Enhanced thermal energy harvesting performance of a cobalt redox couple in ionic liquid-solvent mixtures

Physical Chemistry Chemical Physics : PCCP
Manoj A LazarJennifer M Pringle

Abstract

Thermoelectrochemical cells are increasingly promising devices for harvesting waste heat, offering an alternative to the traditional semiconductor-based design. Advancement of these devices relies on new redox couple/electrolyte systems and an understanding of the interplay between the different factors that dictate device performance. The Seebeck coefficient (Se) of the redox couple in the electrolyte gives the potential difference achievable for a given temperature gradient across the device. Prior work has shown that a cobalt bipyridyl redox couple in ionic liquids (ILs) displays high Seebeck coefficients, but the thermoelectrochemical cell performance was limited by mass transport. Here we present the Se and thermoelectrochemical power generation performance of the cobalt couple in novel mixed IL/molecular solvent electrolyte systems. The highest power density of 880 mW m(-2), at a ΔT of 70 °C, was achieved with a 3 : 1 (v/v) MPN-[C2mim][B(CN)4] electrolyte combination. The significant power enhancement compared to the single solvent or IL systems results from a combination of superior ionic conductivity and higher diffusion coefficients, shown by electrochemical analysis of the different electrolytes. This is the highest p...Continue Reading

Citations

Aug 12, 2016·ACS Applied Materials & Interfaces·Nicolas E HolubowitchKunlei Liu
May 24, 2017·Chemical Communications : Chem Comm·M F DupontJ M Pringle
Feb 27, 2016·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Anita SosnowskaTomasz Puzyn
Mar 23, 2017·Physical Chemistry Chemical Physics : PCCP·Thomas J SalezSawako Nakamae
Jul 15, 2016·Physical Chemistry Chemical Physics : PCCP·Jeffrey J BlackLeigh Aldous
Oct 17, 2017·Faraday Discussions·Douglas R MacFarlaneJennifer M Pringle
Sep 6, 2018·Physical Chemistry Chemical Physics : PCCP·Kyunggu Kim, Hochun Lee
Dec 6, 2018·Nature Communications·Jiangjiang DuanJun Zhou
Nov 7, 2018·Proceedings of the National Academy of Sciences of the United States of America·Kosala WijeratneXavier Crispin
Sep 22, 2017·Advanced Science·Bin LuoLianzhou Wang
Jun 9, 2021·Scientific Reports·Naura Fakhira AntariksaNobuo Kimizuka

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