Enhanced Ionic Transport in Mixed Ionic-Electronic Thermoelectric Conductors Based on Conductive Polymer Matrix
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Mixed ionic-electronic conductors have attracted significant attention due to the synergy of high conductivity and sustained power output via electron transport, coupled with outstanding thermovoltage through ion diffusion. Various organic and inorganic salts combine with the polymer matrix to synthesize thermoelectric ionic-electronic conductors. The degree of complexation between ions and PEDOT:PSS and the intrinsic properties of the ions serve as key factors in forming ion and electron transport pathways and determining the extent of thermal diffusion within the ionic conductor. Relative humidity and salt concentration were precisely controlled to optimize thermoelectric performance. As a result, various PEDOT-based ionic-electronic conductors generated significant thermovoltage even at low-grade heat through the synergistic contributions of electrons and ions. This suggests a promising strategy for the material design for efficient thermoelectric energy harvesting.