Simultaneous Realization of Flexibility and Ultrahigh Normalized Power Density in a Heatsink-Free Thermoelectric Generator via Fine Thermal Regulation.
Simultaneous Realization of Flexibility and Ultrahigh Normalized Power Density in a Heatsink-Free Thermoelectric Generator via Fine Thermal Regulation.
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DOI：
10.1021/acsami.1c20367
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发表时间：
2021-12
影响因子：
9.5
通讯作者：
Sijing Zhu;Ying Peng;Jie Gao;Lei Miao;Huajun Lai;Chengyan Liu;Junhao Zhang;Yong Zhang;Shun-fu Zhou;K. Koumoto;T. Zhu
中科院分区：
文献类型：
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作者：
Sijing Zhu;Ying Peng;Jie Gao;Lei Miao;Huajun Lai;Chengyan Liu;Junhao Zhang;Yong Zhang;Shun-fu Zhou;K. Koumoto;T. Zhu
可穿戴热电发电机（w- teg）可以不间断地将人体热量转化为电能，为电子设备供电。然而，热电材料效率低、末端温差小、刚性强以及忽略了侧向传热等问题阻碍了w-TEGs的广泛应用。在这项工作中，我们采用有限元模拟来找到同时实现灵活性和超高归一化功率密度的关键因素。采用超低导热系数（0.03 W/m K）的三聚氰胺泡沫作为封装材料，制备了一种新型的轻量化π型无散热器的W - teg，具有良好的拉伸性、舒适性、可加工性和成本效益。在24℃环境温度下，w-TEG的最大功率密度达到7 μW/cm2（坐）和29 μW/cm2（行走）。在合适的换热条件下（散热器风速为1m /s）， 32对w- teg可产生66 mV电压和60 μW/cm2功率密度。我们的TEG输出性能明显优于以前报道的w-TEG。此外，通过在室温下成功驱动石英表，展示了我们的w-TEG的实用性。
Wearable thermoelectric generators (w-TEGs) can incessantly convert body heat into electricity to power electronics. However, the low efficiency of thermoelectric materials, tiny terminal temperature difference, rigidity, and negligence of lateral heat transfer preclude broad utilization of w-TEGs. In this work, we employ finite element simulation to find the key factors for simultaneous realization of flexibility and ultrahigh normalized power density. Using melamine foam with an ultralow thermal conductivity (0.03 W/m K) as the encapsulation material, a novel lightweight π-type w-TEG with no heatsink and excellent stretchability, comfortability, processability, and cost efficiency has been fabricated. At an ambient temperature of 24 °C, the maximum power density of the w-TEG reached 7 μW/cm2 (sitting) and 29 μW/cm2 (walking). Under suitable heat exchange conditions (heatsink with 1 m/s air velocity), 32 pairs of w-TEGs can generate 66 mV voltage and 60 μW/cm2 power density. The output performance of our TEG is remarkably superior to that of previously reported w-TEGs. Besides, the practicality of our w-TEG was showcased by successfully driving a quartz watch at room temperature.