Journal
CARBON
Volume 86, Issue -, Pages 118-123Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.01.037
Keywords
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Funding
- National Research Foundation of Korea [2014R1A1A4A01008768]
- Civil & Military Technology Cooperation Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013M3C1A9055407]
- National Research Foundation of Korea [2014R1A1A4A01008768] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A tubing-shaped, flexible electrochemical thermal energy harvester (thermocell), which can be wound around various types of waste heat sources, was fabricated. The thermocell utilizes the temperature dependence of the ferri/ferrocyanide (Fe(CN)(6)(3-)/Fe(CN)(6)(4-)) redox potential, providing a thermoelectric coefficient of similar to 1.4 mV/K. A highly porous carbon nanotube (CNT) sheet, which is wrapped onto a thin platinum (Pt) wire, was used as an electrode for the redox reaction. The electrode performance was examined by comparing the output powers from the thermocells using a bare Pt wire and CNT sheet wound electrodes. The CNT sheet electrode showed a higher output power from 8.5 to 15.6 mu W, and the short-circuit current density (j(sc)) was increased similar to 1.8 times compared to that of the Pt wire electrode. The performance of the CNT sheet based thermocell was examined according to the winding number of the CNT sheet, the temperature difference between the two electrodes and the operating temperature. The series connection of the thermocells, to demonstrate the voltage and power scaling, was also examined with an understanding of the primary internal resistance that limits the output electrical power. (C) 2015 Elsevier Ltd. All rights reserved.
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