用于能量收集的冻铸多孔结构batio3 -聚合物复合材料

IF 5.5 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Ajeet Kumar*, Alex Tezcan, Zihe Li, Ruxue Yang, Florian Bouville, Guylaine Poulin-Vittrant, Hamideh Khanbareh, James Roscow, Sylvain Deville and Chris Bowen, 
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引用次数: 0

摘要

与致密的压电陶瓷相比,多孔压电陶瓷具有高压电电荷系数(dij)和低介电常数的独特组合,这对于实现高压电传感和能量收集性能是理想的。通过在多孔无铅压电陶瓷基体内诱导晶体织构,同时保持排列的多孔结构,可以进一步增强性能。在这里,我们报告了一种工艺,展示了使用定向冷冻铸造BaTiO3薄片来制造具有高度排列孔隙率的无铅多孔结构BaTiO3陶瓷。利用扫描电镜证实了压电BaTiO3薄片在冻结方向上的高度排列。通过x射线衍射量化了纹理的程度,得到Lotgering因子(LF)为~ 0.37。为了提高机械强度和应变失效的传感和采集应用,多孔的BaTiO3陶瓷(~ 60 vol %孔隙率,在1150°C烧结4小时)中渗透具有对比弹性性能的聚合物(环氧树脂和聚二甲基硅氧烷)。在71.6±3.05 MPa的高破坏应力下,batio3 -环氧复合材料的破坏应变(%)为0.93±0.005,杨氏模量为7.6±0.02 GPa。相比之下,BaTiO3-PDMS复合材料具有柔性性质,杨氏模量较低,为0.015±0.0012 GPa,失效应变(%)较高(>22±1.5)。详细研究了材料的介电性能、极化电场回路和压电性能,并利用极化batio3 -环氧复合材料制作了悬臂结构,以验证其能量收集和传感性能。这项工作表明,定向冷冻铸造可以为传感或能量收集应用产生对齐的多孔和有组织的铁电微观结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Freeze-Cast Porous Textured BaTiO3–Polymer Composites for Energy Harvesting Applications

Porous piezoelectric ceramics exhibit a unique combination of high piezoelectric charge coefficients (dij) and low permittivity compared to their dense counterparts, which is desirable for achieving high piezosensing and energy harvesting performance. A further enhancement in performance can be achieved by inducing crystallographic texturing within the porous lead-free piezoceramic matrix while maintaining the aligned porous structure. Here, we report a process demonstrating the use of directional freeze-casting of BaTiO3 platelets to fabricate lead-free porous textured BaTiO3 ceramics with highly aligned porosity. A high degree of alignment of the piezoelectric BaTiO3 platelets in the freezing direction was confirmed by using scanning electron microscopy. The degree of texturing was quantified by X-ray diffraction, yielding a Lotgering factor (LF) of ∼0.37. To enhance the mechanical strength and strain to failure for sensing and harvesting applications, the porous textured BaTiO3 ceramics (∼60 vol % porosity, sintered at 1150 °C for 4 h) were infiltrated with polymers (epoxy and polydimethylsiloxane) of contrasting elastic properties. The BaTiO3–epoxy composite structure demonstrated a strain (%) to failure of 0.93 ± 0.005 at a high failure stress of 71.6 ± 3.05 MPa, with Young’s modulus of 7.6 ± 0.02 GPa. In contrast, the BaTiO3–PDMS composite had a flexible nature and exhibited a lower Young’s modulus of 0.015 ± 0.0012 GPa and a higher strain (%) to failure (>22 ± 1.5). The dielectric properties, polarization–electric field loops, and piezoelectric properties were examined in detail, and the poled BaTiO3–epoxy composite was used to fabricate a cantilever structure to demonstrate its energy harvesting and sensing performance. This work has shown that directional freeze-casting can produce an aligned porous and textured ferroelectric microstructure for sensing or energy harvesting applications.

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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. 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, engineering, physics, bioscience, and chemistry into important energy applications.
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