Realizing high energy density in BiFeO3-based ceramics capacitors via bandgap engineering and polarization optimization

被引：23

作者：

Guo, Huitao ^{[1
,2
]}

Zeng, Fangfang ^{[1
,2
]}

Xiao, Wenrong ^{[1
]}

Jiang, Shenglin ^{[1
]}

Chen, Yuxin ^{[1
,2
]}

Wang, Bowen ^{[1
,2
]}

Fan, Guifen ^{[1
,2
]}

Lu, Wenzhong ^{[1
,2
]}

Tu, Zhengkai ^{[3
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Key Lab Funct Mat Elect Informat B, MOE, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, Wenzhou Adv Mfg Inst, Wenzhou 325035, Peoples R China

[3] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 461卷

基金：

中国国家自然科学基金;

关键词：

Energy storage; Bismuth ferrite; Composition design; Bandgap engineering; Polar nanoregion; LEAD-FREE CERAMICS; STORAGE DENSITY; TEMPERATURE; EFFICIENCY;

D O I：

10.1016/j.cej.2023.142071

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

BiFeO3-based lead-free ferroelectrics possess high spontaneous polarization. Nevertheless, achieving ultrahigh recoverable energy density in BiFeO3-based ceramics is limited by large remanent polarization and insufficient breakdown strength. Herein, (0.7-x)BiFeO3-0.3Ba(Hf0.05Ti0.95)O3-xNaTaO3 ceramics were designed and pre-pared. It exhibited a high recoverable energy density of 6.3 J/cm3 and high efficiency of 86.6 % due to the contribution of large breakdown strength and optimized polarization (high maximum polarization and small remanent polarization). These contributions stem from NaTaO3 being introduced into the 0.7BiFeO3-0.3Ba (Hf0.05Ti0.95)O3 matrix, which successfully brought in widened bandgap Eg, increased resistivity, and enhanced relaxor behavior. Large breakdown strength is also promoted by dense microstructure and decreased average grain size. This work proves that the strategies of bandgap engineering and polarization optimization for improving energy storage performance in BiFeO3 are practicable.

引用

页数：8

共 51 条

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