Thermomechanical Energy Conversion Potential of Lead-Free 0.50Ba(Zr0.2Ti0.8 )O3-0.50(Ba0.7Ca0.3)TiO3 Bulk Ceramics
Thermomechanical Energy Conversion Potential of Lead-Free 0.50Ba(Zr0.2Ti0.8 )O3-0.50(Ba0.7Ca0.3)TiO3 Bulk Ceramics
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DOI：
10.1002/ente.201700416
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发表时间：
2018-05-01
影响因子：
3.8
通讯作者：
Vaish, Rahul
中科院分区：
文献类型：
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作者：
Patel, Satyanarayan;Chauhan, Aditya;Vaish, Rahul
如果使用得当，铁电材料是最有效的浪费(热能/机械能)清除手段之一。当适当的材料与高场驱动(爱立信循环)相结合时，可以获得很大的转换势。然而，浪费能源很少以孤立的形式出现(热或振动)。也明显缺乏能够同时进行热机械能量转换的系统，特别是在低频率范围内。在这方面，提出了一种系统的方法来处理奇异材料系统的能量收集和储能组合的概念。收集了作为温度、单轴压应力和电场的函数的极化-电场滞后曲线。在此基础上，对0.50Ba(Zr0.2Ti0.(8))O-3-0.50(Ba0.7Ca0.3)TiO_3块体无铅铁电材料的偏置和无偏置能量转换势的影响进行了理论评估。热循环(5 Mpa，24-96℃)和机械循环(24℃，5-160 Mpa)的最大能量转换势分别为150和210kJm(-3)。在同时去极化的情况下，性能略有提高，达到220kJm(-3)，尽管个别偏置导致了性能下降。而在高应力(60 Mpa)和高温(90℃)下工作时，储能密度分别提高了100%(80kJm(-3))和50%(60kJm(-3))。结果表明，一种奇异的材料系统可以用于热机械能量转换和车载存储容量的组合。
When employed appropriately, ferroelectric materials present themselves as one of the most efficient means of waste (thermal/mechanical) energy scavenging. A large conversion potential can be obtained when appropriate materials are combined with high-field actuation (Ericsson cycle). However, waste energy rarely presents itself in an isolated form (heat or vibration). There is also a distinct lack of systems capable of simultaneous thermomechanical energy conversion, especially in the low-frequency range. In this regard a systematic approach to the concept of combined energy harvesting and storage potential of a singular material system is presented. Polarization versus electric field hysteresis loops were gathered as a function of temperature, uniaxial compressive stress, and electric field. Thereafter, a theoretical assessment was made to the effect of the biased and unbiased energy conversion potential of 0.50Ba(Zr0.2Ti0.(8))O-3-0.50(Ba0.7Ca0.3)TiO3 bulk lead-free ferroelectric material. Maximum energy conversion potentials of 150 and 210kJm(-3) were obtained for thermal (5MPa, 24-96 degrees C) and mechanical cycles (24 degrees C, 5-160MPa), respectively. A slightly improved performance of 220kJm(-3) was obtained under simultaneous depolarization, despite performance degradation through individual biasing. However, the energy-storage density improved by 100% (80kJm(-3)) and 50% (60kJm(-3)), respectively, when operated under elevated stress (60MPa) and temperature (90 degrees C). Results are indicative of a singular material system that could be used for combined thermomechanical energy conversion and on-board storage capacity.