Advanced Wearable Thermocells for Body Heat Harvesting
Advanced Wearable Thermocells for Body Heat Harvesting
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DOI：
10.1002/aenm.202002539
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发表时间：
2020-10-01
影响因子：
27.8
通讯作者：
Chen, Jun
中科院分区：
文献类型：
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作者：
Liu, Yuqing;Zhang, Shuai;Chen, Jun
用于收集人体热量的热电化学电池(热电池)可以为可穿戴电子设备提供恒定的功率输出，补充最先进的灵活电力存储和转换解决方案。然而，对可穿戴式热电池的优化还缺乏系统的研究，特别是在器件设计、n型电解液和电极/电解液集成方面。本文通过原位化学交联法制备了一种n型凝胶电解质：聚乙烯醇-氯化铁(2/3)，它具有良好的柔韧性和弹性，并且与三维多孔poly(3，4-ethylenedioxythiophene)/polystyrenesulfonate(PEDOT/PSS)电极具有良好的电解液/电极集成性。集成后的n型电池具有良好的塞贝克系数(0.85mVK-1)和输出电流密度(1.74Am(-2)K(-1))，与优化的p型电池(carboxymethylcellulose-K3/4Fe(CN)(6)electrolyte和3DPEDOT/PSS边功能化石墨烯/碳纳米管电极)(-1.22mVK(-1)和1.85Am(-2K-1))相当。N型和p型电池的同等性能使多达18对p-n电池能够有效串联，组合在一起提供0.34V(增量T=10K)的输出电压。该系列器件被制作成概念验证表带，可以采集人体热量，为超级电容器(高达470 mF)充电，以及照亮绿色发光二极管，展示了实际应用。
Thermoelectrochemical cells (thermocells) designed for harvesting human body heat can provide constant power output for wearable electronics, supplementing state-of-the-art flexible power storage and conversion solutions. However, a systematic investigation into the optimization of wearable thermocells is lacking, especially with regard to device design, n-type electrolytes, and electrode/electrolyte integration. Here, a n-type gel electrolyte: polyvinyl alcohol-FeCl(2/3)with outstanding flexibility and elasticity and exceptional electrolyte/electrode integration into a 3D porous poly(3,4-ethylenedioxythiophene)/polystyrenesulfonate (PEDOT/PSS) electrode, is produced via an in situ chemical crosslinking method. The integrated n-type cell shows excellent seebeck coefficients (0.85 mV K-1) and output current density (1.74 A m(-2)K(-1)) that are comparable with an optimized p-type cell consisting of a carboxymethylcellulose-K3/4Fe(CN)(6)electrolyte with a 3D PEDOT/PSS-edge functionalized graphene/carbon nanotube electrode (-1.22 mV K(-1)and 1.85 A m(-2)K(-1)). The equivalent performance of the n-type and p-type cells enables the effective series connection of up to 18 pairs of p-n cells that combines to give an output voltage of 0.34 V ( increment T = 10 K). This in-series device is fabricated into a proof-of-concept watch strap, which can harvest body heat, charge supercapacitor (up to 470 mF) as well as illuminate a green light emitting diode, demonstrating the practical applications.