Sasmal Abhishek, Sen Shrabanee, Devi P Sujatha
Functional Materials and Devices Division, CSIR-Central Glass & Ceramic Research Institute, Kolkata-700032, India.
Soft Matter. 2020 Sep 23;16(36):8492-8505. doi: 10.1039/d0sm01031f.
Bi0.95Ba0.05Fe0.95Zr0.05O3 (BBFZO) nanoparticles were synthesized by a sol-gel technique to develop a filler material with lower leakage current and oxygen vacancies compared to the host BiFeO3. In this work, we report the enhanced dielectric, ferroelectric, energy storage and energy harvesting performance of BBFZO incorporated PVDF composites. 15 wt% BBFZO loaded PVDF (15BBFZO) exhibited improved polarity (F(EA) = 77.42%) compared to neat PVDF (F(EA) = 37.01%). At an applied field of ∼14 kV cm-1 (1 Hz), this film (15BBFZO) exhibited a maximum energy storage density of 151.18 μJ cm-3 (at 1 Hz). Upon repeated human finger tapping, an average open circuit peak to peak a.c. voltage (VOC) ∼ 20 V was obtained from 15BBFZO. A comprehensive study of frequency dependent D-E loops and an extensive study of the effect of electrical poling on the output performance of the developed composite films have been performed. An improvement of the dipolar polarization was established through a frequency dependent D-E loop study of unpoled and poled 15BBFZO and from other experiments. After poling the energy storage density and VOC of 15BBFZO were 154.66 μJ cm-3 (at 1 Hz) and ∼30 V, respectively. After rectification this output electrical signal was able to charge a 10 μF commercial capacitor up to ∼5.5 V. After poling, the energy storage efficiency (η) of 15BBFZO also improved from 52.49% to 67.85% (at 1 Hz). The frequency dependence of the storage efficiency for all the samples has also been extensively investigated here. At 1 kHz, η improved to 93.30% for poled 15BBFZO.
采用溶胶-凝胶技术合成了Bi0.95Ba0.05Fe0.95Zr0.05O3（BBFZO）纳米颗粒，以开发一种与主体BiFeO3相比具有更低漏电流和氧空位的填充材料。在这项工作中，我们报道了掺入BBFZO的PVDF复合材料增强的介电、铁电、储能和能量收集性能。与纯PVDF（F(EA)=37.01%）相比，负载15 wt%BBFZO的PVDF（15BBFZO）表现出更高的极性（F(EA)=77.42%）。在约14 kV cm-1（1 Hz）的外加电场下，该薄膜（15BBFZO）表现出151.18 μJ cm-3的最大储能密度（1 Hz时）。在反复用人手指轻敲时，从15BBFZO获得了平均开路峰峰值交流电压（VOC）约20 V。对频率相关的D-E回线进行了全面研究，并对电场极化对所制备复合薄膜输出性能的影响进行了广泛研究。通过对未极化和极化的15BBFZO进行频率相关的D-E回线研究以及其他实验，确定了偶极极化有所改善。极化后，15BBFZO的储能密度和VOC分别为154.66 μJ cm-3（1 Hz时）和约30 V。经过整流后，该输出电信号能够将一个10 μF的商用电容器充电至约5.5 V。极化后，15BBFZO的储能效率（η）也从52.49%提高到了67.85%（1 Hz时）。这里还广泛研究了所有样品储能效率的频率依赖性。在1 kHz时，极化的15BBFZO的η提高到了93.30%。
