School of Science, and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen, 518055, P. R. China.
School of Physics, Harbin Institute of Technology, Harbin, 150001, P. R. China.
Small. 2022 Mar;18(10):e2106875. doi: 10.1002/smll.202106875. Epub 2022 Jan 5.
Wearable thermoelectric generators have great potential to be utilized as the power supply for wearable electronics. However, the limited temperature difference across the thermoelectric generators significantly degrades the output performance, which is anticipated to be improved by enhancing the thermal radiation at the cold side without extra energy consumption. In this paper, the impact of thermal radiation on the performance of thermoelectric generators in different environments is simulated and the enhanced performance in a wearable thermoelectric generator combined with a radiative cooling coating is experimentally verified. Compared with the pristine device, the wearable thermoelectric generator with radiative cooling coating can not only achieve an ≈128% improvement of output power in exposed environments, but also exhibit an ≈96% improvement of output power in non-exposed environments. The indoor output performance of the wearable thermoelectric generator with a radiative cooling coating due to its stable voltage output is extensively investigated, which shows an output power density of ≈5.5 μW cm at the indoor temperature of 295 K, doubled that without a radiative cooling coating. This work paves a new way for further enhancing the performance of thermoelectric generators via passive radiative cooling.
可穿戴式热电发生器具有作为可穿戴电子设备的电源的巨大潜力。然而，热电发生器两端的温差有限，极大地降低了输出性能，预计通过增强冷侧的热辐射而无需额外的能量消耗来提高输出性能。在本文中，模拟了热辐射对不同环境下热电发生器性能的影响，并通过实验验证了结合辐射冷却涂层的可穿戴热电发生器的增强性能。与原始器件相比，具有辐射冷却涂层的可穿戴热电发生器不仅可以在暴露环境中实现约 128%的输出功率提升，而且在非暴露环境中也可以实现约 96%的输出功率提升。通过其稳定的电压输出，广泛研究了具有辐射冷却涂层的可穿戴热电发生器的室内输出性能，在室内温度为 295 K 的情况下，输出功率密度约为 5.5 μW cm，是没有辐射冷却涂层时的两倍。这项工作为通过被动辐射冷却进一步提高热电发生器的性能开辟了新途径。
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