Development of Energization-Regenerative Solid-State Dehumidification Elements based on PEDOT: PSS/PVA Composites and Feasibility Study for Application in Desiccant Air-Conditioning Systems

Tohoku University, 6-6-11-1201 Aza Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, Japan

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Abstract

This study focused on the development of a composite dehumidification material based on polyvinyl alcohol (PVA)-modified poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). PEDOT:PSS is known for its high electrical conductivity, whereas PSS exhibits inherent moisture absorption properties. However, pure PEDOT:PSS films are mechanically fragile and are difficult to use as self- supporting membranes. To address this limitation, PVA was introduced as a structural reinforcement material. Five composite films with different PEDOT:PSS-to-PVA ratios were prepared, and their microstructures, mechanical strengths, electrical conductivities, and dehumidification properties were systematically evaluated. The experimental results identified a composite formulation with a good balance among electrical conductivity, moisture absorption, and structural stability. This lays the foundation for future studies on electrically driven dehumidification and material design.