Thermo-osmotic ionogel enabled high-efficiency harvesting of low-grade heat
Thermo-osmotic ionogel enabled high-efficiency harvesting of low-grade heat
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DOI：
10.1039/d1ta01836a
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发表时间：
2021-06-21
影响因子：
11.9
通讯作者：
Wang, Shiren
中科院分区：
文献类型：
--
作者：
Li, Wei;Liu, Yuchen;Wang, Shiren
尽管几十年的尝试，低效率回收低品位的热量仍然没有得到解决。在这项研究中，我们设计并制造了一种新型的热渗透离子凝胶（TOI）复合材料，通过热诱导离子梯度和选择性离子扩散来回收低品位的热量来发电。TOI复合材料由晶体离子凝胶（聚合物约束LiNO3-3H(2)O）膜、离子选择膜和水凝胶膜组装而成。在90℃的热源下，单一TOI复合材料产生了0.52 V的高开路电压，类似于26 mV K-1的差热电压，峰值功率密度为0.4 W m(-2)，具有开创性的峰值能量转换效率为11.17%。8块这样的TOI复合材料串联起来，显示出3.25伏的开路电压。这种TOI系统还被证明可以收集体温，为LED供电，为可穿戴设备供电开辟了许多机会。
Low efficiency in recovering low-grade heat remains unresolved despite decades of attempts. In this research, we designed and fabricated a novel thermo-osmotic ionogel (TOI) composite to recover low-grade heat to generate electric power through a thermo-induced ion gradient and selective ion diffusion. The TOI composite was assembled with a crystalline ionogel (polymer-confined LiNO3-3H(2)O) film, ion selective membrane, and hydrogel film. With a 90 degrees C heat supply, the single TOI composite produced a high open-circuit voltage of 0.52 V, a differential thermal voltage of similar to 26 mV K-1, a peak power density of 0.4 W m(-2), and a ground-breaking peak energy conversion efficiency of 11.17%. Eight pieces of such a TOI composite were connected in series, demonstrating an open-circuit voltage of 3.25 volts. Such a TOI system was also demonstrated to harvest body temperature for powering a LED, opening numerous opportunities in powering wearable devices.