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Adaptable and Wearable Thermocell Based on Stretchable Hydrogel for Body Heat Harvesting
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-09-06 , DOI: 10.1002/aenm.202201542 Cheng Xu 1, 2, 3 , Yong Sun 2, 3 , Junji Zhang 1 , Wei Xu 2, 3 , He Tian 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-09-06 , DOI: 10.1002/aenm.202201542 Cheng Xu 1, 2, 3 , Yong Sun 2, 3 , Junji Zhang 1 , Wei Xu 2, 3 , He Tian 1
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The application of traditional inorganic thermoelectric materials to wearable energy harvesters has been hindered by the rigid bulkiness, while flexible organic conductive polymers have been long troubled by their intrinsic low thermopower. An ideal solution that possesses the merits of the two thermoelectric materials is desperately needed for practical application. Here it is demonstrated that a polyacrylamide (PAAm)-based ultra-stretchable hydrogel can be selected as a superior candidate matrix for flexible and stretchable thermocells to adapt to the curved surface of the human body and deformation of the ankle. Fe(ClO4)3/Fe(ClO4)2 is selected as n-type ion pair for their comparable thermoelectric performance to K3[Fe(CN)6]/K4[Fe(CN)6]. The p-n pair hydrogel electrolytes show a voltage output of 29 mV and current output of 8.5 Am−2 with an average maximum power density of 0.66 mW K−2 m−2 for each p-n cell (ΔT = 10 K). By integrating with the graphite paper electrode, a body-conformal and portable thermocell device, employing the hydrogel electrolytes, is fabricated and reached a voltage output of 0.16 V with 14 pairs of p-n cells (ΔT = 4.1 K). This commercially-effective blueprint demonstrates the bright future of hydrogel-based ionic thermocell in daily wearable scenarios.
中文翻译：
基于可拉伸水凝胶的适应性和可穿戴热电池用于体热收集
传统无机热电材料在可穿戴能量收集器中的应用一直受到刚性体积的阻碍，而柔性有机导电聚合物长期以来一直受到其固有的低热功率的困扰。实际应用迫切需要一种兼具两种热电材料优点的理想解决方案。此处表明，可以选择基于聚丙烯酰胺（PAAm）的超拉伸水凝胶作为柔性和可拉伸热电池的优良候选基质，以适应人体的弯曲表面和脚踝的变形。Fe(ClO 4 ) 3 /Fe(ClO 4 ) 2被选为 n 型离子对，因为它们的热电性能与 K 3相当[Fe(CN) 6 ]/K 4 [Fe(CN) 6 ]。pn 对水凝胶电解质显示出 29 mV 的电压输出和 8.5 Am -2的电流输出，每个 pn 电池的平均最大功率密度为 0.66 mW K -2 m -2 (Δ T = 10 K)。通过与石墨纸电极集成，制造了一种采用水凝胶电解质的贴体便携式热电池装置，并通过 14 对 pn 电池（ΔT = 4.1 K）达到了 0.16 V 的电压输出。这个具有商业效益的蓝图展示了基于水凝胶的离子热电池在日常可穿戴场景中的光明前景。
更新日期：2022-09-06
中文翻译：
基于可拉伸水凝胶的适应性和可穿戴热电池用于体热收集
传统无机热电材料在可穿戴能量收集器中的应用一直受到刚性体积的阻碍，而柔性有机导电聚合物长期以来一直受到其固有的低热功率的困扰。实际应用迫切需要一种兼具两种热电材料优点的理想解决方案。此处表明，可以选择基于聚丙烯酰胺（PAAm）的超拉伸水凝胶作为柔性和可拉伸热电池的优良候选基质，以适应人体的弯曲表面和脚踝的变形。Fe(ClO 4 ) 3 /Fe(ClO 4 ) 2被选为 n 型离子对，因为它们的热电性能与 K 3相当[Fe(CN) 6 ]/K 4 [Fe(CN) 6 ]。pn 对水凝胶电解质显示出 29 mV 的电压输出和 8.5 Am -2的电流输出，每个 pn 电池的平均最大功率密度为 0.66 mW K -2 m -2 (Δ T = 10 K)。通过与石墨纸电极集成，制造了一种采用水凝胶电解质的贴体便携式热电池装置，并通过 14 对 pn 电池（ΔT = 4.1 K）达到了 0.16 V 的电压输出。这个具有商业效益的蓝图展示了基于水凝胶的离子热电池在日常可穿戴场景中的光明前景。
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