Ionic thermoelectricity of salt-free PVA-hydrogel

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2024-06
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
Series
Applied Materials Today, Volume 38
Abstract
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.
Description
Keywords
Carbon nanotubes, Ionic thermoelectric, Polyvinyl alcohol (PVA) hydrogels, Relative humidity, Seebeck coefficient, Streaming potential
Other note
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