High-performance stretchable thermoelectric generator using serpentine interconnects encapsulated in an ultrasoft silicone sponge

Abstract Stretchable thermoelectric generators (S-TEGs) have the potential to utilize waste heat from sources with complex and dynamic surfaces. However, their performances are still lower than those of conventional hard rigid TEGs easily degraded by large or cyclic deformations due electrical failure. An approach that improves both stretchability performance is required. This study presents explores improvements enabled an ultrasoft silicone sponge encapsulation for S-TEGs using silicone-encapsulated serpentine interconnects internal wiring bismuth-telluride-based elements. The characterized a low Young’s modulus (0.01 MPa) thermal conductivity (0.08 W m ?1 K ) owing its open-cell structure. We consider decreases stress in under deformation increases temperature differences elements constant flow conditions. fabricated three different encapsulations: soft silicones, as used previous studies, sponge. experimentally measured elongation cycle number failure evaluation well open-circuit voltage maximum power evaluation. Thus, S-TEG showed highest (125% failure) (1.80 ? cm ?2 per unit area on heater at 100 °C natural air convection). Additionally, 153 water cooling, comparisons existing confirm proposed achieves improved relatively high output power.