Pyroelectric materials are of interest for waste heat utilization and thermal detection. However, the low output current and inefficiency reduces their effectiveness. Here, we utilize the abrupt decrease in polarization of ferroelectric BaTiO₃ materials around Curie temperature to improve the output performance of a pyroelectric nanogenerator. The variation of the polarization leads to a large change in the density of surface free charges, resulting in an increase of pyroelectric current. We have designed a temperature control and recording system to realize direct measurement of the pyroelectric output current. The pyroelectric current, power and energy conversion efficiency of the device near the Curie temperature were measured to be 15.6-fold, 18-fold and 15.8-fold higher than those acquired near room temperature. Moreover, the temperature induced current and charge density enhancement can be applied to detect temperature and temperature change. The responsivity of the self-powered temperature sensor near T_c is 120 nC/cm²∙K, which 4.8 times higher than that near room temperature (25.1 nC/cm²∙K). The results confirmed the ability to exploit a ferroelectric phase transition for pyroelectric performance enhancement.

热释电材料对废热利用和热检测很感兴趣。然而，低输出电流和低效率降低了它们的有效性。_{在这里，我们利用铁电 BaTiO 3}极化的突然降低居里温度附近的材料，以提高热释电纳米发电机的输出性能。极化的变化导致表面自由电荷的密度发生很大变化，从而导致热电流增加。我们设计了温度控制和记录系统，实现了热释电输出电流的直接测量。测得该器件在居里温度附近的热释电电流、功率和能量转换效率比在室温附近获得的高出 15.6 倍、18 倍和 15.8 倍。此外，温度感应电流和电荷密度增强可用于检测温度和温度变化。自供电温度传感器在T _c附近的响应度为 120 nC/cm² ∙K，比接近室温 (25.1 nC/cm ² ∙K) 高 4.8 倍。结果证实了利用铁电相变提高热释电性能的能力。