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Title: Highly Stretchable and Air-Stable PEDOT:PSS/Ionic Liquid Composites for Efficient Organic Thermoelectrics
Authors: Kee, Seyoung 
Kim, Hyunho 
Neophytou, Marios 
Emwas, Abdul Hamid 
Baran, Derya 
Paleti, Sri Harish Kumar 
El Labban, Abdulrahman 
Alshareef, Husam N. 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering;Materials Engineering
Keywords: Deformation;Ionic liquids;Tensile strain;Thermoelectric energy conversion
Issue Date: 14-May-2019
Source: Chemistry of Materials, 2019, vol. 31, no. 9, pp. 3519-3526
Volume: 31
Issue: 9
Start page: 3519
End page: 3526
Journal: Chemistry of Materials 
Abstract: Thermoelectric (TE) generators that are capable of providing sustainable energy conversion under dynamic mechanical stresses have been explored for realizing autonomous wearable electronics. However, finding extremely deformable, efficient, and air-stable TE materials is still a major challenge. Here, we report highly stretchable and efficient organic TE materials from aqueous composites of poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) and ionic liquids (ILs). In this composite, ILs simultaneously enhance the Seebeck coefficient and electrical conductivity of PEDOT:PSS (up to 35 μV K -1 and 538 S cm -1 , respectively) by controlling its oxidation level and nanostructure. Moreover, the resulting fibrous structure with IL-assisted soft domains leads to outstanding mechanical deformability and durability, enabling that the PEDOT:PSS/IL films simply coated on elastomeric substrates maintain the TE functionality under tensile strain (ϵ) up to 70% and repetitive stretching cycles with 30% ϵ without severe degradation in TE performance. Furthermore, we also demonstrate the long-term TE stability of PEDOT:PSS/IL composites maintaining >80% of the initial performance after 10 days under ambient conditions. Our finding proves the potential of this novel composite as a stretchable and air-stable organic TE material.
ISSN: 0897-4756
DOI: 10.1021/acs.chemmater.9b00819
Rights: © American Chemical Society
Type: Article
Affiliation : King Abdullah University of Science and Technology 
Cyprus University of Technology 
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