Mixed Ionic-Electronic Conducting Hydrogels with Carboxylated Carbon Nanotubes for High Performance Wearable Thermoelectric Harvesters

Chia-Yu Lee; Yen-Ting Lin; Shao-Huan Hong; Chia-Hsin Wang; U-Ser Jeng; Shih-Huang Tung; Cheng-Liang Liu

doi:10.1021/acsami.3c09934

Mixed Ionic-Electronic Conducting Hydrogels with Carboxylated Carbon Nanotubes for High Performance Wearable Thermoelectric Harvesters

ACS Appl Mater Interfaces. 2023 Dec 6;15(48):56072-56083. doi: 10.1021/acsami.3c09934. Epub 2023 Nov 20.

Authors

Chia-Yu Lee¹, Yen-Ting Lin¹, Shao-Huan Hong², Chia-Hsin Wang³, U-Ser Jeng³, Shih-Huang Tung⁴, Cheng-Liang Liu^{1

5}

Affiliations

¹ Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
² Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan.
³ National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.
⁴ Institute of Polymer Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
⁵ Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan.

PMID: 37982689
DOI: 10.1021/acsami.3c09934

Abstract

Mixed ionic-electronic conducting (MIEC) thermoelectric (TE) materials offer higher ionic conductivity and ionic Seebeck coefficient compared to those of purely ionic-conducting TE materials. These characteristics make them suitable for direct use in thermoelectric generators (TEGs) as the charge carriers can be effectively transported from one electrode to the other via the external circuit. In the present study, MIEC hydrogels are fabricated via the chemical cross-linking of polyacrylamide (PAAM) and polydopamine (PDA) to form a double network. In addition, electrically conducting carboxylated carbon nanotubes (CNT-COOH) are dispersed evenly within the hydrogel via sonication and interaction with the PDA. Moreover, the electrical properties of the hydrogel are further improved via the in situ polymerization of polyaniline (PANI). The presence of CNT-COOH facilitates the ionic conductivity and enhances the ionic Seebeck coefficient via ionic-electronic interactions between sodium ions and carboxyl groups on CNT-COOH, which can be observed in X-ray photoelectron spectroscopy results, thereby promoting the charge transport properties. As a result, the optimum device exhibits a remarkable ionic conductivity of 175.3 mS cm^-1 and a high ionic Seebeck coefficient of 18.6 mV K^-1, giving an ionic power factor (PF_i) of 6.06 mW m^-1 K^-2 with a correspondingly impressive ionic figure of merit (ZT_i) of 2.65. These values represent significant achievements within the field of gel-state organic TE materials. Finally, a wearable module is fabricated by embedding the PAAM/PDA/CNT-COOH/PANI hydrogel into a poly(dimethylsiloxane) mold. This configuration yields a high power density of 171.4 mW m^-2, thus highlighting the considerable potential for manufacturing TEGs for wearable devices capable of harnessing waste heat.

Keywords: carbon nanotubes; hydrogel; mixed ionic/electronic conductors; thermoelectric; wearable device.