The Interfacial Effect on the Open Circuit Voltage of Ionic Thermoelectric Devices with Conducting Polymer Electrodes,Advanced Electronic Materials

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The Interfacial Effect on the Open Circuit Voltage of Ionic Thermoelectric Devices with Conducting Polymer Electrodes
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-09-04 , DOI: 10.1002/aelm.202100506
Saeed Mardi _{1,

2} , Dan Zhao ₁ , Nara Kim ₁ , Ioannis Petsagkourakis ₁ , Klas Tybrandt ₁ , Andrea Reale ₂ , Xavier Crispin ₁

Affiliation

Organic-based energy harvesting devices can contribute to a sustainable solution for the transition to renewable energy sources. The concept of ionic thermoelectrics (iTE) has been recently proposed and motivated by the high values of thermo-voltage in electrolytes. So far, most research has focused on developing new electrolytes with high Seebeck coefficient. Despite the major role of the electrode materials in supercapacitors and batteries, the effect of various electrodes on energy harvesting in iTE devices has not been widely studied. In this work, the conducting polymer poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is investigated as the functional electrodes in iTE supercapacitors. Through investigating the thermo-voltage of iTEs of the same electrolyte with varying composition of PEDOT electrodes, it is identified that the different PSS content greatly affects the overall thermo-induced voltage coefficient, S_eff (i.e., effective thermopower). The permselective polyanion in the electrode causes cation concentration differences at the electrode/electrolyte interface and contributes to an interfacial potential drop that is temperature dependent. As a result, the overall thermo-voltage of the device possesses both an interfacial and a bulk contribution. The findings extend the fundamental understanding of iTE effect with functional electrodes, which could lead a new direction to enhance the heat-to-electricity conversion.

中文翻译：

具有导电聚合物电极的离子热电器件开路电压的界面效应

基于有机的能量收集设备可以为向可再生能源过渡提供可持续的解决方案。离子热电 (iTE) 的概念最近被提出并受到电解质中高值热电压的推动。迄今为止，大多数研究都集中在开发具有高塞贝克系数的新型电解质上。尽管电极材料在超级电容器和电池中发挥着重要作用，但尚未广泛研究各种电极对 iTE 设备能量收集的影响。在这项工作中，导电聚合物聚（3,4-亚乙基二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）被研究作为 iTE 超级电容器中的功能电极。通过研究具有不同 PEDOT 电极成分的相同电解质的 iTE 的热电压，S _eff（即有效热电势）。电极中的选择性渗透聚阴离子导致电极/电解质界面处的阳离子浓度差异，并导致与温度相关的界面电位下降。因此，器件的整体热电压具有界面和体相贡献。这些发现扩展了对功能电极 iTE 效应的基本理解，这可能为增强热电转换带来新的方向。

更新日期：2021-09-04

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