Tailoring phase evolution via high-entropy engineering for superior energy storage properties in (Na0.5Bi0.5)0.75Sr0.25TiO3-based ceramics

被引:1
|
作者
Wu, Chunhui [1 ]
Pu, Yongping [1 ]
Lu, Xiang [1 ]
Ning, Yating [1 ]
Zhang, Lei [1 ]
Liu, Zenghui [2 ,3 ]
Yang, Yongqiang [1 ]
机构
[1] Shaanxi Univ Sci & Technol, Sch Mat Sci & Engn, Xian 710021, Peoples R China
[2] Xi An Jiao Tong Univ, Elect Mat Res Lab, Key Lab, Minist Educ, Xian 710049, Peoples R China
[3] Xi An Jiao Tong Univ, Int Ctr Dielect Res, Sch Elect & Informat Engn, Xian 710049, Peoples R China
基金
中国国家自然科学基金;
关键词
High-entropy perovskite ceramics; Configurational entropy; Phase evolution; Energy-storage properties; INTERFACIAL POLARIZATION; PERFORMANCE; DENSITY; STRATEGY;
D O I
10.1016/j.cej.2024.157561
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
High-entropy engineering has garnered significant attention for innovation of dielectric capacitors. However, to meet the demands of the burgeoning market for next-generation advanced capacitors, challenges remain in optimizing the recoverable energy-storage density (Wrec). To address this, a stepwise high-entropy tactic is proposed via integrating four core effects of high-entropy systems with phase transition and energy-storage performance. This technique induces a remarkable Wrec 7.4 J/cm3 at 400 kV/cm in (Na0.5Bi0.5)0.75Sr0.25Ti1-x(Al1/4Zr1/4Hf1/4Nb1/4)xO3 ceramics (x = 0.00, 0.08, 0.12, 0.16, 0.20). The incorporation of multiple ions with diverse radii and valence states at the B-site enhances the degree of disorder and lattice distortion, contributing to tuning phase evolution and suppressing interfacial polarization, thereby delaying saturation polarization. Furthermore, impressive thermal endurance (30 130 degrees C), frequency stability (1 100 Hz) and a rapid discharge rate t0.9 of 37.6 ns are also yielded. This work paves the way for the advancement of novel ceramics by tailoring phase transition using a high-entropy strategy.
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页数:11
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