材料科学
陶瓷
透射率
电介质
储能
粒度
带隙
透明陶瓷
化学计量学
光电子学
空位缺陷
工程物理
复合材料
凝聚态物理
热力学
有机化学
化学
功率(物理)
工程类
物理
作者
Jinfeng Lin,Guanglong Ge,Kun Zhu,Hairui Bai,Baisheng Sa,Fei Yan,Guohui Li,Cheng Shi,Jiwei Zhai,Xiao Wu,Qiwei Zhang
标识
DOI:10.1016/j.cej.2022.136538
摘要
Ceramic-based transparent dielectric materials are regarded as the best candidates for advanced energy storage and conversion materials because of their outstanding optical and electric properties. Nevertheless, due to the presence of low density, low band gap energy and large grain size, it is difficult to simultaneously obtain high energy storage density and high optical transmittance in lead-free based ceramics, which limiting their further development of practical applications. In this work, the relaxor ferroelectric ceramics of x mol% Er3+-doped 0.91 K0.5Na0.5NbO3-0.09BamSrnTiO3 (xEr-SrmBan) were constructed via A-site non-stoichiometric defect engineering. It is worth noting that excessive addition of Sr and Ba, especially Sr, can significantly refine the grain size and domain size on account of vacancy-related defect pinning. Finally, high energy storage density (W = 6.39 J/cm3, Wrec = 3.42 J/cm3) together with high optical transmittance (∼72% at 900 nm) can be achieved simultaneously in 0.25Er-Sr1Ba0.5 due to the exist of dense structure, ultrafine grain size (<100 nm), small-sized nano-microdomains (i.e., PNRs, < 50 nm) and large bandgap energy (∼3.10 eV). Furthermore, a fast discharge time of 42 ns can also be realized. The above results indicate that the present study helps to promote the development of advanced transparent energy storage and conversion materials.
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