Stable Hydrogel Electrolytes for Wearable Ionic Thermoelectric Supercapacitors
발표자
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초록
내용
Giant Seebeck coefficients in electrolytes with soft materials provided an alternative to conventional thermoelectrics (TEs); ionic TE. In contrast to the principle of TE with electron/hole diffusion, ionic TEs produce orders of magnitude higher voltages and are attractive for converting low-grade heat into electricity.
In this study, we designed hydrogel electrolytes for stretchable ionic TEs. The materials achieved an apparent Seebeck coefficient (38.9 mV K-1) and ionic conductivity (3.76 × 10-1 mS cm-1). It deformed up to 1500% and exhibited Young’s modulus similar to human skin. Performance at 250% strain remained above 90% of its original performance.
Finally, the stretchable ionic TE device was implemented, where the electrolyte was sandwiched between stretchable electrodes. The ionic TE device was also thermally charged at approximately 60% strain and exhibited reliable mechanical stability for repetitive 500 cycles of 50% strain.