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Quasi-solid-State Electrolytes for Low-Grade Thermal Energy Harvesting using a Cobalt Redox Couple

Version 2 2024-06-03, 20:19
Version 1 2018-06-17, 17:23
journal contribution
posted on 2024-06-03, 20:19 authored by A Taheri, DR MacFarlane, Cristina Pozo-GonzaloCristina Pozo-Gonzalo, Jenny PringleJenny Pringle
Thermoelectrochemical cells, also known as thermocells, are electrochemical devices for the conversion of thermal energy directly into electricity. They are a promising method for harvesting low-grade waste heat from a variety of different natural and manmade sources. The development of solid- or quasi-solid-state electrolytes for thermocells could address the possible leakage problems of liquid electrolytes and make this technology more applicable for wearable devices. Here, we report the gelation of an organic-solvent-based electrolyte system containing a redox couple for application in thermocell technologies. The effect of gelation of the liquid electrolyte, comprising a cobalt bipyridyl redox couple dissolved in 3-methoxypropionitrile (MPN), on the performance of thermocells was investigated. Polyvinylidene difluoride (PVDF) and poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) were used for gelation of the electrolyte, and the influence of the different polymers on the mechanical properties was studied. The Seebeck coefficient and diffusivity of the cobalt redox couple were measured in both liquid and gelled electrolytes, and the effect of gelation on the thermocell performance is reported. Finally, the cell performance was further improved by optimizing the concentration of the redox couple and the separation between the hot and cold electrodes, and the stability of the device over 25 h of operation is demonstrated.

History

Journal

ChemSusChem

Volume

11

Pagination

2788-2796

Location

Germany

ISSN

1864-5631

eISSN

1864-564X

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim

Issue

16

Publisher

WILEY-V C H VERLAG GMBH