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ACS Applied Materials & Interfaces

ACS Applied Materials & Interfaces

IF: 8.3
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Realization of Hydrogel Electrolytes with High Thermoelectric Properties: Utilization of the Hofmeister Effect

Published:5 December 2024 DOI: 10.1021/acsami.4c18790 PMID: 39636741
Shuanglin Jia,?Wanyu Qian,?Penglu Yu,?Ke Li,?Wenxin Tang,?Mingxuan Li,?Jinle Lan,?Yuan-Hua Lin,?Xiaoping Yang

Abstract

Ionic thermoelectric materials, renowned for their high Seebeck coefficients, are gaining prominence for their potential in harvesting low-grade waste heat. However, the theoretical underpinnings for enhancing the performance of these materials remain underexplored. In this study, the Hoffmeister effect was leveraged to augment the thermoelectric properties of hydrogel-based ionic thermoelectric materials. A series of PAAm-x Zn(CF3SO3)2, PAAm-x ZnSO4, and PAAm-x Zn(ClO4)2 hydrogels were synthesized, using polyacrylamide (PAAm) as the matrix and three distinct zinc salts with varying anion volumes to impart the Hoffmeister effect. Exceptionally, the most cost-effective ZnSO4 yielded the highest ionic Seebeck coefficient among the hydrogels, with PAAm-1 ZnSO4 achieving a remarkable value of -3.72 mV K-1. To elucidate the underlying mechanism, we conducted an innovative analysis correlating the Seebeck coefficient with the zinc ion transfer number. Additionally, the hydrogel materials demonstrated outstanding mechanical properties, including high elongation at break (>1400% at its peak), exceptional resilience (virtually no hysteresis loops), and robust fatigue resistance (overlapping cyclic tensile curves). This work not only advances the understanding of ionic thermoelectric materials but also showcases the potential of hydrogels for practical waste heat recovery applications.

Substances (1)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Acrylamide 79-06-1 C3H5NO 664 suppliers $18.00-$1470.00

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