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Feasibility study of thermal energy harvesting using lead free pyroelectrics

机译：使用无铅热释电收集热能的可行性研究

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摘要

Energy harvesting has significant potential for applications in energizing wireless sensors and charging energy storage devices. To date, one of the most widely investigated materials for mechanical and thermal energy harvesting is lead zirconate titanate (PZT). However, lead has detrimental effects on the environment and on health. Hence, alternative materials are required for this purpose. In this paper, a lead free material, lithium niobate (LNB) is investigated as a potential material for pyroelectric energy harvesting. Although its theoretical pyroelectric properties are lower compared to PZT, it has better properties than other lead free alternatives such as ZnO. In addition, LNB has a high Curie temperature of about 1142 degrees C, which makes it applicable for high temperature energy harvesting, where other pyroelectric ceramics are not suitable. Herein, an energy harvesting and storage system composed of a single crystal LNB and a porous carbon-based super-capacitor was investigated. It is found that with controlled heating and cooling, a single wafer of LNB (75 mm diameter and 0.5 mm thickness) could generate 437.72 nW cm(-3) of power and it could be used to charge a super-capacitor with a charging rate of 2.63 mV (h cm(3))(-1).
机译：能量收集对于为无线传感器供电和为储能设备充电具有巨大的潜力。迄今为止，用于机械能和热能收集的研究最广泛的材料之一是锆钛酸铅（PZT）。但是，铅对环境和健康有不利影响。因此，为此目的需要替代材料。本文研究了无铅材料铌酸锂（LNB）作为热电能量收集的潜在材料。尽管其理论热电性能低于PZT，但其性能优于其他无铅替代品（如ZnO）。此外，LNB的居里温度很高，约为1142摄氏度，这使其适用于高温能量收集，而其他热释电陶瓷则不合适。在本文中，研究了由单晶LNB和多孔碳基超级电容器组成的能量收集和存储系统。发现在受控的加热和冷却条件下，单个LNB晶片（直径75毫米，厚度0.5毫米）可以产生437.72 nW cm（-3）的功率，并且可以用来以充电速率为超级电容器充电2.63 mV（h cm（3））（-1）。

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