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首页> 外文期刊>Journal of the Korean Ceramic Society >Effect of uniaxial stress on energy harvesting, storage and electrocaloric performance of BZT ceramics
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Effect of uniaxial stress on energy harvesting, storage and electrocaloric performance of BZT ceramics

机译：单轴向应力对能量收获,存储和electrocaloric BZT的性能陶瓷

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摘要

In this work, a systematic approach of waste (thermal/mechanical) energy harvesting and storage potential is studied in Ba0.85Zr0.15TiO3 (BZT) ceramics. The effect of stress on energy storage density (harvesting/storage) and electrocaloric performance is also studied. For this purpose, polarization-electric field hysteresis loops were recorded at various temperatures and uniaxial compressive stress. The Olsen cycle and electro-mechanical cycle are used for direct waste heat or mechanical energy to electrical energy conversion. A thermal energy-harvesting density of 42 kJ/m(3) per cycle was obtained when the Olsen cycle was operated between 296-343 K and 0.25-1.5 MV/m. The electro-mechanical cycle-based energy harvesting is estimated as 78 kJ/m(3) under the applied stress of 5-160 MPa and the electric field of 0.25-1.5 MV/m. The energy storage density is found as 39 kJ/m(3) at zero stress field and 343 K, which increases to 53 kJ/m(3) under the biased stress of 80 MPa in a wide operating temperature range of 296-328 K. It is observed that the high energy storage is a result of the reduction of the hysteresis loss. The electrocaloric temperature is found as 0.16 K and 0.18 K under the 0 and 80 MPa stress fields, respectively. Overall, the reported findings will enrich our understanding of the stress effect on BZT materials, which offers high performance for energy harvesting and storage-based applications. Moreover, this work can be also helpful in improving the energy storage density and electrocaloric effect via stress confinement.
机译：在这项工作中,系统方法的浪费(热/机械)收获和能量存储在Ba0.85Zr0.15TiO3潜力研究(BZT)陶瓷。(收获/存储)和存储密度electrocaloric性能也进行了研究。这个目的,polarization-electric字段磁滞回路在各种记录温度和单轴压应力。奥尔森周期和机电系统的循环使用直接废热或机械能电能转换。能量采集密度每周期42 kJ / m (3)获得了奥尔森循环操作时在296 - 343 K和0.25 - -1.5 MV / m。机电旋能量收获估计78 kJ / m(3)在应用5 - 160 MPa的压力和电场0.25 - -1.5 MV / m。发现39 kJ / m(3)在零应力场和343年增加到53 kJ / m K(3)有偏见80 MPa的压力在一个宽工作温度296 - 328 K。储能是一个减少的结果磁滞损耗。发现温度为0.16 K和0.18 K下分别为0和80 MPa应力场。总的来说,研究成果将丰富我们的报道对BZT压力影响的理解材料,提供高性能能量收集和基于存储应用程序。此外,这项工作也可以帮助提高储能密度和通过应力约束electrocaloric效应。

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