Scalable free-standing polypyrrole films for wrist-band type flexible thermoelectric power generator
Scalable free-standing polypyrrole films for wrist-band type flexible thermoelectric power generator
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DOI：
10.1016/j.energy.2019.04.013
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发表时间：
2019-06-01
期刊：
影响因子：
9
通讯作者：
Aswal, D. K.
中科院分区：
文献类型：
--
作者：
Bharti, Meetu;Jha, P.;Aswal, D. K.
以FeCl 3水溶液为氧化剂，对甲苯磺酸（PTSA）为掺杂剂，通过界面化学聚合吡咯（在环己烷中）制备了高度柔性的自支撑聚吡咯薄膜。形貌表征显示合成的薄膜的颗粒状形貌，并建议在其厚度与PTSA浓度的增加而减少。随着掺杂量的增加，聚吡咯薄膜的电导率从4.8S/cm提高到162.7S/cm，而对Seebeck系数（4-8 μ V/K）的影响不大。X射线光电子能谱和电子自旋共振谱（ESR）的组合结果证实了掺杂含量（N+/N含量）的增强，即随着PTSA浓度的增加，电荷载流子如极化子/双极化子的形成。高电导率沿着与中等塞贝克系数的协同组合，在掺杂的自支撑聚吡咯膜导致最高的平均功率因数，类似于0.45 μ W/mK（2）。此外，还设计了一个腕带型热电发电器，通过集成七个独立的聚吡咯薄膜，以显示其潜在的实际热电应用。在80 ℃的温差下，器件的最大开路电压和最大开路电流分别为336 μ V和46 nA。这项工作揭示了开发可穿戴能量收集设备的新途径，这些设备可以使用独立的PPy薄膜进行设计。(C)2019爱思唯尔有限公司版权所有。
Highly flexible free-standing polypyrrole films were prepared by the interfacial chemical polymerization of pyrrole (in cyclohexane) using aqueous FeCl3 as an oxidant and p-toluene sulphonic acid (PTSA) as a dopant. Morphological characterization revealed the granular morphology of the synthesized films and also suggested a reduction in their thickness with the increase in PTSA concentration. The increase of the doping content in these polypyrrole films, also resulted in the enhancement of electrical conductivity from 4.8 S/cm to 162.7 S/cm without much affecting the Seebeck coefficient similar to 4-8 mu V/K. The combined results of X-ray photoelectron spectroscopy and Electron spin resonance spectroscopy (ESR) confirms the enhancement of doping content (N+/N content) i.e. formation of charge carriers such as polarons/ bipolarons with the increase in PTSA concentration. The synergetic combination of high electrical conductivity along with moderate Seebeck coefficient in the doped free-standing PPy films resulted in the highest average power factor of similar to 0.45 mu W/mK(2). A wrist-band type thermoelectric power generator was also designed by integrating seven number of free-standing PPy films to manifest their potential for practical thermoelectric applications. The fabricated device exhibited maximum open-circuit voltage and current respectively as 336 mu V and similar to 46 nA, for a temperature difference of 80 degrees C. The work reveals new avenues towards the development of wearable energy harvesting devices that can be possibly designed using free-standing PPy films. (C) 2019 Elsevier Ltd. All rights reserved.