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Protic ionic liquid-based thermoelectrochemical cells for the harvesting of waste heat.

Published online by Cambridge University Press:  24 May 2013

Theodore J. Abraham ,
Douglas R. MacFarlane ,
Ray H. Baughman ,
Na Li ,
Yongshen Chen  and
Jennifer M. Pringle
Theodore J. Abraham
Affiliation:
ARC Centre of Excellence for Electromaterials Science, School of Chemistry, Monash University, Clayton, Victoria 3800, Australia.
Douglas R. MacFarlane
Affiliation:
ARC Centre of Excellence for Electromaterials Science, School of Chemistry, Monash University, Clayton, Victoria 3800, Australia.
Ray H. Baughman
Affiliation:
University of Texas Dallas, 800 W Campbell Road, Richardson, TX, 75080, U.S.A.
Na Li
Affiliation:
University of Texas Dallas, 800 W Campbell Road, Richardson, TX, 75080, U.S.A. Institute of Polymer Chemistry, Nankai University, Tianjin, 300071, China
Yongshen Chen
Affiliation:
Institute of Polymer Chemistry, Nankai University, Tianjin, 300071, China
Jennifer M. Pringle
Affiliation:
Institute for Frontier Materials, Deakin University, 221 Burwood Highway, Burwood, VIC 3125, Australia.
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Abstract

The ability to efficiently harvest heat as a source of sustainable energy would make a significant contribution to reducing our current reliance on fossil fuels. Waste heat sources, such as those produced in industrial processes or through geothermal activity, are extensive, often continuous, and at present severely underutilised. Thermoelectrochemical cells offer an alternative design to the traditional semiconductor-based thermoelectric devices and offer thepromise of continuous and cheap operation at moderate temperatures, low maintenance and with no carbon emissions. They utilise two electrodes, held at different temperatures, separated by an electrolyte containing a redox couple. It is the temperature dependence of the electrochemical redox potential that generates the potential difference across the device as a result of the appliedtemperature difference. The magnitude of this redox potential temperature dependence is given by the Seebeck coefficient, Se. Until recently, research into thermoelectrochemical cells had primarily focused on aqueous media, predominantly with the Fe(CN)63-/4- redox couple.[1] However, the good thermal and electrochemical stability, non-volatility and non-flammability ofmany ionic liquids make them promising alternative electrolytes for these devices. The use of ionic liquid (IL) electrolytes offers potential advantages that include increased thermoelectrochemical device efficiencies and lifetimes and the ability to utilise low temperature (often “waste”) heat sources in the 100 – 200 °C temperature range.[2] Here we discuss our research into the use of the Fe(CN)63-/4- redox couple in protic IL electrolytes, with different amounts of added water, in a thermoelectrochemical device with platinum and single walled carbon nanotube (SWNT) electrodes.

Keywords

energy generationthermoelectricliquid
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1575: Symposium VV – Materials Applications of Ionic Liquids , 2013 , mrss13-1575-vv04-08
Copyright
Copyright © Materials Research Society 2013 

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