聚苯乙烯磺酸盐
材料科学
热电效应
热电材料
离子键合
载流子
佩多:嘘
化学物理
塞贝克系数
导电聚合物
导线
离子电导率
导电体
化学工程
聚合物
凝聚态物理
热导率
离子
热力学
物理化学
复合材料
光电子学
电极
有机化学
化学
电解质
工程类
物理
作者
Ujwala Ail,Mohammad Javad Jafari,Hui Wang,Thomas Ederth,Magnus Berggren,Xavier Crispin
标识
DOI:10.1002/adfm.201601106
摘要
The thermoelectric (TE) phenomena are intensively explored by the scientific community due to the rather inefficient way energy resources are used with a large fraction of energy wasted in the form of heat. Among various materials, mixed ion‐electron conductors (MIEC) are recently being explored as potential thermoelectrics, primarily due to their low thermal conductivity. The combination of electronic and ionic charge carriers in those inorganic or organic materials leads to complex evolution of the thermovoltage ( V oc ) with time, temperature, and/or humidity. One of the most promising organic thermoelectric materials, poly(3,4‐ethyelenedioxythiophene)‐polystyrene sulfonate (PEDOT‐PSS), is an MIEC. A previous study reveals that at high humidity, PEDOT‐PSS undergoes an ionic Seebeck effect due to mobile protons. Yet, this phenomenon is not well understood. In this work, the time dependence of the V oc is studied and its behavior from the contribution of both charge carriers (holes and protons) is explained. The presence of a complex reorganization of the charge carriers promoting an internal electrochemical reaction within the polymer film is identified. Interestingly, it is demonstrated that the time dependence behavior of V oc is a way to distinguish between three classes of polymeric materials: electronic conductor, ionic conductor, and mixed ionic–electronic conductor.
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