Ajeet Kumar*, Alex Tezcan, Zihe Li, Ruxue Yang, Florian Bouville, Guylaine Poulin-Vittrant, Hamideh Khanbareh, James Roscow, Sylvain Deville and Chris Bowen,
{"title":"用于能量收集的冻铸多孔结构batio3 -聚合物复合材料","authors":"Ajeet Kumar*, Alex Tezcan, Zihe Li, Ruxue Yang, Florian Bouville, Guylaine Poulin-Vittrant, Hamideh Khanbareh, James Roscow, Sylvain Deville and Chris Bowen, ","doi":"10.1021/acsaem.5c01606","DOIUrl":null,"url":null,"abstract":"<p >Porous piezoelectric ceramics exhibit a unique combination of high piezoelectric charge coefficients (<i>d</i><sub><i>ij</i></sub>) 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 BaTiO<sub>3</sub> platelets to fabricate lead-free porous textured BaTiO<sub>3</sub> ceramics with highly aligned porosity. A high degree of alignment of the piezoelectric BaTiO<sub>3</sub> 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 BaTiO<sub>3</sub> ceramics (∼60 vol % porosity, sintered at 1150 °C for 4 h) were infiltrated with polymers (epoxy and polydimethylsiloxane) of contrasting elastic properties. The BaTiO<sub>3</sub>–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 BaTiO<sub>3</sub>–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 BaTiO<sub>3</sub>–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.</p>","PeriodicalId":4,"journal":{"name":"ACS Applied Energy Materials","volume":"8 15","pages":"11437–11446"},"PeriodicalIF":5.5000,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsaem.5c01606","citationCount":"0","resultStr":"{\"title\":\"Freeze-Cast Porous Textured BaTiO3–Polymer Composites for Energy Harvesting Applications\",\"authors\":\"Ajeet Kumar*, Alex Tezcan, Zihe Li, Ruxue Yang, Florian Bouville, Guylaine Poulin-Vittrant, Hamideh Khanbareh, James Roscow, Sylvain Deville and Chris Bowen, \",\"doi\":\"10.1021/acsaem.5c01606\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Porous piezoelectric ceramics exhibit a unique combination of high piezoelectric charge coefficients (<i>d</i><sub><i>ij</i></sub>) 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 BaTiO<sub>3</sub> platelets to fabricate lead-free porous textured BaTiO<sub>3</sub> ceramics with highly aligned porosity. A high degree of alignment of the piezoelectric BaTiO<sub>3</sub> 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 BaTiO<sub>3</sub> ceramics (∼60 vol % porosity, sintered at 1150 °C for 4 h) were infiltrated with polymers (epoxy and polydimethylsiloxane) of contrasting elastic properties. The BaTiO<sub>3</sub>–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 BaTiO<sub>3</sub>–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 BaTiO<sub>3</sub>–epoxy composite was used to fabricate a cantilever structure to demonstrate its energy harvesting and sensing performance. 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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.
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.