P-N conversion in thermogalvanic cells induced by thermo-sensitive nanogels for body heat harvesting
P-N conversion in thermogalvanic cells induced by thermo-sensitive nanogels for body heat harvesting
复制标题
用于体热采集的热敏纳米凝胶诱导热原电池中的 P-N 转换
DOI：
10.1016/j.nanoen.2018.12.073
复制
发表时间：
2019-03-01
期刊：
影响因子：
17.6
通讯作者：
Zhou, Jun
中科院分区：
文献类型：
--
作者：
Duan, Jiangjiang;Yu, Boyang;Zhou, Jun
热原电池（TGC）是一种很有前途的直接将热量转化为稳定电力输出的装置。目前，TGC 的实际应用受到有限温差产生的低电压（毫伏级）的严重阻碍。提高电压的一种通用策略是交替串联 n 型和 p 型氧化还原单元。然而，可能的氧化还原物质的数量有限，阻碍了器件串联堆叠的优化。在这项工作中，我们报告了一种新颖的概念，可以实现由聚（N-异丙基丙烯酰胺）（PNIPAM）热敏纳米凝胶诱导的碘化物/三碘化物（I-/I-3(-)）氧化还原对的p-n转换，塞贝克系数从0.71 mV K-1变化到- 1.91 mV K-1。结果证明，纳米凝胶能够在热侧选择性捕获 I-3(-)，然后在冷侧释放 I-3(-)，产生游离 I-3(-) 的浓度梯度，从而导致 p-n 反转。此外，我们设计了一种由交替串联的 I-/I-3(-) 和 I-/I-3(-)/纳米凝胶单元组成的可穿戴设备，利用体热产生约 1 V 的开路电压和约 9 μW 的输出功率。这项工作开发了一种反转氧化还原电对塞贝克效应的新方法，对于扩展 TGC 中可能的氧化还原物质库非常重要。
Thermogalvanic cells (TGC) are promising devices for directly converting heat into a stable electric output. The practical applications of TGCs are presently significantly hindered by the low voltage (millivolt level) generated from a limited temperature difference. One general strategy for improving the voltage is to alternately connect n-type and p-type redox units in series. However, the number of the possible redox species is limited, hindering the optimization of the series stacking of devices. In this work, we report a novel concept that enables p-n conversion for the iodide/triiodide (I-/I-3(-)) redox couple induced by poly (N-isopropylacrylamide) (PNIPAM) thermo-sensitive nanogels, with the Seebeck coefficient changing from 0.71 mV K-1 to - 1.91 mV K-1. The results prove that the nanogels enable selective capture of I-3(-) at the hot side followed by the release of I-3(-) at the cold side, yielding a concentration gradient of the free I-3(-), resulting in the p-n inversion. Furthermore, we designed a wearable device consisting of alternating I-/I-3(-) and I-/I-3(-)/nanogels unites in series that generated the open-circuit voltage of approximately 1 V and output power of approximately 9 mu W by utilizing body heat. This work developed a new method for inverting the Seebeck effect of redox couples and is highly important for extending the library of possible redox species in TGCs.