Thermally regenerative copper nanoslurry flow battery for heat-to-power conversion with low-grade thermal energy

Sunny Maye, Hubert H. Girault, Pekka Peljo

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Abstract

Low-grade heat (below 200 ℃) is available in vast quantities from industry, or from standard roof-top solar thermal collectors. However, production of electric power from these heat sources is challenging with existing technologies. Thermally regenerative batteries allow both the conversion and the storage of thermal energy into electric power, but they suffer from low operation voltages and low output power. Here, we propose a thermally regenerative nanoslurry flow battery based on copper complexation with acetonitrile in non-aqueous solutions operating at voltages above 1 V. Cu(I) complex can be destabilized by removal of acetonitrile by distillation, leading to production of solid copper nanoparticles and Cu(II) in solution, thereby charging the battery. We demonstrate the electricity production at average power densities of 90 W m−2 and peak-power densities up to 150 W·m−2, and estimate the theoretical efficiency of the full system at 2 %. The results demonstrate a proof-of-concept for harvesting and storage of electricity from low-quality heat.
Original languageEnglish
Pages (from-to)2191-2199
JournalEnergy and Environmental Science
Volume13
Issue number7
Early online date9 Jun 2020
DOIs
Publication statusPublished - 1 Jul 2020
MoE publication typeA1 Journal article-refereed

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