3D Printed Gelatin Methacrylate Hydrogel-Based Wearable Thermoelectric Generators
Journal
Advanced Sustainable Systems
Date Issued
2024-01-01
Author(s)
Abstract
The present study focuses on the utilization of a hydrogel consisting of gelatin methacrylate (GelMA) and polyvinyl alcohol (PVA) as a matrix for hosting the redox couple Fe(CN)63−/4−. The hydrogel exhibits a discernable thermopower (Src) of 3 mV K−1. The beneficial effect of the hydrogel microstructure on the mechanical robustness is demonstrated by small-angle X-ray scattering (SAXS). Moreover, the hydrogel is used to construct a 3D printed thermoelectric generator (TEG) consisting of eight p-type thermoelectric legs, which exhibits commendable thermoelectric properties, including an open-circuit voltage of 64 mV and a power density of 4.0 mW m−2 under a temperature gradient (ΔT) of 2.5 K. These findings demonstrate that 3D printing both enhances the quality of the interface between the hydrogel and electrode and provides a promising method for a more facile TEG fabrication process with the potential for further applications in low-grade waste heat harvesting.
Subjects
3D printing | hydrogel | microstructure | SAXS | thermo-electrochemical cells
Type
journal article