改性的 0.45（Bi0.5Na0.5）TiO3-0.55（Sr0.7Bi0.2）TiO3（BNT-SBT）体系，即 BNT-SBT-xBNCBSTN（0 ≤ x ≤ 0.5）陶瓷。研究发现，在 BNT-SBT 中引入 BNCBSTN 可促进构型熵，诱导强烈的介电弛豫行为，从而大大提高储能性能。此外，BNCBSTN 的改性还实现了晶粒细化、电阻率提高和带隙增宽，从而显著增强了击穿电场（Eb）。因此，BNT-SBT-0.3BNCBSTN HEC 在 410 kV/cm 的优异 Eb 下表现出卓越的可恢复能量密度（Wrec = 6.04 J/cm3）和储能效率（η = 85%），并具有良好的温度和频率稳定性。储能性能的显著提高表明，用高熵氧化物改造铁电系统是开发储能电容器的一种可行方法。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico

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