Ionic thermoelectricity of salt-free PVA-hydrogel

As polyvinyl alcohol (PVA) hydrogels have shown a high potential as an ionic thermoelectric generator, this paper aims to study the thermoelectric (TE) power of salt-free PVA hydrogel. Ionic thermoelectric performance, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) are measured at different relative humidities. Findings show that salt-free PVA hydrogels can achieve a relatively high Seebeck (9.26 mV K−1) using only surrounding moisture. Hydrogels with low PVA content have a more stable TE output than hydrogels with high PVA content in high relative humidity conditions. Embedded Ni-foam-CNT electrodes stabilize performance, reduce noise, and provide superior capacitance, resistance, and thermoelectric performance over direct drop-casting of CNT on hydrogels. Recommended operating relative humidity (RH) ranges between 40 % and 60 %, while recommended PVA content ranges from 10 % to 15 % mass ratio of PVA in water. The results pave the way for using PVA hydrogels as thermoelectric devices in biocompatible applications.

Keywords

Carbon nanotubes, Ionic thermoelectric, Polyvinyl alcohol (PVA) hydrogels, Relative humidity, Seebeck coefficient, Streaming potential

DOI

10.1016/j.apmt.2024.102240

Citation

Yossef, M, Baniasadi, H, Kallio, T, Perry, M & Puttonen, J 2024, ' Ionic thermoelectricity of salt-free PVA-hydrogel ', Applied Materials Today, vol. 38, 102240 . https://doi.org/10.1016/j.apmt.2024.102240

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https://urn.fi/URN:NBN:fi:aalto-202405223519

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[article-cris] Insinööritieteiden korkeakoulu / ENG

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Ionic thermoelectricity of salt-free PVA-hydrogel

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